Operation of an f/5 thermal-defocusing/scattering optical limiter is described. Thermal-defocusing limiting of 6-ns-duration, 532-nm laser pulses occurs by use of the broadband-absorbing dye Nigrosin dissolved in carbon disulfide. Additional limiting due to thermally induced scattering occurs at high incident fluences (above a threshold fluence) when either surface-roughened BASF-1 glass windows are in contact with the dye solution or microscopic glass fibers are added to the liquid cell. Limiter figures of merit are improved by factors of 2 and 4, respectively, over that of a purely thermal-defocusing limiter.
© 1994 Optical Society of America
Original Manuscript: November 29, 1993
Published: May 1, 1994
B. L. Justus, A. J. Campillo, and A. L. Huston, "Thermal-defocusing/scattering optical limiter," Opt. Lett. 19, 673-675 (1994)