Monitoring of KrF excimer laser ablation for burn scars: a comparative study of transient reflection measurement and time-resolved photography of ablation plume

Akio Nakajima; Tsunenori Arai; Makoto Kikuchi; Akimi Iwaya; Katsuyuki Arai; Satoshi Inazaki; Takatsugu Takaoka; Masayoshi Kato

doi:10.1117/12.209897

22 May 1995 Monitoring of KrF excimer laser ablation for burn scars: a comparative study of transient reflection measurement and time-resolved photography of ablation plume

Akio Nakajima, Tsunenori Arai, Makoto Kikuchi, Akimi Iwaya, Katsuyuki Arai, Satoshi Inazaki, Takatsugu Takaoka, Masayoshi Kato

Author Affiliations +

Proceedings Volume 2391, Laser-Tissue Interaction VI; (1995) https://doi.org/10.1117/12.209897
Event: Photonics West '95, 1995, San Jose, CA, United States

Abstract

A simple laser ablation monitoring during burn scar removal by KrF laser irradiation was studied to control laser fluence in real-time. Because, to obtain suitable surface for auto skin-graft, the laser fluence should be precisely controlled at each laser shot. We employed simple probe transmission method which could detect ejected material/phenomena from irradiated surface. The time-course of measured probe intensity contained a couple of attenuated peaks, which might corresponded to a shock wave front and debris plume. The delay time from laser irradiation to the debris plume peak appearance varied with the ablation fluence. The delay time of 1 J/cm² (near ablation threshold) case prolonged 25% from 8 J/cm² (far above threshold) case. Therefore, we think the delay time measurement by means of the simple probe transmission method may be available to attain the laser fluence control for nonuniform burn scar removal. The time-resolved photography and probe reflection method were also studied to understand the measured time-course of the transmitted probe intensity.

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Akio Nakajima, Tsunenori Arai, Makoto Kikuchi, Akimi Iwaya, Katsuyuki Arai, Satoshi Inazaki, Takatsugu Takaoka, and Masayoshi Kato "Monitoring of KrF excimer laser ablation for burn scars: a comparative study of transient reflection measurement and time-resolved photography of ablation plume", Proc. SPIE 2391, Laser-Tissue Interaction VI, (22 May 1995); https://doi.org/10.1117/12.209897

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