Four-photon-mixing-mediated stimulated Raman scattering in a multimode optical fiber

Sharma, Anup; Dokhanian, Mostafa; Wu, Zhixian; Williams, A. C.; Venkateswarlu, P.

doi:10.1364/ol.19.001122

Cited by 17 publications

(5 citation statements)

References 8 publications

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“…We observed that the shift is reversed if the input pump beam is aligned back with the center of the fiber core. Similar observations of the effect of the FWM processes on shifting the SRS spectrum have been reported by Sharma et al 17 ; they have shown that the cascaded Raman peaks can shift depending on which modes are excited by the pump laser.…”

supporting

confidence: 85%

Stimulated Raman scattering cascade spanning the wavelength range of 523 to 1750 nm using a graded-index multimode optical fiber

Pourbeyram¹,

Agrawal²,

Mafi³

2013

Applied Physics Letters

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Stimulated Raman scattering cascade spanning the wavelength range of 523 to 1750 nm using a graded-index multimode optical fiber We report on the generation of a Raman cascade spanning the wavelength range of 523 to 1750 nm wavelength range, in a standard telecommunication graded-index multimode optical fiber. Despite the highly multimode nature of the pump, the Raman peaks are generated in specific modes of the fiber, confirming substantial beam cleanup during the stimulated Raman scattering process.

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supporting

confidence: 85%

Stimulated Raman scattering cascade spanning the wavelength range of 523 to 1750 nm using a graded-index multimode optical fiber

Pourbeyram¹,

Agrawal²,

Mafi³

2013

Applied Physics Letters

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“…The output spectra from single G-or P-doped bre ( gure 2) exhibit the combined e ects of SRS and FWM. For a Gdoped bre, the rst peak at 539 nm in the output spectrum corresponds to the FWM line, which agrees with other observations in a pure silica bre [11]. The cascade peaks show the FWM-mediated SRS which is o set from the normal SRS by 240 cm 1 .…”

Section: Experimental Set-up and Resultssupporting

confidence: 89%

“…The combination of SRS and FWM in G-doped bre is mutually bene cial. Raman-assisted FWM [13] leads to the earlier occurrence of the FWM and FWM-mediated SRS [11] produces the cascade SRS with a lower threshold.…”

Section: Theoretical Model and Numerical Simulationsmentioning

confidence: 99%

Output characteristics of a fibre Raman laser with a composite GeO 2 and P 2 O 5 -doped silica fibre

Xu¹,

Prabhu²,

Li³

et al. 2001

Journal of Modern Optics

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A new type of bre Raman laser composed of a GeO 2 -and P 2 O 5 -doped silica bre was investigated experimentally and theoretically. The output of the laser displays two di erence characteristics depending on the type of bre being used as the input end. Using the P 2 O 5 -doped bre as the input end, the Raman Stokes line of 1320 cm 1 shift was enhanced by the latter GeO 2 -doped bre. While the GeO 2 -doped bre used as the input end, a wideband continuous spectrum was obtained. A model including e ects of bandwidth of the Raman gain, four-wave mixing and the mutual in uence of the GeO 2 -and P 2 O 5 -doped silica bre was constructed to illustrate the experimental observation. IntroductionStimulated Raman scattering (SRS) in optical bres has been researched intensively for over two decades [1][2][3]. The relevant applications cover many elds from optical communication, bre sensor to nonlinear spectroscopy. In the research of biophotonics and photodynamic diagnostics, tunable coherence sources operating around 600 nm are needed. The photon energy of this wavelength region is high enough to activate the photosensitizer e ciently and not too high to cause serious self-uorescence of tissue. A bre Raman laser pumped by a doublefrequency Nd:YAG laser is a potential candidate for this purpose with the advantages of good beam quality, easy handling and long lifetime. Among the various types of Raman bre used today [4-6], GeO 2 -doped (germanosilicate or G-doped) and P 2 O 5 -doped (phosphosilicate or P-doped) silica bres attract most attention. GeO 2 -doped silica bres have a broad Raman gain spectrum with the peak at 440 cm 1 , the same as that for a pure silica bre. The amplitude of Raman gain in the G-doped bre is proportional to the doping ratio and the Raman gain of pure GeO 2 is nine times that of pure SiO 2 material [7]. The Raman gain spectrum of P 2 O 5 -doped bres has two peaks at 440 and 1320 cm 1 which correspond to the vibrational band of SiO 2 and P 2 O 5 respectively [8]. It can be found that the third Raman order of GeO 2 coincide with the rst Raman order of P 2 O 5 . This coincidence, involving other nonlinear processes, such as four-wave mixing (FWM) [9], self-phase modulation (SPM) and cross-phase modulation (XPM) [10], will lead to a unique output of the composite P-and G-doped bre. In this paper, SRS for the composition of these two bres is investigated for the rst time

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“…Here, the GA provides an optimized collection of modes on the SLM that generates a selective FWM interaction to pull the average wavelength down. Similar spectral-shifts can be achieved by manually adjusting the input coupling of the fiber 38,54 . However, the SLM provides a systematic and controlled feedback methodology that allows precise modal excitation for the desired results.…”

Section: Figure 3: Wavefront Shaping Of Srs Peaks (A) 3rd Srs Peak Omentioning

confidence: 96%

“…The SLM provides continuous control over the spectrum to produce the desired output by controlling the mixture of modes at the input of the MMF. The spectral shifts of the cascade are obtained by mixed-mode excitation 38,54 . Here, the GA provides an optimized collection of modes on the SLM that generates a selective FWM interaction to pull the average wavelength down.…”

Section: (C) 5th Srs Peak Optimization the Green Square Marks The Spe...mentioning

confidence: 99%

Wave-front shaping for nonlinear light propagation in multimode fibers

2017

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Recent remarkable progress in wave-front shaping has enabled control of light propagation inside linear media to focus and image through scattering objects. In particular, light propagation in multimode fibers comprises complex intermodal interactions and rich spatiotemporal dynamics. Control of physical phenomena in multimode fibers and its applications is in its infancy, opening opportunities to take advantage of complex mode interactions. In this work, we demonstrate a wave-front shaping approach for controlling nonlinear phenomena in multimode fibers. Using a spatial light modulator at the fiber's input and a genetic algorithm optimization, we control a highly nonlinear stimulated Raman scattering cascade and its interplay with four wave mixing via a flexible implicit control on the superposition of modes that are coupled into the fiber. We show for the first time versatile spectrum manipulations including shifts, suppression, and enhancement of Stokes and anti-Stokes peaks. These demonstrations illustrate the power of wave-front shaping to control and optimize nonlinear wave propagation.

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Four-photon-mixing-mediated stimulated Raman scattering in a multimode optical fiber

Cited by 17 publications

References 8 publications

Stimulated Raman scattering cascade spanning the wavelength range of 523 to 1750 nm using a graded-index multimode optical fiber

Stimulated Raman scattering cascade spanning the wavelength range of 523 to 1750 nm using a graded-index multimode optical fiber

Output characteristics of a fibre Raman laser with a composite GeO 2 and P 2 O 5 -doped silica fibre

Wave-front shaping for nonlinear light propagation in multimode fibers

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