Numerical Analysis of Laser Beam Width and Beam Quality of Q-Switched Lasers Using Different Definitions of the Beam Width

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.

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Experimental Investigation of Polymeric Material Removal by Low Diffraction Laser Beam

Journal of Manufacturing Science and Engineering ◽

10.1115/1.1445156 ◽

2002 ◽

Vol 124 (2) ◽

pp. 475-480

Author(s):

Xuanhui Lu ◽

Y. Lawrence Yao ◽

Kai Chen

Keyword(s):

Laser Beam ◽

Polymeric Material ◽

Material Removal ◽

Beam Quality ◽

Power Level ◽

Average Power ◽

Laser Material ◽

Theoretical Predictions ◽

Removal Processes

Effects of improved beam quality of a low diffraction laser beam on laser material removal processes are experimentally investigated in a polymeric material. The experimental results are in agreement with theoretical predictions. The results show that the low diffraction beam has marked advantages over the Gaussian beam in ablation-dominated material removal processes in terms of larger depth and smaller taper at the same average power level.

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Laser beam quality of a high-PRF XeCl laser

10.1117/12.144628 ◽

1993 ◽

Author(s):

Olivier P. Uteza ◽

Marc L. Sentis ◽

Philippe C. Delaporte ◽

Bernard M. Forestier ◽

Bernard L. Fontaine ◽

...

Keyword(s):

Laser Beam ◽

Beam Quality ◽

Xecl Laser ◽

Laser Beam Quality

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Improving Slow-Axis Laser Beam Quality of Semiconductor Laser with Edge Adiabatic Package

Chinese Journal of Lasers ◽

10.3788/cjl202047.0105002 ◽

2020 ◽

Vol 47 (1) ◽

pp. 0105002

Author(s):

赵碧瑶 Zhao Biyao ◽

井红旗 Jing Hongqi ◽

仲莉 Zhong Li ◽

曼玉选 Man Yuxuan ◽

班雪峰 Ban Xuefeng ◽

...

Keyword(s):

Laser Beam ◽

Semiconductor Laser ◽

Beam Quality ◽

Slow Axis ◽

Laser Beam Quality

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Laser beam quality of high pulse repetition frequency excimer lasers

Optics Communications ◽

10.1016/0030-4018(93)90432-5 ◽

1993 ◽

Vol 102 (5-6) ◽

pp. 523-531 ◽

Cited By ~ 6

Author(s):

O.P. Uteza ◽

M.L. Sentis ◽

Ph.C. Delaporte ◽

B.M. Forestier ◽

B.L. Fontaine

Keyword(s):

Laser Beam ◽

Beam Quality ◽

Pulse Repetition Frequency ◽

Repetition Frequency ◽

Pulse Repetition ◽

Excimer Lasers ◽

Laser Beam Quality ◽

High Pulse ◽

High Pulse Repetition Frequency

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Tunable terahertz radiation generation by nonlinear photomixing of cosh-Gaussian laser pulses in corrugated magnetized plasma

Laser and Particle Beams ◽

10.1017/s0263034617000167 ◽

2017 ◽

Vol 35 (2) ◽

pp. 279-285 ◽

Cited By ~ 8

Author(s):

P. Varshney ◽

V. Sajal ◽

A. Upadhyay ◽

J. A. Chakera ◽

R. Kumar

Keyword(s):

Magnetic Field ◽

Beam Quality ◽

Beam Width ◽

Laser Pulses ◽

Magnetized Plasma ◽

Thz Radiation ◽

Oscillatory Velocity ◽

Radiation Generation ◽

Factor Α

AbstractThis paper presents a scheme of THz generation by nonlinear photomixing of two cosh-Gaussian lasers pulses having different frequencies (ω1, ω2) and wave numbers $(\vec k_1, \vec k_2 )$ and same electrical field amplitude in a corrugated plasma embedded with transverse static magnetic field. Cosh-Gaussian laser pulses have steep gradient in intensity profile along with wider cross-section, which exerts a stronger nonlinear ponderomotive force at ω1 − ω2 and $\vec k_1 - \vec k_2 $ on plasma electrons imparting a nonlinear oscillatory velocity to plasma electrons. Oscillatory plasma electrons couple with the density ripple n′ = nα0eiαx to produce a nonlinear current, which is responsible for resonant THz radiation at frequency $\sim\left( {{\rm \omega} _{\rm c}^2 + {\rm \omega} _{\rm p}^2} \right)^{1/2} $. The amplitude, efficiency and beam quality of THz radiation can be optimized by choosing proper corrugation factor (α of the plasma), applied magnetic field (ωc), decentered parameter (b), and beam width parameter a0 of cosh-Gaussian lasers. An efficiency of $\sim\!10^{ - 2} - 10^{ - 1} $ is achieved for laser electric field E = 3.2 × 109 V/cm.

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