07
Equipment list: parts, quantities and why
What the Zeeman-EIT bench needs, and the status of each item.
Every item for the Zeeman EIT bench. Quantities for optics and instruments match the 3D reference bench in the simulator (a script checks this). Brands and part numbers are suggestions to start a quotation: confirm availability, 795 nm coatings and specifications with the vendor before ordering. Links go to the vendor, or to a Thorlabs search for the part number.
Laser optionEagleyard BFY12 selected (the current plan). Switch to see rows L01, L03, L05 and L06 for the Yanban RB-795-DFB-BFW.Yanban RB-795-DFB-BFW selected: rows L01, L03, L05 and L06 follow it. Its packaging is pending the supplier reply (PM fibre with a built-in isolator asked, free space listed), so L05 and L06 give both cases.
| # | Look (3D) | Item | Qty | Suggested brand & spec | Why we need it | Link | Status |
|---|---|---|---|---|---|---|---|
| 1 · Laser, isolation and frequency lock | |||||||
| L01 | 795 nm single-frequency DFB laser, PM-fibre pigtailed, with built-in micro-isolator (14-pin butterfly) | 1 pc | Toptica Eagleyard EYP-DFB-0795-00015-1500-BFY12-0005: 5–15 mW from the PM fibre, 0.6–1 MHz linewidth, FC/APC (narrow key), PER 20 dB. Not the BFW11 type, which is a free-space collimated output without a fibre EYP-DFB-0795-00015-1500-BFY12-0005 | The single source for the control, the probe and the SAS reference. A DFB is narrow (~MHz), mode-hop free over its current range and tunes with current/temperature, which is exactly what the lock needs. The fibre pigtail removes the laser-to-fibre alignment, and the micro-isolator inside the module is a first line of defence. Up to 15 mW: do a power budget (isolator, AOM double-pass, polarization optics) before ordering; the vendor can quote a higher-power pigtailed version. | gophotonics.com ↗ | planned | |
| L01 | 795 nm single-frequency DFB laser, 14-pin butterfly, 100 mW class, free-space output (no isolator inside) | 1 pc | Yanban Laser RB-795-DFB-BFW, free-space version: 100–120 mW, linewidth 200 kHz typ (500 kHz max), SMSR ≥ 40 dB, target 794.97 nm, 0.06 nm/°C and 0.004 nm/mA, mode-hop free over 20 GHz, PER 20 dB, 150 mA typ / 175 mA max, NTC 10 kΩ (B 3950); collimated beam about 1.0 × 0.8 mm out of the package, no isolator inside RB-795-DFB-BFW | Same role as the Eagleyard: the single source for the control, the probe and the SAS reference. Ten times the power we need (turn it down with a half-wave plate and a PBS into a dump, or run a lower current), a narrower line, and no obsolescence notice. Mount it in the metal butterfly mount on a heat-sinked aluminium plate (not PETG). Get the test report of the actual unit and run the arrival test (Q&A: the Yanban entry) before building on it. | alibaba.com ↗ | to procure | |
| L02 | 14-pin butterfly laser mount with TEC and thermistor connections | 1 pc | Thorlabs LM14S2 (butterfly mount), matched to the laser pin-out LM14S2 | Holds the butterfly package, makes the electrical connections to the controller and conducts heat. Without a proper mount the TEC cannot stabilize the chip and the wavelength drifts. | Thorlabs search ↗ | to procure | |
| L03 | Laser diode current source + TEC temperature controller with analog modulation input | 1 pc | Thorlabs ITC502 benchtop controller: 0–200 mA laser current (noise < 1.5 µA rms, 10 Hz–10 MHz; compliance > 6 V), TEC ±2 A / 16 W, thermistor input (10 Ω–19.9 kΩ), analog current modulation 20 mA/V with 0–500 kHz bandwidth ITC502 | Drives the DFB with low-noise current and holds its temperature. Its modulation input is the actuator of the frequency lock (the lock box adds a correction to the current) and carries the dither for lock-in detection. Current noise here becomes laser frequency noise (about 1.4 GHz per mA), so < 1.5 µA rms is about 2 MHz. Set its current limit to 170 mA or lower before connecting the laser (maximum rating 170 mA, normal drive 160 mA). The modulation coefficient is 20 mA/V, about 28 GHz per volt: attenuate the lock-box output about 100:1 into the 10 kΩ input. The laser reads about 20 kΩ at 10 °C, so run the chip at 15 °C or warmer to stay inside the thermistor range. | Thorlabs search ↗ | in the lab ↗ | |
| L03 | Laser diode current source + TEC temperature controller with analog modulation input | 1 pc | Thorlabs ITC502 benchtop controller: 0–200 mA laser current (noise < 1.5 µA rms, 10 Hz–10 MHz; compliance > 6 V), TEC ±2 A / 16 W, thermistor ranges 10 Ω–19.99 kΩ and 100 Ω–199.9 kΩ, analog current modulation 20 mA/V with 0–500 kHz bandwidth ITC502 | Drives the DFB with low-noise current and holds its temperature; its modulation input is the actuator of the frequency lock. With this laser the current tuning is about 1.9 GHz per mA, so < 1.5 µA rms is about 3 MHz (common to control and probe). Set the current limit to 175 mA or lower before connecting (maximum 175 mA, typical 150 mA). 20 mA/V is about 38 GHz per volt: attenuate the lock-box output about 130:1 (DIY D6, 120 kΩ). The NTC reads about 20 kΩ at 10 °C: on the 20 kΩ range keep the chip above about 11 °C. | Thorlabs search ↗ | in the lab ↗ | |
| L04 | Digital lock box (error-signal generation + PI/PID servo) | 1 pc | Red Pitaya STEMlab 125-14 running the open-source Linien / PyRPL laser-lock software STEMlab 125-14 | Turns the SAS photodiode signal into an error signal (lock-in at the dither frequency) and closes the loop onto the laser controller. A programmable box is much cheaper than a commercial servo and gives slope-sign, gain and integrator control. Upgrade path: Vescent D2-125. | redpitaya.com ↗ | to procure | |
| L05 | Fibre collimator, FC/APC, f ≈ 11 mm (≈1.5 mm beam) | 1 pc | Thorlabs CFC11A-B (FC/APC, 650–1050 nm). It plugs straight onto the laser's FC/APC fibre and is followed by the free-space isolator (L06): match the APC connector and clock the key for the polarization you want. CFC11A-B | Turns the fibre output into a collimated ~1.5 mm beam, the size the AOM aperture and cell need. A mismatched connector (PC vs APC) damages the ferrule or causes back-reflection into the laser. | Thorlabs search ↗ | planned | |
| L05 | PM-fibre link after the isolators: fibre coupler, PM780 patch cable, output collimator, half-wave plate | 1 set | Coupler: Thorlabs PAF2-5B FiberPort (f 4.6 mm, made for a Ø1 mm beam into a 5 µm mode; the lab owns one). Fibre: PM780 patch cable, FC/APC both ends, 2 m (for example Thorlabs P5-780PM-FC-2). Output: a second PAF2-5B-type FiberPort (about Ø1 mm beam, 1.087 mrad) on the bench side, at the 100 mm beam height. Half-wave plate ؽ″ zero-order in a rotation mount before the coupler, to launch along the slow axis. The two steering mirrors and their mounts are counted in O01 and O02. PAF2-5B + P5-780PM-FC-2 | Our setup (decided 19 Oct 2026): the free-space beam is cleaned by a PM fibre. The output is then the same as a PM-pigtailed laser: a clean round Gaussian of about Ø1 mm (a good size for the AOMs, no reducing telescope needed), polarization fixed by the fibre axis, pointing fixed by the output collimator. Laser-side drift or a laser swap changes only the coupled power, never the alignment of the AOMs, the SAS and the cell. To buy: the patch cable, the second FiberPort and the half-wave plate (the coupler is in the lab). | thorlabs.com ↗ | to procure | |
| L06 | Free-space Faraday optical isolator, 795 nm, single stage (Thorlabs I795P3D) | 1 pc | Thorlabs I795P3D: fixed narrowband, centre 795 nm (operating range 775–815 nm), isolation ≥ 34 dB and transmission 90 % at the centre wavelength, max beam Ø2.7 mm, max 0.7 W. Mounting adapters listed by Thorlabs: H1C, SM1B2, SM087RC(/M). I795P3D | First element after the collimator, with its input polarizer along the fibre's slow axis. It stops reflections from the AOM double-passes and cell windows from re-entering the DFB (even 10⁻⁴ feedback can cause mode hops) and adds to the micro-isolator inside the laser: together about −95 dB or better at the chip (estimate). The ~1.5 mm collimated beam fits the Ø2.7 mm aperture. | thorlabs.com ↗ | to procure | |
| L06 | Free-space Faraday optical isolators, 795 nm: two stages right after the laser window | 2 pc | Thorlabs I795P3D: fixed narrowband, centre 795 nm (775–815 nm), isolation ≥ 34 dB and transmission 90 % at the centre wavelength, max beam Ø2.7 mm, max 0.7 W. Instead of two I795P3D: one Thorlabs IOT-5-780-VLP tandem isolator (55 dB min, 760–800 nm, Ø4.7 mm). I795P3D | The laser has no isolator inside, and its notes warn that a retro-reflected beam can damage the chip. One stage leaves about −67 dB at the chip, at the edge of mode hopping; two stages about −100 dB (estimate). Nothing reflective may stand between the laser and the first stage. Turn each isolator about the beam for maximum transmission (its input polarizer then lies along the laser polarization); the output polarization is at 45°, so a half-wave plate follows. | thorlabs.com ↗ | to procure | |
| 2 · Optics for the two double-pass arms, SAS and cell line (counts match the 3D bench) | |||||||
| O01 | Steering / retro mirror, protected silver, Ø25.4 mm | 13 pc | Thorlabs PF10-03-P01 (protected silver, 450 nm–20 µm), or the catalogue OQAg-25.4 (Ø25.4 × 5 mm, 450–2000 nm, > 95 %; ask flatness, scratch-dig, protected coating, reflectance at 795 nm at 45°). 13 = 11 on the bench (2 master axis, 3 SAS, 2 control, 2 probe, 2 retro) + 2 for the free-space Yanban laser (steering into the PM-fibre coupler; not needed with the fibre-pigtailed Eagleyard). Order 1–2 spares PF10-03-P01 | Fold the beams so the control and probe arms fit the table and arrive at the recombiner together. Two mirrors per beam give the two degrees of freedom needed to walk a beam onto an axis. The two retro mirrors return the diffracted order in each double pass. | Thorlabs search ↗ | planned | |
| O02 | Kinematic mirror mount, Ø1″, 2-axis | 13 pc | Thorlabs KM100 (or KM100T for the retro mirrors). 13 = 11 on the bench + 2 for the Yanban laser's fibre coupling (same count as the mirrors, O01) KM100 | Gives each mirror the fine tilt adjustment for alignment to a fraction of a milliradian. Without it the mirrors cannot be aligned, and the cat’s-eye returns drift when the RF frequency changes. | Thorlabs search ↗ | planned | |
| O03 | Polarizing beamsplitter cube, cage-mounted, 620–1000 nm | 7 pc | Thorlabs CCM1-PBS252/M (1″ cube in a 30 mm cage cube, metric taps; replaces the discontinued CM1-PBS252): Tp:Ts > 1000:1, Rs:Rp about 20:1 to 100:1, Tp > 90 %. Pick-off, splitter, 2 SAS cubes, 2 double-pass separators, recombiner CCM1-PBS252/M | The PBSs route light by polarization: they split control from probe, separate each double-pass output from its input, recombine the arms, and inject/extract the SAS pump. The reference layout needs seven. Use the transmitted port where purity matters (1000:1); the reflected port is only 20:1 to 100:1. Cheaper option: unmounted ½″ cubes in printed PETG holders (DIY Section, part D12). | Thorlabs search ↗ | planned | |
| O04 | Non-polarizing 50:50 beamsplitter cube, cage-mounted, 700–1100 nm | 1 pc | Thorlabs CCM1-BS014/M (30 mm cage cube, metric taps; replaces the discontinued CM1-BS014) CCM1-BS014/M | Divides the SAS beam into a strong pump and a weak probe independent of polarization. | Thorlabs search ↗ | planned | |
| O05 | Zero-order half-wave plate, 780 nm design, ؽ″ | 4 pc | Thorlabs WPH05E-780 (usable at 795 nm). Pick-off ratio, probe/control split, SAS probe, control trim WPH05E-780 | Sets how much light goes to the SAS (~5 %) and the control/probe power ratio (~12 % probe), turns the SAS probe horizontal, and trims the control polarization. Rotating by θ rotates the polarization by 2θ. | Thorlabs search ↗ | planned | |
| O06 | Zero-order quarter-wave plate, 780 nm design, ؽ″ | 4 pc | Thorlabs WPQ05E-780. 2 in the double passes, 2 either side of the cell WPQ05E-780 | In each double pass the plate is crossed twice, turning the returning beam’s polarization by 90° so the PBS can separate it. At the cell, one plate makes σ⁺/σ⁻ for the Λ system and the second returns the light to linear for the Glan–Taylor. | Thorlabs search ↗ | planned | |
| O07 | Rotation mount for waveplates, 360° with vernier | 8 pc | Thorlabs RSP05/M (ؽ″) RSP05/M | Plate angles must be set to a fraction of a degree: the split ratio, circular polarization purity and double-pass return all depend on it. | Thorlabs search ↗ | planned | |
| O08 | Achromatic doublet f = 100 mm (AR 650–1050 nm) | 3 pc | Thorlabs AC254-100-B. 2 cat’s-eye lenses, 1 expander output lens AC254-100-B | The cat’s-eye lens focuses the diffracted beam onto the retro mirror, so a change of RF frequency (which changes the deflection angle) does not walk the returning beam. The third forms the control beam expander. | Thorlabs search ↗ | planned | |
| O09 | Achromatic doublet f = 50 mm (AR 650–1050 nm) | 2 pc | Thorlabs AC254-050-B. Expander input lens, probe collection lens AC254-050-B | With the f = 100 mm lens it expands the control beam ×2 so it overfills the probe in the cell (control intensity sets the EIT width). The second collects the probe onto the small photodiode area. | Thorlabs search ↗ | planned | |
| O10 | Lens mount, Ø1″ | 5 pc | Thorlabs LMR1/M LMR1/M | Holds each lens on a post with a centred, repeatable position. | Thorlabs search ↗ | planned | |
| O11 | Alignment iris, Ø12 mm | 5 pc | Thorlabs ID12/M. 2 master axis, 1 SAS, 1 before and 1 after the cell ID12/M | Define a repeatable beam axis: centre the beam on two irises and every optic between them is on axis. Essential for walking the beams through the double passes and the shield. | Thorlabs search ↗ | planned | |
| O12 | Beam dump / beam trap | 12 pc | Thorlabs BT610 beam trap or anodised blocks (4 AOM 0th orders, 1 Glan reject, 1 SAS pump, 6 PBS leakage ports) BT610 | Absorb every unused beam: undiffracted AOM orders, the control rejected by the Glan–Taylor and the ~0.1 % PBS leakage. Stray 795 nm light is invisible and a hazard, and scatters onto the detector. | Thorlabs search ↗ | to procure | |
| O13 | Neutral-density filter, OD 0.3 and OD 2.0 (absorptive) | 2 pc | Thorlabs NE03A-B (OD 0.3, SAS probe) and NE20A-B (OD 2.0, probe arm) NE03A-B / NE20A-B | Keeps the probe weak (Ω_p ≪ Ω_c) so EIT is not power-broadened, and makes the SAS probe weaker than its pump. | Thorlabs search ↗ | planned | |
| O14 | Filter holder with post | 2 pc | Thorlabs FH2D or FH1 FH2D | Holds the ND filters on the table. | Thorlabs search ↗ | planned | |
| O15 | Glan–Taylor polarizer, 650–1050 nm, extinction ~10⁵ | 1 pc | Thorlabs GT10-B GT10-B | Removes the strong control after the cell far better than a PBS (10⁵ vs 10³), leaving only the probe on the detector. Without it the control leaks onto the photodiode and hides the EIT peak. | Thorlabs search ↗ | to procure | |
| O16 | Rotation mount for the Glan–Taylor | 1 pc | Thorlabs RSP1X15/M or PRM1/M RSP1X15/M | Sets the transmission axis to the probe polarization and to maximum extinction. | Thorlabs search ↗ | to procure | |
| O17 | Acousto-optic modulator, TeO₂, 415–900 nm, 80 MHz, 2 mm aperture | 2 pc | Gooch & Housego AOMO 3080-125 (quote) 3080-125 | One per arm. Each shifts its beam by 2 × f_RF in a double pass, so a few-tens-of-kHz RF difference gives the 70 kHz two-photon offset at 50 mG, and each can switch its beam for storage pulses. The 2 mm aperture takes a collimated beam of up to about 1.5 mm; a smaller beam gives a faster rise time (about 160 ns per mm of beam diameter). G&H outline drawing 97-01598-01 rev D: SMB snap-on RF input (needs an SMB-to-SMA cable to our amplifiers), housing 2.00 × 1.00 × 0.53 in, polarization 90° to the mounting plane, contrast 1000:1, AR coating 442–633 nm on that drawing: ask for the unit to be coated for 795 nm. | gophotonics.com ↗ | planned | |
| 3 · Mounting, table and hardware | |||||||
| M03 | Post + post holder + clamping fork (+ base) set, Ø1/2″ posts | 60 set | Thorlabs TR75/M + PH75/M + CF125 (or BA1S base) TR75/M + PH75/M + CF125 | Every optic sits on a post at the 100 mm beam height, which the magnetic shield and its cradle set. Sets are counted for 55 optics plus spares. | Thorlabs search ↗ | planned | |
| M04 | Mounts for the two AOMs and the Ø25 mm EIT-cell holder (custom or kinematic platforms) | 3 pc | Thorlabs KM200? / machined aluminium plates custom | The AOMs need a tilt-adjustable stage for the Bragg angle; the cell holder keeps the cell, heater and sensor aligned on the axis. | Thorlabs search ↗ | to procure | |
| M05 | Black hardboard enclosure / beam tubes for the beam path | 1 set | Thorlabs TB4 hardboard panels (covers 160 mm high inside for the 100 mm beam, DIY D10) + SM1 beam tubes to the shield end caps and the detector TB4 | Blocks room light and air currents, and contains stray beams (laser safety). | Thorlabs search ↗ | to procure | |
| M06 | Shield cradle: 3D-printed PETG, holds the shield with its axis at the 100 mm beam height (DIY Section D1). No purchase: printed in the lab | 1 pc | Print d1-shield-cradle.stl (base 210 × 90 × 8, two saddles for the Ø68 outer layer, M6 slots on the 25 mm grid); add 1 mm felt pads and two Velcro straps. Files and notes: DIY Section D1 diy-stl/d1-shield-cradle.stl | Holds the 1.3 kg shield level and on the beam axis, touching it only between the outside degaussing groups. Non-magnetic, at room temperature. | ruxxzif89.github.io ↗ | print in the lab | |
| 4 · SAS reference | |||||||
| S01 | Rb reference cell for SAS, quartz Ø19 × 75 mm, natural Rb, no buffer gas, room temperature | 1 pc | Precision Glassblowing stock cell AB-RB-Q-UV-19X75-AW (quartz, 19 mm OD, 75 mm path, natural Rb, no buffer gas, uncoated windows), stock item AB-RB-Q-UV-19X75-AW | Provides the sub-Doppler lines the laser is locked to. The published Zeeman-EIT set-up (DeRose et al. 2023) locks to a room-temperature cell of natural-abundance Rb with no buffer gas and uncoated walls, so no enrichment is needed. A pump crosses it against the weak probe; where they overlap, atoms near zero velocity give a narrow feature on the photodiode. | precisionglassblowing.com ↗ | planned | |
| S02 | Reference cell holder: 3D-printed PETG cradle, two straps and a light cover (DIY Section D11). No purchase: printed in the lab | 1 set | Print from the STL files: sas-cell-cradle.stl (1), sas-cell-strap.stl (2), sas-cell-cover.stl (1), in matte black PETG; add 4 nylon M3 screws and nuts and 1 mm felt pads. Files and steps: DIY Section D11 diy-stl/sas-cell-*.stl | Keeps the SAS cell level and on the axis without stressing the glass, and covers it against room light and draughts (the cell temperature moves the line slightly). The cell is at room temperature and outside the shield, so PETG is suitable. | ruxxzif89.github.io ↗ | print in the lab | |
| 5 · Rb cell, heating, magnetic field and shielding | |||||||
| C01 | Quartz ⁸⁷Rb vapour cell with 10 Torr neon, Ø25 mm, 25 mm vapour path (about 28 mm long with two 1.6 mm windows), uncoated, custom | 1 pc | Precision Glassblowing custom quartz cell with the geometry and fill of the published Zeeman-EIT cell (DeRose et al. 2023, which is Pyrex): Ø25 mm, 25 mm vapour path, enriched ⁸⁷Rb, 10 Torr Ne, windows uncoated. Torch-sealed stem (tip-off) on the side at mid-length, at most 4 mm above the glass and Ø8 at its base: the wrapped cell must slide into the Ø34 bore of the wound solenoid former (DIY D2). Needs a quote: the stock Ø19 × 75 mm cell is only a reference custom (quote) | The EIT medium, copying the published cell to avoid errors: 25 mm path, pure ⁸⁷Rb (no absorption by ⁸⁵Rb) and 10 Torr neon, which slows atoms diffusing out of the beam and gives Zeeman-EIT lines a few kHz wide. The paper runs it at 55-65 °C with a 50 mG field inside a shield that keeps stray fields below 0.2 mG. Price is our estimate for a custom cell until the vendor quotes. | precisionglassblowing.com ↗ | planned | |
| C02 | Polyimide foil heater with Pt100/NTC sensor, non-magnetic bifilar winding, sized for the Ø25 × 25 mm EIT cell | 2 pc | Minco / Omega polyimide heater, about 80 × 25 mm to wrap a Ø25 mm cell; Pt100 sensors KHLV-103/10 | Warms the cell to ~60 °C (OD ≈ 10). Bifilar winding cancels the heater’s own magnetic field, which would otherwise broaden the Zeeman resonance. | omega.com ↗ | planned | |
| C03 | Cell heater assembly, up to 50 °C (alternative) | 1 pc | Thorlabs GCH25 series heater for Ø25 mm cells, in the length variant that matches the cell GCH25-75 | Ready-made option for a Ø25 mm cell; the 50 °C limit gives OD ≈ 4. Use if building the foil heater is delayed (the paper runs 55-65 °C, so the foil heater is the main route). | Thorlabs search ↗ | optional | |
| C04 | Temperature controller for the cell heater | 1 pc | Thorlabs TC300B TC300B | Holds the cell temperature (OD changes steeply with T) and drives the heater from the sensor reading. | Thorlabs search ↗ | planned | |
| C05 | µ-metal magnetic shield, 3 concentric layers, Ø~70 × 250 mm, with end caps: Ø14 beam hole on the axis, Ø12 cable hole 16 mm off the axis (all caps, both ends) | 1 set | MuShield custom cylinder (alternative: Twinleaf MS-1L 4-layer) custom | Zeeman EIT is first-order sensitive to magnetic field (1.4 kHz/mG), so stray fields must be reduced to the mG level. Without it the line is broad, shifted and irreproducible. Critical-path item. | twinleaf.com ↗ | to procure | |
| C06 | Degaussing coil + variable AC supply (variac) | 1 set | Wound from enamelled copper + 1 A variac custom | Demagnetizes the shield after assembly and any time it is knocked; remanent magnetization dominates the residual field otherwise. | Thorlabs search ↗ | to procure | |
| C07 | Solenoid: non-magnetic former + 0.5 mm enamelled copper wire | 1 set | Machined PEEK/Delrin former (about Ø35 mm, to slide over the Ø25 mm cell and its heater) + 1 kg magnet wire custom | Produces the uniform bias field along the beams inside the shield; its field sets the Zeeman splitting and the two-photon resonance. | mcmaster.com ↗ | to procure | |
| C08 | Low-noise DC supply for the solenoid | 1 pc | Rigol DP832A (3-channel). Upgrade path: battery or Keysight E36312A for lower noise DP832A | Powers the solenoid. Current noise appears as two-photon detuning noise, so noise and stability matter. | int.rigol.com ↗ | to procure | |
| C09 | Fluxgate magnetometer (mG resolution) with probe | 1 pc | Stefan Mayer Instruments FLC100 (or Bartington Mag-01H) FLC100 | Measures the residual field inside the shield and calibrates B against solenoid current. It is the only way to know the mG-level field the experiment depends on. A lower-cost listing of the FLC100 (single axis, range ±100 µT, noise below 5 nT peak-to-peak, DC to 1 kHz) was found: check that the seller is genuine, ask for the zero offset and the calibration sheet, and measure the three axes one after another. | stefan-mayer.com ↗ | to procure | |
| 6 · RF chain for the AOMs | |||||||
| R01 | Dual-channel RF synthesizer, 54 MHz–13.6 GHz, shared clock | 1 pc | Windfreak SynthHD (via Saelig) SynthHD | Generates both AOM drive frequencies (80.000 MHz and 79.965 MHz) from one clock, so the RF phase relation (and probe-control beat) is stable and tunable in Hz steps. Fixed VCO drivers cannot do this. | windfreaktech.com ↗ | planned | |
| R02 | RF power amplifier, 5–500 MHz, 29 dB, +33 dBm | 2 pc | Mini-Circuits ZHL-1-2W-S+ (the SMA model of the ZHL-1-2W+) ZHL-1-2W-S+ | Lifts the synthesizer output to the ~+30 dBm an AOM needs for good diffraction efficiency. One per arm. | minicircuits.com ↗ | to procure | |
| R03 | Digital step attenuator, DC–2.4 GHz, 0–31.5 dB (RF level) | 2 pc | Mini-Circuits ZX76-31R5-PN-S+ ZX76-31R5-PN-S+ | Sets the RF level, so the diffraction efficiency, and so each arm’s power, can be adjusted without touching the optics. | minicircuits.com ↗ | to procure | |
| R04 | RF switch, DC–5 GHz, TTL controlled, fast | 2 pc | Mini-Circuits ZASWA-2-50DR+ ZASWA-2-50DR+ | Gates each RF channel in nanoseconds-to-microseconds: slices the probe pulse and switches the control off and on for storage. The attenuator alone is too slow. | minicircuits.com ↗ | to procure | |
| R05 | Linear DC supply +24 V / 3 A for the amplifiers | 1 pc | Rigol DP832A is already bought for the coil: use channel 2/3, or a small bench supply DP832A | The ZHL-1-2W-S+ amplifiers need +24 V. Use a clean linear source to avoid ripple on the RF. The ±5 V and ±3 V rails of the switch and the attenuator come from the DIY bias box (DIY Section, D8). | int.rigol.com ↗ | to procure | |
| R06 | Directional coupler (20 dB) for RF monitoring | 2 pc | Mini-Circuits ZFDC-20-4-S+ (the SMA model of the ZFDC-20-4+, optional) ZFDC-20-4-S+ | Lets you check the RF power and frequency at the AOM on the scope or a spectrum analyzer without breaking the line. | minicircuits.com ↗ | optional | |
| 7 · Detection, timing and measurement electronics | |||||||
| E01 | Dual-channel function / arbitrary waveform generator, burst + sync output | 1 pc | Siglent SDG2042X (40 MHz, 2 ch) SDG2042X | Provides the gate pulses (TTL) for the two RF switches and the sync that triggers the scope. Needed for the pulsed storage sequence. | siglentna.com ↗ | planned | |
| E02 | Digital oscilloscope, 4-channel, ≥ 50 MHz, with probes | 1 pc | Rigol DS1054Z (or Siglent SDS1104X-E) DS1054Z | Records the probe photodiode (CH1) and the lock-box monitor (CH2) while sweeping, triggered by the generator sync. Shows the EIT peak, the error signal and the retrieved pulse. | int.rigol.com ↗ | to procure | |
| E03 | Amplified photodetector, Si, 350–1100 nm, switchable gain | 2 pc | Thorlabs PDA36A2 (probe detector and SAS photodiode) PDA36A2 | Converts the weak probe light (µW) and the SAS signal to volts with adjustable gain and bandwidth. One for the EIT probe, one for the SAS. | Thorlabs search ↗ | to procure | |
| E04 | Low-noise linear ±12 V power supply for the photodiodes | 1 pc | Thorlabs LDS12B (check whether bundled with the PDA36A2) LDS12B | Supply ripple lands directly on the detected probe signal. A linear supply keeps the EIT peak clean. | Thorlabs search ↗ | to procure | |
| E05 | Optical power meter console + Si sensor head | 1 set | Thorlabs PM100D + S120C PM100D + S120C | Measures absolute power at each stage so the split ratios and the control intensity (mW/cm²) are known, not assumed. Also the calibration for the photodiode. | Thorlabs search ↗ | to procure | |
| E06 | Digital multimeter (6½ digit) | 1 pc | Siglent SDM3065X or Keysight 34461A SDM3065X | Checks supply rails, heater and coil currents and cable continuity. | siglentna.com ↗ | to procure | |
| 8 · Cables and adapters | |||||||
| K01 | BNC cable RG58, 1 m | 12 pc | Pomona / any 50 Ω RG58 1 m | Signals: photodiodes → scope/lock box, lock box → laser controller, generator gates and sync. | digikey.com ↗ | to procure | |
| K02 | SMA male–male cable, 50 Ω, 0.5–1 m | 8 pc | Mini-Circuits CBL-1FT-SMSM+ or similar CBL-1FT-SMSM+ | RF chain: synthesizer → switch → attenuator → amplifier → AOM. Low-loss, well-shielded cables avoid pick-up. | minicircuits.com ↗ | to procure | |
| K03 | SMA–BNC adapters, BNC T-pieces, 50 Ω SMA/BNC terminators | 1 kit | Pomona / Mini-Circuits adapter kit adapter kit | Joins the BNC and SMA parts of the chain and terminates unused ports. | digikey.com ↗ | to procure | |
| K04 | Coil and heater leads, twisted pair, cable ties, Velcro | 1 set | Any non-magnetic twisted pair — | Twisting cancels stray field from the solenoid and heater leads. | digikey.com ↗ | to procure | |
| 9 · Optional / shared | |||||||
| X01 | Scanning Fabry–Pérot interferometer with controller | 1 set | Thorlabs SA200-5B + SA201 (≈ 1.5 GHz FSR) SA200-5B | Checks the laser for mode hops and shows the AOM-shifted components; useful for diagnosing the lock. | Thorlabs search ↗ | optional | |
| X02 | Wavemeter (shared instrument) | 1 pc | HighFinesse WS-series or shared WS | Absolute frequency check of the DFB near 795 nm. Borrow rather than buy if possible. | highfinesse.com ↗ | optional | |
| X03 | Spectrum analyzer or RF power meter for the RF chain | 1 pc | Siglent SSA1015X or similar SSA1015X | Verifies the AOM drive frequency, power and spurs. | siglentna.com ↗ | optional | |
Already owned by the lab (working, usable in this bench)
Everything marked “can use” in the Lab Inventory is listed here with the equipment item it covers. These items are owned: they carry no cost and are not part of the costed bill of materials. The list follows the Lab Inventory (including edits saved in this browser).
| Look | Item | Part | Qty | Covers | Role in this bench | Status |
|---|
Costed BOM (project members only)
Prices in MYR with line totals, the owned / borrowed and remove ticks, and a “cheaper alternative found” tick with your own estimated price and product link. The figures are not stored in this page: they are fetched from a private service after you enter the group password.
Laser option Yanban: the costed BOM still prices the Eagleyard laser line (L01) and one isolator. The Yanban price, and the second isolator if it comes as the free-space version, are added when the supplier quote arrives.
Critical-path items
Without the µ-metal shield and solenoid, Zeeman EIT cannot be made narrow or reproducible. Without the laser controller and lock box, the laser cannot be locked (Milestone 1). Schedule these first.