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Optical transmittance measurement system for coated elements with low transmittance
Hongyun Wang1, Zhengshang Da, Lili Liu
1The Advanced Optical Instrument Research Department, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, China.
Applied Optics
|May 23, 2012
Summary
A new metrology system accurately measures transmittance for high-power laser optics. This system uses uncoated wedged glasses for precise, reliable performance validation of optical elements.
Area of Science:
- Optics and Photonics
- Laser Technology
- Metrology
Background:
- High-power laser facilities require optical elements with stringent transmittance specifications.
- Validating optic performance against these specifications is crucial for facility operation.
- Existing metrology systems may face limitations with large-aperture or coated elements.
Purpose of the Study:
- To propose and validate a novel metrology system for accurate transmittance measurement.
- To address the need for precise performance validation of low-transmittance optical elements.
- To develop a system suitable for large-aperture elements in high-power laser applications.
Main Methods:
- A relative measurement method employing uncoated wedged glasses as beam splitters and attenuators.
- Utilizing surface reflectivity of uncoated glass as a reference for transmittance comparison.
- Integration of a laser source, integrating sphere, and power meter for data acquisition.
Main Results:
- Demonstrated a relative standard uncertainty (σ(T)/T) of 0.424% in transmittance measurements.
- The system effectively avoids coating errors by using uncoated optics.
- The proposed method allows for proper attenuation of beam powers for accurate comparison.
Conclusions:
- The developed metrology system provides a reliable and accurate method for transmittance measurement.
- The system is particularly advantageous for large-aperture optical elements.
- This approach enhances the validation process for critical components in high-power laser facilities.
