Dichroic optical filter

Details Dichroic optical filter Dichroic optical filter

1993-09-09

1994-08-23

Ben, Loha

Optical: systems and elements

Having significant infrared or ultraviolet property

Multilayer filter or multilayer reflector

359580, 359584, 359589, G02B 520, G02B 110

Patent

active

053412389

ABSTRACT:
A dichroic optical filter including a substrate that is substantially transparent to visible radiation, and an oxide semiconductor layer on the substrate for reflecting an infrared wavelength (such as an infrared treatment beam wavelength). An example of a suitable oxide semiconductor for reflecting a treatment beam from a CO.sub.2 layer is indium tin oxide. Preferably, the filter includes a specially designed multilayer coating on the oxide semiconductor layer to enhance the reflection of infrared and longer wavelength radiation. This multilayer coating includes alternating quarter-wave layers of high and low refractive index materials, each having an optical thickness substantially equal to a quarter-wavelength of infrared radiation to be reflected. Preferably also, the multilayer coating includes a thin multilayer coating between each pair of adjacent quarter-wave layers, with these thin multilayer coatings being designed to enhance the filter's transmission of visible radiation, while not significantly affecting the filter's reflection of infrared wavelengths. Also preferably, the multilayer coating includes a second multilayer coating which reflects a narrow band of visible radiation (such as visible radiation from a HeNe laser aiming beam), while transmitting most visible wavelengths.

REFERENCES:
patent: 4127789 (1978-11-01), Kostun et al.
patent: 4229066 (1980-10-01), Rancourt et al.
patent: 4273098 (1981-06-01), Silverstein
patent: 4455479 (1984-06-01), Itoh et al.
patent: 4504109 (1985-03-01), Taga et al.
patent: 4507547 (1985-03-01), Taga et al.
patent: 4536063 (1985-08-01), Southwell
patent: 4561436 (1985-12-01), Junnerlyn
patent: 4583815 (1986-04-01), Taga et al.
patent: 4887592 (1989-12-01), Loertscher
patent: 5073451 (1991-12-01), Iida et al.
Japanese Abstract No. JP-A-57 058 109, vol. 6, No. 133 (P-129) Jul. 20, 1982 (Toshiba Electric Equip.) Apr. 7, 1982.

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