Journal
OPTICS EXPRESS
Volume 17, Issue 21, Pages 18900-18905Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.018900
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Funding
- National Research Projects of China [60525406, 60736031, 60806018, 60906026, 2006CB604903, 2007AA03Z446, 2009AA03Z403]
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We demonstrate the fabrication and characterization of photonic-crystal distributed-feedback quantum cascade laser emitting at 4.7 mu m. The tilted rectangular-lattice PCDFB structure was defined using a multi-exposure of two-beam holographic lithography. The devices exhibit the near-diffraction-limited beam emission with the full width at half maximum of the far-field divergence angles about 4.5 degrees and 2.5 degrees for stripe widths of 55 mu m and 95 mu m, respectively. Single-mode emission with a side mode suppression ratio of approximate to 20 dB is achieved in the temperature range (80-210 K). The single-facet output power is above 1 W for a 95 mu m x 2.5 mm laser bar at 85 K in pulsed operation. (C) 2009 Optical Society of America
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