&lt;title&gt;Nanosecond lasers based on SRS with resonant excitation&lt;/title&gt;

Khulugurov, V. M.; Ivanov, N. A.; Oleynikov, Eugeniy A.

doi:10.1117/12.183095

Cited by 3 publications

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“…At certain conditions arised condensation of the spectrum generation of the wideband medium into one or several Raman lines. 4. In the cases with liquids Raman-converters at the certain amplification simulteneously excited some lines are due to of the scattering on the differents types of the molecular vibrations.…”

Section: Waveingth (Nm)mentioning

confidence: 97%

“…Fromthe position of the phenomenological theory the generation of the Stokes (or anti-Stokes )waves necessary to concider as a four-frequenced interaction, wich is discribed by third order in electric field in the decomposition of the polarization , the generation on frequences o a is result of the nonlinear summation of the three waves o (-Os and °-a P'1=E3 , (4) where 2' is the third-order nonlinear susceptibility, wich discribe iteraction and depend on the frequency. By changing of the working wave parameters possible to act upon another wave through nonlinear polarisation phase -matching condition realized:…”

Section: Theorymentioning

confidence: 99%

See 1 more Smart Citation

<title>Optical pump energy transformation in system with Raman converter and generated wideband medium</title>

Khulugurov

Ivanov

Oleynikov

1996

Nonlinear Frequency Generation and Conversion

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Processes of the optic pump energy transformation in system Raman converter -wideband laser medium with homogeneously broadening amplification band have been investigated. Raman converter and wideband medium were used in common cavity. As a Raman converter a barium nitrat and benzol were used, as a wideband media a LiF crystals with F or F2 color centrs and oxazyn-l were used. Thank to four-levels excitation scheme of the wideband media, pump output excitation threshold of them is less than for SRS excitation. In such system generation start from the wideband medium. The wideband medium amplify seeding radiation of the Raman converter at the Stokes frequences, which get to the amplification band of the wideband medium. Then, thank to additional Raman amplification, condensation of the wideband generation spectrum arise. Thus the threshold of the SRS excitation decreased and efficiency of the SRS increased in Stokes or anti-Stokes regions.Under certain conditions in liquid Raman media arised generation on the different types of the vibrations and generation on the combined frequences too.Stimulated Raman Scattering (SRS) widely used for control of the laser generation parametrs, transformation ofthe frequency, increase of the bright and others 1,2 Along with undoubted advantages of this method coherent radiation frequency transformation, in the wide spectral region from ultraviolet up to infrared , it have essential deficiences, in particular great pump thresholdes, that necessary focusing of the pump beams and SRS complicated by the cascade transformation into highest Stokes components. This deficiences essential complicate use of this method, moreover often do its use impossible. In our early papershave been shown possibility of the amplification of the weak coruning and contraruning SRS seed from the Ba(NO3) crystal by meanse of the LiF crystal with F color centers (CC), that allow reach of high efficiency ofthe trasformations pump energy into Stokes generation component without pump beam focusing.In this paper the transformation processes of the optic pump energy in the systems: Raman converterwideband electron-phonon medium have been investigated and mechanism ofthis effect was propoused. THEORYThe propagation of light waves in a medium is discribed by equation for electric field E .For simplification vector sign did't write. n2d2E -4n dP1 ----c-dt c dt where p -the nonlinear polarization, n -the refractive index , c -the velocity of light in vacuum. In our case electrical fild possible to discribe by the plane waves with slowly varying amplitudes and phases wich propogate along z -direction of the medium. E(z,t) = 1 / 2 E1 exp[i (Ic1 z -o t)] + 1 / 2 E exp[i (k z -co t)] + 2 +1/2 Ea e[i(k zi t)]+c.c., 468 ISPIE Vol. 2700 0-8194-2074-3196/$6.00 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/26/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Section: Waveingth (Nm)mentioning

confidence: 97%

Section: Theorymentioning

confidence: 99%