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Intracavity Dual-Resonance Stimulated Raman Spectroscopy with Cavity Ringdown Readout for Resolving Hydrogen Rotational Raman Transitions

Year: 2026

Type: preprint

Abstract: Gas-phase rotational Raman lineshape metrology of hydrogen (H2) is challenging due to its weak Raman scattering cross-sections and intrinsically narrow linewidths. We report the first measurement of the complete Dicke-narrowing evolution of the H2 rotational Raman transitions S0(1) and S0(0), enabled by intracavity dual-resonance stimulated Raman spectroscopy with cavity ringdown readout and kHz-level spectral resolution. Our results establish a benchmark for gas-phase Raman lineshape measurements and provide stringent constraints for regime-based pressure-dependent linewidth models.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2608.28781

Authors: Nie, Qinxue, Lyu, Guanda, Yan, Yue, Ren, Wei

Institution: Chinese University of Hong Kong

Language: English

Topic: Spectroscopy and Laser Applications

Subfield: Spectroscopy

Field: Chemistry

Domain: Physical Sciences

Open Access status: green

Funders: Impact Fund, Innovation and Technology Commission, Chinese University of Hong Kong, Guangdong Science and Technology Department, Innovation and Technology Fund

Awards: G3373245876, G6378129263, Instrument Development For Carbon-14 Detection At Part-Per-Quadrillion Level Based On Doubly Resonant Photoacoustic Spectroscopy, Instrument Development For Carbon-14 Detection At Part-Per-Quadrillion Level Based On Doubly Resonant Photoacoustic Spectroscopy

OpenAlex ID: W7204969531

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