Determination of the focused beam waist of lasers with weak measurements

Linguo Xie; Xiaodong Qiu; Jiangdong Qiu; Zhiyou Zhang; Jinglei Du; Fuhua Gao

doi:doi:10.3788/COL201513.112401

Chinese Optics Letters, 2015, 13 (11): 112401, Published Online: Sep. 13, 2018

Determination of the focused beam waist of lasers with weak measurements Download： 1010次

Linguo Xie ¹Xiaodong Qiu ¹Jiangdong Qiu ¹Zhiyou Zhang ^1,2,*Jinglei Du ^1,2Fuhua Gao ^1,2

Author Affiliations

¹ Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610064, China

² College of Physical Science and Technology, Sichuan University, Chengdu 610064, China

Figures & Tables

Fig. 1. (a) Experimental setup: the light source is a He-Ne laser at 632.8 nm (Thorlabs HNL210L); HWP, half-wave plate for attenuating the light intensity; L1, short-focus lens (variable); P1 and P2, Glan polarizers; prism with refractive index $n = 1.515$ (at 632.8 nm); L2, long-focus lens (150 mm); CCD, Coherent LaserCam HR. Dotted box: the schematic of the standard lock-in technology. PolM, polarization modulator; PSD, position sensitive detector; their frequencies keep synchronous. (b) and (c) denote the focused beam waist at different positions relative to the reflection surface.

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Fig. 2. $\partial Δ_{H} / \partial ω_{0}$ (the sensitivity of the amplified shift to the beam waist) varies with incident and postselection angles. The extreme values are indicated by the black dashed lines.

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Fig. 3. Amplified shift changing with the postselection angle and the beam waist. Here, the beam waist is chosen as 15.96, 19.09, and 20.81 μm. The incident angle is 65°. The squares, circles, and triangles denote the experiment data corresponding to different beam waists. The curves are theoretical predictions from Eq. (7).

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Linguo Xie, Xiaodong Qiu, Jiangdong Qiu, Zhiyou Zhang, Jinglei Du, Fuhua Gao. Determination of the focused beam waist of lasers with weak measurements[J]. Chinese Optics Letters, 2015, 13(11): 112401.

Determination of the focused beam waist of lasers with weak measurements Download： 1010次

Fig. 2. $\partial Δ_{H} / \partial ω_{0}$ (the sensitivity of the amplified shift to the beam waist) varies with incident and postselection angles. The extreme values are indicated by the black dashed lines.

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Determination of the focused beam waist of lasers with weak measurements Download： 1010次

Fig. 2. ∂ΔH/∂ω0 (the sensitivity of the amplified shift to the beam waist) varies with incident and postselection angles. The extreme values are indicated by the black dashed lines.

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Fig. 2. $\partial Δ_{H} / \partial ω_{0}$ (the sensitivity of the amplified shift to the beam waist) varies with incident and postselection angles. The extreme values are indicated by the black dashed lines.