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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

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Quasi-real-time dual-comb spectroscopy with 750-MHz Yb:fiber combs.

Haochen Tian, Runmin Li, Lukasz A Sterczewski

|October 27, 2022

Summary

This study introduces quasi-real-time dual-comb spectroscopy (DCS) for precise measurements. The technique significantly improves spectral resolution and data acquisition speed for optical spectroscopy applications.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Area of Science:

Spectroscopy
Optical Physics
Metrology

Background:

Dual-comb spectroscopy (DCS) offers high spectral resolution but is often limited by timing and phase fluctuations.
Real-time correction methods are crucial for enhancing the performance and applicability of DCS.

Purpose of the Study:

To develop and demonstrate a quasi-real-time dual-comb spectroscopy technique for improved spectral accuracy and speed.
To address timing and phase instabilities in DCS measurements.

Main Methods:

Utilized two Yb:fiber combs with ~750 MHz repetition rates.
Employed a computational coherent averaging technique for interferogram phase correction.
Implemented quasi-real-time phase correction (1 ms acquisitions every 1.5 s) with RF phase-locking.

Main Results:

Reduced RF comb linewidth from 200 kHz to ~1 kHz within 1 ms.
Increased line-to-floor ratio by 13 dB in power over 1 ms.
Achieved ~180 GHz optical coverage around 1.035 µm on a sub-microsecond timescale.

Conclusions:

The presented quasi-real-time DCS technique effectively corrects phase and timing fluctuations.
Demonstrated significant improvements in spectral resolution and acquisition speed.
Validated the technique by observing the absorption profile of gaseous acetylene.