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Quantum cascade laser driver

PRODUCTS > PHOTONICS > LASER DRIVERS > QUANTUM CASCADE LASER DRIVER
QCL100 - Quantum cascade laser driver
QCL100 - Quantum cascade laser driver QCL100 - Current noise QCL100 - Modulation bandwidth

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.

795 €

QCL100-A-500

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Specifications

QCL100-A-500
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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Characterization

Current noise

QCL100 Quantum Cascade Laser driver current noise measurement

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.

Modulation

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:

QCL100 Quantum Cascade Laser driver temperature coefficient

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):

QCL100 Quantum Cascade Laser driver large signal triangular modulation

Current limit

The QCL100 driver integrates a fast and precise current limit. Here the current limit clamps a 10 kHz sine wave at 400 mA:

QCL100 Quantum Cascade Laser driver current limit

External setpoint trimming input

The external trimming input can be use to perform a low frequency modulation with a 10 Hz bandwidth.

QCL100 Quantum Cascade Laser driver external setpoint modulation

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