Ruby optical window High transmittance Mohs Hardness 9 laser mirror protection window

Short Description:

The ruby optical window is a high performance optical element based on a high purity synthetic ruby (alpha-Al ₂O₃:Cr³ +) single crystal, prepared using advanced crystal growth techniques such as heat exchange or pull method. As an engineering grade special optical window, it not only has the light transmission characteristics of traditional optical glass, but also has superior mechanical strength and extreme environmental tolerance. This type of window is usually made using a precision optical machining process, with a surface finish of up to 5/1 (scratch-dig), and can be coated specifically to meet the needs of the application. Under harsh conditions such as high pressure, high temperature and corrosive environments, ruby Windows show irreplaceable performance advantages and are indispensable key optical components in high-end industrial equipment, scientific instruments and special observation systems.

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Product Detail

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Ruby optical window features:

1. Optical characteristics:
The transmittance band covers the visible range of 400-700nm and has a characteristic absorption peak at 694nm
Refractive index 1.76 (@589nm), birefractive index 0.008, anisotropy is obvious

Surface coating optional:

Broadband anti-reflection film (400-700nm, average reflectance < 0.5%)

Narrow band filter (bandwidth ±10nm)

High reflective film (reflectance > 99.5%@ specific wavelength)

2. Mechanical characteristics:
Mohs hardness level 9, Vickers hardness 2200-2400kg/mm²
Flexural strength > 400MPa, compressive strength > 2GPa
Elastic modulus 345GPa, Poisson's ratio 0.25
Machining thickness range 0.3-30mm, diameter up to 200mm

3. Thermal characteristics:
Melting point 2050℃, maximum working temperature 1800℃ (short term)
Thermal expansion coefficient 5.8×10⁻⁶/K (25-1000℃)
Thermal conductivity 35W/(m·K) @25℃

4. Chemical properties:
Acid and alkali corrosion resistance (except hydrofluoric acid and hot concentrated sulfuric acid)
Excellent oxidation resistance, stable in high temperature oxidation environment
Good radiation resistance, can withstand 10⁶Gy radiation dose

Ruby optical window application:

1. High-end industrial field:
Oil and gas industry: Pressure-resistant viewing window for downhole camera systems, up to 150MPa working pressure
Chemical equipment: reactor observation window, strong acid and alkali corrosion resistance (pH1-14)
Semiconductor fabrication: Viewing window for plasma etching equipment, resistant to corrosive gases such as CF₄

2. Scientific research instruments:
Synchrotron radiation light source: X-ray beam window, high thermal load capacity
Nuclear fusion device: vacuum viewing window, resistant to high temperature plasma radiation
Extreme environment experiment: high pressure and high temperature cavity observation window

3. National Defense Industry:
Deep sea probe: withstand pressure up to 1000 atmospheres
Missile seeker: High overload resistance (> 10000g)
Laser Weapon Systems: High power laser output window

4. Medical Equipment:
Output window of medical laser
Observation window of autoclave equipment
Optical components of extracorporeal lithotriptor

Technical parameters:

Chemical Formula	Ti3+:Al2O3
Crystal Structure	Hexagonal
Lattice Constants	a=4.758, c=12.991
Density	3.98 g/cm3
Melting Point	2040℃
Mohs Hardness	9
Thermal Expansion	8.4 x 10-6/℃
Thermal Conductivity	52 W/m/K
Specific Heat	0.42 J/g/K
Laser Action	4-Level Vibronic
Fluorescence Lifetime	3.2μs at 300K
Tuning Range	660nm ~ 1050nm
Absorption Range	400nm ~ 600nm
Emission Peak	795 nm
Absorption Peak	488 nm
Refractive Index	1.76 at 800nm
Peak Cross Section	3.4 x 10-19cm2

XKH Service

XKH offers full process customization of ruby optical Windows: This includes raw material selection (adjustable Cr³ concentration 0.05%-0.5%), precision machining (thickness tolerance ±0.01mm), optical coating (anti-reflection/high reflection/filter film system), edge strengthening treatment (explosion edge design) and rigorous quality testing (transmittance, pressure resistance, laser damage threshold tests). Support non-standard size customization (diameter 1-200mm), small batch trial production (up to 5 pieces) and mass production, provide complete technical documentation and after-sales support to ensure the reliable performance of products in various harsh environments.