65MHz bandwidth measurement of thermal emission induced by ArF excimer laser ablation of cornea

We measured thermal emission from cornea surface during and just after ArF excimer laser pulse with 65 MHz bandwidth, corresponding to 15 ns rise-time. The rise-time of the thermal emission measurement should be the same order of the heating pulse duration (ArF excimer laser pulse duration of 25 ns) to obtain the rapid temperature change of cornea surface. To acquire the available rise-time, we employed at 150 MHz cut off frequency photovoltaic HgCdTe detector with 100 MHz preamplifiers. We measured the peak temperature of 175 degrees Celsius at the fluence of 160 mJ/cm². The irradiated cornea temperature decreased rapidly with 280 ns in time constant. We measured the highest temperature elevation during the ArF excimer laser ablation of the cornea comparing with previous reports using our high speed temperature measurement system.