Grism
AssigneeRiken
InventorsNoboru Ebizuka, Kashiko Kodate, Keiko Oka, Masanori Ie, Toshikazu Ebisuzaki
Life of this patent
Estimating the term…
Abstract
In order to achieve highly dispersive spectrometry in wide wavelength with the use of a single grism, but not a plurality of grisms, the grism is composed of a prism the vertex angle of which can be varied and a volume phase holographic (VPH) grating. More specifically, the grism comprises a prism the vertex angle of which can be varied; and a VPH grating being a diffraction grating and disposed substantially orthogonal with respect to a side including the vertex angle of the prism; the VPH grating being rotated around an axis being substantially orthogonal to the side of the prism, whereby a slope angle defined by the VPH grating and a predetermined plane is varied.
Claims11
A grism comprising:
- a prism the vertex angle of which can be varied;
- and
- a VPH grating being a diffraction grating and disposed substantially parallel with respect to a side adjacent the vertex angle of said prism;
- said VPH grating being rotated around an axis being substantially orthogonal to the side of said prism, whereby a slope angle defined by said VPH grating and a predetermined plane is varied.
A grism comprising:
- a prism the vertex angle of which can be varied;
- a VPH grating being a diffraction grating and disposed substantially parallel with respect to a side adjacent the vertex angle of said prism;
- and
- holding substrates for holding said VPH grating;
- said VPH grating being rotated around an axis being substantially orthogonal to the side of said prism, whereby a slope angle defined by said VPH grating and a predetermined plane is varied.
A grism comprising:
- a first prism the vertex angle of which can be varied;
- a second prism the vertex angle of which can be varied;
- and
- a VPH grating being a diffraction grating;
- said grism being formed by sandwiching said VPH grating in between said first prism and said second prism so as to oppose the vertex angle of said first prism to the vertex angle of said second prism;
- light being input from the outside through a surface of said first prism, the light input inside said first prism being input to said VPH grating after transmitting through said first prism, the light passed through said VPH grating being input into said second prism, and the light transmitted through said second prism being output to the outside from the surface of said second prism.
Dependencies are inferred from the claim text.