Related Experiment Video
Updated: May 17, 2026
14:18
Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
Polarization-dependent intensity noise in a microchip solid-state laser with spatially coherent polarization vector
1Department of Human and Information Science, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa 259-1207, Japan. ootsuka@keyaki.cc.u‑tokai.ac.jp
Optics Letters
|October 18, 2012
Summary
Noise reduction was achieved in a solid-state laser by controlling pump-beam focus. This enhanced the stronger Ince-Gauss (IG) mode component, leading to a more coherent output.
Area of Science:
- Laser physics
- Quantum optics
- Solid-state lasers
Background:
- Investigating noise in laser systems is crucial for applications requiring high signal fidelity.
- Isotropic microchip solid-state lasers offer unique properties for mode control.
- Polarization-resolved intensity noise characterization is key to understanding laser dynamics.
Purpose of the Study:
- To experimentally investigate polarization-resolved intensity noise in a specific laser system.
- To explore the formation of spatially coherent polarization vector fields via mode superposition.
- To determine the effect of pump-beam focus on noise reduction in laser modes.
Main Methods:
- Utilizing a laser-diode-pumped isotropic microchip solid-state laser.
- Employing transverse mode locking to create a coherent superposition of orthogonally polarized Ince-Gauss (IG) modes.
- Performing polarization-resolved intensity noise measurements while controlling pump-beam focus.
Main Results:
- Observed spatially coherent polarization vector fields formed by the superposition of two IG modes.
- Demonstrated significant noise reduction in the stronger IG mode component.
- Showcased the influence of pump-beam focus on noise characteristics and mode dominance.
Conclusions:
- Controlling pump-beam focus effectively reduces intensity noise in specific laser modes.
- The coherent superposition of IG modes enables the generation of spatially coherent polarization vector fields.
- This research provides insights into noise suppression techniques for solid-state lasers.
Related Concept Videos
01:29Potential Due to a Polarized Object
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
01:15Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...