Abstract

Thanks to a propagation direction at 50.3° from the $c$ axis in a ${\mathrm{LiYF}}_4\text{:}\mathrm{Nd}$ crystal, we have equalized the emission cross-sections at 1047 and 1053 nm, respectively, for extraordinary and ordinary waves. The double refraction is used to balance the “o” and “e” pumping. Actively $Q$-switching the laser cavity leads to simultaneous pulses with duration less than 10 ns. Frequency conversion to THz radiation was performed through difference frequency mixing in two nonlinear crystals: GaSe and OH1. In the first case, we obtained 132 nW and in the second case we obtained 51 nW THz power at 6.67 kHz repetition rate.

© 2015 Optical Society of America

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