Improvement of Buried Grating DFB Quantum Cascade Lasers by Small-Angle Tapered Structure
Authors:
- 10 March 2017
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 29 (10) , 783-785
Abstract
Small-angle tapered waveguide structure combining with the sampled grating was adopted to improve the output power and achieve room temperature continuous-wave (CW) operation of buried grating distributed feedback quantum cascade lasers (DFB QCLs). By utilizing the first-order channel of sampled grating, single-mode DFB QCLs at four different wavelengths were fabricated simultaneously. At 298 K, all four devices can emit more than 130 mW optical power in CW operation. Fundamental transverse mode operation with excellent beam quality was preserved.Keywords
Funding Information
- National Basic Research Program of China (2013CB632803, 2013CB632801)
- National Natural Science Foundation of China (61274094, 61435014)
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