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Opt Express. 2010 Apr 26;18(9):8937-41. doi: 10.1364/OE.18.008937.

Spectrum narrowing of high power Tm: fiber laser using a volume Bragg grating.

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Institute of Directed Energy Technology, College of Opto-Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China.


Efficient operation of a cladding pumped high power Tm: fiber laser with a volume Bragg grating (VBG) as wavelength selective and spectrally narrowing element is reported. The laser yielded over 112 W of diffraction limited output at 1988 nm with a spectral linewidth of ~12 pm for 279 W of launched pump power, corresponding to a slope efficiency with respect to launched pump power of 43.4%. No discernable difference was observed in terms of output power and slope efficiency when using a broadband highly reflective mirror in place of the VBG.

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