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Proceedings Paper

Coupling of lithium niobate disk resonators to integrated waveguides
Author(s): S. Berneschi; F. Cosi; G. Nunzi Conti; S. Pelli; S. Soria; G. C. Righini; M. Dispenza; A. Secchi
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Paper Abstract

Whispering gallery mode (WGM) disk resonators fabricated in single crystals can have high Q factors within their transparency bandwidth and may have application both in fundamental and applied optics. Lithium niobate (LN) resonators thanks to their electro-optical properties may be used in particular as tunable filters, modulators, and delay lines. A critical step toward the actual application of these devices is the implementation of a robust and efficient coupling system. High index prisms are typically used for this purpose. In this work we demonstrate coupling to high-Q WGM LN disks from an integrated optical LN waveguide. The waveguides are made by proton exchange in X-cut LN. The disks with diameters of about 5 mm and thickness of 1 mm are made from commercial Z-cut LN wafers by core drilling a cylinder and thereafter polishing the edges into a spheroidal profile. Both resonance linewidth and cavity photon lifetime measurements were performed to calculate the Q factor of the resonator, which is in excess of 108.

Paper Details

Date Published: 8 February 2011
PDF: 6 pages
Proc. SPIE 7941, Integrated Optics: Devices, Materials, and Technologies XV, 79410U (8 February 2011); doi: 10.1117/12.876378
Show Author Affiliations
S. Berneschi, Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi (Italy)
Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
F. Cosi, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
G. Nunzi Conti, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
S. Pelli, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
S. Soria, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
G. C. Righini, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
M. Dispenza, SELEX Sistemi Integrati S.p.A. (Italy)
A. Secchi, SELEX Sistemi Integrati S.p.A. (Italy)


Published in SPIE Proceedings Vol. 7941:
Integrated Optics: Devices, Materials, and Technologies XV
Jean Emmanuel Broquin; Gualtiero Nunzi Conti, Editor(s)

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