Towards Visible Frequency Comb Generation Using a Hollow WGM Resonator

Kasumie, Sho; Yang, Yong; Ward, Jonathan; Chormaic, Síle Nic

doi:10.2184/lsj.46.2_92

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…Developing applications in many areas such as biological imaging, underwater communications and detection, atomic clocks, and quantum technologies all rely on wavelengths in this range [20]. To date, near-visible optically pumped parametric oscillation and Kerr frequency combs have been realized in silica WGRs [21][22][23][24][25][26]. Green and blue light generation through a third-harmonic process with near-IR pumping near 1550 nm also has been observed [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Blue band nonlinear optics and photodarkening in silica microdevices

Tian¹,

Yu²,

Lei³

et al. 2022

Photon. Res.

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There are extensive studies to date on optical nonlinearities in microcavities at the near and mid-IR wavelengths. Pushing this research into the visible region is equally valuable. Here, we demonstrate a directly pumped, blue band Kerr frequency comb and stimulated Raman scattering (SRS) at 462 nm in a silica nanofiber-coupled whispering gallery microcavity system. Notably, due to the high optical intensities achieved, photodarkening is unavoidable and can quickly degrade the optical quality of both the coupling optical nanofiber and the microcavity, even at very low pump powers. Nonetheless, stable hyperparametric oscillation and SRS are demonstrated in the presence of photodarkening by taking advantage of in-situ thermal bleaching. This work highlights the challenges of silica-based, short wavelength nonlinear optics in high-quality, small mode volume devices and gives an effective method to overcome this apparent limitation, thus providing a baseline for optics research in the blue region for any optical devices fabricated from silica.

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Section: Introductionmentioning

confidence: 99%

Blue band nonlinear optics and photodarkening in silica microdevices

Tian¹,

Yu²,

Lei³

et al. 2022

Photon. Res.

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show abstract

“…In the past few decades, the level of research activity on whispering gallery mode (WGM) resonators, has increased rapidly [1][2][3][4][5][6][7]. Concurrently, the number of WGM geometries has also increased.…”

Section: Introductionmentioning

confidence: 99%

A tellurite glass optical microbubble resonator

Yu,

Zhang,

Wang

et al. 2020

Preprint

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We present a method for making microbubble whispering gallery resonators (WGRs) from tellurite, which is a soft glass, using a CO 2 laser. The customized fabrication process permits us to process glasses with low melting points into microbubbles with loaded quality factors as high as 2.3 × 10 6 . The advantage of soft glasses is that they provide a wide range of refractive index, thermo-optical and optomechanical properties. The temperature and air pressure dependent optical characteristics of both passive and active tellurite microbubbles are investigated. For passive tellurite microbubbles, the measured temperature and air pressure sensitivities are 4.9 GHz/K and 7.1 GHz/bar, respectively. The large thermal tuning rate is due to the large thermal expansion coefficient of 1.9 × 10 −5 K −1 of the tellurite microbubble. In the active Yb 3+ -Er 3+ co-doped tellurite microbubbles, C-band single-mode lasing with a threshold of 1.66 mW is observed with a 980 nm pump and a maximum wavelength tuning range of 1.53 nm is obtained. The sensitivity of the laser output frequency to pressure changes is 6.5 GHz/bar. The microbubbles fabricated by this novel method have a low eccentricity and uniform wall thickness, as determined from electron microscope images and the optical spectra. The compound glass microbubbles described herein have potential for a wide range of applications, including sensing, as tunable microcavity lasers, and for integrated photonics.

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A tellurite glass optical microbubble resonator

Zhang

Wang

et al. 2020

Opt. Express

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We present a method for making microbubble whispering gallery resonators (WGRs) from tellurite, which is a soft glass, using a CO2 laser. The customized fabrication process permits us to process glasses with low melting points into microbubbles with loaded quality factors as high as 2.3 × 106. The advantage of soft glasses is that they provide a wide range of refractive index, thermo-optical, and optomechanical properties. The temperature and air pressure dependent optical characteristics of both passive and active tellurite microbubbles are investigated. For passive tellurite microbubbles, the measured temperature and air pressure sensitivities are 4.9 GHz/K and 7.1 GHz/bar, respectively. The large thermal tuning rate is due to the large thermal expansion coefficient of 1.9 × 10−5 K−1 of the tellurite microbubble. In the active Yb3+-Er3+ co-doped tellurite microbubbles, C-band single-mode lasing with a threshold of 1.66 mW is observed with a 980 nm pump and a maximum wavelength tuning range of 1.53 nm is obtained. The sensitivity of the laser output frequency to pressure changes is 6.5 GHz/bar. The microbubbles fabricated using this method have a low eccentricity and uniform wall thickness, as determined from electron microscope images and the optical spectra. The compound glass microbubbles described herein have the potential for a wide range of applications, including sensing, nonlinear optics, tunable microcavity lasers, and integrated photonics.

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Towards Visible Frequency Comb Generation Using a Hollow WGM Resonator

Cited by 4 publications

References 18 publications

Blue band nonlinear optics and photodarkening in silica microdevices

Blue band nonlinear optics and photodarkening in silica microdevices

A tellurite glass optical microbubble resonator

A tellurite glass optical microbubble resonator

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