Title :
Generation of Hermite-Gaussian modes in fiber-coupled laser-diode end-pumped lasers
Author :
Chen, Y.F. ; Huang, T.M. ; Kao, C.F. ; Wang, C.L. ; Wang, S.C.
Author_Institution :
Precision Instrum. Dev. Center, Nat. Sci. Council, Hsinchu, Taiwan
fDate :
6/1/1997 12:00:00 AM
Abstract :
A general model has been developed for the generation of Hermite-Gaussian modes in fiber-coupled laser-diode end-pumped lasers by off-axis pumping. Hermite-Gaussian modes can be used as an M2 standard in the calibration process due to the fact that these modes have a definite M2 factor. The present model predicts how the oscillation of Hermite-Gaussian modes is affected by the pump position, the pump size, and cavity mode size. A straightforward procedure have also been provided to design the optical coupling system for the lowest threshold in the generation of Hermite-Gaussian modes. All of the key parameters of the optimum pump condition are in terms of laser-diode beam quality and properties of the active medium. Experimental results have shown a fairly good agreement with the theoretical predictions
Keywords :
calibration; laser cavity resonators; laser modes; laser theory; optical fibre couplers; optical pumping; semiconductor lasers; Hermite-Gaussian mode generation; Hermite-Gaussian mode oscillation; M2 standard; active medium; calibration process; cavity mode size; definite M2 factor; fiber-coupled laser-diode end-pumped lasers; general model; laser diodes; laser-diode beam quality; lowest threshold; off-axis pumping; optical coupling system; optimum pump condition; pump position; pump size; Calibration; Fiber lasers; Laser beams; Laser excitation; Laser modes; Laser theory; Optical coupling; Optical design; Predictive models; Pump lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of
