Observation of temporary degeneration of material transmittance under strong laser irradiation

Chengwu An; Kok Leong Ler; Yuan Yuan; Yeow Whatt Goh; Minghui Hong; Yongfeng Lu

doi:10.1117/12.456862

25 February 2002 Observation of temporary degeneration of material transmittance under strong laser irradiation

Chengwu An, Kok Leong Ler, Yuan Yuan, Yeow Whatt Goh, Minghui Hong, Yongfeng Lu

Proceedings Volume 4426, Second International Symposium on Laser Precision Microfabrication; (2002) https://doi.org/10.1117/12.456862
Event: Second International Symposium on Laser Precision Micromachining, 2001, Singapore, Singapore

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.

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Chengwu An, Kok Leong Ler, Yuan Yuan, Yeow Whatt Goh, Minghui Hong, and Yongfeng Lu "Observation of temporary degeneration of material transmittance under strong laser irradiation", Proc. SPIE 4426, Second International Symposium on Laser Precision Microfabrication, (25 February 2002); https://doi.org/10.1117/12.456862

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KEYWORDS

Transmittance

Pulsed laser operation

Signal detection

Transparency

Positron emission tomography

Laser irradiation

Glasses

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