2.70μm emission Er:Cr:YSGG laser with LiNbO3Pockels cell

In this study, an electro-optically Q-switched 2.70 μm emission Er:Cr:YSGG laser with a LiNbO 3 Pockels cell is investigated and compared with a FTIR Q-switched scheme. It can obtain nanosecond pulse at a low voltage of 1.4 kV using a CaF 2 polarizer and a LiNbO 3 crystal with Brewster's angle cut ends. Wavelength generation of 2.70 μm was possible with a Fresnel loss at a rear mirror with a dielectric dichroic coating. The maximum output energy of 21.5 mJ (at 1 Hz repetition rate) was achieved in TEM 21 mode using the output coupler with a reflectivity of 55% at 2.70 μm. The generated maximum pulse energy and pulse width were 13.3 mJ and 159 ns in TEM 00 mode, respectively. The pulse width was shorter than 1.3 μs of the FTIR Q-switched scheme.