Parasitic effects in ultra-broadband degenerate optical parametric amplification
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摘要: 详细研究了在走离补偿及非走离补偿两种方式下，钛宝石（Ti: sapphire）激光倍频泵浦的非共线超宽带简并光参量放大中二次谐波寄生效应的影响。研究表明，在非走离补偿方式下，通过适当增加泵浦光与信号光的非共线角，在确保信号光宽光谱放大的同时，可以有效降低二次谐波寄生效应对信号光输出光谱的影响。获得了不同泵浦光光谱带宽下，简并光参量放大的信号光输出光谱及输出通量演化规律，明确了在给定信号光输出光谱带宽下对泵浦光光谱带宽的要求。研究结果为基于简并光参量放大的超宽带高时域对比度飞秒种子光产生提供设计依据。
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关键词:
- 超宽带简并光参量放大 /
- 二次谐波 /
- 寄生效应
Abstract: This paper conducts a detailed study on the influence of second-harmonic parasitic effects in non-collinear ultra-broadband degenerate optical parametric amplification (OPA), which is pumped by frequency-doubled Ti:sapphire lasers. We consider both walk-off compensation and non-walk-off compensation scenarios. The study reveals that, under the non-walk-off compensation method, by appropriately increasing the non-collinear angle between the pump and signal beams, the impact of second-harmonic parasitic effects on the signal's output spectrum can be effectively reduced while ensuring broad-spectrum amplification of the signal. The evolution of the signal's output spectrum and output flux is investigated for different pump spectral bandwidths, clarifying the requirements for the pump spectral bandwidth given a specific signal output spectral bandwidth. The research findings provide design guidelines for generating ultra-broadband, high-temporal contrast femtosecond seed based on degenerate OPA. -
图 1 宽带简并光参量放大原理示意图
Figure 1. Schematic of the broadband OPA at degeneracy（SHG: second harmonic generation）
图 2 BBO晶体中两种非共线相位匹配方式
Figure 2. Two types of non-collinear phase matching in BBO Crystal
图 3 BBO晶体第一类相位匹配方式下简并光参量放大及二次谐波相位匹配曲线
Figure 3. Phase matching curves for degenerate OPA and SHG in BBO crystal with type I phase matching
图 4 SLIEX-II激光装置前端ps-OPCPA注入种子光光谱和光参量放大光谱
Figure 4. Incident seed spectrum for the ps-OPCPA front-end of the SLIEX-II laser facility, and optical parametric amplified spectrum
图 5 初始泵浦光及信号光时域波形和光谱
Figure 5. Temporal waveforms and spectra of the initial pump and signal
图 6 忽略信号光与闲频光倍频寄生效应情况下简并光参量放大输出性能
Figure 6. Output performance of degenerate optical parametric amplification ignoring the second harmonic parasitic effects of signal and idler
图 7 走离补偿方式下二次谐波寄生效应对简并光参量放大的影响
Figure 7. Impact of second harmonic parasitic effects on degenerate optical parametric amplification with walk-off compensation
图 8 非走离补偿方式下二次谐波寄生效应对简并光参量放大的影响
Figure 8. Impact of second harmonic parasitic effects on degenerate optical parametric amplification with non-walk-off compensation,
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