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.

🔍 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.

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

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.

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).