Simulations of far-field optical transmission properties influence by mirror thermal deformation for high-power pulsed transversely excited atmospheric CO2 with unstable resonator
| Autor: | Ruhai Guo Ruhai Guo, Xudong Han Xudong Han |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Diffraction
Materials science Zernike polynomials business.industry Near and far field Deformation (meteorology) Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Angular spectrum method symbols.namesake Resonator Quality (physics) Optics symbols Electrical and Electronic Engineering business Beam (structure) |
| Zdroj: | Chinese Optics Letters. 12:S21406 |
| ISSN: | 1671-7694 |
| Popis: | In order to research the influence on the beam transmission properties due to the different time intervals in the high-power pulsed transversely excited atmospheric CO2 laser with unstable resonator, the finite element analysis of thermodynamics instantaneous method are adopted to analyze the mirror thermal deformation irradiated by the high-power laser beam. The mirror thermal deformation is fitted by Zernike polynomials. Then the angular spectrum propagation theory of diffraction is used to calculate the far-field transmission properties. The simulation results show that with the decrease in the time interval between each pulse, the mirror temperature and thermal deformation gradually increase, and peak power and the average energy density decrease, and beam broadens. With the 500 Hz repetition rate relative to the 10 Hz repetition, the peak intensity decreases almost 40%; the optical spot broadens about 60%. When the repetition rate is larger than 100 Hz, the surface of mirror will have obvious deformation, which will cause apparent degradation in the optical beam quality for the far-field transmission. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|