Concave diffraction grating and a manufacturing method thereof

Details Concave diffraction grating and a manufacturing method thereof Concave diffraction grating and a manufacturing method thereof

1974-12-09

1977-03-22

Haroian, Harry N.

Geometrical instruments

Scriber

Graduating

B43L 1324

Patent

active

040128431

ABSTRACT:
A tool for ruling grating grooves is reciprocated on a diffraction grating blank with the tool being restrained within a plane inclined at an arbitrary angle relative to a plane lying in contact with one point on a spherical concave of the diffraction grating blank. Translation for a variable pitch-groove spacing which changes as a function of the groove number or groove position is imparted to the diffraction grating blank in interlocking relationship with the reciprocation, thereby mechanically ruling the desired sphere of the grating blank with the grating grooves, whereby a concave diffraction grating which forms diffracted light of a specific wavelength into a completely stigmatic image at high diffraction efficiency can be manufactured.

REFERENCES:
patent: 2303299 (1942-11-01), Finn
patent: 3344526 (1967-10-01), Hursfield
Concave Diff. Gratings with Variable Spacing, Opt & Spectrusc (USA) vol. 28, No. 4 (Apr. 1970).
Interfer. Control of Grating Ruling etc. J.O.S.A. vol. 45, No. 2, Feb. 1955, pp. 112-121.
Concave High Aperture Diff. Grating etc. Smolkin et al.

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