Radiation hardness of high-Q silicon nitride microresonators for space compatible integrated optics

Brasch, Victor; Chen, Qun-Feng; Schiller, S.; Kippenberg, Tobias J.

doi:10.1364/oe.22.030786

Cited by 51 publications

(35 citation statements)

References 31 publications

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“…In addition Si 3 N 4 microresonators were the first microresonator platform that allowed for the observation of soliton induced Cherenkov radiation [51] (or dispersive wave emission), i.e. the dynamics of solitons in the presence of higher order dispersion [52]. Fabrication of the resonators proceeds by lithography, etching and a final encapsulation technique in which the waveguides are clad with fused silica.…”

Section: Integrated Photonic Chip Microring Resonatorsmentioning

confidence: 99%

Dissipative Kerr Solitons in Optical Microresonators

Herr¹,

Gorodetsky²,

Kippenberg³

2015

Nonlinear Optical Cavity Dynamics

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This chapter describes the discovery and stable generation of temporal dissipative Kerr solitons in continuous-wave (CW) laser driven optical microresonators. The experimental signatures as well as the temporal and spectral characteristics of this class of bright solitons are discussed. Moreover, analytical and numerical descriptions are presented that do not only reproduce qualitative features but can also be used to accurately model and predict the characteristics of experimental systems. Particular emphasis lies on temporal dissipative Kerr solitons with regard to optical frequency comb generation where they are of particular importance. Here, one example is spectral broadening and selfreferencing enabled by the ultra-short pulsed nature of the solitons. Another example is dissipative Kerr soliton formation in integrated on-chip microresonators where the emission of a dispersive wave allows for the direct generation of unprecedentedly broadband and coherent soliton spectra with smooth spectral envelope.

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Section: Integrated Photonic Chip Microring Resonatorsmentioning

confidence: 99%

Dissipative Kerr Solitons in Optical Microresonators

Herr¹,

Gorodetsky²,

Kippenberg³

2015

Nonlinear Optical Cavity Dynamics

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“…Experimental characterization is therefore essential to understand the limitations of a specific system. Silicon nitride (Si 3 N 4 ) is a space compatible [16], CMOS-compatible material [17] with a large Kerr nonlinear coefficient, an absence of two photon absorption in the telecommunication window, ultralow losses [18,19], and a wide transparency window from visible to midinfrared. These properties have in particular been ex-ploited for chip-scale frequency combs [4,20], as well as coherent low-pulse-energy supercontinuum generation in the near- [21] and mid-infrared [22].…”

Section: Introductionmentioning

confidence: 99%

Thermo-refractive noise in silicon nitride microresonators

Huang¹,

Erwan²,

Raja³

et al. 2019

Conference on Lasers and Electro-Optics

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Thermodynamic noise places a fundamental limit on the frequency stability of dielectric optical resonators. Here, we present the characterization of thermo-refractive noise in photonic-chip-based silicon nitride (Si3N4) microresonators and show that thermo-refractive noise is the dominant thermal noise source in the platform. We employed balanced homodyne detection to measure the thermo-refractive noise spectrum of microresonators of different diameters. The measurements are in good agreement with theoretical models and finite element method (FEM) simulations. Our characterization sets quantitative bounds on the scaling and absolute magnitude of thermal noise in photonic chip-based microresonators. An improved understanding of thermo-refractive noise can prove valuable in the design considerations and performance limitations of future photonic integrated devices.

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“…Our experimental platform are silicon nitride (Si 3 N 4 further called SiN) optical microresonators, which are highly suitable for integrated nonlinear photonics due to its large band gap and the resulting wide transparency window [18] and which are compatible with space applications [50]. Pioneering work[17] demonstrated optical frequency comb generation in a SiN microresonator, providing a path to planar, CMOS compatible frequency comb sources.…”

mentioning

confidence: 99%

Photonic chip–based optical frequency comb using soliton Cherenkov radiation

Brasch

Geiselmann

Herr

et al. 2016

Science

764

628

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Optical frequency combs [1,2] provide a series of equidistant laser lines and have revolutionized the field of frequency metrology within the last decade. Originally developed to achieve absolute optical frequency measurements, optical frequency combs have enabled advances in other areas [3] such as molecular fingerprinting [4,5], astronomy [6], range finding [7] or the synthesis of low noise microwave signals [8]. Discovered in 2007[9, 10], microresonator (Kerr) frequency combs have emerged as an alternative and widely investigated method to synthesize optical frequency combs offering compact form factor, chipscale integration, multi-gigahertz repetition rates, broad spectral bandwidth and high power per frequency comb line. Since their discovery there has been substantial progress in fundamental understanding [11][12][13], theoretical modeling [14][15][16], on-chip planar integration [17,18] and resulting applications [19][20][21]. Yet, in no demonstration could two key properties of optical frequency combs, broad spectral bandwidth and coherence, be achieved simultaneously. Here we overcome this challenge by accessing, for the first time, soliton induced Cherenkov radiation [22,23] in an optical microresonator. By continuous wave pumping of a dispersion engineered, planar silicon nitride microresonator [17,18], continuously circulating, sub-30 fs short temporal dissipative Kerr solitons [24][25][26] are generated, that correspond to pulses of 6 optical cycles and constitute a coherent optical frequency comb in the spectral domain. Emission of soliton induced Cherenkov radiation caused by higher order dispersion broadens the spectral bandwidth to 2/3 of an octave, sufficient for self referencing [1,2], in excellent agreement with recent theoretical predictions [16] and the broadest coherent microresonator frequency comb generated to date. Once generated it is shown that the soliton induced Cherenkov radiation based frequency comb can be fully phase stabilized. The overall relative accuracy of the generated comb with respect to a reference fiber laser frequency comb is measured to be 3 · 10 −15 . The ability to preserve coherence over a broad spectral bandwidth using soliton induced Cherenkov radiation marks a critical milestone in the development of planar optical frequency combs, enabling on one hand application in e.g. coherent communications [19], broadband dual comb spectroscopy [27] and Raman spectral imaging [28], while on the other hand significantly relaxing dispersion requirements for broadband microresonator frequency combs [29] and providing a path for their generation in the visible and UV. Our results underscore the utility and effectiveness of planar microresonator frequency comb technology, that offers the potential to make frequency metrology accessible beyond specialized laboratories.Optical solitons are propagating pulses of light that retain their shape due to a balance of nonlinearity and dispersion [24][25][26]30]. In the presence of higher order dispersion optical solitons can emit solito...

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Radiation hardness of high-Q silicon nitride microresonators for space compatible integrated optics

Cited by 51 publications

References 31 publications

Dissipative Kerr Solitons in Optical Microresonators

Dissipative Kerr Solitons in Optical Microresonators

Thermo-refractive noise in silicon nitride microresonators

Photonic chip–based optical frequency comb using soliton Cherenkov radiation

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