Spatial light modulator based optically controlled beamformer for variable multiple-spot beam antenna

2011 ◽  
Author(s):  
Tomohiro Akiyama ◽  
Hirofumi Matsuzawa ◽  
Eisuke Haraguchi ◽  
Hideo Sumiyoshi ◽  
Toshiyuki Ando ◽  
...  
Keyword(s):  
Spatial Light Modulator ◽  
Light Modulator ◽  
Spot Beam ◽  
Multiple Spot

scholarly journals Stable and flexible multiple spot pattern generation using LCOS spatial light modulator

2014 ◽  
Vol 22 (20) ◽  
pp. 24722 ◽  
Author(s):  
Naoya Matsumoto ◽  
Haruyasu Itoh ◽  
Takashi Inoue ◽  
Tomoko Otsu ◽  
Haruyoshi Toyoda
Keyword(s):  
Spatial Light Modulator ◽  
Pattern Generation ◽  
Spot Pattern ◽  
Light Modulator ◽  
Multiple Spot

scholarly journals Ultrashort-pulsed laser processing with spatial and temporal beam shaping using a spatial light modulator and burst modes

2021 ◽  
Vol 1135 (1) ◽  
pp. 012026
Author(s):  
Christian Lutz ◽  
Cemal Esen ◽  
Ralf Hellmann
Keyword(s):  
Laser Power ◽  
Spatial Light Modulator ◽  
Ablation Rate ◽  
Beam Shaping ◽  
Beam Profile ◽  
Pulsed Lasers ◽  
Light Modulator ◽  
Ablation Efficiency ◽  
Ultrashort Pulsed Lasers ◽  
Spot Beam

Abstract We report on the effect of simultaneous spatial and temporal beam shaping on the ablation rate, ablation efficiency and the resulting surface characteristics of micromachined stainless steel using ultrashort-pulsed lasers. Beam shaping and the use of pulse bursts are promising methods to allocate the over the last decades increasing laser power of ultrashort-pulsed lasers in ablation processes. While the individual effects of beam shaping and pulse bursts on the ablation characteristics have recently been examined, the combination of both has not yet been adequately investigated. Using a spatial light modulator to generate different spot distributions with up to six spots and different separations it is possible to spatially distribute the available laser power. In combination with temporal beam shaping using a 200 kHz repetition rate and pulse bursts with a 40 MHz intra-burst rate, we investigate the influences in a scanning-based process and find an increasing ablation rate and efficiency for higher fluences. Subsequently using bursts in combination with a multi-spot beam profile, we found a distinctive emergence of cone like protrusions and a smoothing effect for fluences between 1.5 J/cm² and 3 J/cm² with six spot beam profile.

A high-end mask writer using a spatial light modulator

2005 ◽  
Author(s):  
Ulric B. Ljungblad ◽  
Per Askebjer ◽  
Tord Karlin ◽  
Tor Sandstrom ◽  
Henrik Sjoeberg
Keyword(s):  
Spatial Light Modulator ◽  
Light Modulator

Generation of vector beams array with a single spatial light modulator

2021 ◽  
pp. 126915
Author(s):  
Lijiao Guo ◽  
Zhiqing Feng ◽  
Yating Fu ◽  
Changjun Min
Keyword(s):  
Spatial Light Modulator ◽  
Light Modulator ◽  
Vector Beams
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