Related Experiment Video
Updated: Jan 24, 2026

Continuous-wave Thulium Laser for Heating Cultured Cells to Investigate Cellular Thermal Effects
Published on: June 30, 2017
Spectral narrowing and stabilization of thulium fiber lasers using guided-mode resonance filters
R Andrew Sims1, Zachary A Roth, Christina C C Willis
1Townes Laser Institute, CREOL College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA. rasims@creol.ucf.edu
Abstract:
We used guided-mode resonance filters (GMRFs), fabricated using thin-film deposition and chemical etching, as intracavity feedback elements to stabilize and narrow the output spectrum in thulium-doped fiber oscillators operating in the 2 μm wavelength regime, producing linewidths of <700 pm up to 10 W power levels. A Tm fiber-based amplified spontaneous emission source was used to characterize the reflective properties of the GMRFs. Linewidths of 500 pm and a 7.3 dB reduction in transmission were measured on resonances.
Related Concept Videos
Resonance
Passive Filters
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
What is a Mode?
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
Active Filters
Distribution of Stresses in a Narrow Rectangular Beam
Nuclear Stability
To hold positively charged protons together...

