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Proceedings Paper

Observation of temporary degeneration of material transmittance under strong laser irradiation
Author(s): Chengwu An; Kok Leong Ler; Yuan Yuan; Yeow Whatt Goh; Minghui Hong; Yongfeng Lu
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Paper Abstract

Laser induced temporary degeneration of transmissivity in optical materials has been observed under strong laser irradiation. In the experiment, a green light laser beam was focused onto a transparent sample, an ultra fast photo-tube was used to detect the laser signals behind the sample, an oscilloscope was used to record the amplitude change of the signals. When the laser power density on the sample increases to some levels, the detected signal starts to decrease relatively, which means the transmissivity of the sample commences to degenerate. In this case, if the laser power density is reduced back a little bit, the transmittance of the sample can restore. This means that the degeneration of the transmittance is temporary. When the laser power density increases further more after the degeneration has commenced, damage to the material will happen. Therefore, there is a transition course in material before it is damaged. The transition course is from the beginning of transmittance degeneration to damage rising. The influence of laser repetition rate on the damage formation has been also investigated.

Paper Details

Date Published: 25 February 2002
PDF: 4 pages
Proc. SPIE 4426, Second International Symposium on Laser Precision Microfabrication, (25 February 2002); doi: 10.1117/12.456862
Show Author Affiliations
Chengwu An, Data Storage Institute (Singapore)
Kok Leong Ler, Data Storage Institute (Singapore)
Yuan Yuan, Data Storage Institute (Singapore)
Yeow Whatt Goh, Data Storage Institute (Singapore)
Minghui Hong, Data Storage Institute (Singapore)
Yongfeng Lu, Data Storage Institute (United States)

Published in SPIE Proceedings Vol. 4426:
Second International Symposium on Laser Precision Microfabrication
Isamu Miyamoto; Yong Feng Lu; Koji Sugioka; Jan J. Dubowski, Editor(s)

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