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

Journals >Chinese Optics Letters >Volume 17 >Issue 5 >Page 051403 > Article

Chinese Optics Letters
Vol. 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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DOI: 10.3788/COL201917.051403 Cite this Article Set citation alerts

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 Copy Citation Text

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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. 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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(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. 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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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

Table 1. PV Value, RMS Value, and HBQ of the Defocus Distributed in Different Arrays After Correction

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References (16)

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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

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