Journal
OPTICS EXPRESS
Volume 22, Issue 3, Pages 2656-2664Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.002656
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Funding
- Austrian Science Fund project NEXTLITE [FWF F4909-N23]
- Austrian research funding association (FFG) under the scope of the COMET program within the research network Process Analytical Chemistry (PAC) [825340]
- Austrian Science Fund (FWF) [F 2503] Funding Source: researchfish
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We present the time-resolved comparison of pulsed 2nd order ring cavity surface emitting (RCSE) quantum cascade lasers (QCLs) and pulsed 1st order ridge-type distributed feedback (DFB) QCLs using a step-scan Fourier transform infrared (FT-IR) spectrometer. Laser devices were part of QCL arrays and fabricated from the same laser material. Required grating periods were adjusted to account for the grating order. The stepscan technique provided a spectral resolution of 0.1 cm(-1) and a time resolution of 2 ns. As a result, it was possible to gain information about the tuning behavior and potential mode- hops of the investigated lasers. Different cavity- lengths were compared, including 0.9 mm and 3.2 mm long ridge- type and 0.97 mm (circumference) ring- type cavities. RCSE QCLs were found to have improved emission properties in terms of line-stability, tuning rate and maximum emission time compared to ridge-type lasers. (C)2014 Optical Society of America
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