1.57 times diffraction-limit high-energy laser based on a Nd:YAG slab amplifier and an adaptive optics system

Licheng Sun; Tinghao Liu; Xing Fu; Yading Guo; Xiaojun Wang; Chongfeng Shao; Yamin Zheng; Chuang Sun; Shibing Lin; Lei Huang

doi:10.3788/COL201917.051403

Chinese Optics Letters, Volume. 17, Issue 5, 051403(2019)

1.57 times diffraction-limit high-energy laser based on a Nd:YAG slab amplifier and an adaptive optics system On the Cover

Licheng Sun¹, Tinghao Liu¹, Xing Fu¹, Yading Guo², Xiaojun Wang², Chongfeng Shao², Yamin Zheng¹, Chuang Sun¹, Shibing Lin¹, and Lei Huang^1、*

Author Affiliations

¹Center for Photonics and Electronics, Department of Precision Instruments, Tsinghua University, Beijing 100084, China

²Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China

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Figures & Tables(10)

Fig. 1. Schematic of the Nd:YAG slab amplifier with an AO configuration. HR, high reflection mirror; PBS, polarization beam splitter; GM, gain module; QWP, quarter-wave plate; TS, telescope.

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Fig. 2. (a) LD array. (b) Gain module without shaping optics. (c) Simulation pump intensity distribution in a Nd:YAG slab without shaping optics. The red rectangle represents the laser beam in a Nd:YAG slab.

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Fig. 3. Experimental results with the $3 \times 1$ pump-beam array. Near-field intensity distribution (a) before correction, $D_{N} = 4.09 mm$ and (b) after correction, $D_{N} = 4.55 mm$ . Far-field intensity distribution (c) before correction, $D_{F} = 5.10 mm$ , $HBQ = 10.89$ and (d) after correction, $D_{F} = 2.33 mm$ , $HBQ = 5.54$ . The circles in the far-field pattern represent the measured beam diameters.

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Fig. 4. Actuators distribution of the DM and the $3 \times 1$ beam array.

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Fig. 5. Correction result of the defocus distributed in a $3 \times 1$ array. (a) Wavefront before correction. (b) Far-field intensity distribution before correction, $HBQ = 10.89$ . (c) Wavefront after correction. (d) Far-field intensity distribution after correction, $HBQ = 6.44$ . The far-field intensity distributions were initialized by the peak value of the far-field intensity of an ideal square-flat-topped beam.

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Fig. 6. Correction result of the defocus distributed in a $1 \times 1$ array. (a) Wavefront before correction. (b) Far-field beam intensity distribution before correction, $HBQ = 4.32$ . (c) Wavefront after correction. (d) Far-field beam intensity distribution after correction, $HBQ = 1.01$ .

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Fig. 7. HBQ after correction with different beam arrays.

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Fig. 8. (a) Gain module with a pump-light homogenizer. (b) Simulation pump intensity distribution in a Nd:YAG slab with a pump-light homogenizer.

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Fig. 9. Experimental results with the pump-beam array. Near-field intensity distribution (a) before correction, $D_{N} = 3.01 mm$ , and (b) after correction, $D_{N} = 3.31 mm$ . Far-field intensity distribution (c) before correction, $D_{F} = 3.49 mm$ , $HBQ = 5.49$ , and (d) after correction, $D_{F} = 0.91 mm$ , $HBQ = 1.57$ .

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Table 1. PV Value, RMS Value, and HBQ of the Defocus Distributed in Different Arrays After Correction
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Table 1. PV Value, RMS Value, and HBQ of the Defocus Distributed in Different Arrays After Correction
Array Dimension $1 \times 1$ $2 \times 1$ $2 \times 2$ $3 \times 1$ $3 \times 3$
PV/μm 0.70 3.72 6.30 6.41 8.74
RMS/μm 0.05 0.34 0.52 1.01 1.19
HBQ 1.01 1.70 2.87 6.44 7.22

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Licheng Sun, Tinghao Liu, Xing Fu, Yading Guo, Xiaojun Wang, Chongfeng Shao, Yamin Zheng, Chuang Sun, Shibing Lin, Lei Huang, "1.57 times diffraction-limit high-energy laser based on a Nd:YAG slab amplifier and an adaptive optics system," Chin. Opt. Lett. 17, 051403 (2019)

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