scholarly journals Single lens sensor and reference for auto-alignment

2018 ◽  
Vol 6 ◽  
Author(s):  
Shun-Xing Tang ◽  
Ya-Jing Guo ◽  
Dai-Zhong Liu ◽  
Lin Yang ◽  
Xiu-Qing Jiang ◽  
...  
Keyword(s):  
High Power ◽  
Laser System ◽  
Beam Line ◽  
High Power Laser ◽  
Power Laser ◽  
Basic Technique ◽  
Single Lens ◽  
Laser Systems

Auto-alignment is a basic technique for high-power laser systems. Special techniques have been developed for laser systems because of their differing structures. This paper describes a new sensor for auto-alignment in a laser system, which can also serve as a reference in certain applications. The authors prove that all of the beam transfer information (position and pointing) can theoretically be monitored and recorded by the sensor. Furthermore, auto-alignment with a single lens sensor is demonstrated on a simple beam line, and the results indicate that effective auto-alignment is achieved.

scholarly journals Direct prejudgement of hot images with detected diffraction rings in high power laser system

2018 ◽  
Vol 6 ◽  
Author(s):  
Aihua Yang ◽  
Zhan Li ◽  
Dean Liu ◽  
Jie Miao ◽  
Jianqiang Zhu
Keyword(s):  
High Power ◽  
Laser System ◽  
Front Surface ◽  
High Power Laser ◽  
Power Laser ◽  
Diffraction Ring ◽  
Main Amplifier ◽  
Laser Systems ◽  
High Power Laser System ◽  
And Cluster Analysis

A direct prejudgement strategy that takes the diffraction ring as the analysis target is put forward to predict hot images induced by defects of tens of microns in the main amplifier section of high power laser systems. Analysis of hot-image formation process shows that the hot image can be precisely calculated with the extracted intensity oscillation of the diffraction ring on the front surface of the nonlinear plate. The gradient direction matching (GDM) method is adopted to detect diffraction rings. Recognition of simulated diffraction rings shows that it is feasible to directly prejudge hot images induced by those closely spaced defects and the defects that are far apart from each other. Image compression and cluster analysis are utilized to optimize the performance of the GDM method in recognizing actually collected diffraction images. Results show that hot images induced by defects of tens of microns can be directly prejudged without redundant information.

scholarly journals Advanced LIGO Laser Systems for O3 and Future Observation Runs

Galaxies ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 84
Author(s):  
Nina Bode ◽  
Joseph Briggs ◽  
Xu Chen ◽  
Maik Frede ◽  
Peter Fritschel ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
High Power ◽  
Beam Quality ◽  
Laser System ◽  
Low Noise ◽  
High Power Laser ◽  
Power Laser ◽  
The Third ◽  
Laser Systems ◽  
Laser Sources

The advanced LIGO gravitational wave detectors need high power laser sources with excellent beam quality and low-noise behavior. We present a pre-stabilized laser system with 70 W of output power that was used in the third observing run of the advanced LIGO detectors. Furthermore, the prototype of a 140 W pre-stabilized laser system for future use in the LIGO observatories is described and characterized.

scholarly journals Characterization of Accumulated B-Integral of Regenerative Amplifier Based CPA Systems

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 847
Author(s):  
Stefan Bock ◽  
Franziska Marie Herrmann ◽  
Thomas Püschel ◽  
Uwe Helbig ◽  
René Gebhardt ◽  
...  
Keyword(s):  
High Power ◽  
Ultrashort Pulse ◽  
Laser System ◽  
Operation Mode ◽  
High Power Laser ◽  
Power Laser ◽  
Regenerative Amplifier ◽  
Ultrashort Pulse Laser ◽  
Laser Systems ◽  
Ultrashort Pulse Laser System

We report on a new approach to measure the accumulated B-integral in the regenerative and multipass amplifier stages of ultrashort-pulse high-power laser systems by B-integral-induced coupling between delayed test post-pulses and the main pulse. A numerical model for such non-linear pulse coupling is presented and compared to data taken at the high-power laser Draco with self-referenced spectral interferometry (SRSI). The dependence of the B-integral accumulated in the regenerative amplifier on its operation mode enables optimization strategies for extracted energy vs. collected B-integral. The technique presented here can, in principle, be applied to characterize any type of ultrashort pulse laser system and is essential for pre-pulse reduction.

Large Mode Area Solid-Core Photonic Bandgap Yb-doped Fiber with Hetero-Structured Cladding for Compact High-Power Laser Systems

2021 ◽  
pp. 1-1
Author(s):  
Olivier Vanvincq ◽  
Andy Cassez ◽  
Remi Habert ◽  
Hicham El Hamzaoui ◽  
Karen Baudelle ◽  
...  
Keyword(s):  
High Power ◽  
Photonic Bandgap ◽  
Solid Core ◽  
High Power Laser ◽  
Power Laser ◽  
Large Mode Area ◽  
Laser Systems ◽  
Mode Area

ALD anti-reflection coatings at 1ω, 2ω, 3ω, and 4ω for high-power ns-laser application

2018 ◽  
Vol 7 (1-2) ◽  
pp. 23-31 ◽  
Author(s):  
Hao Liu ◽  
Lars Jensen ◽  
Ping Ma ◽  
Detlev Ristau
Keyword(s):  
High Power ◽  
High Surface ◽  
Laser System ◽  
Damage Threshold ◽  
Atomic Layer ◽  
Intensity Difference ◽  
High Power Laser ◽  
Power Laser ◽  
Laser Applications ◽  
Laser Induced Damage

AbstractAtomic layer deposition (ALD) facilitates the deposition of coatings with precise thickness, high surface conformity, structural uniformity, and nodular-free structure, which are properties desired in high-power laser coatings. ALD was studied to produce uniform and stable Al2O3and HfO2single layers and was employed to produce anti-reflection coatings for the harmonics (1ω, 2ω, 3ω, and 4ω) of the Nd:YAG laser. In order to qualify the ALD films for high-power laser applications, the band gap energy, absorption, and element content of single layers were characterized. The damage tests of anti-reflection coatings were carried out with a laser system operated at 1ω, 2ω, 3ω, and 4ω, respectively. The damage mechanism was discussed by analyzing the damage morphology and electric field intensity difference. ALD coatings exhibit stable growth rates, low absorption, and rather high laser-induced damage threshold (LIDT). The LIDT is limited by HfO2as the employed high-index material. These properties indicate the high versatility of ALD films for applications in high-power coatings.

scholarly journals Wavefront Shaping by a Small-Aperture Deformable Mirror in the Front Stage for High-Power Laser Systems

2017 ◽  
Vol 7 (4) ◽  
pp. 379 ◽  
Author(s):  
Sensen Li ◽  
Luoxian Zhou ◽  
Can Cui ◽  
Kai Wang ◽  
Xiusheng Yan ◽  
...  
Keyword(s):  
High Power ◽  
Deformable Mirror ◽  
High Power Laser ◽  
Power Laser ◽  
Small Aperture ◽  
Laser Systems ◽  
Wavefront Shaping ◽  
Front Stage

Research on Nonlinear Degeneration and Compensation of Beam Quality in High Power Laser System

2014 ◽  
Vol 34 (2) ◽  
pp. 0214005
Author(s):  
张鲁薇 Zhang Luwei ◽  
李晓彤 Li Xiaotong ◽  
岑兆丰 Cen Zhaofeng ◽  
阮望超 Ruan Wangchao ◽  
罗红妹 Luo Hongmei
Keyword(s):  
High Power ◽  
Beam Quality ◽  
Laser System ◽  
High Power Laser ◽  
Power Laser ◽  
High Power Laser System
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