Abstract

A diode end-pumped Nd:YAG microlaser passively Q-switched by ${\mathrm{Cr}}^{4+}:\mathrm{YAG}$ with performances controlled by a volume Bragg grating (VBG) output coupler has been developed. Compared with operation at room temperature, the Q-switched laser pulse energy was increased, by a factor of 2 or more, by elevating the Nd:YAG temperature and locking the wavelength of emission with the VBG. Furthermore, the emission wavelength was tuned over $0.7\mathrm{nm}$ bandwidth by changing the VBG temperature while maintaining laser pulses of millijoule-level energy and short (less than $4\mathrm{ns}$) duration.

© 2010 Optical Society of America

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