QCL2000 OEM Low Noise 2 A Quantum Cascade Laser Driver

  • Minimizes linewidth, drift & jitter
  • Low noise - 1.3 µA RMS
  • Ideal for precision chemical sensors
  • Up to 2.0 A QCL current
  • Compliance Voltage up to 20 V *
  • Bandwidth 2 - 3 MHz
  • Maximum Safety includes Current Limit
  • Onboard setpoint and limit controls
  • Remote Power On, Enable, Setpoint
  • Dual supply operation ± 24 V

From: $1,995.00

Bulk Pricing (6 - 14): $1955.00

Contact Factory for High Volume Pricing
Price adjustments will be reflected in the cart. For availability information please contact us. All prices are in US dollars and are subject to change without notice. Prices do not include shipping charges. An additional OEM discount applies on orders over 14 pieces. Contact factory for pricing. If ordering from or shipping to Australia, China, or Hong Kong, please contact your distributor.

These Low Noise QCL Drivers have the lowest current noise density of any commercially available driver. Powering your QCL with this patented(1) driver will enable better performance—at lower cost and in less time—than otherwise possible.

This is the right driver for lasers that require a high-precision and ultra-low noise current source. The 500 mA QCL laser driver exhibits noise performance of 0.5 µA RMS to 100 kHz, and an average current noise density of 1.5 nA / √Hz—the lowest available today.

To help you get the best performance from your QCL driver, Wavelength provides on-line Application and Technical notes:
AN-LD08: Manage Grounding to Minimize Noise with the QCL Drivers
AN-LD09: Troubleshooting Low Noise Systems
TN-LD02: How is Current Noise Measured at Wavelength Electronics


The QCL Driver family is available in four different OEM models so that you can choose the ideal one for your application:

What is the difference between the standard QCL OEM and the QCL OEM(+)?
Often with epi-down configurations of the QCL, the exit lead is attached to the case and it is desirable to ground it. Now, the reverse polarity driver, a current source, is available in the OEM package to address this need:

We can also modify the driver at the factory to suit your particular QCL application.
* For example, the standard maximum compliance voltage is 16 V. For up to 20 V compliance, request Product Variation PV055.
* For higher efficiency operation at ±15 V (compliance voltage of 7 V), request PV066.
* OEM versions — loaded PCBs only — are also available.

For integrated temperature control, the PTC-CH Series temperature controllers can be nested inside the QCL heatsink. Information is available here.

An instrument with an integrated power supply, intuitive touchscreen front panel and remote operation software is also available for benchtop use:


In order to maintain their characteristically tight center linewidths and minimize jitter, quantum cascade lasers must be powered by drivers with exceptionally low current noise density. Our customers have reported achieving narrower linewidths with these drivers than any other they’ve used.


The high modulation bandwidth and fast rise-time maintains modulation waveform integrity so you can shape the laser output profile exactly as your application requires.


The robust design and simple operation of our drivers allows you to take your revolutionary QCL application from the test bench to market quickly and efficiently, using the same driver throughout the entire process. You can focus your efforts on the demanding technical aspects of the system.


All the essential control and monitor functions you expect in a Wavelength laser driver are incorporated into this driver, along with protection circuitry to safeguard your QCL from minor power source faults, over-temperature conditions, and electrical faults. The soft-clamp current limit features a brick-wall never-exceed characteristic that prevents the QCL from being accidentally over-driven and damaged.


Download the brochure to view a more detailed specification chart and learn more about the capabilities of our industry-leading QCL driver.

The datasheet for earlier product revisions (A – C) is available here.


Due to their unique construction, QCLs operate with high power in the near-IR through terahertz ranges. These wavelengths are particularly suited to detection of molecules significant to humans.

Applications for the lower noise QCL driver include: remote detection of explosive materials, medical diagnosis using the breath, non-invasive glucose testing, emissions monitoring of the atmosphere or marine environments, and pharmaceutical process quality control. Additional applications include anesthesia and hospital air quality monitoring, leak detection, remote imaging, and cavity ring-down spectroscopy.

(1)Covered by U.S. Patents 6,696,887; 6,867,644 and 7,176,755.

Free, effective, and responsive technical support is available to simplify integration of Wavelength products into your OEM design. Standard product can be easily modified to meet your application requirements.

Compliance Voltage: 16 V (standard); up to 20 V with factory modification
Long-term Current Stability at ambient 25°C: typically 10 ppm
Temperature Coefficient: typically 10 ppm
RMS noise 1 Hz to 100 kHz: typically 1.3 µA
Average Current Noise Density: 4 nA / √Hz
Noise Characterization Scan: Spectral Noise Scans are available from 1 Hz – 100 kHz. Request at time of purchase.
Competitor Noise Comparison

Package size: 5.5 x 6.55 x 2.3” (140 x 166 x 59 mm)
Dual Supply Voltage: typically ±24 V
Bandwidth: 2 – 3 MHz (CC). Bandwidth will depend on QCL impedance and wire lengths.
Delay: 1.25 sec. After the delay, current will rise to the level dictated by the setpoint voltage.
Current Ramp: 100 msec (to full scale)
Rise / Fall times: 250 nsec (to full scale) / 200 nsec
Remote POWER ON: Power to the controller is ON if this TTL signal is HI (up to 12 V). The POWER is OFF if the input is grounded or high impedance. It is optically isolated.
Remote Enable: The laser current is enabled if this TTL input is HI (up to 12 V). The current is disabled if the input is grounded or high impedance. It is optically isolated.
Quick Connect Wiring Diagram of QCL2000 OEM

qcl standard schematic188


PWRPAK-24VSwitching Power Supply 2 A, 24 V$156
QCLTL-2000QCL Test Load for QCL2000$100
WCB310WCB310 SMA to SMA Cable, 36”, male-to-male$28
WCB311WCB311 QCL 14-pin Connector with Cables$49
WCB312WCB312 QCL Dual Power Supply Wiring Kit$53
WCB313WCB313 QCL Power Cable$49
WCB314WCB314 QCL Load Cable$49
55-110014SMA to BNC Cable$45

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