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We demonstrated a wide CW wavelength tuning range of 18 cm-1 for an epi-up mounted distributed feedback (DFB) quantum cascade laser (QCL) around 4.5 m, via current change. The wavelength tuning coefficient of an epi-up mounted DFB QCL is about 2.2 times of that of an epi-down mounted one. The 3dB modulation bandwidths of an epi-up and an epi-down mounted DFB QCLs are 15 kHz and 400 kHz, respectively.
We report continuous mode-hop free tuning of a sample-grating distributed Bragg reflector (SG-DBR) quantum cascade laser (QCL) operating at 4.55µm wavelength observing N2O features in this range by controlling all three sections of laser namely: front DBR, back DBR and the phase.
We demonstrated 37 cm−1 pulsed wavelength tuning, and 500 mW CW output power at 20 °C and 4.74 μm wavelength with a SMSR of 30 dB, using DBR QCLs unmounted and mounted epi-down, respectively.
We characterized the performance of sampled-grating distributed Bragg reflectors (SG DBR) quantum cascade lasers (QCLs) and demonstrated a wide wavelength tuning from 4.48 to 4.69 μm (100cm−1) by injecting current into the SGDBR sections.
An automatic external-cavity laser system for efficient testing of unmounted quantum cascade laser (QCL) bars has been developed. QCLs emitting at 3.45μm and broadband gain media with ∼344 cm1 tunability at 4.4μm have been studied.
We propose new designs for quantum-cascade lasers integrated with resonant intersubband nonlinearities, which promise ultra-broad spectral tuning and room-temperature operation in the hard-to-reach short-wavelength range gamma ~ 2.5-4 mum.
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