Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser materials and substances

Synthesis and Investigation of Al2O3 Based Films for Hollow Waveguide Application in CO2 Laser Delivery

Author WangZhou
Tutor ZhaoXiuJian
School Wuhan University of Technology
Course Materials Science
Keywords Alumina sol Coating process Czochralski method. Level rises law Hollow Fiber
Type Master's thesis
Year 2006
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Total reflection hollow-core fiber development is of great significance to develop CO 2 laser application in the field of laser medical laser processing. ATR type CO 2 laser hollow-core optical fiber materials synthesis technology CO 2 one of the key topics in the field of laser applications. This study to explore the sol - gel synthesis Al 2 O 3 based CO 2 laser hollow-core fiber reflective film materials process route coating process using the dip-coating method and the liquid level rises law. study of of alumina sol nature and dense alumina membrane preparation process, and finished optical fiber transmission loss test. Of aluminum sec-butoxide precursor, water as solvent, nitric acid as peptizers, ethyl acetoacetate (EAcAc) and polyvinyl pyrrolidone (PVP) as a modifier were prepared with different concentrations of alumina sol Czochralaski coating on flat glass and sheathed method, using the Czochralski method and the liquid level rose quartz capillary wall coating. The results showed that decreasing the thickness of the electrical double layer of the colloidal particles with the increase of the concentration of nitric acid in the nitric acid concentration of ASB: the HNO 3 = 1:0.3 (molar ratio), colloidal Zata potential and role potential maximum, alumina gel, as the temperature increases, the gel from γ-Al 2 O 3 turn to the δ-Al 2 O 3 2 the O 3 and α-Al 2 O 3 <θ-Al / sub> shift. In the preparation of excellent performance, suitable and fiber wall coating of alumina sol also Czochralski method and the liquid level rises law coating process parameters on the preparation of alumina film. The results showed that, when coated with the Czochralski method, reducing the pulling speed and to reduce the coating times conducive to prepare a film uniformly dense Al 2 O 3 , and the plate glass on the coating compared to the change of the heat treatment process and reduce the final heat treatment temperature can significantly improve the the quartz capillary wall coating cracking. Intermediate heat treatment temperature of 260 ° C, the final heat treatment temperature of 800 ° C for optimum heat treatment of the fiber coating. When the coating liquid level rise method, the liquid level rising speed of the impact on the film is small, with ASB: H 2 O = 1:80 (molar ratio) of the sol, after repeated coating, and ultimately may be The optical fiber on the inner wall of a thickness of 4.5μm dense aluminum oxide film, after CO 2 of the test of the transmission loss derived loss is 4dB / m. Comprehensive analysis of the Czochralski method, the liquid level rises law coating process, both dense and uniform alumina film, but by controlling the appropriate coating and heat treatment process can alumina membrane in the the level rises law prepared coating thickness and the transmission loss of the final test is superior coating process Czochralaski.

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