Design and implementation of a dual aspheric integrated shaping element for a high-power fiber laser

Yupeng Xiong; Yupeng Xiong; Yupeng Xiong; Yupeng Xiong; Shiyu Chen; Shiyu Chen; Shiyu Chen; Yanxing Ma; Yang Ou; Yang Ou; Yang Ou; Yang Ou; Wenwen Lu; Wenwen Lu; Wenwen Lu; Yifan Dai; Yifan Dai; Yifan Dai; Shanyong Chen; Shanyong Chen; Shanyong Chen; Cheng Huang; Cheng Huang; Cheng Huang; Cheng Huang

doi:10.1364/AO.503237

Applied Optics
Vol. 62,
Issue 36,
pp. 9446-9453
(2023)
•https://doi.org/10.1364/AO.503237

Design and implementation of a dual aspheric integrated shaping element for a high-power fiber laser

Yupeng Xiong, Shiyu Chen, Yanxing Ma, Yang Ou, Wenwen Lu, Yifan Dai, Shanyong Chen, and Cheng Huang

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Yupeng Xiong, Shiyu Chen, Yanxing Ma, Yang Ou, Wenwen Lu, Yifan Dai, Shanyong Chen, and Cheng Huang, "Design and implementation of a dual aspheric integrated shaping element for a high-power fiber laser," Appl. Opt. 62, 9446-9453 (2023)

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Table of Contents Category
- Optical Design and Fabrication
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About this Article
History
- Original Manuscript: August 16, 2023
- Revised Manuscript: October 16, 2023
- Manuscript Accepted: October 30, 2023
- Published: December 11, 2023

Abstract

A dual aspheric integrated beam shaper suitable for a high-power laser situation has been designed and realized. The model for this lens was derived theoretically and the performance was evaluated using a detailed simulation. The ultrasonic vibration assisted cutting and the high-precision grinding and polishing technology were used for the processing. The surface accuracy was less than 200 nm measured with a profiler, and the roughness was smaller than 20 nm with the help of the white light interferometer. Shaping experiments were carried out, which verified that the Gaussian beam has uniform intensity distribution with a uniformity of 85.13% in the near field and converges to a point in the far field, which is exactly as expected. It thus provides an actual selection for high-power laser shaping.

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Supplementary Material (1)

Name	Description
Code 1	The macro programming was compiled in the commercial optical design software in the optimization process based on the emerging and incident beam distribution patterns

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Parameters	$S_{1}$	$S_{2}$
k	−7.271	−2.336
Radius/mm	−5.000	−7.961
Lens spacing/mm	10.000	—
Semidiameter/mm	2.5	4
$c_{4}$	$1.418271 \times 10^{- 3}$	$4.896145 \times 10^{- 3}$
$c_{6}$	$- 1.748683 \times 10^{- 5}$	$1.079143 \times 10^{- 5}$

Parameters	Min-change	RMS $c h a n g e / λ$	Max-change	RMS $c h a n g e / λ$
Refractivity	−0.001	0.01759710	0.001	0.00560289
Radius of $S_{1}$	−0.01 mm	0.05756918	0.01 mm	0.06165639
Radius of $S_{2}$	−0.01 mm	0.09090881	0.01 mm	0.09153570
The conic of $S_{1}$	−0.01 mm	0.02055899	0.01 mm	0.00302209
The conic of $S_{2}$	−0.01 mm	0.02155898	0.01 mm	0.04298797
Offset of $S_{1}$ in x	−0.01 mm	0.08700540	0.01 mm	0.08700540
Offset of $S_{2}$ in x	−0.01 mm	0.08063617	0.01 mm	0.08093617
Offset of $S_{1}$ in y	−0.01 mm	0.08700540	0.01 mm	0.08700540
Offset of $S_{2}$ in y	−0.01 mm	0.08063616	0.01 mm	0.08063616
The x inclination of $S_{1}$	−0.01°	0.00053378	0.01°	0.00053378
The x inclination of $S_{2}$	−0.01°	$5.2916 \times 10^{- 6}$	0.01°	$5.2916 \times 10^{- 6}$
The y inclination of $S_{1}$	−0.01°	0.00053378	0.01°	0.00053378
The y inclination of $S_{2}$	−0.01°	$5.2916 \times 10^{- 6}$	0.01°	$5.2916 \times 10^{- 6}$
Lens spacing	−0.01 mm	0.01043970	0.01 mm	−0.00771934

Parameters	Value
Refractivity	1.46 at 1064 nm
Abbe number	63.96
Knoop hardness HK $100 ({k g / m}^{2})$	610
Young’s modulus E (Gpa)	73
Density ( $g / {c m}^{3}$ )	2.19
Thermal expansion coefficient (W/mK)	$0.5 \times 10^{- 6}$

Parameters		Rough	Fine
Cutting	Rotating speed (r/min)	3000	5000
	Feed rate (mm/min)	1300	1000
	Cutting depth (µm)	0.03	0.003
Tool	Corner radius (mm)	0.5
	Tool rake angle (°)	−25
	Tool clearance (°)	10
Ultrasonic	Voltage (V)	56	65
vibration	Frequency (kHz)	100	125
	Amplitude (nm)	970	600

Parameters		Value
Cutting	Rotating speed (r/min)	20000
	Feed rate (mm/r)	1500
	Cutting depth (mm)	0.004
Tool	Grinding head diameter (mm)	6
	Abrasive grit size	2000#

Abstract

Supplementary Material (1)

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Tables (5)

Equations (18)

Applied Optics