A beta barium borate (β-BaB2O4 or BBO) crystal has been used to electro-optically Q switch both diode-pumped and lamp-pumped Nd:YLF laser systems, resulting in stable, high average power operation. Piezoelectric ringing was found to have negligible effects on the performance of the BBO Pockels cell at repetition rates up to 6 kHz. The high damage threshold and low insertion loss of BBO permitted operation up to average powers in excess of 6 kW/cm2, which makes a BBO Pockels cell well suited for high power, small mode volume operation, such as in diode-pumped solid state lasers. Based on typical diode-pumped laser parameters, BBO is expected to extend simple compact Q-switched operation of diode-pumped lasers to average powers of 30–100 W.
The elastic, piezoelectric, and dielectric constants of single crystals of ammonium dihydrogen arsenate (ADA) have been measured in the temperature range 20°–80°C. While the six elastic constants and their temperature coefficients are similar to those of ADP, the piezoelectric and the dielectric constants are somewhat different. The relative dielectric constants K11 and K33 are 85 and 22, respectively, at 25°C. The piezoelectric constants d14 and d36 are 36.5×10−12 and 27.5×10−12 C/N, respectively, at 25°C. The loss tangents tanδ11 and tanδ33 are high, and are 1.2 and 9 at 1 kHz frequency. The specific resistivities ρ11 and ρ33 are low and are in the range 5×107 Ω cm measured at 25°C.
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