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.

Experimental Investigation of Polymeric Material Removal by Low Diffraction Laser Beam

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.

Laser beam quality of a high-PRF XeCl laser

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

scholarly journals XUV and Soft X-Ray Radiation from Laser Produced Plasmas as Laboratory Spectroscopic Sources

1984 ◽  
Vol 86 ◽  
pp. 212-212
Author(s):  
P. Gohil ◽  
M.L. Ginter ◽  
T.J. McIlrath ◽  
H. Kapoor ◽  
D. Ma ◽  
...  
Keyword(s):  
High Resolution ◽  
Laser Beam ◽  
Spectral Region ◽  
Focal Spot ◽  
Laser Energy ◽  
Diffraction Limit ◽  
High Resolution Spectroscopy ◽  
Diode Array ◽  
X Ray ◽  
Pin Photodiode

Laser produced plasmas have been shown to be excellent sources for applications in the XUV and soft X-ray spectral region. We are using a 550 mj, 25 ns (FWHM) ND:YAG laser operating at a repetition rate of 10 Hz to produce plasmas above rotatable solid targets. The focal spot of the laser beam with a 31 cm lens was measured to be 170 μm (approximately twice the diffraction limit), using a diode array having a 170 μm resolution. Broadband output in the soft X-ray region was studied using a windowless PIN photodiode with an A1203 surface covered with a polyethylene filter with transmission between 44 Å and 120 Å. Results are presented for the source’s soft X-ray intensity for several elements as a function of laser energy, focus and driving wavelength, as are preliminary results using the source for high resolution spectroscopy and for soft X-ray lithography.

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

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

scholarly journals Hundred-Joule-level, nanosecond-pulse Nd:glass laser system with high spatiotemporal beam quality

2016 ◽  
Vol 4 ◽  
Author(s):  
Sensen Li ◽  
Yulei Wang ◽  
Zhiwei Lu ◽  
Lei Ding ◽  
Yi Chen ◽  
...  
Keyword(s):  
Pulse Width ◽  
Frequency Conversion ◽  
Beam Quality ◽  
Laser System ◽  
Energy Output ◽  
Level Energy ◽  
Beam Diameter ◽  
System Operating ◽  
Nd:Glass Laser

A 100-J-level Nd:glass laser system in nanosecond-scale pulse width has been constructed to perform as a standard source of high-fluence-laser science experiments. The laser system, operating with typical pulse durations of 3–5 ns and beam diameter 60 mm, employs a sequence of successive rod amplifiers to achieve 100-J-level energy at 1053 nm at 3 ns. The frequency conversion can provide energy of 50-J level at 351 nm. In addition to the high stability of the energy output, the most valuable of the laser system is the high spatiotemporal beam quality of the output, which contains the uniform square pulse waveform, the uniform flat-top spatial fluence distribution and the uniform flat-top wavefront.

scholarly journals Frequency doubling of multi-terawatt picosecond pulses

1999 ◽  
Vol 17 (2) ◽  
pp. 281-286 ◽  
Author(s):  
D. NEELY ◽  
C.N. DANSON ◽  
R. ALLOTT ◽  
F. AMIRANOFF ◽  
J.L. COLLIER ◽  
...  
Keyword(s):  
Beam Quality ◽  
Laser System ◽  
Frequency Doubling ◽  
Crystal Thickness ◽  
Small Aperture ◽  
Picosecond Pulses ◽  
Large Aperture ◽  
Spot Quality

The frequency-doubling efficiency and resultant focal spot quality of a large aperture (140 × 89 mm) subpicosecond, chirped pulse amplified (CPA) 1054-nm beam for laser–matter interaction studies has been investigated using the Vulcan Nd:glass laser system (Danson et al. 1998). The effect of B-integral on the CPA beam quality was studied and is shown not to be the dominant cause of the observed frequency-doubled beam break-up. Conversion efficiency tests were carried out on small aperture KDP (type 1) crystals at a range of incident intensities up to 3 × 1011 W/cm2 giving the optimum crystal thickness for pulses in the 0.3–3 ps region. A large-aperture frequency-doubled beam was commissioned and delivered pulses of over 10 TW onto target for an electron acceleration experiment.

Sign in / Sign up

Export Citation Format

Share Document