Investigation of Nonlinear Optical Processes in Mercury Sulfide Quantum Dots
Vyacheslav V. KimLaboratory of Nonlinear Optics, University of Latvia, Jelgavas 3, LV-1004 Riga, LatviaIvan A. ShuklovMoscow Institute of Physics and Technology, National Research University, 141701 Dolgoprudny, RussiaAlaa A. MardiniMoscow Institute of Physics and Technology, National Research University, 141701 Dolgoprudny, RussiaArturs BundulisInstitute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, LatviaA. I. ZvyaginDepartment of Physics, Voronezh State University, 394006 Voronezh, RussiaRawda KholanyMoscow Institute of Physics and Technology, National Research University, 141701 Dolgoprudny, RussiaAnna A. LizunovaMoscow Institute of Physics and Technology, National Research University, 141701 Dolgoprudny, RussiaJurǵis GrūbeInstitute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, LatviaAnatolijs ŠarakovskisInstitute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, LatviaO. V. OvchinnikovDepartment of Physics, Voronezh State University, 394006 Voronezh, RussiaR. A. GaneevDepartment of Physics, Voronezh State University, 394006 Voronezh, Russia
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Аннотация
The authors report the third-harmonic generation, nonlinear refraction, and nonlinear absorption in HgS quantum dot (QD) suspensions and films using the nanosecond and femtosecond pulses. High conversion efficiency (7 × 10−4) towards the third harmonic (TH) of the 900–1700 nm, 150 fs laser in the thin (70 nm) films containing HgS QDs deposited on the glass substrates is obtained. The authors analyze spectral dependencies of the TH, nonlinear refractive indices, and nonlinear absorption coefficients of QDs in the 500–1700 nm range and discuss the relation between the TH process and the low-order nonlinear optical properties of these quantum dots.
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