Single-Layer Magnesium Fluoride Coating
Single-layer magnesium-fluoride coatings. Magnesium fluoride is among the earliest and most common high-performance optical-coating materials. Changchun Longze Precision Optical Instrument Co., Ltd. has years of coating-process experience and a high-quality, economical, practical system. Contact us for reliable supply. AR coatings offer low index (N=1.38), low loss, 120nm-8000nm transmission, high mechanical strength, and high laser damage threshold, particularly for UV optics. Vacuum evaporation forms hard, durable coatings. Key factors: since establishment, the company has developed economical practical techniques and a mature coating system, providing single-layer AR coatings to requirements. 1. Thickness/uniformity: thickness governs wavelength-dependent AR effects; uniformity affects stability/reliability. 2. Raw-material form: powder contains many pores and crystal water. Premelting/coating may cause disproportionation producing magnesium oxide and hydrogen fluoride. Pores/outgassing abruptly reduce vacuum or cause splashing, extending cycles, lowering quality, and raising index. Pressed flakes have fewer pores but residual gas/crystal water still cause outgassing, splashing, and index deviations. Crystalline material receives low-temperature vacuum pretreatment and high-temperature degassing for uniform structure and minimal outgassing/splashing/unwanted reactions. 3. Evaporated mass: good raw materials are essential for ideal thickness d=λ/4N and AR performance. Actual evaporated mass, distinct from nominal amount, is linear with thickness d. 4. Source: choose evaporation for material properties. For small particles or low-melting materials such as magnesium fluoride, resistive evaporation is easier to control than electron beams and avoids contamination. 5. Placement: substrates near rotating-holder centers receive thicker, more uniform coatings than edge substrates. The company uses effective solutions and strictly tests every coated optic with professional equipment. Contact: talia@clzoptics.com.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Surface Reflectance Before Coating [Uncoated Glass] | 4％ |
| Surface Reflectance After Coating [Uncoated Glass] | 1.3％ |
| Refractive Index [K9] | 1.52 |
| Surface Reflectance Before Coating [K9] | 4.25% |
| Surface Reflectance After Coating [K9] | 1.3% |
| Refractive Index [BK7] | 1.517 |
| Surface Reflectance Before Coating [BK7] | 4.25% |
| Surface Reflectance After Coating [BK7] | 1.3％ |
| Refractive Index [Sapphire] | 1.77 |
| Surface Reflectance Before Coating [Sapphire] | 4.93％ |
| Surface Reflectance After Coating [Sapphire] | 1.8％ |
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