We report optical limiting of single 532-nm 6-ns laser pulses by two coupled optical cavities with a PT-symmetric spectrum of reflectionless modes at fluences above 10 mJ/cm2. The optical limiting is related to broken PT symmetry due to light-induced changes in one of the cavities. At the limiting threshold, the optical limiter quickly becomes highly reflective rather than absorbing, thereby protecting itself from laser-induced damage.
Optical Limiters Based on PT-Symmetry Breaking of Reflectionless Modes / Riboli F.; Kononchuk R.; Tommasi F.; Boschetti A.; Suwunnarat S.; Anisimov I.; Vitebskiy I.; Wiersma D.S.; Cavalieri S.; Kottos T.; Chabanov A.A.. - ELETTRONICO. - (2024), pp. 0-0. (Intervento presentato al convegno 2024 Conference on Lasers and Electro-Optics, CLEO 2024 tenutosi a usa nel 2024) [10.1364/cleo_si.2024.sf3j.2].
Optical Limiters Based on PT-Symmetry Breaking of Reflectionless Modes
Riboli F.;Tommasi F.;Wiersma D. S.;Cavalieri S.;
2024
Abstract
We report optical limiting of single 532-nm 6-ns laser pulses by two coupled optical cavities with a PT-symmetric spectrum of reflectionless modes at fluences above 10 mJ/cm2. The optical limiting is related to broken PT symmetry due to light-induced changes in one of the cavities. At the limiting threshold, the optical limiter quickly becomes highly reflective rather than absorbing, thereby protecting itself from laser-induced damage.
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