Testing an Integrated Tunable Quantum Cascade Laser Douglas Janssen 1, Halley Cromley 2, Mohammad Islam 3, Fow-Sen Choa 3 1 Greater Grace Christian Academy, 6063 Moravia Park Drive, Baltimore, MD 21206, USA 2 Johns Hopkins University, 3400 N. Charles Street Baltimore, MD 21218, USA 3 University of Maryland Baltimore County, Dept. of CSEE, 1000 Hilltop Circle, Baltimore, MD 21250 email: choa@umbc.edu
Superstructure Grating (SSG) DBR Laser D. Guo; Li, J.-Y.; Cheng, L.; Chen, X.; Worchesky, T.; Choa, F.-S. Widely Tunable Monolithic Mid-Infrared Quantum Cascade Lasers Using Super-Structure Grating Reflectors. Photonics 3(25) 2016. Superstructure grating (SSG) designs are used to create widely tunable lasers with wavelength selectivity achieved by matching SSG modes of the front and rear grating section. For structure comparisons see poster by H. Cromley
SSG-DBR Laser Tuning Methods A B Two tuning methods were employed: For tuning ranges and best method, please visit my poster! Method A: Constant voltage to gain section while varying current to either rear or front grating. Method B: Constant voltage to gain section while supplying current to both rear or front grating; DC bias applied to either front or rear grating.
Key SSG-DBR Test Issues FT-IR Spectrometer: 1. Artifacts caused by FT-IR scan velocity / laser repetition rate mismatch 2. Artifacts caused by interferometer mirror assembly magnet failure
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