Abstract
The self-selection of the transverse mode structure due to a radial variation of the population inversion density is investigated in a HeNe laser with no mode discriminators. Radial distributions of gain that are dependent on pumping rate and gas composition are used as a basis for calculations. The effective small-signal single mode gains of Hermite–Gaussian modes (of order up to TEM 15,15) are determined. It is demonstrated that the threshold transverse mode increases in order as increasing pump rate induces a central minimum in the radial gain distribution. Qualitative predictions of the mode structures are made for low and high loss cavities. A 1.6 m long HeNe laser with a supermirror based cavity is described and experimental results from this laser are presented in the context of the theory.
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 callDisclaimer: 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.
