Optical limiting of nanosecond and picosecond laser pulses through millimeter-length isotropic liquid-crystalcored fiber structures is reported. Low limiting threshold and clamped transmitted outputs are observed. The underlying nonlinear mechanisms are nonlinear photoabsorptions and scattering and lossy waveguiding caused by laser-induced thermal-density index fluctuations.
© 1996 Optical Society of America
I. C. Khoo, M. V. Wood, M. Lee, and Brett D. Guenther, "Nonlinear liquid-crystal fiber structures for passive optical limiting of short laser pulses," Opt. Lett. 21, 1625-1627 (1996)