Rubidium-Referenced Frequency-Doubled Pockels Laser with High-Speed Electro-Optic Tuning
Abstract
Narrow-linewidth lasers with rapid frequency control are essential for atomic physics and quantum technologies, yet combining these capabilities in chip-integrated sources at visible wavelengths remains challenging. Here we demonstrate a hybrid integrated InP/thin-film lithium niobate Pockels laser that emits at 780 nm through intracavity second-harmonic generation and supports gigahertz-bandwidth frequency tuning. A periodically poled lithium niobate waveguide is embedded in a laser cavity terminated by an extended distributed Bragg reflector, which provides electro-optically tunable feedback only at the 1560 nm fundamental wavelength. This design yields a singly resonant cavity that enhances frequency conversion while allowing the second-harmonic output to follow rapid tuning without resonance alignment. The laser achieves intrinsic linewidths of 2.7 kHz at 1560 nm and 9.0 kHz at 780 nm, with electro-optic tuning bandwidths beyond 1 GHz at both wavelengths. A mode-hop-free tuning range of 6.48 GHz at 780 nm enables direct spectroscopy of the rubidium D2 transition. Locking the second-harmonic output to this transition reduces the standard deviation of its frequency fluctuations from 135 MHz to 8 MHz and transfers the atomic frequency reference to the fundamental. These results establish integrated frequency-doubled Pockels lasers as compact, rapidly tunable sources that could simplify the optical architectures for future atomic and quantum photonic systems.
Related
- Generation of Blue Electro-Optic Frequency Combs via a Four-Wave-Mixing Process in Rubidium Atomic Vapor.
- Rubidium referenced Kerr comb with cavity phase matching
- Frequency comb-referenced spectroscopic measurements in the second overtone of HD
- A Portable Dual-Color Two-Photon Rubidium Optical Frequency Standard
- Rayleigh Backscattering Reflectometry using Incoherent Frequency-Modulated Continuous Wave and Bidirectional Electro-Optic Modulation
BibTeX
@misc{chen2026rubidiumreferenced,
title = {{Rubidium-Referenced Frequency-Doubled Pockels Laser with High-Speed Electro-Optic Tuning}},
author = {Xu Chen and Michael Li and Xiaodong Shi and Lin Zhou and Ran Yang and Mengyao Zhao and Veerendra Dhyani and Sakthi Sanjeev Mohanraj and Guangxing Wu and Hao Hao and Xia Yu and Di Zhu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.37279},
eprint = {2610.37279},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.37279},
}
RIS
TY - UNPB
TI - Rubidium-Referenced Frequency-Doubled Pockels Laser with High-Speed Electro-Optic Tuning
AU - Xu Chen
AU - Michael Li
AU - Xiaodong Shi
AU - Lin Zhou
AU - Ran Yang
AU - Mengyao Zhao
AU - Veerendra Dhyani
AU - Sakthi Sanjeev Mohanraj
AU - Guangxing Wu
AU - Hao Hao
AU - Xia Yu
AU - Di Zhu
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2610.37279
UR - https://arxiv.org/abs/2610.37279
AB - Narrow-linewidth lasers with rapid frequency control are essential for atomic physics and quantum technologies, yet combining these capabilities in chip-integrated sources at visible wavelengths remains challenging. Here we demonstrate a hybrid integrated InP/thin-film lithium niobate Pockels laser that emits at 780 nm through intracavity second-harmonic generation and supports gigahertz-bandwidth frequency tuning. A periodically poled lithium niobate waveguide is embedded in a laser cavity terminated by an extended distributed Bragg reflector, which provides electro-optically tunable feedback only at the 1560 nm fundamental wavelength. This design yields a singly resonant cavity that enhances frequency conversion while allowing the second-harmonic output to follow rapid tuning without resonance alignment. The laser achieves intrinsic linewidths of 2.7 kHz at 1560 nm and 9.0 kHz at 780 nm, with electro-optic tuning bandwidths beyond 1 GHz at both wavelengths. A mode-hop-free tuning range of 6.48 GHz at 780 nm enables direct spectroscopy of the rubidium D2 transition. Locking the second-harmonic output to this transition reduces the standard deviation of its frequency fluctuations from 135 MHz to 8 MHz and transfers the atomic frequency reference to the fundamental. These results establish integrated frequency-doubled Pockels lasers as compact, rapidly tunable sources that could simplify the optical architectures for future atomic and quantum photonic systems.
ER -