Echelle grating

Echelle grating

Supplier
Zeit-group
Category
Beam Splitters
Origin
China

Echelle gratings use very high diffraction angles to concentrate energy in high orders.

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Overview

Echelle gratings use very high diffraction angles to concentrate energy in high orders. For normal incidence at 0°, the grating equation simplifies to nλ=d sin θ′, giving sin θ′=nλ/d. Angular separation between wavelengths therefore increases at higher orders. For example, 600nm and 605nm lines incident on a 31.6-lines/mm grating have an angular separation of 0.009° at N=1 and 0.6° at N=40. The trade-off is a smaller free spectral range, from 630nm (630nm/1) to 15.8nm (630nm/40). A dispersing prism is commonly combined with an echelle for order separation. High-resolution echelles are special low-period gratings designed for high-order operation, generally used with another grating or prism to separate overlapping diffraction orders. Their high blaze angles make them suitable for high-resolution spectroscopy. They are made on precision glass substrates and are described as reaching 80%–90% of theoretical resolution.

Specifications

ParameterValue
MaterialH-K9L(BK7) / Quartz / Glass-ceramic
Optical CoatingMultilayer Dielectric Partially Reflective Coating; Four Faces: Multilayer Antireflection Coating
Surface Figure AccuracyPolished Surface (As Required)
Effective Size95%
Parallelism≤30 arcsec
Surface Quality20-10
Dimensional Tolerance±0.1mm

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Supplier Information

Ze
Zeit-group
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Chengdu Zhongke Zhuoer Intelligent Technology Group Co., Ltd. is a leading enterprise in the field of optics and semiconductors, recognized as a National High-Tech Enterprise, a Sichuan Province “Specialized, Refined, Distinctive, and Innovative” “Little Giant” Enterprise, a Chengdu New Economy “Double Hundred” Enterprise, and a Chengdu High-Tech Zone “Four Categories of High-Level Talent” Enterprise. Leveraging its exceptional technical capabilities—including independent R&D, patented technologies, and technological innovation—the company has achieved breakthroughs in ultra-precision polishing, precision inspection, and coating processes in the chip and display sectors. Its key products include high-end quartz blank masks, precision optical components and active devices, precision inspection equipment, and high-performance coating technology services, establishing the company as a core technology-driven enterprise with a competitive supply chain advantage in replacing imported products with domestically produced alternatives. To date, the company has been granted over 80 patents and collaborates with five affiliated institutions and scientific research units. It has established a precision optical processing production base and a precision optical system assembly and calibration center. The company has forged deep industry-academia-research partnerships with global research institutes, renowned universities, and industry associations in the optoelectronics field. Grounded in high-level scientific and technological self-reliance, it is committed to conquering key core technologies, continuously accumulating technical expertise, and tackling key process challenges, striving to become a leading enterprise in the development and industrialization of high-tech optoelectronic products. Through continuous efforts, Zhongke Zhuoer has achieved one qualitative leap after another. In the future, the company will deepen collaborative partnerships along the industry value chain to enhance its core capabilities, embrace innovation, and contribute to the development of critical upstream materials and integrated process technologies for China’s optoelectronics industry.

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Echelle grating
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