Coherent light generators – Particular beam control device – Nonlinear device
Patent
1997-03-19
2000-03-28
Sanghavi, Hemang
Coherent light generators
Particular beam control device
Nonlinear device
H01S 310
Patent
active
060440945
ABSTRACT:
A laser device which is tunable within the mid-IR range is provided. The device includes a thin etalon, formed as an uncoated plane-parallel plate of high refractive index material, which is transparent for both pump and resonant (signal, idler or both) radiation, for coupling the pump beam to the cavity of an optical parametric oscillator. Such an optical element does not require thin film optical coatings and inherently possesses a high optical damage threshold. Furthermore, high reflectivity at the pump wavelength and high transmittance for oscillating radiations are provided, by orienting the etalon at the Brewster angle. Examples of such materials include silicon and germanium, which are transparent at wavelengths longer than approximately 1 .mu.m and 2 .mu.m, respectively, and have refractive indices of n=3.4 and n=4.0, respectively.
REFERENCES:
patent: 5260953 (1993-11-01), Rowe
Inrad
Sanghavi Hemang
Wise Robert E.
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