期刊
APPLIED PHYSICS LETTERS
卷 94, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3089570
关键词
distributed feedback lasers; laser beams; quantum cascade lasers; semiconductor lasers; spectroscopy
We present an optimized technique for the measurement of gain and losses of semiconductor lasers. We optically inject the beam of a distributed feedback laser (DFB) inside the cavity of the lasers under study. The DFB laser operates in a pulsed mode and shifts its emission wavelength as a function of time. This frequency chirp creates the Fabry-Perot fringes of the transmitted intensity that contains all the information on the cavity losses. The setup has been validated by a quantitative study of the losses as a function of the injected current, for a quantum cascade laser emitting at 7.6 mu m.
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