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.
Abstract：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.
[1] Krupke W F, Beach R J, Kanz V K and Payne S A 2003 Opt. Lett. 28 2336
[2] Zhdanov B V, Shaffer M K and Knize R J 2010 Proc. SPIE 7581 75810F-1
[3] Zweiback J and Komashko A 2011 Proc. SPIE 7915 791509-1
[4] Sulham C V, Perram G P, Wilkinson M P and Hostutler D A 2010 Opt. Commun. 283 4328
[5] Mani S, Rigdon D, Hewett K B and Hostutler D 2010 Proc. SPIE 7686 76860Y-1
[6] Babcock E, Chann B, Nelson I and Walker T 2005 Appl. Opt. 44 3098
[7] Zhdanov B V, Ehrenreich T and Knize R J 2007 Electron. Lett. 43 221
[8] Meng L S, Nizamov B, Madasamy P, Brasseur J K, Henshaw T and Neumann D K 2006 Opt. Express 14 10469
[9] Gourevitch A, Venus G, Smirnov V, Hostutler D A and Glebov L 2008 Opt. Lett. 33 702
2011, Vol. 28 
