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Red narrow-linewidth lasing and frequency comb from gain-switched self-injection-locked Fabry-Pérot laser diode
Artem E Shitikov1, Ramzil R Galiev2, Kirill N Min'kov3
1Russian Quantum Center, Skolkovo, Moscow, 143025, Russia. Artem.E.Shitikov@gmail.com.
Scientific Reports
|June 17, 2023
Summary
Researchers achieved ultranarrow linewidth lasers at 638 nm using self-injection locking. This breakthrough offers superior performance for visible-range lasers, crucial for advanced spectroscopy applications.
Area of Science:
- Optics and Photonics
- Laser Physics
- Materials Science
Background:
- Narrow-linewidth lasers are essential for advanced applications, particularly in the visible spectrum.
- Self-injection locking to high-quality factor (Q) whispering gallery modes is a key technique for enhancing laser performance.
Purpose of the Study:
- To demonstrate ultranarrow linewidth lasing at 638 nm using a stabilized Fabry-Pérot laser diode.
- To investigate the potential for visible frequency comb generation in a gain-switched regime.
Main Methods:
- Utilized a crystalline magnesium fluoride (MgF2) microresonator for self-injection locking of a Fabry-Pérot laser diode.
- Employed a frequency-separation line technique to measure laser linewidth and stability.
- Operated the laser in a gain-switched regime to generate frequency combs.
Main Results:
- Achieved instantaneous linewidths below 10 Hz (20 µs averaging time) and 1.4 kHz (10 ms stability) at 638 nm.
- Obtained output power exceeding 80 mW.
- Demonstrated tunable visible frequency comb generation with linespacing from 10 MHz to 3.8 GHz.
- Observed sub-Hz linewidth for beatnotes between comb lines, indicating spectral purification.
Conclusions:
- The demonstrated self-injection locking technique provides a pathway to high-performance visible lasers with ultranarrow linewidths and significant output power.
- The generation of visible frequency combs with tunable spacing and high spectral purity opens new possibilities for high-resolution spectroscopy.
