Laser with gain medium suppressing higher order modes to...

Coherent light generators – Particular active media

Reexamination Certificate

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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; Xu, Lei; and Asundi, Anand, “Power Scaling of Diode-Pumped Nd:YVO4Lasers,”IEEE Journal of Quantum Electronics, vol. 38, No. 9, Sep. 2002, pp. 1291-1299.
Schlatter, A.; Krainer, L.; Golling, M.; Paschotta, R., “Passively Mode-Locked 914-nm Nd:YVO4Laser,”Optics Letters, vol. 30, No. 1; Jan. 1, 2005; pp. 44-46.
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