用低压KTP普克尔盒和微带传输线进行调Q长脉冲的任意整形

利用新电光材料ＫＴＰ晶体的有效电光系数γｃ１，制成电光开关，实验研究了它的热光效应。成功地用它对输出脉宽为５０ｎｓ的ＮｄＹＬＦ单纵模调Ｑ激光削波整形。实验表明，ＫＴＰ普克尔盒的半波电压低及电容小，配合微带传输线后，能够获得脉宽为１～１０ｎｓ，形状几乎任意可调的整形脉冲，改变了过去那种只把普克尔盒当作简单的削波元件、而无整形能力的状况。并提出了采用双块晶体、补偿结构ＫＴＰ普克尔盒的设想

A System for Arbitrary Shaping of Q-switch Laser Pulses Using KTP Pockels Cell and Microstrip Transmission Lines

A Pockels cell utilizing the effective EO coefficient γc1 of the relatively new EO crystal KTP is fabricated. Its thermo-optic properties were studied experimentally, and compensation of the static birefringence of the switch was achieved by temperature turning. Then the device was successfully used to slice and shape the 50 ns single axial mode, Nd:YLF Q-switched laser pulses. The experiments demonstrated that the KTP Pockels cell required a low half-wave voltage and had small capacitance. When driven by a pair of microstrip transmission lines, 1～10 ns pulses with almost arbitrarily tunable shapes could be obtained, and the Pockels cell was not only the simple pulse-slicing device (as usually believed before) any more. A thermally and dispersion compensated KTP Pockels cell is also discussed.