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%.
© 1992 Optical Society of America
Original Manuscript: September 14, 1990
Published: February 1, 1992
Valerie E. Anderson, Nigel P. Fox, and David H. Nettleton, "Highly stable, monochromatic and tunable optical radiation source and its application to high accuracy spectrophotometry," Appl. Opt. 31, 536-545 (1992)