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Research and Preparation of Optical Coatings Used in Pulse CO2 Laser

Author: YangChunHua
Tutor: ChengZuHai；XiaWenJian
School: Huazhong University of Science and Technology
Course: Physical Electronics
Keywords: High power TEA CO2 laser Film design Laser damage Composite monitor
CLC: O484.41
Type: Master's thesis
Year: 2007
Downloads: 93
Quote: 0
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Abstract


In a high-energy pulse TEA CO2 laser system , the performance of the optical thin film is the key technical problems that limit the laser power increased and improved beam quality . Used for high power CO2 laser resonator mirror , the full anti-reflection film and used as a window , the anti-reflection film , a partially reflective film coating design and plated , to study the mechanism of film damage and the high energy laser . From the thermal conductivity of the material , the absorption and the coefficient of thermal expansion to start , select the appropriate base material and the window of the reflecting mirror substrate material . Needle optimized design method , considering the internal electric field intensity distribution of high - power laser systems , optical film , design a high damage threshold film thickness tolerances larger membrane system . Film coating system monitoring method of optical thin films , and proposed a new method of monitoring - composite monitor , the upcoming crystal monitor and extreme value method optical monitoring two monitoring methods composite . The method utilizes the good crystal monitor linearity correction optical monitoring in the stop -plated point , is very suitable for using visible light monitoring long wavelength infrared optical film deposition , even if the failure of the crystal can still adopt positive Methods of Monitoring to ensure that the thin - film coating system successfully . In the the INNOTEC company ES-26CB coating machine using ion - assisted deposition processes , coating TEA CO2 laser enhanced protection mirror reflective GaAs laser window , ZnSe antireflection film . Nicolet FT-IR infrared spectrophotometer tests show that the coating film can meet the design requirements , and achieved good results in practical applications . This paper analyzes the high-energy laser and optical film interaction mechanism simulation calculation of a pulsed laser - induced film temperature field and stress field distribution investigate the affect the optical film damage threshold value technology factors , for improved coating process , improve the optical film of laser damage threshold value great significance .

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Thin Film Physics > The nature of the films > Optical Properties
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