Laterally coupled distributed feedback type-I quantum well cascade diode lasers emitting near 3.22 µm.
Appl Opt
; 56(31): H74-H80, 2017 Nov 01.
Article
em En
| MEDLINE
| ID: mdl-29091669
ABSTRACT
The laterally coupled distributed feedback (LC-DFB) GaSb-based type-I quantum well cascade diode lasers using the second- and the sixth-order gratings to stabilize the output spectrum near 3.22 µm were designed and fabricated. The laser heterostructure contained three cascades. The devices were manufactured using a single dry etching step defining the â¼5-µm-wide ridge with â¼5-µm-wide gratings sections adjacent to the ridge sides. The grating coupling coefficients were estimated to be about 1 cm-1. The stability of the single-frequency operation was ensured by alignment of the DFB mode to the relatively wide gain peak. The 2-mm-long second-order LC-DFB lasers generated above 10 mW of continuous-wave (CW) output power at 20°C in epi-side-up configuration and demonstrated power conversion efficiency above 2%. The sixth-order LC-DFB lasers showed lower efficiency but still generated several milliwatts of CW output power. The devices demonstrated a CW current tuning range of about 3.5 nm at the temperature of 20°C.
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01-internacional
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MEDLINE
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En
Ano de publicação:
2017
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Article