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Nonlinear Absorption and Refraction of Picosecond and Femtosecond Pulses in HgTe Quantum Dot Films

Arturs BundulisInstitute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, LatviaIvan A. ShuklovMoscow Institute of Physics and Technology, National Research University, Dolgoprudny 141701, RussiaVyacheslav V. KimLaboratory of Nonlinear Optics, University of Latvia, Jelgavas 3, LV-1004 Riga, LatviaAlaa A. MardiniDepartment of Chemistry, Faculty of Science, Damascus University, Damascus P.O. Box 30621, SyriaJurǵis GrūbeInstitute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, LatviaJānis AlnisQuantum Optics Laboratory, Institute of Atomic Physics and Spectroscopy, University of Latvia, Jelgavas 3, LV-1004 Riga, LatviaAnna A. LizunovaMoscow Institute of Physics and Technology, National Research University, Dolgoprudny 141701, RussiaВ. Ф. РазумовInstitute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka 142432, RussiaR. A. GaneevDepartment of Physics, Voronezh State University, Voronezh 394006, Russia

2021en

ABI

Annotatsiya

We report measurements of the saturated intensities, saturable absorption, and nonlinear refraction in 70-nm thick films containing 4 nm HgTe quantum dots. We demonstrate strong nonlinear refraction and saturable absorption in the thin films using tunable picosecond and femtosecond pulses. Studies were carried out using tunable laser pulses in the range of 400–1100 nm. A significant variation of the nonlinear refraction along this spectral range was demonstrated. The maximal values of the nonlinear absorption coefficients and nonlinear refractive indices determined within the studied wavelength range were −2.4 × 10−5 cm2 W−1 (in the case of 28 ps, 700 nm probe pulses) and −3 × 10−9 cm2 W−1 (in the case of 28 ps, 400 nm probe pulses), respectively. Our studies show that HgTe quantum dots can be used in different fields e.g., as efficient emitters of high-order harmonics of ultrashort laser pulses or as laser mode-lockers.

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Identifikatorlar

DOI: 10.3390/nano11123351

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