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Ultrasensitive detection of photothermal signal of thin films by using an optical amplification system

A simple optical amplification system is introduced to improve the sensitivity of both the photothermal deflection detection scheme and the surface thermal lensing technique. Model calculations and experimental data show that the photothermal signals can be easily amplified by more than an order of magnitude and that the technique can be readily applied to weak absorption measurements for optical thin film coatings.