Post on 08-Apr-2018
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LASER BEAM MODES
& POLARIZATION
ANALYZERS
Birhan UUZ
birhanuguz@gmail.com
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Outline
Fundamental Properties of LASER,
Laser Beam Modes,
Laser Beam Mode Analyzers,
Polarization,
Polarization Analyzers.
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Coherent ,
Monochromic,
Directional,
Polarized.
http://80.251.40.59/eng.ankara.edu.tr/hsari/ders-optoelektronik.htm
Partial ReflectorTotal Reflector
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Laser Mode
-Longitudinal mode
-Transverse mode (Beam Mode)
Transverse
mode
Longitudinal
mode
http://80.251.40.59/eng.ankara.edu.tr/hsari/ders-optoelektronik.htm
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Longitudinal Mode
-Oscillation of electric field of light over time.
http://80.251.40.59/eng.ankara.edu.tr/hsari/ders-optoelektronik.htm
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Transverse Mode (Beam Mode)
Concave Lenses
-Electric field distribution on perpendicular direction of propagation of light.
http://80.251.40.59/eng.ankara.edu.tr/hsari/ders-optoelektronik.htm
Gaussian Distribution Hermite- Gaussian Distribution
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Laser Beam Mode Analyzers
Non-Electronic
Burn Spots On Thermal Paper
Acrylic Mode Burns
Electronic
Camera-Based Analyzer
Scanning Slit Analyzer
Scanning Knife-Edge Analyzer
The CVI Melles Griot Technical Guide, Gaussian Beam Optic, 2009
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Laser Beam AnalyzersNon-Electronic
Burn Spots On Thermal Paper
Briallant Nanosecond Laser System / Burn Spot On Thermal Paper at 1064 nm
15 cm 30 cm 120 cm 7,8 m
+ Easily and cheap.
-Without quantitative measurements
-Dynamic range of 3;
unburned, burned and over burned.
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Laser Beam Analyzers
+ Can see generally structure.
-Toxic fumes occurs,
-Very rough quantitative measurements,
- Only shows average over time of laser beam.
http://www.ophiropt.com/user_files/laser/beam_profilers/modecheckPre.pdf
Non-Electronic
Acrylic Mode Burns
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Laser Beam AnalyzersElectronic
Camera-Based Analyzer
http://www.newport.com/High-Resolution-Laser-Beam-Profiler/608093/1033/catalog.aspx
+ Acquire Real-time data and display,+ Quantitative measurements,+ Fast laser diagnosis.
- Delicate equipment,-Expensive.-Limited by pixel size between 5-10 m
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Laser Beam AnalyzerElectronic
Camera-Based Analyzer
Ankara University, Optical Materials Research Group, omag.ankara.edu.tr
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Laser Beam Analyzer
+ Quantitative measurements,
+ One image every few seconds.
- Signal to noise ratio is low,
- Signal must be like a Gaussian.
Thorlabs Beam Beam Analyzing Software, Operation Manual, 2011
Electronic
Scanning Slit Analyzer
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Laser Beam Analyzer
Thorlabs Beam Beam Analyzing Software, Operation Manual, 2011
Electronic
Scanning Slit Analyzer
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Laser Beam Analyzer
The CVI Melles Griot Technical Guide, Fundamental of Beam Profiling ,2009
Electronic
Scanning Knife-Edge Analyzer
+ Can measure beam diameter up to 1 m,
+ Quantitative measurements,
+ One image every few seconds,
+ Signal to noise ratio is high.
- Signal must be like a Gaussian.
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Polarization
J. A. Woollam Co., Inc., Tutorial, www.jawoollam.com/tutorial_2.html
Light can be described as an electromagnetic wave traveling throughspace.
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Polarization
J. A. Woollam Co., Inc., Tutorial, www.jawoollam.com/tutorial_2.html
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Polarization Analyzer
J. A. Woollam Co., Inc., A Short Course in Ellipsometry, Chapter 2
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References
http://80.251.40.59/eng.ankara.edu.tr/hsari/ders-optoelektronik.htm
The CVIMelles Griot Technical Guide, Gaussian Beam Optic, 2009
Quantel Briallant Nanosecond Laser System
http://www.ophiropt.com/user_files/laser/beam_profilers/modecheckPre.pdfhttp://www.newport.com/High-Resolution-Laser-Beam-
Profiler/608093/1033/catalog.aspx
Thorlabs Beam Beam Analyzing Software, Operation Manual, 2011
The CVI Melles Griot Technical Guide, Fundamental of Beam Profiling ,2009
J. A. Woollam Co., Inc., Tutorial,www.jawoollam.com/tutorial_2.html
J. A. Woollam Co., Inc., A Short Course in Ellipsometry, Chapter 2
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Thank You.
birhanuguz@gmail.com