Journal
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Volume 527, Issue -, Pages 109-118Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15421406.2010.486708
Keywords
All-optical switching; birefringence; microseconds; nanoseconds; order-disorder; visible - infrared lasers
Funding
- Air Force Office of Scientific Research
- Army Research Office
- National Science Foundation Material Research Science and Engineering Center [DMR-0820404]
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Laser induced disorder is an efficient and very fast mechanism to induce changes in the birefringence of nematic liquid crystals, which in turn enable many nonlinear optical processes. Using a 90-degrees twist alignment nematic liquid crystal doped with suitable dye to impart the required photonic absorption and order parameter modulation, we have demonstrated ultrafast all-optical shuttle operation for lasers spanning the visible to near-infrared spectral region (532nm; 488nm; 750nm; 1060nm; 1550nm). With increasing intensity, the on-time of the switch decreases from microseconds to the nanoseconds regime, in such a manner that the transmitted light energy/intensity is clamped to below the eye- or sensor-safe levels.
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