Abstract
Measurement of the local temperature in transparent materials
irradiated by femtosecond laser pulses is important for deep insight
into light–matter interaction physics and for proper laser
micronanomachining, which is, however, technically challenging. We
solve the problem in this paper by using a femtosecond laser-written
fiber Bragg grating that can stably work up to 1000°C as a
high-sensitivity temperature sensor to monitor the thermal effect.
The peak temperature of the thermal impulse is estimated as around
4800°C, which decays to around 500°C in the pulse
interval for irradiation of 1.1 mJ under repetition rate of 1 kHz
under 40 mm lens focusing.
© 2011 IEEE
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