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The ILX Lightwave LDX-3620 is a battery-powered, ultra-low noise laser diode current source optimized for narrow-linewidth and stable-wavelength applications. The instrument provides dual current ranges of 0–200 mA and 0–500 mA with a 4.5-digit LCD display, and it offers constant current or constant power operation, internal or external modulation capability, and a built-in battery charger.
The LDX-3620 is positioned by its manufacturer for laboratory work in coherent communications and atomic spectroscopy, where careful attention to current noise and long-term drift directly affects experimental outcomes. Constant current mode switches out unused circuitry so measured output noise approaches the theoretical limits of the control circuit, while constant power mode uses photocurrent from a back-facet monitor photodiode or front-facet power monitor to hold output power steady. The 4.5-digit display combined with coarse and fine output controls allows precise setting of the drive current.
ValueTronics International has been a specialist source for laser diode instrumentation and precision test equipment since 1992, with every pre-owned LDX-3620 routed through our 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois before it ships. Inventory is held and processed in-house rather than drop-shipped from an unverified third party, which means the unit you order is the unit we have on the shelf, with its condition and accessories documented before quoting.
ILX Lightwave was a Bozeman, Montana-based manufacturer of laser diode instrumentation and test systems. The company and its product lines, including the LDX-3620, were acquired by Newport Corporation; Newport itself became part of MKS Instruments through MKS's acquisition of Newport in 2016. Service and documentation for legacy ILX Lightwave instruments are now associated with the MKS/Newport organization.
| Specification | 0–200 mA Range | 0–500 mA Range |
|---|---|---|
| OUTPUT | ||
| Output Current | 0–200 mA | 0–500 mA |
| Compliance Voltage | >5 V | >4 V |
| Noise and Ripple (5 Hz to 10 MHz bandwidth), Battery operation | <850 nA rms | <2 µA rms |
| Noise and Ripple (5 Hz to 10 MHz bandwidth), AC line operation | <3 µA rms | <8 µA rms |
| Noise and Ripple (5 Hz–10 kHz bandwidth), Battery operation | <100 nA rms | <500 nA rms |
| Noise and Ripple (5 Hz–10 kHz bandwidth), AC line operation | <2 µA rms | <6.5 µA rms |
| Noise Density at 50/60 Hz | 5.2 nA/√Hz | 11.5 nA/√Hz |
| Noise Density at 1 kHz (Battery Operation) | 815 pA/√Hz | 2.6 nA/√Hz |
| Noise Density at 25 kHz (Battery Operation) | 315 pA/√Hz | 795 pA/√Hz |
| Stability, 10–20 seconds | <0.1 ppm | <0.1 ppm |
| Stability, 3–5 minutes | <1 ppm | <1 ppm |
| Stability, 10–30 minutes | <10 ppm | <10 ppm |
| Temperature Coefficient | <10 ppm/°C | <10 ppm/°C |
| Transients | <10 µA | <10 µA |
| Output Connector | Shielded 9-pin D-sub on panel | Shielded 9-pin D-sub on panel |
| CURRENT LIMIT | ||
| Range | 10–500 mA | 10–500 mA |
| Accuracy | ±5 mA | ±5 mA |
| DISPLAY | ||
| Type | 4.5-digit LCD | 4.5-digit LCD |
| Range | 0–199.99 | 0–500.0 |
| Resolution | 0.01 mA | 0.1 mA |
| Accuracy | ±0.05 mA | ±0.6 mA |
| Reads | LASER diode current in mA; MONITOR photodiode current in mA | LASER diode current in mA; MONITOR photodiode current in mA |
| PHOTODIODE FEEDBACK | ||
| Input Type | Current input from external photodiode | Current input from external photodiode |
| Range | 20 µA to 2 mA for full scale output | 20 µA to 2 mA for full scale output |
| Connectors | Rear panel isolated BNC jack or 9-pin rear panel D-sub connector | Rear panel isolated BNC jack or 9-pin rear panel D-sub connector |
| INTERNAL RAMP GENERATOR | ||
| Period | Adjustable 50 ms to 100 s | Adjustable 50 ms to 100 s |
| Span Adjustment | 0–200 / 0–500 mA | 0–200 / 0–500 mA |
| Ramp Trigger | Ramp start trigger output for oscilloscope; optically isolated open collector TTL output | Ramp start trigger output for oscilloscope; optically isolated open collector TTL output |
| Ramp Flyback Time | 700 µs, approximately | 700 µs, approximately |
| EXTERNAL MODULATION INPUT | ||
| Bandwidth (3 dB point), AC Coupled | 100 Hz to 1 MHz | 100 Hz to 1 MHz |
| Bandwidth (3 dB point), DC Coupled | DC to 1 MHz | DC to 1 MHz |
| Transfer Function | 100 mA/V | 250 mA/V |
| Connector | Isolated front panel BNC | Isolated front panel BNC |
| GENERAL | ||
| AC Power Input Voltage Range | 100–125 or 210–250 VAC | 100–125 or 210–250 VAC |
| Line Frequency | 50/60 Hz | 50/60 Hz |
| Battery, +12 volt supply | 4.5 A-hour sealed lead-acid battery (standard) | 4.5 A-hour sealed lead-acid battery (standard) |
| Battery, –12 volt supply | 1.2 A-hour sealed lead-acid battery | 1.2 A-hour sealed lead-acid battery |
| Operating Temperature | 0°C to 40°C | 0°C to 40°C |
| Storage Temperature | –40°C to 70°C | –40°C to 70°C |
| Weight (with extra battery option) | 12 kg (26.4 lbs) | 12 kg (26.4 lbs) |
| Size (H x W x D) | 145 mm x 320 mm x 346 mm (5 5/8" x 12 1/2" x 13 5/8") | 145 mm x 320 mm x 346 mm (5 5/8" x 12 1/2" x 13 5/8") |
Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.
Model No
ILX
Condition
Used
Manufacturer
ILX Lightwave
30+ Years in Business
Secure Payments
Sell Test Equipments
Knowledgeable Staff
On-site Lab
30+ Years in Business
Secure Payments
Sell Test Equipments
Knowledgeable Staff
On-site Lab
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