Abstract

We present a diode-pumped, $2\mathrm{\mu m}$ single-frequency Q-switched $\mathrm{Tm}\text{:}\mathrm{YAG}$ laser. The Q-switched laser is injection seeded by a monolithic $\mathrm{Tm}\text{:}\mathrm{YAG}$ nonplanar ring oscillator with the ramp-hold-fire technique. The output energy of the $2\mathrm{\mu m}$ single-frequency Q-switched pulse is $2.23\mathrm{mJ}$, with a pulse width of $290\mathrm{ns}$ and a repetition rate of $200\mathrm{Hz}$. From the heterodyne beating measurement, the frequency difference between the seed laser and the Q-switched laser is determined to be $37.66\mathrm{MHz}$, with a half-width of the symmetric spectrum of about 2 MHz.

© 2010 Optical Society of America

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