Relaxation of the optical density of glass modulated with bichromatic radiation

Balakirev, M. K.; Vostrikova, L. I.; Смирнов, В. А.; Éntin, M. V.

doi:10.1134/1.567000

Cited by 20 publications

(9 citation statements)

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“…For comparison with the experimental data we applied a least-square fit using the exponential growth function as given in [33], f (t) = a 1+(Rt 0 −1) e −2t R , where a, t 0 and R are fit parameters. In this expression, a is the steady-state value, t 0 is the delay time and R quantifies the growth rate of the SH output, i.e., the steepness of the slope at the moment that the output reaches a 1/e-fraction of the steady-state value.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

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Photo-induced second-order nonlinearity in stoichiometric silicon nitride waveguides

et al. 2017

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Abstract:We report the observation of second-harmonic generation (SHG) in stoichiometric silicon nitride waveguides grown via low-pressure chemical vapor deposition (LPCVD). Quasirectangular waveguides with a large cross section were used, with a height of 1 µm and various different widths, from 0.6 to 1.2 µm, and with various lengths from 22 to 74 mm. Using a mode-locked laser delivering 6-ps pulses at 1064 nm wavelength with a repetition rate of 20 MHz, 15% of the incoming power was coupled through the waveguide, making maximum average powers of up to 15 mW available in the waveguide depending on the waveguide cross section. Second-harmonic output was observed with a delay of minutes to several hours after the initial turn-on of pump radiation, showing a fast growth rate between 10 −4 to 10 −2 s −1 , with the shortest delay and highest growth rate at the highest input power. After this first, initial build-up (observed delay and growth), the second-harmonic became generated instantly with each new turn-on of the pump laser power. Phase matching was found to be present independent of the used waveguide width, although the latter changes the fundamental and second-harmonic phase velocities. We address the presence of a second-order nonlinearity and phase matching, involving an initial, power-dependent build-up, to the coherent photogalvanic effect. The effect, via the third-order nonlinearity and multiphoton absorption leads to a spatially patterned charge separation, which generates a spatially periodic, semi-permanent, DC-field-induced second-order susceptibility with a period that is appropriate for quasi-phase matching. The maximum measured second-harmonic conversion efficiency amounts to 0.4% in a waveguide with 0.9 × 1 µm 2 cross section and 36 mm length, corresponding to 53 µW at 532 nm with 13 mW of IR input coupled into the waveguide. The maximum equivalent χ (2) -susceptibility amounts to 3.7 pm/V, as retrieved from the measured conversion efficiency.

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Section: Experimental Procedures and Resultsmentioning

confidence: 99%

“…3(a)-3(e). The temporal fit function was derived by Balakirev et al [33] for the CPGE in glass. The first observations of the CPGE in guided optics were made with phosphor-doped silica fibers [29,30,[36][37][38] and several phenomenological models were proposed [33,[39][40][41][42].…”

Section: Discussionmentioning

confidence: 99%

Photo-induced second-order nonlinearity in stoichiometric silicon nitride waveguides

et al. 2017

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“…[1][2][3][4]. Usually this effect is called optical poling and the first explanations were based on the light induced self-organization of the excited dipole moments [5] or taking into account of photogalvanic effect [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Photoinduced nonlinear optical effects in the Pr doped BiB3O6 glass nanoparticles incorporated into the polymer matrices

Majchrowski

Ebothé

Gondek

et al. 2009

Journal of Alloys and Compounds

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“…The process of the writing of grating was completely reversible, and no structural changes were observed in the glasses during our experiments. The kinetics of the writing and relaxation of the photorefractive gratings upon the OP of glasses is described in detail in our paper 13 . We have chosen in experiment the angle α between the incident beams in such a way that the grating Δn was oriented at the Bragg's angle with respect to the incident beam of the fundamental frequency mm Z, MM 10 photorefractive grating Δn in glass was observed for the incident light with the fundamental frequency.…”

Section: Resultsmentioning

confidence: 99%

Photo-refractive Bragg gratings in center-symmetrical materials

Smirnov

Vostrikova

2014

SPIE Proceedings

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The processes and the properties of the creation of the photo-refractive Bragg gratings in center-symmetrical materials by considering of the coherent interactions of the laser radiations have been analyzed. Characteristic experimental results of the scattering and the diffraction of light on photo-refractive Bragg gratings in volumetric glass materials are considered and the possible mechanisms of the observed and investigated processes are discussed.

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Relaxation of the optical density of glass modulated with bichromatic radiation

Cited by 20 publications

References 1 publication

Photo-induced second-order nonlinearity in stoichiometric silicon nitride waveguides

Photo-induced second-order nonlinearity in stoichiometric silicon nitride waveguides

Photoinduced nonlinear optical effects in the Pr doped BiB3O6 glass nanoparticles incorporated into the polymer matrices

Photo-refractive Bragg gratings in center-symmetrical materials

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