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| 探测光斑尺寸对热透镜聚焦误差信号的影响 |
| Influence of probe-beam size on focus-error signal induced by thermal lens |
| 投稿时间：2021-01-27 |
| DOI：10.3969/j.issn.1005-5630.2021.04.005 |
| 中文关键词: 热透镜 聚焦误差信号 构型优化 线性范围 |
| 英文关键词:thermal lens focus-error signal configuration optimization linear range |
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| 中文摘要: |
| 为研究探测光斑尺寸对热透镜聚焦误差信号的影响，建立了基于光学相移理论的热透镜聚焦误差信号理论模型，给出了构型参数优化条件及最大聚焦误差信号的理论值。通过数值计算，分析了探测光斑尺寸对聚焦误差信号及其线性范围的影响。计算结果表明：聚焦误差信号随着探测光斑半径的增大先增大后减小，当探测光斑半径为激励光斑半径的1.14倍时聚焦误差信号最大，与理论结果一致；聚焦误差信号的线性范围随着探测光斑半径的增大而减小，在探测光的最大光学相移小于0.4 rad时，聚焦误差信号的非线性误差小于1%。 |
| 英文摘要: |
| In order to study the influence of probe-beam size on the amplitude of focus-error signal, a theoretical model based on optical phase-shift theory is developed to describe the focus-error signal. The optimum conditions on geometric parameters and the maximum amplitude of focus-error signal are derived based on this model. The influences of probe beam size on the amplitude and linear range of focus-error signal are discussed by numerical calculation. The calculation results show that both the amplitude and the linear range of focus-error signal are highly related to the radius of probe beam. The amplitude of the focus-error signal increases as the probe-beam radius increases initially and decreases afterwards. The maximum amplitude of focus-error signal is obtained when the probe-beam radius is about 1.14 time of the excitation -beam radius, which is consistent with the theoretical results. The linear range of focus-error signal decreases as the probe beam radius increase. Under optimized conditions, the nonlinear error of the focus-error signal is less than 1% when the maximum phase shift of probe beam is less than 0.4 radian. |
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