Concave Holographic Grating

The concave holographic grating is a key dispersive element in spectroscopic instruments, manufactured by holographic recording technology with a variable-spacing curved-groove structure. It combines both dispersion and imaging functions, allowing a spectrometer to be built with just one optical active surface. Compared with ruled gratings, it offers advantages in aberration correction, signal-to-noise ratio and cost, and is widely used in a variety of spectral analysis applications, providing strong support for accurate detection.

Name: Concave Holographic Grating
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Product Details

TAOMSUNSpectroscopy Core Components

🌏 Made in China · Korea Sales / Technical Support · OEM / ODM Available

TAOMSUN Concave Holographic Grating – Variable-Pitch Aberration-Corrected | High SNR Core Dispersive Element for Spectrometers

Brand: TAOMSUN ｜ Origin: China ｜ Korea Sales / Technical Support: METICULAB (Korea) ｜ Holographic recording · Variable-pitch curved grooves · Aberration correction

The TAOMSUN concave holographic grating is a key dispersive element for spectrometers, manufactured using advanced holographic recording technology with a variable-pitch curved-groove structure. It combines both dispersion and imaging functions, enabling a spectrometer to achieve spectral separation and focusing with just a single optical surface – greatly simplifying the system design. Compared with conventional ruled gratings, its unique aberration-correction capability significantly improves spectral resolution and signal-to-noise ratio, making it the ideal core component for spectral detection in environmental monitoring, materials analysis, biomedicine and other fields.

🔍 Key features: variable-pitch curved-groove design – built-in aberration correction improves spectral purity; holographic recording process – ultra-low stray light, high SNR; concave substrate – combines imaging capability and simplifies the optical system.

📷 Product Gallery

Product overview

Grating detail

Groove structure

Coating options

Spectrometer integration

📋 Technical Specifications

Manufacturing process	Holographic recording (variable-pitch curved grooves)
Substrate material	UV-grade fused silica / optical glass / custom materials
Concave radius of curvature	50 – 1000 mm (customizable)
Groove density	100 – 3600 lines/mm
Blaze wavelength	200 nm – 1200 nm (UV, visible or NIR optional)
Spectral range	190 nm – 1800 nm (depending on coating and design)
Aberration correction	Variable-pitch self-correction (spherical aberration, coma, astigmatism)
Resolution	λ/Δλ > 10000 (typical)
Stray light	< 5×10⁻⁵ (at He-Ne laser line)
Coating	UV-enhanced aluminum, gold or dielectric (optional)
Clear aperture	> 90%
Diffraction efficiency	Peak > 60% (depending on coating and blaze conditions)
Origin	China
Korea Sales / Technical Support	METICULAB (Korea)

📐 Standard Models

Model	Size (mm)	Grooves (lines/mm)	Linear dispersion (nm/mm)	Band (nm)	Entrance arm (mm)	Exit arm (mm)	Angle (°)
A1	32×32×9.5	1200	8	190-850	100	94	61.6
A2	32×32×9.5	1200	8	250-900	100	94	61.6
A3	40×45×10	1200	4	190-850	200	195	61.6

* For other specifications (e.g. different groove density, radius of curvature or spectral band), please contact us for customization.

📊 Performance Advantages (vs. Conventional Ruled Gratings)

Aberration correction	Variable-pitch curved grooves, significantly better than equal-pitch ruled gratings, purer spectrum
Signal-to-noise ratio (SNR)	Holographic recording process, extremely low stray light, high SNR
Imaging capability	Concave substrate provides built-in focusing, simplifies the optical path and reduces components
Service life	No mechanical scratching, stable diffractive structure, excellent repeatability
Cost effectiveness	Replication process enables volume production, better value than ultra-precision ruled gratings

TAOMSUN Concave Holographic Grating Applications

⭐ Key Advantages

✅ Aberration self-correction – variable-pitch design, no extra correcting elements

✅ Ultra-high SNR – holographic process, stray light suppressed to 5×10⁻⁵

✅ Dispersion + imaging in one – concave substrate simplifies the spectrometer optical path

✅ Broad spectral coverage – 190-1800nm, UV to near infrared

✅ High resolution – λ/Δλ > 10000 for precision analysis

✅ High diffraction efficiency – peak > 60%, minimal signal loss

✅ Long-term stability – holographic structure without mechanical stress, consistent performance

✅ Flexible customization – groove density, radius of curvature and coating per requirements

🔬 Applications

UV-VIS spectrometersRaman spectroscopy systemsFluorescence spectrometersEnvironmental monitoring instrumentsMaterial composition analysisBiomedical testingSemiconductor inspectionAstronomical spectroscopy

📦 Customization Service

Full-parameter customization is supported to meet the design requirements of different spectrometers:

Substrate customization: fused silica, optical glass or customer-specified material
Concave curvature: any design within 50-1000mm
Groove density: 100-3600 lines/mm, covering UV to near infrared
Coating customization: UV-enhanced aluminum, gold, dielectric mirror coatings, etc.
Small batch trials: 3-5 pcs to start validation

❓ Frequently Asked Questions (FAQ)

Q: What is the main difference between a concave holographic grating and a plane holographic grating?
A: A concave holographic grating is made on a concave substrate and has built-in focusing capability – it can image without an extra mirror, making the optical path more compact. A plane grating requires a focusing mirror, so the system is larger.

Q: What advantages does a variable-pitch grating offer over an equal-pitch grating?
A: The variable-pitch design actively corrects aberrations (especially spherical aberration and coma), significantly improving spectral resolution and image quality – something a conventional equal-pitch grating cannot achieve.

Q: How do I choose the right groove density for my spectrometer?
A: Groove density determines spectral resolution and bandwidth. High-density grooves (>1800 lines/mm) suit high-resolution UV-VIS applications; low-density grooves (<600 lines/mm) suit wide-bandwidth applications.

Q: Are holographic gratings easy to damage?
A: No. The grooves of a holographic grating are photochemically recorded on a photosensitive layer and then coated, forming a robust structure. As long as physical scratching and strong acid/alkali environments are avoided, its service life far exceeds that of ruled gratings, with long-term stable performance.

Q: Can you provide complete OEM spectrometer grating modules?
A: Yes. TAOMSUN provides complete solutions from grating design to coating, and can work with METICULAB for joint optimization of the optical system.

🏭 About TAOMSUN

TAOMSUN is a professional supplier deeply engaged in precision optical components and core spectroscopy parts, focused on the R&D and supply of holographic gratings, lenses, windows and other optical components. The company is certified under the ISO 9001 quality management system, and its products are widely used in high-end fields such as spectral analysis, environmental monitoring and biomedicine. With decades of precision optical manufacturing experience, a mature supply chain and strict quality control, every product delivers excellent quality and stable delivery. 🌏 Overseas sales and technical support is provided by METICULAB™ (Korea).

TAOMSUN

Spectroscopy Core Components

📧 Sales Inquiry

taomsun@vip.163.com

+86-13862625813

🌏 Overseas Sales / Technical Support

METICULAB™ (Korea)

choikyuc@gmail.com

+82-10-3988-4813

💬 WhatsApp / KakaoTalk

TAOMSUN products are manufactured under the ISO 9001 quality management system. Specifications are typical values and may vary with custom configurations. For OEM/ODM customization, non-standard sizes or special coatings, please contact our sales team. International customers can contact METICULAB (Korea) for Korean/English technical consultation.