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Efficient and tunable blue light generation using lithium niobate nonlinear photonics

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/5.0071769· OSTI ID:1978982

Thin-film lithium niobate (LN) has recently emerged as a playground for chip-scale nonlinear optics and leads to efficient frequency conversions from near-infrared to near-visible bands. For many nonlinear and quantum photonics applications, it is desirable to operate deep into the visible band within LN's transparency window. However, the strong material dispersion at short wavelengths makes phase-matching difficult, necessitating sub-micrometer scale control of domain structures for efficient phase-matching. Here, we report the operation of thin film LN in the blue wavelength and high fidelity poling of the thin-film LN waveguide to this regime. As a result, quasi-phase matching is realized between IR (871 nm) and blue (435.5 nm) wavelengths in a straight waveguide and prompts strong blue light generation with a conversion efficiency (1040% ± 140%/W). This blue second harmonic generator exhibits stable temperature tunability, which is important for applications that require precise frequency alignment, such as atomic clocks.

Research Organization:
Yale University, New Haven, CT (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); Defense Advanced Research Projects Agency (DARPA)
Grant/Contract Number:
SC0019406
OSTI ID:
1978982
Alternate ID(s):
OSTI ID: 1834648
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 23 Vol. 119; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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