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Related Experiment Video

Updated: Dec 25, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Intensity noise optimization of a mid-infrared frequency comb difference-frequency generation source.

Vinicius Silva de Oliveira, Axel Ruehl, Piotr Masłowski

|April 3, 2020

Summary

Optimizing temporal overlap in mid-infrared frequency comb sources minimizes relative intensity noise (RIN). Active stabilization of pump-signal pulse delay enhances signal-to-noise ratio for absorption spectra.

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Area of Science:

Nonlinear Optics
Spectroscopy
Frequency Comb Technology

Background:

Mid-infrared (MIR) frequency combs are crucial for high-resolution spectroscopy.
Relative intensity noise (RIN) in the idler pulse impacts spectral measurement sensitivity.
Precise control over pump and signal pulse interactions is vital for noise reduction.

Purpose of the Study:

To experimentally investigate the impact of temporal overlap between pump and signal pulses on the idler pulse's RIN.
To demonstrate active stabilization of the MIR frequency comb to minimize RIN and improve spectral quality.

Main Methods:

Utilizing a difference-frequency generation (DFG) based MIR frequency comb source.
Scanning the temporal delay between 130 fs pump and signal pulses to measure RIN.
Implementing an online RIN detector and feedback control for active stabilization of pulse delay.

Main Results:

A minimum RIN was observed with a 20 fs delay width.
A 20 dB increase in RIN was measured at the edges of the optimal delay.
Active stabilization successfully reduced RIN and enhanced the signal-to-noise ratio (SNR) of MIR absorption spectra.

Conclusions:

Temporal overlap of pump and signal pulses significantly affects MIR frequency comb RIN.
Active stabilization of pulse delay is an effective method for noise reduction.
Improved SNR through active stabilization enables more sensitive MIR spectroscopic measurements.