Abstract
We present a study of the higher-order subthreshold transverse modes in a single-frequency laser resonator. A theory is developed to describe the gain behavior when an input beam is reinjected into the laser, and tuned around the resonances that correspond to each of the subthreshold transverse modes of the cavity. Some of the predictions of the theory are confirmed by experiments with an argon-ion laser and these experiments also illustrate the use of spatial filtering for optimization of the gain, as well as an associated increase in intensity-fluctuation noise. Further experiments have been carried out to demonstrate the perturbation of the modes caused by the insertion of intracavity obstructions; the data are compared with the results from theoretical modeling of the perturbed resonator. In addition, the experimental techniques are used to track the behavior of a transverse mode as it approaches, and finally exceeds, the lasing threshold.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physical review. A, Atomic, molecular, and optical physics
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
