Abstract
Since their first demonstration in 2012[1], mid-IR QCL combs have been produced which are spectrally broad (> 100 cm-1) and powerful (> 1W). Such compact, monolithic sources would be ideal for high-intensity, short pulse-generation in the mid-infrared. However, the very mechanism responsible for the efficient, broadband four-wave mixing, the sub-ps upper-state lifetime, is that very same mechanism which precludes direct pulse generation internally. Instead, such lasers output a continuous wave periodic FM waveform[1,2]. This has been confirmed by measurements, which indicate a largely parabolic phase profile, translating in the time domain as a periodic sweep in frequency of the comb bandwidth[3]. From the perspective of an external compensation scheme, it is also interesting that the phase is stable[4] and reproducible when the laser power is cycled, and which in total implies that a relatively simple, fixed compressor can be used to correct the field dispersion to the first order.
© 2019 IEEE
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