A method measuring thermal lens focal length of all rays polarized in radial and tangential direction of high power Nd:YAG laser

2004 ◽  
Vol 241 (1-3) ◽  
pp. 155-158 ◽  
Author(s):  
Qiang Li ◽  
Zhimin Wang ◽  
Tiechuan Zuo
Keyword(s):  
High Power ◽  
Thermal Lens ◽  
Nd:Yag Laser ◽  
Focal Length ◽  
Tangential Direction ◽  
Lens Focal Length

scholarly journals Phase shift of amplitude-modulated optical signals in graphene oxide water dispersions due to thermal lens focal length oscillation

2014 ◽  
Vol 31 (5) ◽  
pp. 1018 ◽  
Author(s):  
Sonia Melle ◽  
Oscar G. Calderón ◽  
Ana Egatz-Gómez ◽  
E. Cabrera-Granado ◽  
F. Carreño ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Phase Shift ◽  
Thermal Lens ◽  
Focal Length ◽  
Optical Signals ◽  
Lens Focal Length

A Method for Measuring Thermal Lens Focal Length of End-Pumped Nd:GdVO4Crystals

2009 ◽  
Vol 36 (11) ◽  
pp. 3031-3034
Author(s):  
项震 Xiang Zhen ◽  
付鑫 Fu Xin ◽  
葛剑虹 Ge Jianhong
Keyword(s):  
Thermal Lens ◽  
Focal Length ◽  
Lens Focal Length

More precise determination of thermal lens focal length for end-pumped solid-state lasers

2006 ◽  
Vol 266 (2) ◽  
pp. 620-626 ◽  
Author(s):  
Shuzhen Fan ◽  
Xingyu Zhang ◽  
Qingpu Wang ◽  
Shutao Li ◽  
Shuanghong Ding ◽  
...  
Keyword(s):  
Solid State ◽  
Thermal Lens ◽  
Focal Length ◽  
Precise Determination ◽  
Solid State Lasers ◽  
Lens Focal Length

scholarly journals Simulation of thermal lensing in an end-pumped Nd:YAG laser rod with Gaussian and super-Gaussian pump beam profile

2019 ◽  
Vol 11 (20) ◽  
pp. 81-84
Author(s):  
Mohammed Jalal Abdul-Razzak
Keyword(s):  
Numerical Simulation ◽  
Pump Power ◽  
Nd:Yag Laser ◽  
Pump Beam ◽  
Focal Length ◽  
Thermal Lensing ◽  
Lensing Effect ◽  
Thermal Lensing Effect ◽  
Lens Focal Length ◽  
Waist Radius

A numerical simulation is made on the thermal lensing effect in an laser diode end-pumped Nd:YAG laser rod. Based on finite element method (FEM), the laser rod temperature distribution is calculated and the focal length is deduced for a Gaussian and super-Gaussian pump beam profiles. At the pump power of 20W, the highest temperature located at the center of end-pumped face was 345K, and the thermal lens focal length was 81.4mm along the x-z axis.  The results indicate that the thermal lensing effect sensitively depend on the pump power, waist radius of the pump beam and the pump distribution in a laser rod geometry.

scholarly journals Evaluating effects of focal length and viewing angle in a comparison of recent face landmark and alignment methods

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Xiang Li ◽  
Jianzheng Liu ◽  
Jessica Baron ◽  
Khoa Luu ◽  
Eric Patterson
Keyword(s):  
Focal Length ◽  
Ground Truth ◽  
Detection Methods ◽  
Viewing Angle ◽  
Deep Convolutional Neural Networks ◽  
Landmark Detection ◽  
High Performing ◽  
Detection Techniques ◽  
And Performance ◽  
Lens Focal Length

AbstractRecent attention to facial alignment and landmark detection methods, particularly with application of deep convolutional neural networks, have yielded notable improvements. Neither these neural-network nor more traditional methods, though, have been tested directly regarding performance differences due to camera-lens focal length nor camera viewing angle of subjects systematically across the viewing hemisphere. This work uses photo-realistic, synthesized facial images with varying parameters and corresponding ground-truth landmarks to enable comparison of alignment and landmark detection techniques relative to general performance, performance across focal length, and performance across viewing angle. Recently published high-performing methods along with traditional techniques are compared in regards to these aspects.

scholarly journals Thermal lens shaping in Brewster gain media: A high-power, diode-pumped Nd:GdVO4 laser

2004 ◽  
Vol 12 (7) ◽  
pp. 1426 ◽  
Author(s):  
N. W. Rimington ◽  
S. L. Schieffer ◽  
W. Andreas Schroeder ◽  
Brian K. Brickeen
Keyword(s):  
High Power ◽  
Thermal Lens ◽  
Diode Pumped ◽  
Power Diode ◽  
Gain Media
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