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QCL Driver

Photonics Spectra
Oct 2010
ILX LightwaveRequest Info
 
For absorption spectroscopy using quantum cascade lasers (QCLs), ILX Lightwave Corp. has introduced the LDP-3832 pulsed quantum cascade laser driver that provides peak current up to 5 A with a compliance voltage of up to 20 V and adjustable pulse widths from 10 ns to 1 μs, with adjustable duty cycles up to 5%. It includes a precision 500-mA DC current source with a modulation bandwidth >10 kHz for biasing the laser. Careful attention to the design ensures highly repeatable pulse-to-pulse amplitude and pulse width control with fast rise/fall times of <5 ns and overshoot of less than 5%. Laser protection features include redundant hardware and firm-ware current limits, transient protection, floating outputs and safety interlocks. Integrated current and voltage monitors allow precise pulse waveform monitoring.


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GLOSSARY
absorption spectroscopy
Experimental method of measuring the  transmission of a given sample as a function of the wavelength.
pulse width
The interval of duration of a pulse.
quantum cascade laser
A Quantum Cascade Laser (QCL) is a type of semiconductor laser that emits light in the mid- to far-infrared portion of the electromagnetic spectrum. Quantum cascade lasers offer many benefits: They are tunable across the mid-infrared spectrum from 5.5 to 11.0 µm (900 cm-1 to 1800 cm-1); provide a rapid response time; and provide spectral brightness that is significantly brighter than even a synchrotron source. Quantum cascade lasers comprise alternating layers of semiconductor...
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