# US 8,786,855 B2 · Shaped input apertures to improve resolution in grating spectrometers

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- Number: US 8,786,855 B2
- Document ID: US8786855B2
- Status: Granted
- Kind: B2
- Application number: 13/357,804
- Filed: 2012-01-25
- Published: 2012-07-26
- Granted: 2014-07-22
- Earliest claimed: 2011-01-25
- Assignees: Ocean Optics, Inc.
- Applicants: David R. Demmer; Thomas L. Haslett; Jason M. Eichenholz
- Inventors: David R. Demmer; Thomas L. Haslett; Jason M. Eichenholz
- Web page: https://patentgrep.com/patent/US8786855B2

## CPC

- G01J 3/04: Slit arrangements {slit adjustment}
- G01J 3/0205: {Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows}
- G01J 3/0208: {using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction}
- G01J 3/0286: {Constructional arrangements for compensating for fluctuations caused by temperature, humidity or pressure, or using cooling or temperature stabilization of parts of the device; Controlling the atmosphere inside a spectrometer, e.g. vacuum}
- G01J 3/0291: {Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path arrangements}
- G01J 3/0229: {using masks, aperture plates, spatial light modulators or spatial filters, e.g. reflective filters}
- G01J 3/0256: {Compact construction}
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)

## Abstract

An aperture shaped to provide a narrow beam in the horizontal plane but a wider beam in the vertical plane that will provide improved image quality in spectrometers without sacrificing as much throughput as typically experienced using a reduced diameter round aperture along with a method of mounting the entrance slit and the limiting aperture on a transparent block for optical stability and ease of alignment is disclosed.

## Claims

### Claim 1

A device for improving image quality in a grating spectrometer or monochromator having a fixed slit width comprising a light entrance slit and an aperture on opposite sides of a transparent input block.

### Claim 2

A device for improving image quality in a grating spectrometer or monochromator having a folded optical configuration comprising a light entrance slit and a limiting aperture having a larger aperture number in the dispersion plane than in a plane perpendicular to the dispersion plane further comprising said light entrance slit and said limiting aperture on opposite sides of a transparent input block.