Second harmonic generation with focused broadband and high-order transverse mode lasers
- 1 January 1988
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Quantum Electronics
- Vol. 24 (1) , 113-117
- https://doi.org/10.1109/3.102
Abstract
A theoretical study on the optimum conditions of second-harmonic generation with focused high-order transverse-mode and broadband longitudinal-mode lasers is presented. It is shown that the ratio of the second-harmonic intensities for TEM/sub 00/, TEM/sub 10/, and TEM/sub 11/, modes are 1:3/4:9/64, indicating that the deviation from phase matching beyond the focus for high-order-mode lasers is catastrophic. Phase coherence of each longitudinal mode of a broadband laser yields a higher parametric generation than a randomly distributed laser. Line-width narrowing and the acceptance-angle widening of the output wave become pronounced as the bandwidth and the fundamental mode number increase.<>Keywords
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