Theory and structure of intracavity doubling

diode-pumped graeen laser are discussed.the former is theory. First

the laser threshold and slope efficiency are discussed.when beamof laser diode pumped is smaller in laser crystal

optical density is higher

laser threshold islower and slope efficiency is higher;Second

mechanism with intracavity to enhance IR-Green conversion efficiency is analyzed.In fundamental enhanced mode

the higher mirror re-flected to fundamental wave is

the bigger multiplicity of fundamental wave and the higherconversion efficiency are. Third

″Green Problem″in intracavity doubling Nd:YAG laser isanalyzed.Intracavity doubling Nd:YAG exhibit amplitude fluctuations driven by a combina-tion of sum frequency between orthogonally polarized modes and nonlinear cross saturationproperties beacause of spatial hole burning. The Poincare map is used to diagrammatized chaos behavior in green laser. Some schemes how to overcome″Green Problem″and to obtainstable green light output are designed finally. The latter is laser designed . First

because emission distribution is a ellipsoid cone

a transmission system of LD beam is designed specially. Second

In order to reduce loss in cavity

a plano-convex cavity on which mirror is deposited directly is determined.YAG-KPT and YVO

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-KTP green laser are studied at last.Single transverse mode is easier to gain in YVO

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-KTP green laser than that of YAG-KTPlaser. Specifications:YAG-KTP

threshold :l5.0mW; high output power:14.4mW;slope efficiency:4.1%

wavelength:532nm;YVO

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-KTP

threshold:l00mW

high output power:120mW

slope efficiency:6.3%

wavelength:532nm.