Post on 19-May-2018
Introduction to Diode Pumped Alkali vapor Laser -DPAL
Lin li Institute of Electronics, Chinese
Academy of Sciences Rongqing Tan
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Laser-Light Amplification by Stimulated
Emission of Radiation
Properties:
Monochromatic
Directional
Coherent
2
http://science.discovery.com/tv-shows/sci-fi-science/videos/sci-fi-science-using-laser-beams.htm
Laser beam machining Laser cooling
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Type Typical Wavelength
Solid state lasers Neodymium-YAG 1.064µm
Gas lasers CO2 lasers 10.6µm
Semiconductor lasers Diode lasers 375-3500nm
Chemical lasers HF lasers 2.6-3.3nm
Types of Lasers
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Diode lasers Energy-
effectiveness Packaged
Long lifetime
Gas lasers Good beam quality Less
thermal effect
Diode pumped alkali vapor lasers
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Alkali D1 line(nm) D2 line(nm) ΔE(cm-1) QE(%)
Li 670.98 670.96 0.34 99.997
Na 589.76 589.16 17.2 99.898
K 770.11 766.70 57.7 99.557
Rb 794.98 780.25 237.9 98.147
Cs 894.59 852.35 554.1 95.278
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Alkali earth metals Alkali Quantum Efficiencies
2S1/2
2P3/2
D2 line pump D1 line
laser
2P1/2
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Three level diagram
Ground state
Pump state
Lasing state
Conclusion
1 DPAL is a new class of lasers with the advantage of high quantum efficiency, good beam quality and less thermal effect.
2 Using fluid medium to improve the efficiency and output laser power.
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Reference 1 Laser-Wikipedia
2 How a Laser Workshttp://muldoonshealthphysicspage.com/how_a_laser_works.htm
3 SCI FI SCIENCE
http://science.discovery.com/tv-shows/sci-fi-science/videos/sci-fi-science-using-laser-beams.htm
4 Focus: Landmarks: Laser Cooling of Atoms
5 Thesis: BROADBAND PUMPING EFFECTS ON THE DIODE PUMPED
6 Thesis: Theoretical investigation on diode pumped rubidium vapor laser
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