scholarly journals Improving the beam quality of DPALs by refractive index gradients induced by the pump beam in the heated gain medium: experimental verification of the theoretical prediction

2020 ◽  
Author(s):  
Roei Luzon ◽  
Svyatoslav Kostyukovets ◽  
Ilya Auslender ◽  
Nitzan Mayorkas ◽  
Eyal Yacoby ◽  
...  
Keyword(s):  
Refractive Index ◽  
Theoretical Prediction ◽  
Experimental Verification ◽  
Pump Beam ◽  
Beam Quality ◽  
Gain Medium

scholarly journals 1178 J, 527 nm near diffraction limited laser based on a complete closed-loop adaptive optics controlled off-axis multi-pass amplification laser system

2021 ◽  
Vol 9 ◽  
Author(s):  
Deen Wang ◽  
Xin Zhang ◽  
Wanjun Dai ◽  
Ying Yang ◽  
Xuewei Deng ◽  
...  
Keyword(s):  
Laser Beam ◽  
Adaptive Optics ◽  
Closed Loop ◽  
Focal Spot ◽  
Beam Quality ◽  
Laser System ◽  
Diffraction Limit ◽  
Kdp Crystal ◽  
Main Amplifier

Abstract A 1178 J near diffraction limited 527 nm laser is realized in a complete closed-loop adaptive optics (AO) controlled off-axis multi-pass amplification laser system. Generated from a fiber laser and amplified by the pre-amplifier and the main amplifier, a 1053 nm laser beam with the energy of 1900 J is obtained and converted into a 527 nm laser beam by a KDP crystal with 62% conversion efficiency, 1178 J and beam quality of 7.93 times the diffraction limit (DL). By using a complete closed-loop AO configuration, the static and dynamic wavefront distortions of the laser system are measured and compensated. After correction, the diameter of the circle enclosing 80% energy is improved remarkably from 7.93DL to 1.29DL. The focal spot is highly concentrated and the 1178 J, 527 nm near diffraction limited laser is achieved.

Beam quality of photonic-crystal fibers

2005 ◽  
Vol 23 (7) ◽  
pp. 2267-2270 ◽  
Author(s):  
A. Mafi ◽  
J.V. Moloney
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fibers ◽  
Beam Quality ◽  
Crystal Fibers

scholarly journals Improvement of the spatial beam quality of laser sources with an intracavity Bragg grating

2003 ◽  
Vol 28 (4) ◽  
pp. 242 ◽  
Author(s):  
Sylvie Yiou ◽  
François Balembois ◽  
Patrick Georges ◽  
Jean-Pierre Huignard
Keyword(s):  
Beam Quality ◽  
Bragg Grating ◽  
Spatial Beam ◽  
Laser Sources

Improving the beam quality of high-power laser diodes by introducing lateral periodicity into waveguides

2013 ◽  
Author(s):  
Grzegorz Sobczak ◽  
Elżbieta Dąbrowska ◽  
Marian Teodorczyk ◽  
Joanna Kalbarczyk ◽  
Andrzej Maląg
Keyword(s):  
High Power ◽  
Beam Quality ◽  
Laser Diodes ◽  
High Power Laser ◽  
Power Laser

Thermo-Fluid Design Simulation of Nd3+ POCl3 Transverse Flow Liquid Laser Cavity

2021 ◽  
pp. 1-31
Author(s):  
Vinod Singh ◽  
Gaurav Singhal ◽  
Prabal Talukdar
Keyword(s):  
Refractive Index ◽  
Temperature Gradient ◽  
Flow Rate ◽  
Optical Pumping ◽  
Gain Medium ◽  
Optical Path Difference ◽  
Path Difference ◽  
Transverse Flow ◽  
Optical Path ◽  
Liquid Laser

Abstract CFD based thermal design of a transverse flow optical cavity is carried out for 1 kW Nd3+ POCl3 liquid laser source to investigate temperature and velocity distribution in the optical pumping region of the cavity. Temperature gradient and turbulence both affect the refractive index of the liquid gain medium, which results in optical path difference, divergence and hence, poorer quality of the laser beam. The main purpose of this design is to achieve uniform flow and least temperature gradient in the optical pumping region so that the optical path difference can be minimized and a good beam quality can be achieved. CFD model has been developed for carrying out thermo-fluid simulations for this thermal system and based on these simulations, an optimum geometry of inlet ports along with their position from optical pumping region have been proposed. A user defined function (UDF) is incorporated for the input of spatially varying heat source term in each cell of the optical pumping region of the cavity. Variations in refractive index and optical path difference are estimated from the temperature data using another UDF. Simulation reveals that mass flow rate between 1.5 kg/s to 2.0 kg/s maintains the optical homogeneity of gain medium. Preliminary experiments have been carried out to demonstrate the effect of flow rate on the beam divergence and thereby exhibiting the importance of present simulation work.

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