Journal
OPTICS LETTERS
Volume 40, Issue 19, Pages 4492-4495Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.40.004492
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Funding
- National Research Foundation-Prime Minister's office, Republic of Singapore (NRF) [NMRC/EDG/1062/2012]
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This article describes a laser-shared photothermal system that achieves tight temperature regulation by frequency-domain photoacoustic (FD-PA) feedback. To this end, a continuous-wave laser system was designed with arbitrarily modulatable laser intensity. And, by fast alternating in the time domain between a constant laser intensity for photothermal heating and a modulated laser intensity for FD-PA temperature measurement, photothermal temperature variations are captured by FD-PA in real time. A proportional-integral-derivative (PID) controller monitors the feedback from FD-PA measurements and controls photothermal heating dose accordingly, thus stabilizing the temperature at preset values. The proposed system is demonstrated to achieve ultrafast temperature measurement at a 4 kHz rate, and with proper averaging, the measurement and regulation accuracy are 0.75 deg and 0.9 deg respectively. (C) 2015 Optical Society of America
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