Chinese Optics Letters, 2013, 11 (12): 121401, Published Online: Nov. 6, 2013
Tapered Bragg reflection waveguide edge emitting lasers with near circular twin-beam emission Download: 697次
140.5960 Semiconductor lasers 230.1480 Bragg reflectors 140.3295 Laser beam characterization 230.7370 Waveguides
Abstract
An edge emitting laser with two symmetrical near-circular spots located far field (FF) is demonstrated using tapered double-sided Bragg reflection waveguides (BRWs). The BRWs consist of six pairs of top p-type and bottom n-type Al0.1 Ga0.9 As/Al0.3 Ga0.7As Bragg reflectors with a period thickness of 850 nm. The device has a 4o tapered angle configuration and exhibits two stable circular beams with a separation angle of 52o. Typical FF angles of 5.87o and 7.8o in the lateral and vertical directions, respectively, are achieved. The lateral FF angle in the ridged section is independent of the injection current (>0.8 A) because of narrow ridge (~10 \mu m) confinement. By contrast, the FF angle in the tapered section shows an increase rate of 1.2–1.66o/A. The periodic modulation of the lasing wavelength is observed to be sensitive to self-heating effects.
Ye Yang, Cunzhu Tong, Lijie Wang, Yugang Zeng, Junsheng Cao, Biao Wang, Lijun Wang. Tapered Bragg reflection waveguide edge emitting lasers with near circular twin-beam emission[J]. Chinese Optics Letters, 2013, 11(12): 121401.