Multibeam-waist modes in an end-pumped Nd:YVO4 laser

Ching Hsu Chen, Po Tse Tai, Wen Feng Hsieh, Ming Dar Wei

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We studied both numerically and experimentally the transverse modes near degenerate resonator configurations such as g1g2 = 1/4, 1/2, 3/4 in a simple plano-concave Nd:YVO4 laser with a small pump size. We found that there are stationary modes that show an additional beam waist besides the well-known waist on the fiat mirror end near g1g2 = 1/4, 3/4. When the specific modes of the three degeneracies propagate through a lens, they are capable of exhibiting multiple beam waists. The multibeam-waist mode possesses a small waist size without a ring structure in the near field on the flat mirror end; nevertheless, it has a far-field pattern with many concentric rings. The numerical results show good agreement with the experimental observations. Furthermore, by simultaneously considering the wavelike and the raylike character of the multibeam-waist mode, we found that it can be represented as a superposition of N consecutive round-trip electric fields of period-N solution in the degenerate empty cavity, where N = 2 for g1g2 = 1/2 and N = 3 for g1g2 = 1/4, 3/4.

Original languageEnglish
Pages (from-to)1220-1226
Number of pages7
JournalJournal of the Optical Society of America B: Optical Physics
Volume20
Issue number6
DOIs
Publication statusPublished - 2003 Jun

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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