QCL1500 Laboratory Series 1.5 A QCL Driver Instrument

  • Output current of 1.5 A
  • Low noise: <1.0 μA RMS up to 100 kHz
  • Adjustable compliance voltage: up to 20 V
  • Analog modulation up to 2-3 MHz
  • Constant Current Mode Operation
  • Intuitive touchscreen user interface
  • USB, Ethernet interfaces with software
  • Store data on computer or flash drive
  • 19" Rack mountable: 2 U and 1/2 rack
  • Maximum safety features for your QCL

From: $3,778.00

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.

These low noise QCL driver instruments have the lowest current noise density of any commercially available. They enable lower detection thresholds in gas, liquid, and material sensing systems. Powering a QCL with Wavelength’s patented1 driver gives you narrower linewidths, stable center wavelength, and repeatable scans.

This is the right instrument for lasers that require a high-precision and ultra-low noise current source to measure concentrations lower than ever before. The 1.5 A QCL driver exhibits noise performance of 1.0 μA RMS to 100 kHz, and an average current noise density of 3 nA / √Hz. 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 instrument models so that you can choose the ideal one for your application:


In order to maintain a characteristically tight center linewidth 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 our QCL 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.


With Wavelength’s plug and play instrument, controls are set quickly using either the instrument touchscreen or a remote computer, and results are easy to monitor. This allows taking your revolutionary QCL application from the test bench to market quickly and efficiently.

A LabVIEW Virtual Instrument application is available for remote operation. Complete installation and operation instructions can be found in the Virtual Instrument Operating Guide.

Remote operation is also possible using the USB and Ethernet Test and Measurement Class Command Set. Complete installation and operation instructions can be found in the LAB Series Command Set document. If you are using the QCL LAB with firmware version 0.79 or earlier, it is remotely controlled using Wavelength’s QuickConnect Application (QCA):

You can upgrade the firmware for free to use the Command Set or VI here. If you are upgrading from version 0.79 to version 1.5+, all calibration and user data will be converted and saved. If you downgrade from version 1.5+ to version 0.79, all existing calibration data will be lost.


All the essential control and monitor functions expected in a Wavelength product are incorporated into this QCL driver, along with protection circuitry to safeguard the QCL from minor power source faults, over-temperature conditions, and electrical faults.

The soft-clamping current limit can be set without enabling the driver output, and uses a brick-wall never-exceed limit circuit to protect the QCL from potentially damaging overcurrent situations. Additionally, the QCL instrument comes standard with many other safety features:

  • Power supply over current protection
  • Brown-out and overvoltage protection
  • Driver over-temperature protection circuit
  • Relay shorts output when current is disabled
  • AC input and patented power supply filtering
  • Key switch, active, and passive interlocks
  • Password protection available to lock out a selectable control set.
  • 2 second turn-on delay
  • 1.5 msec current ramp

An Interlock Kit, which includes a BNC terminator and modified D-SUB connector to override interlocks, is included with the instrument. Single and dual rack mount kits are available. Windows-based software also comes with the instrument.

A rack mount temperature control instrument, the TC LAB Series, is available:
TC10 LAB 10A Controller
TC15 LAB 15A Controller


Once you have finalized your work, the QCL circuitry is available in compact OEM versions:


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.

1Covered 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.

Dimensions: 3.5 x 8.8 x 17.7 inches (89 x 221 x 450 mm)
Supply Range: 115 / 230 ±15% VAC, Switch selectable: 110-120 V and 220-240 V
Output Current: 1.5 A
Compliance Voltage: up to 20 V (The unit will only deliver the voltage that the load requires, up to the compliance voltage limit.)
Long-term Current Stability at ambient 25°C: typically 10 ppm
Temperature Coefficient: typically 10 ppm
RMS noise 1 Hz to 100 kHz: typically 1.0 µA
Competitor Noise Comparison
Average Current Noise Density: 3 nA / √Hzhttps://www.teamwavelength.com/downloads/general/qclnoise.pdf
Noise Characterization Scan: Spectral Noise Scans are available from 1 Hz – 100 kHz. Request at time of purchase.
Bandwidth: 2 – 3 MHz (CC). Bandwidth will depend on QCL impedance and wire lengths.
Rise / Fall times: 250 nsec (to full scale) / 200 nsec

QCL Instrument Specification Comparison Chart

* Citations for the QCL Series:

Quick Start Wiring Diagram
qcl lab wiring220

Instrument Control Screen
control screen218

Instrument Limit Screen
limit screen218

LabVIEW Virtual Instrument Settings & Monitor Screen

LabVIEW Virtual Instrument VI Scan Screen – Scan of Resistive Test Load
vi scan218


QCLTL-1500QCL Test Load for QCL1500$150
INTLK REPL KITQCL Lab Series Interlock Replacement Kit$35
RCKMT-LABSNGLLaboratory Series Single Unit Instrument Rack Mount Kit$129
RCKMT-LABDUALLaboratory Series Dual Unit Instrument Rack Mount Kit$129
55-110014SMA to BNC Cable$45
55-1100153-foot Male-Male USB Cable$19
WCB310WCB310 SMA to SMA Cable, 36”, male-to-male$28

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