2022 Fiscal Year Final Research Report
Measurement of deactivation cross sections in diode-pumped alkali lasers and cross-check of them by a numerical simulation
| Project/Area Number |
20K05366
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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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| Review Section |
Basic Section 30020:Optical engineering and photon science-related
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| Research Institution | Tokai University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | アルカリレーザー / DPAL / セシウム / 反応レート / レート方程式 / Cs / ガスレーザー / レーザー誘起蛍光法 |
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| Outline of Final Research Achievements |
We have measured the reaction cross sections of the most fundamental reactions of the diode-pumped alkali laser (DPAL), i.e., the collisional relaxation reaction and the quenching reaction between Cs and three types of buffer gases, CH4, C2H6, and C3H8. As a result, six reaction cross sections for three buffer gases were obtained. Laser oscillation experiments were then performed with the three buffer gases, and the results were compared with the simulation results using the measured reaction cross sections. The results were in good agreement, confirming the accuracy of the measurement results. An analytical solution for the relationship between DPAL buffer gas partial pressure and laser power was derived and compared with the experimental results. The analytical solution represented the experimental results well.
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| Free Research Field |
レーザー発振器，光共振器，レーザー加工
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| Academic Significance and Societal Importance of the Research Achievements |
Csとバッファガスの反応速度定数は，今まで驚くほど測定結果の報告が少なかった．本研究により，Cs DPALの理論的研究に必要な6個の測定結果が出そろったことは意義深い．特に，CsとC3H8の間の失活反応断面積は今回初めて得られたものである．また，DPALのレート方程式に，特定の条件下では解析解が存在し，解析解が実験結果をよく表せることを初めて示したのは特筆すべき成果である．得られた反応断面積は，今後他のDPAL研究で広く用いられるものである．また，DPALの解析解は，反応断面積を計測する簡便な方法として応用可能である．
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