Liquid crystal fiber array for optical limiting of laser pulses

Details Liquid crystal fiber array for optical limiting of laser pulses Liquid crystal fiber array for optical limiting of laser pulses

1995-04-05

1996-12-31

Wu, Shean C.

Compositions

Liquid crystal compositions

385143, 2522991, 349 62, C09K 1900, G02F 113, G02B 600

Patent

active

055891012

ABSTRACT:
A protective liquid crystal fiber array includes a body having a plurality of capillary passages extending between incident and transmitting faces. A liquid phase, liquid crystal material is positioned in each of the capillaries and optically transparent closures are positioned on the incident and transmitting faces to retain the liquid phase liquid crystal material within the capillaries. The liquid crystal material is substantially transparent at low levels of optical energy, which at high levels of incident optical energy, exhibits an optical limiting effect as a result of a negative change in its refractive index. The change in refractive index is enhanced as a result of thermal density effects due to the restriction of the incident optical energy within the diameter of one or more capillaries.

REFERENCES:
patent: 4765719 (1988-08-01), Fergason
patent: 5361320 (1994-11-01), Liu et al.
I.C. Khoo et al., "Isotropic Liquid Crystalline Film and Fiber Structures For Optical Limiting Application", Int. Journal of Nonlinear Optical Physics, vol. 2, No. 4, (1993) pp. 559-575.
I.C. Khoo, "Observation of Optical Limiting and Backscattering of Nanosecond Laser Pulses in Liquid-Crystal Fibers", Optics Letters, vol. 19, No. 8, Apr. 15, 1994, pp. 530-532.
I.C. Khoo et al., "Nonlinear Optical Propagation and Self-Limiting Effect In Liquid-Crystaline Fibers", Appl. Phys. B59, (1994) pp. 573-580.

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