Sodium Chloride (NaCl) Optical Window

Sodium Chloride (NaCl) Single Crystal Window / Substrate
Product Overview
Sodium Chloride (NaCl) single crystal is a widely used infrared optical material with high transparency in the mid-infrared region. It is commonly used for IR windows, optical substrates, and spectroscopic applications. NaCl crystals provide uniform crystal quality and excellent infrared transmission performance.
Transmission Range: 0.2–25 um
Wavenumber Range: 50000–400 cm^-1
Typical Transmission (>1 mm thickness): >92% in 4000–500 cm^-1 range
In stock. Custom sizes available.
Crystal Orientation
Standard Orientation: (100)
Surface Finish: Double-side polished
Other orientations available upon request.
Material Properties
Crystal Structure: Cubic
Refractive Index: nD = 1.559; n (10 um) = 1.525
Melting Point: 801 °C
Density: 2.165 g/cm^3
Mohs Hardness: 2
Cleavage Plane: {100}
Thermal Expansion Coefficient: 3.76 × 10^-5 /°C
Optical Specifications
Surface Quality: 40-20 scratch/dig (typical)
Surface Flatness: λ/4 @ 633 nm or better
Parallelism: < 5 arc sec
Edge Chamfer: Available upon request
Available Forms
Round windows
Square substrates
Ultra-thin plates
Custom thickness and dimensions available
Applications
Infrared spectroscopy (FTIR)
Infrared optical windows
IR lenses and prisms
Optical filters
Laser windows
Infrared instruments
Important Notice
NaCl is hygroscopic and easily absorbs moisture. Store in a dry environment and avoid exposure to humid air.
Customization
Custom sizes, thicknesses, and crystal orientations are available upon request. Bulk orders are welcome.