2018 Fiscal Year Final Research Report
Development and application of intra-resonator coherent beam combination technique using an axicon as a retro-reflective mirror
| Project/Area Number |
16K04986
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Optical engineering, Photon science
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| Research Institution | Institute for Laser Technology |
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Principal Investigator |
Chosrowjan Haik 公益財団法人レーザー技術総合研究所, レーザープロセス研究チーム, 副主任研究員 (70291036)
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| Research Collaborator |
TANIGUCI seiji
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | Axicon lens / Corner-cube reflector / Axicon resonator / CCR resonator / Passive CBC |
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| Outline of Final Research Achievements |
High power, high brightness CW lasers with good beam quality are required for applications in material processing, environment monitoring, etc. Most high power solid-state laser developments occur based on the concept of master oscillator power amplifier. We explored the possibility of generating high power CW beams directly from the laser oscillator by using Axicon lens (AL) and corner-cube (CCR) retroreflectors as total reflection elements in the resonator.
Polarization and lasing characteristics of AL and CCR resonators have been studied theoretically and experimentally. Several characteristics of resonators with retro-reflecting elements have been recognized. Laser threshold and slope efficiencies were estimated at cryogenic and ambient temperatures. It was revealed that the coherence of the AL resonator output cannot be studied for the TRAM configuration because the beam polarization is elliptical and could not be controlled due to phase jumps caused by total internal reflection.
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| Free Research Field |
レーザー装置・材料
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| Academic Significance and Societal Importance of the Research Achievements |
The possibility of generating high-power and high-beam quality radiation directly from the resonator based on total reflection active mirror laser medium was evaluated.
Lasing characteristics of axicon lens with 90 degrees apex angle and corner-cube retro-reflector resonators have been studied.
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