摘要
The spectral linewidth of a 64-emitter laser-diode array is effectively suppressed by using a volume Bragg grating(VBG)based external cavity.At a maximal driven current of 90 A,the device produces a cw output of 80W with 1.2 W/A slope efficiency and 0.1 nm spectral linewidth(FWHM)centered at 780 nm.The power extraction efficiency reaches 90%as compared with the free running case.The central wavelength of the narrowed spectrum is tuned over a 0.3 nm range by adjusting the VBG's temperature.The absorption of 45%laser radiation by a 5-mm-long rubidium vapor cell with 150 Torr ethane and 450 Torr helium at 383 K is demonstrated.
