A chirp-compensated, injection-seeded alexandrite laser
A chirp-compensated, injection-seeded alexandrite laser
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线性调频补偿、注入籽晶翠玉激光器
DOI：
10.1007/pl00021153
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
J. Walling
中科院分区：
文献类型：
--
作者：
P. Bakule;P. Baird;M. Boshier;S. Cornish;D. Heller;K. Jungmann;I. Lane;V. Meyer;P. Sandars;W. Toner;M. Towrie;J. Walling
描述了一种适用于高分辨率光谱学的调Q紫翠宝石激光器，它能在10 MHz带宽内产生35 mJ能量的脉冲，具有高纯度TEM 00模式。激光器可以在100 ns内与外部事件同步。输出脉冲长度为120 ns，重复频率为25 Hz。该激光器是由一个钛：蓝宝石激光器操作约730 nm的注入种子。为了在外部触发条件下保持单模播种，并获得小的时间抖动，使用主动腔长控制。为了实现10 MHz的输出带宽，腔内电光调制器被用来补偿频率啁啾。发现变翠玉的折射率与反转密度呈线性关系，比例常数为1.6×10-24 cm ~ 3。在730 nm处的脉冲操作中，由于这种效应引起的折射率变化仅部分地由由于基态声子弛豫引起的变化补偿。
Abstract.A Q-switched alexandrite laser suitable for high-resolution spectroscopy is described which produces pulses of 35 mJ energy in a 10 MHz bandwidth, with a high-purity TEM00 mode. The laser can be synchronised to external event to within 100 ns. The output pulse length is 120 ns and the repetition rate 25 Hz. The laser is injection-seeded by a Ti:sapphire laser operating around 730 nm. To preserve single-mode seeding under external triggering conditions, and to obtain small time-jitter, active cavity length control was used. In order to achieve the 10 MHz output bandwidth, intra-cavity electro-optic modulators were used to compensate for the frequency chirp. The refractive index of alexandrite was found to vary linearly with inversion density with a constant of proportionality equal to 1.6×10-24 cm3. In pulsed operation at 730 nm, the index change due to this effect is only partially compensated by changes due to ground state phonon relaxation.