High-Efficiency Continuous-Wave Operation of Blue-Green Laser Diodes Based on Nonpolarm-Plane Gallium Nitride

Autor:	Masashi Kubota, Taketoshi Tanaka, Kuniyoshi Okamoto
Rok vydání:	2008
Předmět:	Range (particle radiation) Materials science business.industry Slope efficiency General Engineering General Physics and Astronomy Gallium nitride Electroluminescence Laser law.invention chemistry.chemical_compound Optics chemistry law Optoelectronics Continuous wave business Lasing threshold Diode
Zdroj:	Applied Physics Express. 1:072201
ISSN:	1882-0786 1882-0778
DOI:	10.1143/apex.1.072201
Popis:	We demonstrated nonpolar m-plane GaN-based blue-green laser diodes (LDs) under continuous-wave (cw) operation with a lasing wavelength of 481 nm. A maximum output power of more than 20 mW was achieved, for which the threshold current and the corresponding threshold current density (Jth) were 61 mA and 6.1 kA/cm2, respectively. The value of Jth and the electroluminescence peak wavelength shift until lasing did not change with lasing wavelength in the range from 459 to 481 nm, though the reflectivities of the cavity facets were fixed for each LD. In addition, the slope efficiency increased with increasing lasing wavelength, from 0.37 W/A at 459 nm to 0.49 W/A at 481 nm. This is the remarkable advantages of nonpolar GaN-based material compared to c-plane material for the realization of green LDs.
Databáze:	OpenAIRE
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