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Spectroscopy done on the light emitted by quantum cascade lasers (QCLs) provides only limited information on the optical , thermal, and temporal properties in such a laser. We study such lasers by time domain electric field spectroscopy of sub-picosecond pulse trains propagating through the QCL cavity. This is done by generating broadband mid-infrared pulses by phase matched difference frequency mixing...
The spectral gain profile and modal gain coefficient can be measured by coupling a broadband mid infrared pulses generated by phase matched difference frequency mixing in a 30 mum thick GaSe crystal . This enables us to detect the transmitted light by coherent detection facilitating the electro optic effect in a crystal. The advantage of time resolved spectroscopy enables easy access to dynamic parameters...
Photoconductive Terahertz emitters with integrated Bragg mirrors are presented which show increased THz emission efficiency due to cavity enhanced absorption. These emitters also allow intracavity THz generation in mode-locked Ti:sapphire lasers.
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