Whispering Gallery Mode Resonator Stabilized Narrow Linewidth Fiber Loop Laser
B. Sprenger, H. G. L. Schwefel, and L. J. Wang

TL;DR
This paper presents a narrow linewidth fiber loop laser stabilized by a microsphere, achieving 170 kHz linewidth and demonstrating power and wavelength tuning with pump power, with potential applications discussed.
Contribution
The work introduces a stabilized fiber loop laser using a microsphere as a frequency selective element, achieving narrow linewidth and tunability.
Findings
Lasing linewidth of 170 kHz achieved
Output power increases linearly with pump power
Lasing mode exhibits a red-shift with pump power
Abstract
We demonstrate a narrow line, fiber loop laser using Erbium-doped fiber as the gain material, stabilized by using a microsphere as a transmissive frequency selective element. Stable lasing with a linewidth of 170 kHz is observed, limited by the experimental spectral resolution. A linear increase in output power and a red-shift of the lasing mode were also observed with increasing pump power. Its potential application is also discussed.
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