MgF₂ Crystal – Magnesium Fluoride Single Crystal

Description

Magnesium Fluoride (MgF₂) crystal is a high-performance optical single crystal widely used in ultraviolet (UV), visible, and infrared optical systems due to its exceptionally broad transmission range, excellent birefringence, high laser damage threshold, and superior environmental stability. MgF₂ crystals exhibit excellent transmission from the vacuum ultraviolet (VUV) to mid-infrared region, making them ideal for UV optics, excimer lasers, infrared spectroscopy, laser systems, and polarization optics.

As a naturally birefringent crystal, MgF₂ is extensively used for polarizers, waveplates, birefringent prisms, vacuum UV windows, and laser optical components. Its excellent mechanical strength, thermal stability, and moisture resistance make it highly reliable for demanding industrial, aerospace, and scientific applications.

Key Features and Properties

• Ultra-wide transmission range: 0.12 – 9 μm
• Excellent UV and VUV transparency down to ~120 nm
• Low refractive index and low Fresnel reflection loss
• High laser damage threshold
• Natural birefringence suitable for polarization optics
• Excellent thermal and chemical stability
• Non-hygroscopic and moisture resistant
• Low absorption and high optical homogeneity
• Suitable for high-power laser applications

Technical Specifications

Chemical Formula	MgF₂
Crystal Structure	Tetragonal
Space Group	P4₂/mnm
Lattice Constants	a = 4.62 Å, c = 3.05 Å
Density	3.15 g/cm³
Melting Point	~1263 °C
Mohs Hardness	5.5–6
Refractive Index	nₒ≈1.377, nₑ≈1.390
Birefringence	~0.013
Transparency Range	120 nm – 9 μm
Thermal Conductivity	~0.14 W/cm·K
Thermal Expansion	13.7×10⁻⁶ /K (a-axis)
Surface Quality	20/10 or 40/20
Flatness	λ/8 – λ/10
Orientation	C-axis, A-axis
Coating Options	AR / Broadband AR
Applications	UV optics, waveplates, VUV windows, FTIR, laser optics

 

Typical Applications

• UV and VUV optical windows
• Excimer laser optics (193 nm, 248 nm)
• Infrared spectroscopy and FTIR optics
• Waveplates and retarders
• Polarizers and birefringent prisms
• Vacuum ultraviolet optical systems
• Space optics and aerospace instruments
• Laser optics and beam delivery systems
• Fluorescence spectroscopy systems

Material Properties and Crystal Structure

• Chemical Formula: MgF₂
• Crystal Structure: Tetragonal (Rutile-type)
• Space Group: P4₂/mnm
• Lattice Constants:
  • a = 4.62 Å
  • c = 3.05 Å
• Density: 3.15 g/cm³
• Melting Point: ~1263 °C
• Mohs Hardness: ~5.5 – 6
• Refractive Index (@ 550 nm):
  • nₒ ≈ 1.377
  • nₑ ≈ 1.390
• Birefringence (Δn): ~0.013
• Transparency Range: 120 nm – 9 μm
• Thermal Expansion Coefficient:
  • a-axis: ~13.7 × 10⁻⁶ /K
  • c-axis: ~8.5 × 10⁻⁶ /K
• Thermal Conductivity: ~0.14 W/cm·K
• Laser Damage Threshold: High

Standard Specifications

• Orientation: C-axis, A-axis, random orientation available
• Surface Quality: 20/10, 40/20 Scratch-Dig
• Surface Flatness: λ/8 – λ/10 @ 632.8 nm
• Parallelism: < 30 arcsec
• Clear Aperture: >90%

Customization Options

Tinsan Materials provides customized MgF₂ crystal fabrication services:

• Custom orientations (C-axis, A-axis)
• Precision optical polishing
• Custom diameters, thicknesses, and shapes
• AR coating for UV, VIS, or IR wavelengths
• Waveplate and birefringent prism fabrication
• Laser-grade optical finishing
• Tight tolerance machining for aerospace and semiconductor applications

Packaging and Delivery

• Cleanroom-safe packaging
• Anti-static and shockproof protection
• Vacuum-sealed packaging available upon request
• Standard lead time: 2–4 weeks
• Fast global delivery for standard products

Why Choose Our MgF₂ Crystals

• High-purity raw materials for superior UV transmission
• Precision crystal growth and optical polishing
• Excellent optical homogeneity and low absorption
• Custom manufacturing for UV, laser, and aerospace applications
• Strict quality control and inspection process
• Trusted by universities, laboratories, and photonics companies worldwide

Ordering & Contact Information

We offer flexible MOQ (Minimum Order Quantity), competitive pricing and global shipping. For custom orders or technical inquiries, please contact us for a detailed consultation!