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What impedance does a QCL show?

April 26, 2017impedance qcl

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What impedance does a QCL show?

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The impedance of a QCL depends strongly on the wavelength it is designed for, the temperature and the mode it is operated, therefore only rough indications can be given here (consult the datasheet of a particular laser for exact behaviour). Pulsed mode devices have an impedance in the region of 5..50ohm up to about half the threshold current, then it decreases to the region of 0.5..5ohm. When operated at too high current, the impedance can rise again (a condition to be avoided in any case).