Raman Laser Switching Induced by Cascaded Light Scattering

Kasumie, Sho; Lei, Fuchuan; Ward, Jonathan; Jiang, Xuefeng; Yang, Lan; Chormaic, Síle Nic

doi:10.1002/lpor.201900138

Cited by 17 publications

(13 citation statements)

References 49 publications

(86 reference statements)

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“…2(b), up to five orders of cascaded SRS can be seen. The spacing between the center of the 1st order SRS band and the pump light is ∼10 nm (∼13.8 THz) and the result is consistent with the Raman shift of bulk silica glass [40]. Despite our observations, the optical nonlinear processes were highly unstable.…”

Section: Blue-band Comb Generation and Stimulated Raman Scatteringsupporting

confidence: 84%

Blue-band frequency comb and photodarkening in silica whispering gallery microresonators

Tian¹,

Yu²,

Lei³

et al. 2021

Preprint

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In contrast to the generation of optical frequency combs in the near and mid-infrared wavelengths, pushing optical frequency combs into the visible and ultraviolet is equally valuable, for example for direct applications in miniature optical clocks and spectroscopy. Currently, the blue-band is the shortest wavelength region for the generation of Kerr frequency combs, which have been realized using a magnesium fluoride resonator. However, direct comb generation from silica resonators would significantly simplify both the fabrication and integration processes. Here, we demonstrate for the first time, a blue-band Kerr frequency comb directly generated in a silica whispering gallery resonator (WGR) with a silica tapered fiber for optical coupling. A Kerr frequency comb with 13 comb lines is observed using a laser centered around 462 nm with a launched pump power of 30 mW. Significantly, the transmission through the coupling tapered fiber and the optical quality of the whispering gallery modes (WGMs) degrade quickly when pumped with the blue light. This leads to annihilation of the frequency comb, photodarkening being the expected cause. These observations appear to be a significant limiting factor for nonlinear optical processes in silica WGRs and provide a baseline for future nonlinear optics research in WGRs in the blue region.

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Section: Blue-band Comb Generation and Stimulated Raman Scatteringsupporting

confidence: 84%

Blue-band frequency comb and photodarkening in silica whispering gallery microresonators

Tian¹,

Yu²,

Lei³

et al. 2021

Preprint

Self Cite

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“…One can conclude that when the intensity of the first Raman signal becomes sufficient, this signal can act as a pump to produce the next Stokes by SRS. Without previous Raman signal, it is impossible to obtain a higher Raman signal in a cascaded SRS process 38 . As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Narrow-band random Raman lasing from Rhodamine 6G assisted by cascaded stimulated Raman scattering effect

Hosseini

Yazdani

Sajad

2021

Sci Rep

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This study reports the first experimental observation of cascaded stimulated Raman scattering (SRS) generation in a colloidal disordered medium. Generation of the cascaded effect requires both a high Raman gain and pump power in the disordered medium. Here, to extend effective path lengths of photons into the Raman gain medium for producing additional SRS processes, ZnO microspheres with abundant nano-protrusions as suitable scattering centers are proposed. It is explained that nano-protrusions on the surface of the spheres can act as nano reflectors and significantly provide potent feedback in the disordered system. This provided feedback via nano-protrusions boosts cascaded SRS generation to allow the appearance of higher Raman signals of Rhodamine 6G dye solution at a low scatterer concentration of 5 mg/ml. The threshold for the formation of the first Raman signal is measured at about 60 mJ/pulse. Also, the evolution of Raman signals under several fixed pump pulses is examined to investigate the stability from pulse to pulse. Our findings provide promising perspectives for achieving the single-frequency laser sources and generate desirable wavelengths for specific applications.

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“…2 C ) with the threshold of 213

, where the cascaded Raman laser is absent ( 39 , 48 ). Note that multiline Raman lasers were also reported previously with the presence of Kerr parametric gain ( 49 , 50 ) or cascaded scattering gain ( 51 ), which are avoided in the present work by carefully controlling the pump power as well as the coupling condition. The clamping of the pump field is then examined by monitoring the intracavity pump power via an add–drop coupling scheme ( 22 , 52 ).…”

mentioning

confidence: 85%

Single-mode characteristic of a supermode microcavity Raman laser

Zhang

Cao

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Microlasers in near-degenerate supermodes lay the cornerstone for studies of non-Hermitian physics, novel light sources, and advanced sensors. Recent experiments of the stimulated scattering in supermode microcavities reported beating phenomena, interpreted as dual-mode lasing, which, however, contradicts their single-mode nature due to the clamped pump field. Here, we investigate the supermode Raman laser in a whispering-gallery microcavity and demonstrate experimentally its single-mode lasing behavior with a side-mode suppression ratio (SMSR) up to 37 dB, despite the emergence of near-degenerate supermodes by the backscattering between counterpropagating waves. Moreover, the beating signal is recognized as the transient interference during the switching process between the two supermode lasers. Self-injection is exploited to manipulate the lasing supermodes, where the SMSR is further improved by 15 dB and the laser linewidth is below 100 Hz.

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Raman Laser Switching Induced by Cascaded Light Scattering

Cited by 17 publications

References 49 publications

Blue-band frequency comb and photodarkening in silica whispering gallery microresonators

Blue-band frequency comb and photodarkening in silica whispering gallery microresonators

Narrow-band random Raman lasing from Rhodamine 6G assisted by cascaded stimulated Raman scattering effect

Single-mode characteristic of a supermode microcavity Raman laser

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