KEYWORDS: Calibration, Sensors, High power lasers, Laser systems engineering, Measurement uncertainty, Power meters, Optical alignment, Metrology, Design, Sensor calibration
This paper will present the newly developed high-power laser calibration system and alignment at the National Metrology Institute Thailand (NIMT). The system is composed of a high stability, high-power fiber laser with a wavelength of 1080 nm, as a laser source for calibration. Due to this wavelength is not visible to human eyes, the laser is equipped with a built-in red alignment laser and an automatic shutter that can be used for the routine alignment of the whole optical path. The method of calibration is in direct comparison using 2 beam samplers and 2 monitor power meters, for better accuracy. Two beam expanders are used to adjust the laser beam diameter. The reference power meter for calibration is a thermopile sensor. The optical characterization results of the reference power meter such as power non-linearity and detector surface non-uniformity, to be performed at the National Metrology Institute of Germany (PTB), will also be present.
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