QCL500 OEM(+) Low Noise Quantum Cascade Laser Driver

  • Positive polarity
  • Low noise - 0.5 µA RMS (100 kHz)
  • Ideal for precision chemical sensors
  • Up to 500 mA QCL current
  • Bandwidth 1.5 - 2 MHz
  • Compliance Voltage up to 20 V *
  • Constant Current Mode
  • Maximum Safety includes Current Limit
  • Onboard setpoint and limit controls
  • Dual supply operation ± 24 V

From: $1,696.00

Bulk Pricing (2 - 9): $1573

Contact Factory for OEM 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 9 pieces. Contact factory for pricing. If ordering from or shipping to Australia, China, Hong Kong or Israel please contact your distributor.

The QCL OEM(+) Series drivers use patented1 circuitry to produce the lowest current noise density of any commercially available QCL driver. The 500 mA QCL(+) driver exhibits noise performance of 0.5 µA RMS to 100 kHz, and average current noise density of 1.5 nA / √Hz — the lowest available.

This is the right driver for lasers that require a high-precision and ultra-low noise current source.

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 


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 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.


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


The QCL(+) Series drivers are used in trace element detection systems, both laboratory-based and field deployed. This driver is well suited to applications requiring fast measurement times and ultra high sensitivity, such as 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.

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.

1 Covered by U.S. Patents 6,696,887; 6,867,644 and 7,176,755. Licensed from Battelle Memorial Institute.

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) with Inverter Jumper OUT: typically 0.4 µA (ANALOG IN range -5V to 0V)
RMS noise (1 Hz to 100 kHz) with Inverter Jumper IN: typically 0.5 µA (ANALOG IN range 0V to +5V)
Average Current Noise Density with Inverter Jumper OUT: 1 nA / √Hz
Average Current Noise Density with Inverter Jumper IN: 1.5 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: 1.5 — 2 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: 950 nsec (to full scale) / 1000 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 QCL500 OEM(+)

qcl schematic227


PWRPAK-24VSwitching Power Supply 2 A, 24 V$131
QCLTL-LOQCL Test Load for QCL500 & QCL1000$125
WCB310WCB310 SMA to SMA Cable, 36”, male-to-male$28
WCB311WCB311 QCL 14-pin Connector with Cables$79
WCB312WCB312 QCL Dual Power Supply Wiring Kit$53
WCB313WCB313 QCL Power Cable$12
WCB314WCB314 QCL Load Cable$17
55-110014SMA to BNC Cable$45

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