Frequency-modulated stimulated Brillouin spectroscopy in crystals

Sonehara, T.; Konno, Yasutoshi; Kaminaga, H.; Saikan, S.; Ohno, Seigo

doi:10.1364/josab.24.001193

Cited by 15 publications

(13 citation statements)

References 12 publications

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“…In this paper, we describe the experimental results on Brillouin measurements of high-refractive-index glasses. What should make a special mention is the considerably narrow Brillouin linewidth 9.54 MHz of Ge 33 As 12 Se 55 glass, which is comparable to that observed usually in crystalline materials [7]. Fig.…”

Section: Introductionsupporting

confidence: 62%

“…Fortunately, we have recently developed frequencymodulated (FM) stimulated Brillouin spectroscopy employing Nd:YAG lasers with the lasing wavelength of 1.06 lm [6,7]. This spectrometer has the spectral resolution of 20 kHz in the case of 30 cm focal length lense and is capable of detecting separately the imaginary and real parts of Brillouin spectrum.…”

Section: Introductionmentioning

confidence: 99%

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Frequency-modulated stimulated Brillouin spectroscopy in high-refractive-index glasses

Sonehara

Kaminaga

Tatsu

et al. 2008

Journal of Non-Crystalline Solids

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Section: Introductionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Frequency-modulated stimulated Brillouin spectroscopy in high-refractive-index glasses

Sonehara

Kaminaga

Tatsu

et al. 2008

Journal of Non-Crystalline Solids

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“…Figure 5 shows the corresponding RF spectrum measured using an electronic spectrum analyzer (ESA). A beat signal centered at 8.223 GHz with a 20 dB linewidth of 27 kHz was observed, showing that the Brillouin linewidth of the WGMs is well below the natural linewidth in bulk fluoride (about 12 MHz) 27 . In conclusion, we reported in this paper the observation of Brillouin lasing in ultra-high Q BaF 2 WGM resonators.…”

Section: Fsr = C/(πnmentioning

confidence: 93%

“…If we take into account the material refractive index of 1.466 at 1550 nm, we find a Brillouin frequency shift ν B = 8.27 GHz. Another key parameter is the Brillouin gain bandwidth ∆ν B , which is only a few tens of MHz 27 . This narrow gain bandwidth implies a strict phase-matching condition for WGM Brillouin lasers, as it requires a sharp cavity resonance to coincide within the SBS gain regime, as shown in Fig.…”

Section: Optics Department Femto-st Institute [Cnrs Umr6174] 25030 mentioning

confidence: 99%

Cascaded Brillouin lasing in monolithic barium fluoride whispering gallery mode resonators

Lin

Diallo

Saleh

et al. 2014

Applied Physics Letters

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We report the observation of stimulated Brillouin scattering and lasing at 1550 nm in barium fluoride (BaF 2 ) crystal. Brillouin lasing was achieved with ultra-high quality (Q) factor monolithic whispering gallery mode (WGM) mm-size disk resonators. Overmoded resonators were specifically used to provide cavity resonances for both the pump and all Brillouin Stokes waves. Single and multiple Brillouin Stokes radiations with frequency shift ranging from 8.2 GHz up to 49 GHz have been generated through cascaded Brillouin lasing. BaF 2 resonator-based Brillouin lasing can find potential applications for high-coherence lasers and microwave photonics.Stimulated Brillouin scattering (SBS) is a nonlinear optical process resulting from the coherent interaction of light and acoustic waves. It is usually related to the effect of electrostriction and gives rise to inelastic light backscattering with a Doppler downshift related to the acoustic phonon frequency. Over the past years, SBS has been extensively studied in numerous optical waveguides such as optical fibers 1-3 , photonics crystal fibers 4,5 , and on-chip photonic integrated circuits [6][7][8] . A variety of nonlinear materials including silica, chalcogenide or silicon have been investigated. Enhanced SBS has been recently predicted and demonstrated in nanoscale silicon photonic waveguides 9,10 , where the radiation pressure combines with electrostriction to greatly improve the Brillouin gain, thus bridging the gap between SBS and optomechanics. Enhanced and cascaded SBS can also be easily achieved in nonlinear optical cavities, leading to narrow-linewidth and efficient SBS lasing 11,12 . Among optical resonators, whispering gallery mode (WGM) resonators have a number of qualities that make them very attractive for investigating SBS. Their advantages include a strong light confinement due to small mode volumes and ultra-high Q factors 13 . Moreover, crystalline WGM resonators are very interesting because of their broad transparency window ranging from the ultraviolet to the mid-infrared region [14][15][16] . These photonic platforms thus appear as alternative and promising solutions for nonlinear applications, and thus opens an approach to harness and enhance the interaction between photons and acoustic phonons. For instance, Brillouin lasing with microwatt threshold power has recently been observed in ultra-high Q-factor CaF 2 WGM resonators 17 . A narrow-linewidth Brillouin microcavity laser and an ultra-low-phase-noise microwave synthetizer have also been demonstrated using chemically etched ultrahigh-Q silica-on-silicon wedge resonators 18,19 . Brillouin scattering from surface acoustic waves has also been reported in MgF 2 WGM resonators and in silica microspheres [20][21][22] .

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“…It is known that the SBS effect has a typical bandwidth of tens of MHz and a frequency shift of the order of few GHz. For example, calcium fluoride crystal has a measured SBS gain bandwidth of 12 MHz [44] . Therefore, it is very challenging to realize a crystalline Brillouin laser based on a single mode fiber ring structure.…”

Section: Stimulated Brillouin Scattering and Its Thresholdmentioning

confidence: 99%

Opto-acoustic phenomena in whispering gallery mode resonators

Lin

Chembo

2015

International Journal of Optomechatronics

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Optical whispering gallery mode resonators are important platforms to enhance and study various nonlinear frequency conversion processes. Stimulated Brillouin scattering is one of the strongest nonlinear effects, and can be successfully investigated using these platforms. In this article, we study the phenomenon of stimulated Brillouin scattering using a crystalline disk resonator. A fast scanning ringdown spectroscopy technique is used to characterize the optical modes featuring quality factors of the order of one billion at telecom wavelengths. The mW scale threshold power in a centimeter disk resonator is observed and found to be strongly dependent on the gap between the resonator and the prism coupler.

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Frequency-modulated stimulated Brillouin spectroscopy in crystals

Cited by 15 publications

References 12 publications

Frequency-modulated stimulated Brillouin spectroscopy in high-refractive-index glasses

Frequency-modulated stimulated Brillouin spectroscopy in high-refractive-index glasses

Cascaded Brillouin lasing in monolithic barium fluoride whispering gallery mode resonators

Opto-acoustic phenomena in whispering gallery mode resonators

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