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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

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Published on: December 15, 2021

Megahertz scan rates enabled by optical sampling by repetition-rate tuning.

D Bajek¹, M A Cataluna²

¹School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK. d.bajek@hw.ac.uk.

Scientific Reports

|November 27, 2021

Summary

We achieved record megahertz scan rates using optical sampling by repetition-rate tuning (OSBERT). This breakthrough enables faster time-resolved spectroscopy by electronically tuning a compact laser diode.

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Area of Science:

Optics and Photonics
Ultrafast Spectroscopy
Laser Physics

Background:

Time-resolved spectroscopy traditionally faces limitations in scan speed.
Existing optical sampling by repetition-rate tuning (OSBERT) methods have slower scan rates.
Compact and tunable pulsed laser sources are crucial for advanced spectroscopic techniques.

Purpose of the Study:

To demonstrate optical sampling by repetition-rate tuning (OSBERT) at unprecedented megahertz scan rates.
To develop a novel system for high-speed electronic modulation of a laser diode's repetition rate.
To enable real-time acquisition of ultrafast optical phenomena.

Main Methods:

Utilized a compact, tunable 2-section passively mode-locked laser diode (MLLD) as the pulsed source.
Implemented an imbalanced Michelson interferometer configuration with a passive delay line (PDL).
Employed impedance-matching and a signal generator for megahertz-frequency sinusoidal electrical biasing of the MLLD's saturable absorber.

Main Results:

Achieved record megahertz optical sampling scan rates, a three-order-of-magnitude improvement over previous OSBERT demonstrations.
Successfully demonstrated real-time acquisition of a cross-correlation trace of two ultrashort optical pulses within 1 microsecond.
Validated the electronic tunability of the MLLD's repetition rate from sub-hertz to megahertz frequencies.

Conclusions:

The developed OSBERT system offers groundbreaking megahertz scan rates for time-resolved spectroscopy.
This advancement paves the way for highly competitive scan rates in various spectroscopic applications.
Potential applications include pump-probe spectroscopy, metrology, and other ultrafast optical measurements.