Broadband protective optical window coating

Details Broadband protective optical window coating Broadband protective optical window coating

1997-04-18

1999-11-30

Speer, Timothy

Stock material or miscellaneous articles

Composite

Of inorganic material

428432, 428469, 428704, 359580, 1062862, 1062865, B32B 900, G02B 110

Patent

active

059939818

ABSTRACT:
The present invention provides a broadband transmitting protective coating (10) including an AlGaP protective layer (14) deposited on an optical substrate (12) and an anti-reflection film (16) deposited on the AlGaP protective layer (14). The coating (10) is suitable for use with typical infrared and broadband optical substrate materials such as germanium or multi-spectral ZnS. In the case of a germanium substrate (12), the anti-reflection film (16), (16a) preferably consists of a single layer of hard carbon or alternating layers of hard carbon and silicon. In the case of a multi-spectral ZnS substrate (12a), the anti-reflection film (16b) preferably consists of layered Al.sub.2 O.sub.3 /TaO.sub.5 /LaF.sub.3 /MgF.sub.2. The protective coating (10) is preferably deposited on the optical substrate (12) by a metal organic chemical vapor deposition process wherein an initial layer of AlP is nucleated on the substrate (12) at a temperature of approximately 400.degree. C. The temperature of the substrate (12) is then raised to approximately 600.degree. C. and a layer of AlGaP (14) is grown on the substrate (12) to a preselected thickness. The AlGaP coated optical substrate (12) is then polished to a desired smoothness. The anti-reflection film (16) is then deposited on the AlGaP layer (14) using an RF chemical vapor deposition process or a thermal evaporation process.

REFERENCES:
patent: 3781090 (1973-12-01), Sumita
patent: 4789421 (1988-12-01), Umeno et al.
patent: 5075743 (1991-12-01), Behfar-Rad
patent: 5262196 (1993-11-01), Colton
patent: 5331656 (1994-07-01), Tanaka
patent: 5363390 (1994-11-01), Yang et al.
patent: 5521759 (1996-05-01), Dobrowolski et al.
patent: 5712724 (1998-01-01), Kloeck et al.
patent: 5753379 (1998-05-01), Gibson et al.
patent: 5847876 (1998-12-01), Ferrante et al.
Desmond R. Gibson et al., "Ultradurable phosphide-based antireflection coatings for sand and rain erosion protection" Optical Engineering, vol. 33, No. 3, pp. 957-966, 1994.
S.W. Choi et al., "Remote plasma enhanced chemical vapor deposition of GaP in situ generations phophine precursors", Vacuum Science & Technology B, vol. 10, No. 3, pp. 1070-1073, 1992.
K. L. Lewis et al., "Phosphide based materials as hard optical coatings-- a review", Society of Photo-Optical Engineering, vol. 1275, pp. 46-51, 1990.

Affiliated with

Also associated with

Rating

Broadband protective optical window coating does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Broadband protective optical window coating, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Broadband protective optical window coating will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1669279