| US 7,577,179 B2 | ||
| Laser irradiation apparatus | ||
| Takeshi Nishida, Osaka (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Sep. 11, 2007, as Appl. No. 11/853,227. | ||
| Claims priority of application No. 2006-246511 (JP), filed on Sep. 12, 2006. | ||
| Prior Publication US 2008/0101431 A1, May 01, 2008 | ||
| Int. Cl. H01S 3/08 (2006.01) | ||
| U.S. Cl. 372—101 [372/69; 372/70; 372/72; 372/75; 372/92] | 20 Claims |
| 2. A laser radiation apparatus comprising:
a solid state laser rod;
an excitation light source surrounding an emission axis of laser light of the solid state laser rod on a cross sectional plane
perpendicular with respect to the emission axis; and
a lens barrel that is positioned such that the lens barrel encloses the excitation light source and condenses light from the
excitation light source to the solid state laser rod, every cross sectional plane of the lens barrel including the emission
axis has a shape of two overlapping ellipses and the two ellipses each have two foci and share one of the two foci with each
other;
the emission axis of the solid state laser rod and the shared focus meet; and
the excitation light source is positioned inside the lens barrel along a path of the other focus.
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