Broadband Ultrahigh-Resolution chip-scale Scanning Soliton Dual-Comb Spectroscopy

Abstract

We present a chip-scale scanning dual-comb spectroscopy (SDCS) approach for broadband ultrahigh-resolution spectral acquisition. SDCS uses Si3N4 microring resonators that generate two single soliton micro-combs spanning 37 THz (300 nm) on the same chip from a single 1550-nm laser, forming a high-mutual-coherence dual-comb. We realize continuous tuning of the dual-comb system over the entire optical span of 37.5 THz with high precision using integrated microheater-based wavelength trackers. This continuous wavelength tuning is enabled by simultaneous tuning of the laser frequency and the two single soliton micro-combs over a full free spectral range of the microrings. We measure the SDCS resolution to be 319+-4.6 kHz. Using this SDCS system, we perform the molecular absorption spectroscopy of H13C14N over its 2.3 THz (18 nm)-wide overtone band, and show that the massively parallel heterodyning offered by the dual-comb expands the effective spectroscopic tuning speed of the laser by one order of magnitude. Our chip-scale SDCS opens the door to broadband spectrometry and massively parallel sensing with ultrahigh spectral resolution.

References in corpus (16)

• Temporal solitons in optical microresonators
• Frequency comb spectroscopy
• Microresonator Soliton Dual-Comb Spectroscopy
• An Integrated-Photonics Optical-Frequency Synthesizer
• Fully integrated ultra-low power Kerr comb generation
• Breaking the Loss Limitation of On-chip High-confinement Resonators
• On-chip dual comb source for spectroscopy
• Thermally Controlled Comb Generation and Soliton Modelocking in Microresonators
• Adaptive real-time dual-comb spectroscopy
• Octave-spanning dissipative Kerr soliton frequency combs in $S{i}_3{N}_4$ microresonators
• Spectroscopy of the Methane ν3 Band with an Accurate Mid-Infrared Coherent Dual- Comb Spectrometer
• Vernier spectrometer using counter-propagating soliton microcombs
• Spatial multiplexing of soliton microcombs
• Gapless dual-comb spectroscopy in terahertz region
• Continuous scanning of a dissipative Kerr-microresonator soliton comb for broadband, high resolution spectroscopy
• Photonic chip-based resonant supercontinuum

Cited by in corpus (3)

• An integrated lithium-niobate electro-optic platform for spectrally tailored dual-comb spectroscopy
• A mid-infrared dual-comb spectrometer in step-sweep mode for high-resolution molecular spectroscopy
• An on-chip III-V-semiconductor-on-silicon laser frequency comb for gas-phase molecular spectroscopy in real-time