期刊
IEEE JOURNAL OF QUANTUM ELECTRONICS
卷 38, 期 5, 页码 486-494出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/3.998621
关键词
external cavity tunable laser; mid-infrared quantum-cascade laser; tunable mid-infrared laser
Wavelength tuning over 120 run for a grating-coupled 5.1-mum quantum-cascade type-l laser was studied for temperature from 80 to 243 K (-30degreesC). Both the Littman-Metcalf and first-order grating direct feedback cavity configurations were used with similar tuning results. The goal is to achieve broad tunability, and the result is a combined grating and temperature tuning of 245 nm, from 5.040 to 5.285 mum. The laser was designed for predominantly single-mode or at most, two-longitudinal mode operation. The instrument-limited laser linewidth was less than the cavity longitudinal mode spacing. Stepping-motor control of the grating allowed 0.4-GHz wavelength increments (35 pm) to be realized with high reproducibility. A current-induced wavelength shift of similar to2-3 GHz was observed, corresponding to an effective refractive index change of similar to10(-3). Analysis indicates that single-mode, continuously tunable operation is feasible with a more optimal device and cavity.
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