May 2023

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5 Reads

Journal of Applied Spectroscopy

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May 2023

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5 Reads

Journal of Applied Spectroscopy

October 2021

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15 Reads

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1 Citation

Proceedings of the National Academy of Sciences of Belarus Physics and Mathematics Series

Herein, on the basis of expressions for the refractive indices of isonormal waves, the possibility of performing collinear phase matching for optical parametric generation in arbitrary directions of a biaxial KTA crystal under pumping by radiation of a YAG:Nd laser is analyzed. The tuning curves that determine the tuning range of the signal and idler for type-I and II-type phase-matching and arbitrary angles θ and φ in cases where the tuning is carried out along the angle θ at a ﬁxed angle φ and vice versa are calculated. The eﬀective nonlinear coeﬃcient is determined. It is shown that their maximum value is achieved аt a polar angle θ = 90° and type-II phase-matching. For the case of generation of eye-safe radiation the spectral and angular phase matching widths were estimated, as well as gain widths of KTA-OPO under monochromatic pumping.

May 2020

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11 Reads

Journal of Applied Spectroscopy

Dependences of the resonance SRS efficiency on the pump radiation and medium scattering centers were theoretically analyzed. It was shown that this efficiency cannot be significant because the pump radiation and Stokes components were highly absorbed.

September 2019

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15 Reads

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4 Citations

Journal of Applied Spectroscopy

A system of equations describing stimulated resonance and spontaneous Raman scattering considering radiation impacts on scattering-center level populations was derived. The contribution of the resonant transition to the Raman gain coefficient was analyzed in the simplest case as a function of the resonance mismatch.

November 2018

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20 Reads

Proceedings of the National Academy of Sciences of Belarus Physics and Mathematics Series

May 2018

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80 Reads

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2 Citations

Journal of Applied Spectroscopy

We have developed a theory for a two-photon transition when the frequencies of the absorbed or emitted radiation are in resonance with transitions to the same intermediate level in the medium. We have determined the conditions under which such resonant two-photon transitions can play an important role.

November 2017

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19 Reads

Journal of Applied Spectroscopy

A system of equations is constructed for the power of the Stokes components generated individually or simultaneously by a steady-state Raman laser. Examples of lasing in one, two, or three components are used to show that these equations can be used in a simple way to optimize the operation of this type of laser system.

November 2016

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20 Reads

Journal of Applied Spectroscopy

A simple method for optimizing the parameters of ring optical parametric generator cavities is proposed. Expressions describing the threshold and efficiency of continuous wave generation as functions of the cavity parameters at the frequencies of the interacting waves are obtained. It is shown that the threshold is proportional to the product of the losses of interacting waves and that the generation efficiency as a function of the output mirror reflection coefficient for the signal wave has a maximum. The expressions determining the height and position of this maximum are given.

June 2016

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6 Reads

May 2016

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13 Reads

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1 Citation

Journal of Applied Spectroscopy

A simple method of accounting for transverse inhomogeneity of the pump and Stokes radiation beams in the description of stimulated Raman scattering (SRS) using intensity-transfer equations for interacting beams is proposed. Features of the method are illustrated using the calculated dependences of the Raman laser efficiency on the output mirror reflectivity and the pump pulse energy as examples.

... When a high-intensity laser irradiates a material molecule, photons are scattered into lower-frequency photons by two vibrational dynamic jumps, which drive the rapid growth of Stokes waves in the medium. At the same time, most of the pump energy is delivered to the Stokes wave [2][3][4]. Higher-order nonlinear effects, including the intra-pulse Raman effect, cannot be ignored for pulse widths less than 0.1 ps [5,6]. In the anomalous dispersion region of the fiber, optical solitons are generated due to the interaction of dispersion and nonlinear effects. ...

- Citing Article
September 2019

Journal of Applied Spectroscopy

... We start by considering a finite-difference model of an intracavity Raman laser, based on that in [24] and considered in several other works [25]- [29]. The equation relating the rate of change of the intracavity Stokes intensity I S with time t is ...

- Citing Article
July 2012

Laser Physics Letters

... where ܣ/1 is the normalised overlap integral of the Stokes and fundamental transverse intensity profiles (see e.g. [8,9]) 1 ܣ = ܫ ி ܫ ௌ ܣ݀ ܫ ி ܣ݀ ܫ ி ܣ݀ . (2.31) ܣ determines the power flow between the fields, and can be calculated from transverse profiles measured under lasing conditions. ...

- Citing Article
May 2010

Journal of Applied Spectroscopy

... Specifically, the generation band of the axial Stokes beam was shifted towards the high frequency side with respect to the generation band of the conical Stokes emission [23]. The frequency shift of the axial Stokes generation was also observed with respect to the Stokes generation excited by a Gaussian beam [24]. ...

- Citing Article
September 2009

Quantum Electronics