TY - JOUR
T1 - Multibeam-waist modes in an end-pumped Nd:YVO4 laser
AU - Chen, Ching Hsu
AU - Tai, Po Tse
AU - Hsieh, Wen Feng
AU - Wei, Ming Dar
PY - 2003/6
Y1 - 2003/6
N2 - 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.
AB - 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.
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U2 - 10.1364/JOSAB.20.001220
DO - 10.1364/JOSAB.20.001220
M3 - Article
AN - SCOPUS:0038577978
VL - 20
SP - 1220
EP - 1226
JO - Journal of the Optical Society of America B: Optical Physics
JF - Journal of the Optical Society of America B: Optical Physics
SN - 0740-3224
IS - 6
ER -