US4591270A — Dispersive optical device

Claim 1

Independent Claim 151 words

A dispersive optical device for use as an element for wave length separation in a monochromator, a spectroscope or the like, comprising a substrate assembly including an exterior surface having an inlet surface portion, an outlet surface portion and at least one reflecting surface portion, said substrate assembly also including first and second substrates positioned against one another, said first and second substrates having a first and a second reflection grating, respectively, said first and second reflection gratings facing said inlet and outlet surface portions, respectively, the first reflection grating arranged back to back to the second reflection grating, said first and second reflection gratings arranged so that their grating rules are parallel to each other, said reflecting surface portion directing light diffracted by the first reflection grating toward the second reflection grating, and a light-absorbent coating applied to said exterior surface except at said inlet, outlet and reflecting surface portions.

Claim 2

Dependent Claim 151 words

A dispersive optical device for use as an element for wave length separation in a monochromator, a spectroscope or the like, comprising a substrate assembly including an exterior surface having an inlet surface portion, an outlet surface portion and at least one reflecting surface portion, said substrate assembly also including first and second substrates positioned against one another, said first and second substrates having a first and a second reflection grating, respectively, said first and second reflection gratings facing said inlet and outlet surface portions, respectively, the first reflection grating arranged back to back to the second reflection grating, said first and second reflection gratings arranged so that their grating rules are parallel to each other, said reflecting surface portion directing light diffracted by the first reflection grating toward the second reflection grating, and a light-absorbent coating applied to said exterior surface except at said inlet, outlet and reflecting surface portions.

Claim 3

Dependent Claim 59 words

The device as claimed in claim 1, wherein the first reflection grating and the second reflection grating have a diffraction angle and an angle of incidence, respectively, in the range of 70°-88°, and said light-absorbent coating has a refractive index which is approximately equal to that of the substrate of said substrate assembly to which said coating is applied.

Claim 4

Dependent Claim 162 words

A dispersive optical device for use as a basic element for wave length separation in a monochromator, a spectroscope or the like, comprising a first and second reflection or transmission grating so arranged on a common substrate that their planes and their grating rules are parallel to each other, the mutual arrangement of the two gratings being such that the light diffracted by the first grating passes through said substrate before striking the second grating and diffracted thereby, said first grating having a diffraction angle of at least 60° and the second grating having an angle of incidence of at least 60°, wherein the angle between a normal to the first grating and a light path between the centers of the gratings is in the range of 70°-88°, and a light absorbent coating, the refractive index of which is close to that substrate, is applied to the optical device, except at the surface portion of the substrate facing away from the gratings.

Claim 5

Dependent Claim 162 words

A dispersive optical device for use as a basic element for wave length separation in a monochromator, a spectroscope or the like, comprising a first and second reflection or transmission grating so arranged on a common substrate that their planes and their grating rules are parallel to each other, the mutual arrangement of the two gratings being such that the light diffracted by the first grating passes through said substrate before striking the second grating and diffracted thereby, said first grating having a diffraction angle of at least 60° and the second grating having an angle of incidence of at least 60°, wherein the angle between a normal to the first grating and a light path between the centers of the gratings is in the range of 70°-88°, and a light absorbent coating, the refractive index of which is close to that substrate, is applied to the optical device, except at the surface portion of the substrate facing away from the gratings.

Claim 6

Dependent Claim 37 words

The device as claimed in claim 3 wherein the substrate is transparent, the gratings are applied on either side of the transparent substrate with planar parallel surfaces, and the gratings are arranged mutually displaced in their planes.

Claim 7

Dependent Claim 34 words

A device as claimed in claim 4, wherein the first grating has a diffraction angle in the range of 70°-88° and said second grating has an angle of incidence in the range of 70°-88°.

Claim 8

Dependent Claim 34 words

The device as claimed in claim 4, further including means for setting the angle of the device in order that light departing from the device parallel to the incident light is of predetermined wavelength.

Claim 9

Dependent Claim 35 words

The device as claimed in claim 3, further including means for setting the angle of the device in order that light departing from the device parallel to the incident light is of a predetermined wavelength.

Claim 10

Dependent Claim 35 words

The device as claimed in claim 7, further including a mirror pivotable out of and into the path of the departing light and an eye-piece arranged to receive the departing light reflected by the mirror.

Claim 11

Dependent Claim 36 words

The device as claimed in claim 3 or 7 further including a wavelength scale provided at the input of the first grating or at the output of the second grating to be readable at the output.

Claim 12

Dependent Claim 33 words

The device as claimed in claim 3 further including two devices coupled in series and that the input of the first device is arranged in line with the output of the second device.

Claim 13

Dependent Claim 21 words

The device as claimed in claim 3, 5 or 2, wherein said first and second gratings have the same grating frequency.

Claim 14

Dependent Claim 102 words

A dispersive optical device for use as an element for wave length separation in a monochromator a spectroscope or the like, comprising a first and a second reflection or transmission grating so arranged on a common substrate that their planes and their grating rules are parallel to each other, the mutual arrangement of the two gratings being such that the light diffracted by the first grating passes through said substrate before striking the second grating, and means for setting the angle of the device in order that light departing from the device parallel to the incident light is of a predetermined wavelength.

Claim 15

Dependent Claim 102 words

A dispersive optical device for use as an element for wave length separation in a monochromator a spectroscope or the like, comprising a first and a second reflection or transmission grating so arranged on a common substrate that their planes and their grating rules are parallel to each other, the mutual arrangement of the two gratings being such that the light diffracted by the first grating passes through said substrate before striking the second grating, and means for setting the angle of the device in order that light departing from the device parallel to the incident light is of a predetermined wavelength.

Claim 16

Dependent Claim 132 words

A dispersive optical device for use as a basic element for wave length separation in a monochromator, a spectroscope or the like, comprising a first and a second reflection or transmission grating so arranged on a common substrate that their planes and their grating rules are parallel to each other, the mutual arrangement of the two gratings being such that the light diffracted by the first grating passes through said substrate before striking the second grating and diffracted thereby, said first grating having a diffraction angle of at least 60° and the second grating having an angle of incidence of at least 60°, said device further including a wavelength scale provided at the input of the first grating or at the output of the second grating to be readable at the output.

Claim 17

Dependent Claim 132 words

A dispersive optical device for use as a basic element for wave length separation in a monochromator, a spectroscope or the like, comprising a first and a second reflection or transmission grating so arranged on a common substrate that their planes and their grating rules are parallel to each other, the mutual arrangement of the two gratings being such that the light diffracted by the first grating passes through said substrate before striking the second grating and diffracted thereby, said first grating having a diffraction angle of at least 60° and the second grating having an angle of incidence of at least 60°, said device further including a wavelength scale provided at the input of the first grating or at the output of the second grating to be readable at the output.

Claim 18

Dependent Claim 129 words

A dispersive optical device for use as a basic element for wave length separation in a monochromator, a spectroscope or the like, comprising a first and a second reflection or transmission grating so arranged on a common substrate that their planes and their grating rules are parallel to each other, the mutual arrangement of the two gratings being such that the light diffracted by the first grating passes through said substrate before striking the second grating and diffracted thereby, said first grating having a diffraction angle of at least 60° and the second grating having an angle of incidence of at least 60°, further including two devices in a series and that the input of the first device is arranged in line with the output of the second device.

Claim 19

Dependent Claim 129 words

A dispersive optical device for use as a basic element for wave length separation in a monochromator, a spectroscope or the like, comprising a first and a second reflection or transmission grating so arranged on a common substrate that their planes and their grating rules are parallel to each other, the mutual arrangement of the two gratings being such that the light diffracted by the first grating passes through said substrate before striking the second grating and diffracted thereby, said first grating having a diffraction angle of at least 60° and the second grating having an angle of incidence of at least 60°, further including two devices in a series and that the input of the first device is arranged in line with the output of the second device.

Claim 20

Dependent Claim 19 words

The device as claimed in claim 14 or 10, further including means for setting the angle between both devices.

Claim 21

Dependent Claim 30 words

The device as claimed in claim 15, further including a focusing element of large focal length between the output of the first device and the input of the second device.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-05-26	1989-11-25	1990-05-27	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-05-26	1993-11-25	1994-05-27	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-05-26	1997-11-25	1998-05-27	$7700.00	Window Closed / Lapsed

Dispersive optical device

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