SYMPOSIA PAPER Published: 01 January 1988

A Model for Probing Small Absorption Changes During Multiple Pulse Laser-Induced Damage


A sensitive technique for the detection of temperature changes in the bulk of a transparent material due to absorption of any laser beam is the thermal-lensing technique. So far to our knowledge the thermal-lensing models will yield zero signal, if one probes the temperature changes in the space where the laser beam focuses. We developed a model that uses a low power c.w. laser to detect the absorption changes in the focal volume of a Q-switched laser beam. The change in the absorption from pulse to pulse will be detected as a change in the far field intensity profile of the c.w. beam; taking in account the aberrant nature of the induced thermal-lens, an expression for the above profile is given; the far field fractional axial intensity is derived without any high order terms elimination, which allows for an accurate and sensitive measurement of the absorption coefficient for one and n-photon absorption processes.

Author Information

Kitriotis, D
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Developed by Committee: F01
Pages: 649–656
DOI: 10.1520/STP18602S
ISBN-EB: 978-0-8031-5032-4
ISBN-13: 978-0-8031-4477-4