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Lithium fluoride window plate with a rectangular aperture is a high-performance optical component known for its excellent ultraviolet and infrared transmission, superior chemical stability, and resistance to moisture degradation. Manufactured from high-purity LiF, it provides outstanding optical clarity, low refractive index, and durability, making it an essential material for spectroscopy, laser optics, aerospace applications, and precision scientific instruments. Its ability to function in extreme environments ensures reliable performance in advanced optical technologies.
Product Overview
The lithium fluoride rectangular aperture window plate is a high-performance optical component typically made from lithium fluoride crystals. It features a rectangular or square aperture design and is widely used in optical systems as a protective window or part of optical elements for light path transmission and imaging. Lithium fluoride exhibits excellent transmission properties, particularly in the vacuum ultraviolet region, making it ideal for various optical applications such as telescopes, microscopes, lasers, and infrared spectrometers.
Key Features
- Wide Transmission Spectrum: Lithium fluoride has the smallest refractive index among infrared materials, providing a broad transmission range from visible light to infrared, effectively transmitting light across various wavelengths.
- High Transmittance: Lithium fluoride crystals offer excellent optical performance, ensuring efficient light transmission, ideal for optical systems requiring high transmission efficiency.
- Precision Aperture Design: The rectangular aperture design allows for customized adjustment of light transmission, offering precise optical control.
- Protective Function: As a protective window, lithium fluoride effectively isolates the optical system from external environmental influences, ensuring the stability and accuracy of the equipment.
- Easy to Process and Install: Lithium fluoride crystals are easily processed and cut to create rectangular apertures, making them convenient for integration into various optical systems.
Applications
Lithium fluoride window plates (rectangular aperture) are widely used in multiple optical fields, particularly in applications requiring precise optical control, such as:
- Optical System Protection: Used as protective windows for electronic sensors, detectors, and other devices, ensuring the optical system is shielded from external interference.
- Optical Instruments: In telescopes, microscopes, and other optical instruments, these plates facilitate light transmission and optical imaging.
- Laser Systems: Serve as optical components in lasers, helping to control beam transmission and focusing.
- Infrared Spectrometers: In infrared spectral analysis, lithium fluoride window plates optimize light transmission across various wavelengths, enhancing the analysis results.
| Optical Property | Value |
| Transmission Range | 0.11-7 μm |
| Transmittance | >94.8%@0.6μm |
| Reflection Loss | 5.2%@0.6μm (both surfaces) |
| Absorption Coefficient | 5.9×10⁻³@4.3μm |
| Structure | Cubic Crystal System |
| Cleavage Planes | <100 |
| Physical Property | Value |
| Density | 2.639 g/cm³ |
| Melting Point | 848 ℃ |
| Thermal Conductivity | 11.3 W/(m·K) @ 314K |
| Thermal Expansion | 37.0×10⁻⁶/K @ 283K |
| Knoop Hardness | 415 kg/mm² |
| Specific Heat Capacity | 1562 J/(kg·K) |
| Dielectric Constant | 7.33 @ 1 MHz |
| Young's Modulus | 64.79 GPa |
| Shear Modulus | 55.14 GPa |
| Bulk Modulus | 62.03 GPa |
| Poisson's Coefficient | 0.22 |
| Chemical Property | Value |
| Solubility | 2.7 g/L @ 20℃ |
| Molecular Weight | 25.9394 g/mol |
| Parameter | Range |
| Diameter Range | 2-300 mm |
| Thickness | 0.12-60 mm |
| Surface Finish | 80-50, 60-40, 40-20, 20-10, 10-5 |
| Surface Accuracy | λ/2, λ/4, λ/8, λ/10 |
| Parallelism | <3' - 30" |
| Aperture Transmission | >90% |
| Coating | Customizable |
