Koheron QCL100 is a high-performance current source designed to drive Quantum Cascade Lasers. With a low current noise of 650 pA/√Hz, the QCL100 driver provides an adjustable compliance voltage up to 15 V at 500 mA and an adjustable precision current limit. The QCL100 driver features a 5 MHz modulation input and a 10 Hz trimming input and is supplied from a single 24 V input.
|Laser current||0 - 650 mA|
|Supply voltage VS||19 V - 26 V|
|Compliance voltage||15 V at 500 mA (13.5 V at 650 mA)|
|3 db modulation bandwidth||5 MHz|
|Current monitor gain||2 V/A|
|RMS noise (10 Hz - 1 MHz)||680 nArms|
|Current noise density (1 kHz)||650 pA/√Hz|
|Modulation gains||10 mA/V, 50 mA/V|
|Operating temperature||0 °C - 50 °C|
|Outside Dimensions||100 mm x 68 mm x 16 mm|
|Compatible lasers||Anode-grounded / Floating diode|
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Current noise is measured across a 25 Ω resistor (VSET set to -13.9 V). Integrated noise in the 10 Hz - 1 MHz bandwidth is 653 nArms.
The modulation transfer function of the QCL100 driver was measured across a 25 Ω load at 400 mA (VSET set to -14.5 V) with a modulation input amplitude is 2 Vpp:
The gain at half the optical bandwidth is 6.9 MHz (in low gain) and 5.9 MHz (in high gain). A phase-shift of 90° is reached at 2.6 MHz (in low gain) and 2.3 MHz (in high gain).
The figure below shows the response (yellow) of the QCL100 driver to a 2 Vpp triangle modulation (green):
The QCL100 driver integrates a fast and precise current limit. Here the current limit clamps a 10 kHz sine wave at 400 mA:
External setpoint trimming input
The external trimming input can be use to perform a low frequency modulation with a 10 Hz bandwidth.