China Flat-Field Concave Holographic Grating Manufacturer
An aberration-corrected concave grating specifically optimized for monochromator systems with fixed incident and exit angles. Based on the classic Seya-Namioka optical path configuration, it achieves excellent focusing performance through variable-pitch gratings.
Core Principle: Rowland Circle
The angle between the incident and exit beams is fixed (typically 2K≈60°-70°), allowing scanning of the entire wavelength simply by rotating the grating.
• Fixed Angle: Typical value 61.6°
• Wavelength Scanning: Only grating rotation required, no slit movement needed
• Aberration Correction Design: Optimized holographic recording parameters correct astigmatism and coma.
Key Advantages
• Simple Mechanical Structure: Fixed incident/exit slits, only grating rotation required
• Excellent Vacuum Compatibility: Particularly suitable for vacuum UV monochromators
• Wide Band Coverage: A single grating can cover 50nm-800nm
Typical Applications
Vacuum UV monochromator, UV-Vis spectrophotometer, synchrotron radiation beamline, plasma diagnostics
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|
| number |
Gradient density (l/mm) |
Wavelength range (nm) |
Blazing Wavelength (nm) |
Base radius (mm) |
Ra(mm) |
Rb(mm) |
2K |
Scaled area (H×W mm²) |
Efficiency curve |
|
JY6-001 |
1200 |
200-800 |
210 |
112 |
100 |
94 |
61.6° |
25×25 |
|
|
JY6-002 |
1200 |
250-800 |
250 |
112 |
100 |
94 |
61.6° |
25×25 |
|
|
JY6-003 |
1200 |
250-800 |
290 |
112 |
100 |
94 |
61.6° |
25×25 |
|
|
JY6-004 |
1200 |
200-800 |
200 |
224 |
200 |
188 |
61.6° |
25×25 |
|
| Other specifications will be added gradually. | |||||||||
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![Seya-Namioka Flat-Field Concave Holographic Grating 1200l/mm 210nm]()
Seya-Namioka Flat-Field Concave Holographic Grating 1200l...This is a Seya-Namioka flat-field concave holographic grating optimized for UV-VIS monochromator grating applications where size matters. As a concave grating manufacturer, we engineered this variant -
![Seya-Namioka Flat-Field Concave Holographic Grating 1200l/mm 200nm-800nm]()
Seya-Namioka Flat-Field Concave Holographic Grating 1200l...This is a Seya-Namioka flat-field concave holographic grating—a concave grating for monochromator applications where wavelength scanning is essential and simplicity matters.As a concave grating
High-Performance Concave Holographic Grating for Seya-Namioka Spectrometers and Monochromators
The Seya-Namioka flat-field concave holographic grating is a precision diffraction grating engineered for advanced spectroscopic systems requiring curved grating geometry and flat-field spectral imaging.
Its optical architecture is specifically optimized for Seya-Namioka monochromators and spectrometers, where a single optic simultaneously performs dispersion and focusing functions within a compact optical layout. Through advanced holographic recording, the groove pattern is custom-tailored to control aberrations and deliver exceptional imaging performance across the focal plane.
For OEM and system-integration projects, gratings must be specified based on complete optical prescriptions rather than selected by groove density alone. Contact our engineering team with your wavelength range, groove density, optical geometry, substrate, coating, and mechanical requirements to request a technical quotation.
Product Overview
|
Parameter |
Specification |
|
Product Type |
Concave holographic diffraction grating |
|
Optical Configuration |
Seya-Namioka |
|
Field Format |
Flat-field |
|
Primary Function |
Diffraction and spectral focusing |
|
Wavelength Range |
Custom specified by application (UV, VUV, EUV) |
|
Groove Density |
Custom specified per optical design |
|
Diffraction Order |
Custom specified |
|
Radius of Curvature |
Custom specified |
|
Substrate Material |
Custom specified (e.g., optical glass, fused silica, Zerodur) |
|
Optical Coating |
Custom specified per wavelength requirement |
|
Grating Dimensions |
Custom specified |
|
Clear Aperture |
Custom specified |
|
Surface Quality |
Custom specified (e.g., 20-10 scratch-dig) |
|
Surface Roughness |
Custom specified (RMS < nm level) |
|
Diffraction Efficiency |
Application- and coating-dependent (verified with test conditions) |
A Seya-Namioka spectrometer utilizes a concave diffraction grating as a core optical element for simultaneous wavelength dispersion and focusing. This configuration was specifically engineered for monochromators and spectrometers where fixed optical paths and scanning geometry are critical system constraints.
Holographic concave gratings provide superior control over optical aberrations through customized recording geometries. Published research on Seya-Namioka systems highlights aberration-corrected holographic concave gratings and their enhanced flat-field imaging capabilities.
For flat-field configurations, selecting a grating requires evaluating more than just line density. The optic must seamlessly integrate with your intended:
- Entrance and exit slit configurations
- Detector position and focal plane requirements
- Operating wavelength range and incidence geometry
- System focal characteristics
Key Parameters for Grating Selection
Operating Wavelength
Your target wavelength range dictates the grating design, diffraction order, and coating requirements. For UV, VUV, and EUV systems, coating selection critically impacts usable efficiency.
Groove Density
Groove density determines the angular dispersion of the grating and directly impacts spectral resolution and optical layout. It should never be selected in isolation; it must be evaluated alongside wavelength, diffraction order, focal geometry, slit width, and detector specifications.
Radius of Curvature and Optical Geometry
For concave gratings, the radius of curvature is a fundamental system-level parameter. It governs the focusing geometry, determining the position and optical quality of the spectral image. Specify this alongside your complete focal geometry and Seya-Namioka configuration.
Flat-Field Performance
Flat-field performance is essential when detectors or focal planes must cover a wide, continuous spectral range. OEM applications should provide complete focal-plane geometry or optical design data instead of relying on generic catalogue descriptions.
Diffraction Efficiency
Efficiency must always be evaluated in conjunction with test conditions, including:
Wavelength and diffraction order
Polarization state and incidence angle
Groove profile and optical coating
Measurement method
Optical Coatings
Coatings are selected based on operating wavelength and required reflectance/efficiency. For short-wavelength applications (such as EUV), specialized multilayer coatings are implemented to achieve wavelength-selective enhancement. Specify coatings as an integral part of your optical prescription.
Typical Applications
The company conducted a competitive advantage analysis to identify its strengths and weaknesses compared to its rivals.
Seya-Namioka Monochromators
Serves as the primary dispersive and focusing element in compact, controlled wavelength-scanning layouts.
UV and VUV Spectroscopy
Integrates grating, slit geometry, detector position, and optical paths into a unified vacuum-ultraviolet system.
EUV Spectroscopy
Utilizes specialized multilayer-coated configurations where efficiency depends strictly on short-wavelength characteristics.
OEM Spectrometer Development
Delivered as a high-precision optical component customized to instrument manufacturers' exact optical prescriptions.
OEM and Custom Grating Requirements
For OEM projects, manufacturing specifications go beyond standard product descriptions. We accommodate comprehensive custom requirements:
Optical Parameters
Groove density and profile
Radius of curvature and recording geometry
Diffraction order, wavelength range, and coating
Efficiency targets and flat-field/imaging performance
Mechanical Parameters
Overall dimensions and substrate geometry
Clear aperture and mounting features
Datum requirements and angular orientation
Strict dimensional tolerances
Inspection and Quality Control
Groove-density verification and radius measurement
Surface-quality and surface-roughness inspection
Coating verification and diffraction-efficiency testing
Comprehensive dimensional inspection reports
As one of the leading seya-namioka flat-field concave holographic grating manufacturers and suppliers in China, we offer a wide range of products with superior quality. Please feel free to wholesale customized seya-namioka flat-field concave holographic grating from our factory. Welcome to view our website for more information.
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