A chip-scale second-harmonic source via self-injection-locked all-optical poling

Marco Clementi; Edgars Nitiss; Junqiu Liu; Elena Durán-Valdeiglesias; Sofiane Belahsene; Hélène Debrégeas; Tobias J. Kippenberg; Camille-Sophie Brès

doi:10.1038/s41377-023-01329-6

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A chip-scale second-harmonic source via self-injection-locked all-optical poling

Original Articles

- A chip-scale second-harmonic source via self-injection-locked all-optical poling
- Light: Science & Applications Vol. 12, Issue 12, Pages: 2778-2787(2023)
- Affiliations：
  
  1.Photonic Systems Laboratory (PHOSL), École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
  2.Laboratory of Photonics and Quantum Measurements (LPQM), École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
  3.Almae Technologies, Route de Nozay, 91460 Marcoussis, France
- Author bio：
  
  Marco Clementi (marco.clementi@epfl.ch)
  Camille-Sophie Brès (camille.bres@epfl.ch)
- Funds：
- DOI：10.1038/s41377-023-01329-6
  CLC：
- Published：31 December 2023，
  
  Published Online：08 December 2023，
  
  Received：24 July 2023，
  
  Revised：10 October 2023，
  
  Accepted：06 November 2023
- Accepted：
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Clementi, M. et al. A chip-scale second-harmonic source via self-injection-locked all-optical poling. Light: Science & Applications, 12, 2778-2787 (2023).
DOI：

Clementi, M. et al. A chip-scale second-harmonic source via self-injection-locked all-optical poling. Light: Science & Applications, 12, 2778-2787 (2023). DOI： 10.1038/s41377-023-01329-6.

摘要

Abstract

Second-harmonic generation allows for coherently bridging distant regions of the optical spectrum

with applications ranging from laser technology to self-referencing of frequency combs. However

accessing the nonlinear response of a medium typically requires high-power bulk sources

specific nonlinear crystals

and complex optical setups

hindering the path toward large-scale integration. Here we address all of these issues by engineering a chip-scale second-harmonic (SH) source based on the frequency doubling of a semiconductor laser self-injection-locked to a silicon nitride microresonator. The injection-locking mechanism

combined with a high-Q microresonator

results in an ultra-narrow intrinsic linewidth at the fundamental harmonic frequency as small as 41 Hz. Owing to the extreme resonant field enhancement

quasi-phase-matched second-order nonlinearity is photoinduced through the coherent photogalvanic effect and the high coherence is mapped on the generated SH field. We show how such optical poling technique can be engineered to provide efficient SH generation across the whole C and L telecom bands

in a reconfigurable fashion

overcoming the need for poling electrodes. Our device operates with milliwatt-level pumping and outputs SH power exceeding 2 mW

for an efficiency as high as 280%/W under electrical driving. Our findings suggest that standalone

highly-coherent

and efficient SH sources can be integrated in current silicon nitride photonics

unlocking the potential of

(2)

processes in the next generation of integrated photonic devices.

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Keywords

references

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