Development of calibration technique of image sensors toward realization of imaging power meter for high power lasers

2014 Fiscal Year Final Research Report

• Project/Area Number: 24760327
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Measurement engineering
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: NUMATA TAKAYUKI 独立行政法人産業技術総合研究所, 計測標準研究部門, 主任研究員 (60420288)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: レーザ / 感度 / プロファイラ / CCD / 近赤外 / 高出力 / 光減衰器 / 均一性

Outline of Final Research Achievements

Responsivity evaluation technique of CCD image sensors and an optical attenuation method applicable for high power lasers were developed to realize an image sensor-based laser power meter. Investigation of pixel to pixel uniformity of responsivity of Si-CCD sensors revealed strong dependence on exposure time and laser wavelength. Proposed optical attenuator utilizing re-coupling of evanescent wave allowed attenuation of 10 W, φ3 mm laser beam down below -70 dB being easily controllable with the gap between two prisms. Incident beam profile was saved through the strong attenuation process. The attenuator and sensitivity-evaluated CCD were assembled to construct the imaging power meter and applied to laser power measurement.

Free Research Field

レーザ放射計測