Athermal high-Q tantalum-pentoxide-based microresonators on silicon substrates

Wang, Tzyy-Jiann; Chen, Po-Kuang; Li, Yanting; Sung, An-Ni

doi:10.1016/j.optlastec.2021.106925

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…The factor of the TiO -cladded LiNbO microresonator is reduced by 11% as compared with the uncladded one. Other material combinations like GeSbSe and Ta O were tested [136,137], showing low , but significant losses (…”

Section: Additional Thermal Stabilizationmentioning

confidence: 99%

Recent advances in laser self-injection locking to high-Q microresonators

et al. 2023

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The stabilization and manipulation of laser frequency by means of an external cavity are nearly ubiquitously used in fundamental research and laser applications. While most of the laser light transmits through the cavity, in the presence of some back-scattered light from the cavity to the laser, the self-injection locking effect can take place, which locks the laser emission frequency to the cavity mode of similar frequency. The self-injection locking leads to dramatic reduction of laser linewidth and noise. Using this approach, a common semiconductor laser locked to an ultrahigh-Q microresonator can obtain sub-Hertz linewidth, on par with state-of-the-art fiber lasers. Therefore it paves the way to manufacture high-performance semiconductor lasers with reduced footprint and cost. Moreover, with high laser power, the optical nonlinearity of the microresonator drastically changes the laser dynamics, offering routes for simultaneous pulse and frequency comb generation in the same microresonator. Particularly, integrated photonics technology, enabling components fabricated via semiconductor CMOS process, has brought increasing and extending interest to laser manufacturing using this method. In this article, we present a comprehensive tutorial on analytical and numerical methods of laser self-injection locking, as well a review of most recent theoretical and experimental achievements.

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Section: Additional Thermal Stabilizationmentioning

confidence: 99%

Recent advances in laser self-injection locking to high-Q microresonators

et al. 2023

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“…To mitigate undesired thermal effect, researchers often explore a combination of different materials with opposite temperature coefficients (TOC), a configuration commonly referred to as an athermal hybrid microresonator [30]- [36]. Nevertheless, achieving the athermal effect often comes at the cost of compromising the Q factor, which drops below 10 6 due to either material absorption or the immaturity of fabrication techniques for diverse materials, such as the TiO 2 [37], Ta 2 O 5 [35] and organic materials (PDMS [21] or PMMA [23]). Additionally, the interplay of opposing thermooptic effects can result in thermal oscillations within the hybrid microresonator.…”

Section: Introductionmentioning

confidence: 99%

Compensation of the Thermal Effect in a Mounted Microbubble Resonator

Wang,

Ren,

Qiao

et al. 2024

IEEE Photonics J.

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To mitigate the temperature dependence of the resonance frequency in microcavities, athermal photonic devices have been developed by incorporating materials with an opposite thermo-optical coefficient (TOC). Here, we conduct an experimental demonstration of the athermal effect in a microbubble resonator, employing an aluminum (Al) holder for its mounting. By converting the thermal expansion of the holder into controlled geometry adjustments in the microbubble resonator, we achieve athermal optical modes at a specific temperature. The athermal compensation is accomplished by counterbalancing the pulling force resulting from the thermal expansion of the Al holder against the thermal characteristics of the material, specifically SiO2. Especially, the optical modes located around the equator are particularly susceptible to the influence of the pulling force exerted by the Al holder. This temperature-insensitive feature of the resonance establishes a new avenue towards athermal microresonator through this special structure.

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