High power high repetition rate picosecond optical parametric oscillator pumped by frequency doubled all-fiber Yb-doped MOPA
High power high repetition rate picosecond optical parametric oscillator pumped by frequency doubled all-fiber Yb-doped MOPA
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DOI：
10.1117/12.922852
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发表时间：
2012-05
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影响因子：
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通讯作者：
F. Kienle;S. Alam;P. Teh;D. Lin;J. Price;D. Hanna;D. Richardson;D. Shepherd
中科院分区：
文献类型：
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作者：
F. Kienle;S. Alam;P. Teh;D. Lin;J. Price;D. Hanna;D. Richardson;D. Shepherd
介绍了一种三硼酸锂(LBO)光参量振荡器(OPO)，它与脉冲压缩倍频主振荡器(MOPA)系统同步泵浦，MOPA系统由一个增益开关激光二极管和一系列掺Yb3+光纤放大器组成。来自MOPA的20ps脉冲在透射栅压缩器中被压缩到4.4ps，吞吐量效率为~70%，随后在20 mm长的LBO中以~60%的效率倍频，最大可达~25W。在典型泵浦功率为17W的情况下，获得了2.5W(877 Nm)和1.7W(1.3μm)的最大合成信号和闲置输出功率。分别获得了最大3.7W的740 nm信号功率和3.2ps的信号脉冲宽度。OPO在651 nm-1040 nm(信号)和1081 nm-2851 nm(空闲)范围内可调。据我们所知，这是绿色泵浦LBO OPO输出功率最高的一次。基于光纤的泵浦源可以在100 MHz到1 GHz之间工作，再加上极少的皮秒脉冲和光学振荡器的近红外可调谐特性，是一种非常有吸引力的非线性显微镜光源。
We demonstrate a lithium triborate (LBO) optical parametric oscillator (OPO), which is synchronously pumped with a pulse-compressed and frequency-doubled master-oscillator power-amplifier (MOPA) system consisting of a gain-switched laser diode and a series of Ytterbium-doped fiber amplifiers. The 20ps pulses from the MOPA were compressed in a transmission grating compressor down to 4.4ps with a throughput efficiency of ~70% and subsequently frequency-doubled with an efficiency of ~60% in a 20mm long LBO to a maximum of ~25W. With a typical pump power of 17W for the OPO, we obtained a maximum combined signal and idler output power of 2.5W (at 877nm) and 1.7W (at 1.3μm). Individually, a maximum signal power of up to 3.7W at 740 nm was obtained with a signal pulse duration of ~3.2ps. The OPO was widely tunable from 651nm-1040nm (signal) and from 1081nm-2851nm (idler). To the best of our knowledge, this is the highest output power from a green-pumped LBO OPO. The fiber-based pump source can potentially be operated between 100MHz and 1GHz, which in combination with the few-picosecond pulses and the near-IR tunability of the OPO is a very attractive source for nonlinear microscopy.