레이저 출력 세기에 따른 난류 모사 위상판 측정 = Measurement of a Phase Plate Simulates Atmospheric Turbulence Depending on Laser-power Intensity

다국어 초록 (Multilingual Abstract)

The performance of astronomical telescopes can be negatively affected by atmospheric turbulence. To address this issue, techniques for atmospheric turbulence correction have been developed, requiring the simulation of atmospheric turbulence in the laboratory. The most practical way to simulateatmospheric turbulence is through the use of a phase plate. When measuring a phase plate that simulates strong turbulence, a Shack-Hartmann wavefront sensor is commonly used. However, laser power decreases as it passes through the phase plate, potentially leading to a weak laser signal at the sensor. This paper investigates the need to control laser-power intensity when measuring a phase plate that simulates strong atmospheric turbulence, and examines the effects of laser-power intensity on the measured wavefront. For phase plates with relatively high Fried parameter r 0 , the laserpower intensity causes a variation of over 10% in r 0 . For phase plates with relatively low r 0 , the laser-power intensity causes a variation of less than5%, which means that the influence of laser-power intensity is negligible for phase plates that simulate strong atmospheric turbulence. Based on thesystem described in this paper, a phase plate simulating strong atmospheric turbulence can be measured with a laser-power intensity of 5 mW or higher. Therefore, controlling the laser’s output power is necessary when measuring a phase plate for simulating atmospheric turbulence, especially for phase plates with low r 0 values.