Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2008-01-22
2008-01-22
Amari, Alessandro (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C398S084000
Reexamination Certificate
active
11056507
ABSTRACT:
A diffraction grating having multiple holographic optical elements (HOEs), including a Dickson grating and at least one other volume phase grating (VPG). In typical embodiments, the multi-HOE grating is implemented to provide high dispersion, at least substantially uniform diffraction efficiency and at least substantially equal diffraction efficiencies for all polarizations across a wide range of wavelengths. The refractive index modulations of the Dickson grating's volume phase medium preferably have significantly greater spatial frequency than those of each other VPG of the multi-HOE grating. Typical embodiments of the multi-HOE grating can be manufactured at low cost with sufficiently small size and high dispersion (for both S-polarized and P-polarized radiation) to be useful in Dense Wavelength Division Multiplexing (DWDM) applications and other applications requiring high dispersion. The multi-HOE grating can be implemented as a transmissive or reflective grating.
REFERENCES:
patent: 4993789 (1991-02-01), Biles
patent: 5071210 (1991-12-01), Arnold et al.
patent: 5272550 (1993-12-01), Dickson et al.
patent: 5331445 (1994-07-01), Dickson et al.
patent: 5602657 (1997-02-01), Dickson et al.
patent: 5955721 (1999-09-01), Dickson et al.
patent: 6085980 (2000-07-01), Dickson et al.
patent: 6112990 (2000-09-01), Dickson et al.
patent: 6750995 (2004-06-01), Dickson
patent: 2003/0007201 (2003-01-01), Dickson
patent: 2005/0105909 (2005-05-01), Stone
Chang, M. “Dichromated Gelatin of Improved Quality”, Applied Optics, vol. 10, p. 2250, 1971.
Dickson, L., et al. “Holographic Polarization-Separation Elements,” Applied Optics, vol. 33, No. 23., pp. 5378-5285, Aug. 10, 1994.
Baldry, I.K. “Volume Phase Holographic Gratings: Polarization Properties and Diffraction Efficiency,” Publications of the Astronomical Society of the Pacific, 116, pp. 403-414, May 2004.
Kogelnik, H. “Coupled Wave Theory for Thick Hologram Gratings,” Bell System Technical Journal, vol. 48, No. 9, 1969 (pp. 2909-2947).
Cifelli Dan
Dickson Leroy David
Pearson Elroy
Rallison Richard
Amari Alessandro
Madson & Austin
Wasatch Photonics, Inc.
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