Micro and Nano Raman Lasers

Sirleto, L.

doi:10.3390/mi12010015

Cited by 2 publications

(4 citation statements)

References 35 publications

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“…The generation of coherent light with the help of the well-known phenomenon of inelastic stimulated Raman scattering in photonic microresonators has been attracting great interest in recent years. Raman microresonator lasers find various applications as sensors and biosensors [ 1 , 2 ] and provide a promising platform for studying fundamental physical phenomena [ 3 , 4 , 5 ]. While traditional lasers with population inversion can operate at certain wavelengths belonging to the gain band, Raman lasers can potentially operate in the entire transparency window of the used material (with suitable pump lasers).…”

Section: Introductionmentioning

confidence: 99%

Raman Lasing in a Tellurite Microsphere with Thermo-Optical on/off Switching by an Auxiliary Laser Diode

Anashkina,

Marisova,

Dorofeev

et al. 2023

Micromachines

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The generation of coherent light based on inelastic stimulated Raman scattering in photonic microresonators has been attracting great interest in recent years. Tellurite glasses are promising materials for such microdevices since they have large Raman gain and large Raman frequency shift. We experimentally obtained Raman lasing at a wavelength of 1.8 µm with a frequency shift of 27.5 THz from a 1.54 µm narrow-line pump in a 60 µm tellurite glass microsphere with a Q-factor of 2.5 × 107. We demonstrated experimentally a robust, simple, and cheap way of thermo-optically controlled on/off switching of Raman lasing in a tellurite glass microsphere by an auxiliary laser diode. With a permanently operating narrow-line pump laser, on/off switching of the auxiliary 405 nm laser diode led to off/on switching of Raman generation. We also performed theoretical studies supporting the experimental results. The temperature distribution and thermal frequency shifts in eigenmodes in the microspheres heated by the thermalized power of an auxiliary diode and the partially thermalized power of a pump laser were numerically simulated. We analyzed the optical characteristics of Raman generation in microspheres of different diameters. The numerical results were in good agreement with the experimental ones.

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Section: Introductionmentioning

confidence: 99%

Raman Lasing in a Tellurite Microsphere with Thermo-Optical on/off Switching by an Auxiliary Laser Diode

Anashkina,

Marisova,

Dorofeev

et al. 2023

Micromachines

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“…Raman lasers are based on different materials, including bulk elements made of crystals and glasses [5,6], glass fibers [3,7], gas-filled fibers [8,9], microresonators made of glass and crystalline materials [10,11], gases in cells [12], and others. An active medium and a resonator are frequently required for creating lasers, including Raman ones [1] (although random distributed feedback (DFB) lasers with a mirrorless open cavity are also known [13]).…”

Section: Introductionmentioning

confidence: 99%

“…For example, for fiber lasers, several pairs of Bragg gratings corresponding to the number of Raman cascades can be used [15]. However, a microresonator with whispering gallery modes (WGMs) is simultaneously a gain medium and a cavity for a Raman microlaser including multicascade ones [10,11,16]. A dielectric resonator with WGMs can trap photons by total internal reflection ensuring light propagation along its equator [10].…”

Section: Introductionmentioning

confidence: 99%

“…A dielectric resonator with WGMs can trap photons by total internal reflection ensuring light propagation along its equator [10]. Such microresonators have huge Q-factors and large nonlinearity due to extremely small mode volume, which make it possible to attain nonlinear effects at very low pump powers [10,11,16]. It is known that Raman generation is observed in WGM microresonators in many cascades (for example, the number of cascades was five in silica [16] and chalcogenide As 2 S 3 [17] microspheres, and eight in a CaF 2 microdisk [18]).…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Study of Multicascade Raman Microlasers Based on TeO2–WO3–Bi2O3 Glass

Anashkina,

Marisova,

Andrianov

2023

Photonics

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The development and investigation of miniature narrow-line coherent light sources based on microresonators with low-power-consumption whispering gallery modes (WGMs) is an actual trend in modern photonics. Raman WGM microlasers can operate at wavelengths inaccessible to traditional laser media and provide a huge pump frequency tuning range. Here, we propose and theoretically study multicascade Raman microlasers based on soft tellurite TeO2–WO3–Bi2O3 glass WGM microresonators (microspheres) which can operate in the near-IR and mid-IR with the pump in the telecommunication range. Thanks to a large Raman gain (120 times exceeding the maximum Raman gain of silica glass) and a huge Raman frequency shift of 27.5 THz for this glass, the Raman waves at 1.83 µm, 2.21 µm, 2.77 µm, and 3.7 µm in the first, second, third, and fourth cascades, respectively, are theoretically demonstrated with a pump at 1.57 µm. We analyze in detail the influence of different factors on the characteristics of the generated Raman waves, such as microsphere diameters, Q-factors, pump powers, and detuning of the pump frequency from exact resonance. We also solve a thermo-optical problem to show that the temperature of a soft glass microresonator heated due to partial thermalization of pump power remains below the glass transition temperature. To the best of our knowledge, mid-IR tellurite glass Raman WGM microlasers have not been studied before.

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Micro and Nano Raman Lasers

Cited by 2 publications

References 35 publications

Raman Lasing in a Tellurite Microsphere with Thermo-Optical on/off Switching by an Auxiliary Laser Diode

Raman Lasing in a Tellurite Microsphere with Thermo-Optical on/off Switching by an Auxiliary Laser Diode

Theoretical Study of Multicascade Raman Microlasers Based on TeO2–WO3–Bi2O3 Glass

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