Optical limiting properties of J-type dimeric phthalocyanine Cu and optical switching based on spatial self-phase modulation

Mikhail S. Savelyev; Pavel N. Vasilevsky; Alexander Yu. Gerasimenko; Alexander Yu. Tolbin

doi:10.1117/12.2592396

18 April 2021 Optical limiting properties of J-type dimeric phthalocyanine Cu and optical switching based on spatial self-phase modulation

Mikhail S. Savelyev, Pavel N. Vasilevsky, Alexander Yu. Gerasimenko, Alexander Yu. Tolbin

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Proceedings Volume 11770, Nonlinear Optics and Applications XII; 117701W (2021) https://doi.org/10.1117/12.2592396
Event: SPIE Optics + Optoelectronics, 2021, Online Only

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Abstract

In this study, J-type dimeric copper phthalocyanine in dimethylformamide (DMF) was investigated to show strong nonlinear absorption due to the reverse saturable absorption (RSA) under single nanosecond pulses (16 ns at a wavelength of 532 nm), which significantly exceeds the lifetimes of excited states. In the case of a femtosecond laser, the effect of spatial self-phase modulation was observed, with no contribution from nonlinear absorption being found. The only linear absorption was detected under pulses of 140 fs at a wavelength of 790 nm. The femtosecond pulse repetition rate was 80 MHz which corresponds to a delay between single pulses of about 12.5 ns. Both analytical wavelengths used were outside the intense absorption region (Q- and B- bands) of J-type dimeric copper phthalocyanine in the UV/Vis/NIR spectrum. In the case of femtosecond laser radiation, a sufficient population of excited states was not achieved due to the low peak fluence (~ 0.03 mJ/cm²). For the single nanosecond pulses, the threshold fluence density was ca. 30 mJ/cm². In the switch circuit, such material should be placed horizontally to exclude asymmetric thermal convection resulting from the gravity effect.

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Mikhail S. Savelyev, Pavel N. Vasilevsky, Alexander Yu. Gerasimenko, and Alexander Yu. Tolbin "Optical limiting properties of J-type dimeric phthalocyanine Cu and optical switching based on spatial self-phase modulation", Proc. SPIE 11770, Nonlinear Optics and Applications XII, 117701W (18 April 2021); https://doi.org/10.1117/12.2592396

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