| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-power and high-efficiency one-dimensional illumination apparatus which is effective for speckle effect reduction, and provide an imaging apparatus. SOLUTION: A one-dimensional transverse multimode laser is used for a one-dimensional illumination apparatus 1. A pumping light source 2, laser medium 4 in a resonator 3, and a wavelength transducer 5 (nonlinear optical crystal or a nonlinear optical device) are disposed. The nonlinear optical crystal or the nonlinear optical device is irradiated with a line beam obtained by exciting the laser medium 4 in an elliptic transverse mode pattern. Then, a one-dimensional light modulation device 7 is irradiated with the wavelength-converted line beam, and scanning with the beam modulated by the device is conducted to produce a two-dimensional image. For example, in a green illumination optical system, in the case where the nonlinear optical device for obtaining visible rays through second harmonic generation from near-infrared light oscillated by a solid-state laser medium has a periodical poling inversion structure, stoichiometric composition periodical poling inversion lithium tantalate having been subjected to vapor transport equilibration is used, whereby reliability is enhanced and a reduction in cost can be achieved through mass production. COPYRIGHT: (C)2006,JPO&NCIPI
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