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:doi:10.3788/COL201917.051403

Chinese Optics Letters, 2019, 17 (5): 051403, Published Online: May. 13, 2019

1.57 times diffraction-limit high-energy laser based on a Nd:YAG slab amplifier and an adaptive optics system Download： 1555次Cover Paper

Licheng Sun ¹Tinghao Liu ¹Xing Fu ¹Yading Guo ²Xiaojun Wang ²Chongfeng Shao ²Yamin Zheng ¹Chuang Sun ¹Shibing Lin ¹Lei Huang ^1,*

Author Affiliations

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

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

Figures & Tables

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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Table1. 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[J]. Chinese Optics Letters, 2019, 17(5): 051403.

1.57 times diffraction-limit high-energy laser based on a Nd:YAG slab amplifier and an adaptive optics system Download： 1555次Cover Paper

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.

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.

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

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, $HBQ = 1.01$ .

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

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.

Table1. PV Value, RMS Value, and HBQ of the Defocus Distributed in Different Arrays After Correction

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1.57 times diffraction-limit high-energy laser based on a Nd:YAG slab amplifier and an adaptive optics system Download： 1555次Cover Paper

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.

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.

Fig. 4. Actuators distribution of the DM and the 3×1 beam array.

Fig. 6. Correction result of the defocus distributed in a 1×1 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.

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

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.

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

Table1. PV Value, RMS Value, and HBQ of the Defocus Distributed in Different Arrays After Correction

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

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, $HBQ = 1.01$ .