The attenuation coefficient of a pulsed laser beam in water is investigated experimentally. It is found that the attenuation coefficient is dependent on the pulse energy and the linewidth of the laser, rather than a constant. The attenuation coefficient for a narrow linewidth laser can exceed that of a broad linewidth laser due to stimulated Brillouin scattering when the laser intensity is larger than a certain value. A theoretical analysis is provided.
© 2007 Optical Society of America
Atmospheric and Oceanic Optics
Original Manuscript: April 17, 2007
Revised Manuscript: August 12, 2007
Manuscript Accepted: August 16, 2007
Published: September 19, 2007
Jianhui Bai, Juan Liu, Yi Huang, Yinan Liu, Lu Sun, Dahe Liu, and E. S. Fry, "Investigations of the attenuation coefficient of a narrow-bandwidth pulsed laser beam in water," Appl. Opt. 46, 6804-6808 (2007)