Spectroscopic second and third harmonic generation microscopy using a femtosecond laser source in the third near-infrared (NIR-III) optical window

In open publications the results of research on the third harmonic generation in the air by femtosecond laser radiation are presented. Most of the studies have been carried out using a titanium-sapphire laser with a central emission wavelength of 800 nm. This work presents for the first time the results of studies of the third harmonic generation in the air from laser radiation with a wavelength of 1032 nm. The source of the laser radiation was an ytterbium femtosecond laser which generated pulses with duration of ~ 250 fs and a repetition rate of 1 kHz. The average output power of the laser reached 1750 mW. Maximum peak intensity of excitation laser radiation was up to 10 TW/cm2. When focusing the laser radiation its filamentation took place and was accompanied by generation of the third harmonic radiation at wavelength of 344 nm. Spectral, energy and spatial characteristics of the generated third harmonic radiation were investigated. Energy measurements were carried out up to the threshold power of pump radiation at which the competing nonlinear processes in the circuit optical elements of the experimental setup began to occur. The maximum average third harmonic emission power was 1.52 mW with a third harmonic conversion efficiency of about 0.085 %. The far-field beam pattern had a symmetric Gaussian profile with a radiation divergence of 0.11 mrad which corresponds to the diffraction quality of the beam (M2 ≈ 1)

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Quantitative characterization of aqueous solutions probed by the third-harmonic generation microscopy

Journal of Structural Biology ◽

10.1016/j.jsb.2003.10.015 ◽

2004 ◽

Vol 147 (1) ◽

pp. 42-49 ◽

Cited By ~ 20

Author(s):

V. Shcheslavskiy ◽

G.I. Petrov ◽

S. Saltiel ◽

V.V. Yakovlev

Keyword(s):

Aqueous Solutions ◽

Harmonic Generation ◽

Third Harmonic Generation ◽

Quantitative Characterization ◽

Third Harmonic ◽

The Third ◽

Third Harmonic Generation Microscopy

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Evolution of a femtosecond laser-induced plasma and energy transfer processes in a SiO2 microvolume detected by the third harmonic generation technique

JETP Letters ◽

10.1134/s0021364009160085 ◽

2009 ◽

Vol 90 (4) ◽

pp. 263-267 ◽

Cited By ~ 13

Author(s):

V. M. Gordienko ◽

F. V. Potemkin ◽

P. M. Mikheev

Keyword(s):

Energy Transfer ◽

Femtosecond Laser ◽

Harmonic Generation ◽

Third Harmonic Generation ◽

Third Harmonic ◽

Laser Induced Plasma ◽

The Third ◽

Generation Technique ◽

Transfer Processes

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Ultrafast Third-Order Nonlinear Optical Response Excited by fs Laser Pulses at 1550 nm in GaN Crystals

Materials ◽

10.3390/ma14123194 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3194

Author(s):

Adrian Petris ◽

Petronela Gheorghe ◽

Tudor Braniste ◽

Ion Tiginyanu

Keyword(s):

Harmonic Generation ◽

Nonlinear Optical ◽

Laser Pulses ◽

Third Harmonic Generation ◽

High Repetition Rate ◽

Third Order ◽

Third Harmonic ◽

The Third ◽

High Repetition ◽

Gan Crystal

The ultrafast third-order optical nonlinearity of c-plane GaN crystal, excited by ultrashort (fs) high-repetition-rate laser pulses at 1550 nm, wavelength important for optical communications, is investigated for the first time by optical third-harmonic generation in non-phase-matching conditions. As the thermo-optic effect that can arise in the sample by cumulative thermal effects induced by high-repetition-rate laser pulses cannot be responsible for the third-harmonic generation, the ultrafast nonlinear optical effect of solely electronic origin is the only one involved in this process. The third-order nonlinear optical susceptibility of GaN crystal responsible for the third-harmonic generation process, an important indicative parameter for the potential use of this material in ultrafast photonic functionalities, is determined.

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