Coherent light generators – Particular active media
Reexamination Certificate
2010-04-01
2010-10-12
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular active media
C372S040000
Reexamination Certificate
active
07813394
ABSTRACT:
High-power, diode-pumped solid state (DPSS) pulsed lasers are preferred for applications such as micromachining, via drilling of integrated circuits, and ultraviolet (UV) conversion. Nd:YVO4(vanadate) lasers are good candidates for high power applications because they feature a high energy absorption coefficient over a wide bandwidth of pumping wavelengths. However, vanadate has poor thermo-mechanical properties, in that the material is stiff and fractures easily when thermally stressed. By optimizing laser parameters and selecting pumping wavelengths and doping a concentration of the gain medium to control the absorption coefficient less than 2 cm−1such as the pumping wavelength between about 910 nm and about 920 nm, a doped vanadate laser may be enhanced to produce as much as 100 W of output power without fracturing the crystal material, while delivering a 40% reduction in thermal lensing.
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Peng Xiaoyuan
Ren Wensheng
Electro Scientific Industries Inc.
Harvey Minsun
Nguyen Tuan N.
Stoel Rives LLP
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