Measurement and control of optical nonlinearities in dispersive dielectric multilayers
نویسندگان
چکیده
Dispersive dielectric multilayer mirrors, high-dispersion chirped mirrors in particular, are widely used modern ultrafast optics to manipulate spectral chirps of ultrashort laser pulses. routinely designed for dispersion compensation lasers and assumed be linear optical components. In this work, we report the experimental characterization an unexpectedly strong nonlinear response these mirrors. At modest peak intensities <2 TW/cm 2 —well below known laser-induced damage threshold structures—we observed a reflectivity decrease, local heating, transient modifications, time-dependent absorption incident pulse. Through computational analysis, found that field can enhanced by order magnitude layers structure. The enhancement leads wavelength-dependent absorption, shows no signs cumulative before catastrophic failure. is not simply two-photon process but instead likely mediated defects facilitate absorption. To mitigate issue, fabricated dispersive design strategically suppresses high-index layers, shifting high-field regions larger-bandgap, low-index layers. This strategy significantly increases maximum intensity mirror sustain. However, our finding onset even at ‘modest’ fluence has significant implications numerous past published works employing Additionally, results will guide future work design.
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ژورنال
عنوان ژورنال: Optics Express
سال: 2021
ISSN: ['1094-4087']
DOI: https://doi.org/10.1364/oe.409216