Highly stable, monochromatic and tunable optical radiation source and its application to high accuracy spectrophotometry
- 1 February 1992
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 31 (4) , 536-545
- https://doi.org/10.1364/ao.31.000536
Abstract
An optical radiation source has been developed by coupling a dye laser to a small integrating sphere with an optical fiber. The radiant power from this source, which is monochromatic and spectrally tunable, has been stabilized to ±0.02%. Nonuniformities in the emitted optical radiation field caused by speckle have been overcome by vibrating the fiber at ultrasonic frequencies. The source has been successfully used in a spectrophotometer to measure the transmittance of a large lens with an uncertainty of ±0.01%, and the spectral responsivity of a filter radiometer with an uncertainty of ±0.04%.Keywords
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