Single-cavity thin-disk regenerative amplifier with independently adjustable pulse repetition frequency and pulse width
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摘要:
为实现Yb:YAG单腔碟片再生放大器重复频率、脉冲宽度大范围双调节激光输出，本工作设计并搭建了双普克尔盒协同调控单腔Yb:YAG碟片再生放大器。依托双普克尔盒的时序配合与宽稳区谐振腔设计，保证高光束质量与高能量提取效率的同时，灵活实现了激光重复频率的大范围可调节输出，并通过调整两个压缩光栅之间的间距实现了输出激光脉冲宽度调节。实验结果表明：碟片再生放大器通过调节普克尔盒实现了1~50 kHz可调重复频率激光输出，并在50 kHz重复频率下，泵浦平均功率为503 W时，得到了最大输出功率93.1 W，光束质量因子Mx2=1.18，My2=1.01，输出激光近衍射极限，在1 kHz重复频率下，得到了单脉冲能量50.2 mJ激光输出，并通过改变双光栅压缩器间距，实现了1.34 ps至150.37 ps的脉冲宽度连续调节。碟片再生放大器成功实现了重复频率与脉冲宽度双参数可调激光输出。
Abstract:In order to achieve large-range dual adjustment of laser output in repetition rate and pulse width for a Yb:YAG single-cavity thin-disk regenerative amplifier, this work designed and constructed a dual Pockels cell collaboratively controlled single-cavity Yb:YAG thin-disk regenerative amplifier. Relying on the timing coordination of the dual Pockels cells and the design of a wide-stable-zone resonator, it ensured high beam quality and high energy extraction efficiency, while flexibly achieving a wide range of adjustable laser repetition frequency output. Additionally, the adjustment of the output laser pulse width was achieved by changing the distance between the two compression gratings. Experimental results show that the thin-disk regenerative amplifier achieved laser output with a tunable repetition frequency ranging from 1 to 50 kHz by regulating the Pockels cells. At a repetition frequency of 50 kHz and an average pump power of 503 W, a maximum output power of 93.1 W was obtained, with beam quality factors Mx2=1.18 and My2=1.01, indicating near-diffraction-limited output. At a repetition frequency of 1 kHz, a single-pulse energy of 50.2 mJ was achieved. By changing the spacing between the double-grating compressors, continuous tuning of the pulse width from 1.34 ps to 150.37 ps was realized. The thin-disk regenerative amplifier successfully realized laser output with dual-parameter tunability of repetition frequency and pulse width.
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Key words:
- Yb:YAG thin-disk /
- regenerative amplifier /
- repetition rate /
- pulse width /
- tunable
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图 1 Yb:YAG碟片再生放大器结构图
Figure 1. Structural diagram of Yb∶YAG thin disk regenerative amplifier.
图 2 谐振腔内碟片处光斑半径随碟片光焦度变化
Figure 2. Variation of the spot radius on the thin-disk with the thin-disk diopter in the resonator
图 4 不同重复频率下激光的平均功率随泵浦功率变化情况
Figure 4. Variation of average laser power with pump power at multiple repetition rates.
图 5 在平均功率93.1 W、重复频率50 kHz下输出激光的光束质量
Figure 5. The beam quality factor M2 of the output laser measured at the average power of 93.1 W and the repetition rate of 50 kHz.
图 6 输出激光压缩后的可调节脉冲宽度
Figure 6. Tunable pulse width of the output laser after pulse compression.
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