Adaptive optics for laser-beam focusing through the pinhole

2019 ◽  
Author(s):  
Alexis V. Kudryashov ◽  
Alexander Nikitin ◽  
Ilya Galaktionov ◽  
Julia Sheldakova ◽  
Vadim Samarkin ◽  
...  
Keyword(s):  
Laser Beam ◽  
Adaptive Optics ◽  
Beam Focusing

Laser beam focusing through the scattering medium by means of adaptive optics

2017 ◽  
Author(s):  
Ilya Galaktionov ◽  
Alexis Kudryashov ◽  
Julia Sheldakova ◽  
Alexander Nikitin
Keyword(s):  
Laser Beam ◽  
Adaptive Optics ◽  
Scattering Medium ◽  
Beam Focusing

Laser Failure Isolation Techniques Demonstrated On Test Structures

2008 ◽  
Author(s):  
Frank S. Arnold
Keyword(s):  
Integrated Circuits ◽  
Laser Beam ◽  
Case Studies ◽  
Induced Resistance ◽  
Simple Test ◽  
Resistance Change ◽  
Cross Sectional ◽  
Beam Focusing ◽  
Isolation Techniques ◽  
Heating Effects

Abstract To be better prepared to use laser based failure isolation techniques on field failures of complex integrated circuits, simple test structures without any failures can be used to study Optical Beam Induced Resistance Change (OBIRCH) results. In this article, four case studies are presented on the following test structures: metal strap, contact string, VIA string, and comb test structure. Several experiments were done to investigate why an OBIRCH image was seen in certain areas of a VIA string and not in others. One experiment showed the OBRICH variation was not related to the cooling and heating effects of the topology, or laser beam focusing. A 4 point probe resistance measurement and cross-sectional views correlated with the OBIRCH results and proved OBIRCH was able to detect a variation in VIA fabrication.

scholarly journals Effect of Laser Beam Focusing Adjustment on the Processing Quality of Aluminum Nitride Ceramic Micro-Holes

2021 ◽  
Vol 1865 (2) ◽  
pp. 022004
Author(s):  
Chunyan Yang ◽  
Yun Hao ◽  
Yangping Li ◽  
Bozhe Wang ◽  
Hai Yuan ◽  
...  
Keyword(s):  
Aluminum Nitride ◽  
Laser Beam ◽  
Processing Quality ◽  
Beam Focusing ◽  
Micro Holes

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.

Basic experiments of laser beam correction by adaptive optics microscope for the accurate manipulation of biological tissues

2017 ◽  
Author(s):  
Masayuki Hattori ◽  
Yosuke Tamada ◽  
Shin Oya ◽  
Yutaka Hayano ◽  
Yasuhiro Kamei
Keyword(s):  
Laser Beam ◽  
Adaptive Optics ◽  
Biological Tissues ◽  
Basic Experiments

Fast and low noise adaptive optics system for the correction of micro-aberrations of laser beam

2007 ◽  
Author(s):  
S. Avino ◽  
E. Calloni ◽  
R. De Rosa ◽  
L. Di Fiore ◽  
L. Milano ◽  
...  
Keyword(s):  
Laser Beam ◽  
Adaptive Optics ◽  
Low Noise ◽  
Adaptive Optics System

Laser beam focusing through the atmosphere aerosol

2017 ◽  
Author(s):  
Alexis V. Kudryashov ◽  
Ilya Galaktionov ◽  
Julia V. Sheldakova ◽  
Vadim Samarkin ◽  
Alexander N. Nikitin
Keyword(s):  
Laser Beam ◽  
Beam Focusing
Sign in / Sign up

Export Citation Format

Share Document