Laser-induced surface thermal lensing for thin film characterizations

Zhouling Wu; Pao-Kuang Kuo; Y. S. Lu; S. T. Gu

doi:10.1117/12.240357

27 May 1996 Laser-induced surface thermal lensing for thin film characterizations

Zhouling Wu, Pao-Kuang Kuo, Y. S. Lu, S. T. Gu

Proceedings Volume 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995; (1996) https://doi.org/10.1117/12.240357
Event: Laser-Induced Damage in Optical Materials: 1995, 1995, Boulder, CO, United States

Abstract

Laser-induced surface deformation is a widely used technique for studying thin film coatings. In this technique the deformation is typically detected by using the well-known optical beam deflection technique. In this paper we report a different technique in studying the deformation by using optical diffraction effect. In this detection scheme the laser-induced thermal bump behaves as a curved reflection mirror which can either focus or defocus a second probe laser beam through optical diffraction, depending on the specific geometry used. This surface thermal lensing effect is demonstrated to be a sensitive and easy-to-handle method for thin film characterization. The potentials of this technique and its advantages over the conventional method for thin film absorption measurement and defect characterization are discussed.

Citation Download Citation

Zhouling Wu, Pao-Kuang Kuo, Y. S. Lu, and S. T. Gu "Laser-induced surface thermal lensing for thin film characterizations", Proc. SPIE 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995, (27 May 1996); https://doi.org/10.1117/12.240357

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