Work

Complementary hybrid dual-comb spectroscopy

Year: 2026

Type: article

Abstract: Optical frequency combs generate precise optical frequencies tightly linked to stable microwave references. Dual-comb spectroscopy (DCS) utilizes the coherent interference of two combs with appropriately controlled different repetition frequencies. To improve its performance far beyond the trade-off relationship between its frequency resolution and measurement speed, we present a complementary hybridization approach consisting of a fiber-laser-based comb and an electro-optic-modulator-based comb with a near-integer multiple repetition frequency relationship. We suppressed relative phase noise by locking two distant electro-optic modulator (EOM) comb modes to one of the fiber comb modes and a cavity-locked laser, which was an optical reference of the fiber comb, and achieved a figure of merit of 4.3 × 10 7 Hz 1/2 . Finally, we revisit signal to noise ratio theory to derive a relationship applicable to this configuration and discuss future perspective as regards performance improvement.

Source: Optics Express

DOI: 10.1364/oe.584127

Authors: Ken Kashiwagi, Sho Okubo, Hajime Inaba

Language: English

Topic: Advanced Fiber Laser Technologies

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: Japan Society for the Promotion of Science, Japan Science and Technology Agency

Awards: High speed and high resolution spectroscopy using two types of optical frequency combs, Advanced-control of two types of combs for high-speed and high-resolution spectroscopy, G3470940340, 美濃島知的光シンセサイザプロジェクト