Optic Window Baf2 Crystal For Spectroscopic Ellipsometer

Product Overview

Description

Product Description                                                                                                     

 

1. Use in windows, lenses of special types of objectives, as mirrors substrate.

2. The transmission range of BaF2 is from 0.2 to 14µm.

3. Suitable for applications in the IR band (8 to 14 µm)

4. Used as an IR viewport window for thermographs.

5. Grown by vacuum Stockbarger technique. 

Features                                                                                                                         

Excellent Transmission from 200nm to 7μm;

The most resistant fluoride to high energy radiation;

Sensitive to thermal shock

Applications                                                                                                                  

BaF2 lens

BaF2 wedges

BaF2 window

Infrared thermometer

Infrared thermal imager

 

Polishing Specification                                                                                                

Main Specification	Conventional	High Precision
Orientation	<001> or <100>, < ±0.5°	<001> or <100>, < ±0.2°
surface Quality	40//20	10//20
Wavefront Distortion	λ/4@632nm	λ/8@632nm
Surface Flatness	λ/4@632nm	λ/8@632nm
Clear Aperture	>95%	>90%
Chammfer	<0.2×45°	<0.2×45°
Thickness/Diameter Tolerance	±0.1 mm	±0.1 mm
Maximum dimensions	dia200×50mm	dia200×50mm

Physical and chemical properties                                                                             

 

Crystal Structure	cubic, CaF2 type structure
Cleavage Planes	(111)
Density	4.89 g/cm3
Melting Point	1386°C
Thermal Conductivity	11.72 W/(m·K) @13°C
Specific Heat	410 J/(kg·K) @27°C
Thermal Expansion	18.1 · 10-6/°C (-100°C, +120°C)
Hardness (Knoop)	82(500g)
Young`s Modulus	56.4 GPa
Shear Modulus	25.4 GPa
Bulk Modulus	268.89 GPa
Rupture Modulus	26.2 MPa
Elastic Coefficient	C11 = 90.4 ; C12 = 40.6 ; C44 = 25.3 GPa
Apparent Elastic Limit	26.89 MPa
Dielectric Constant	7.33 @f = 2 MHz
Solubility in Water	0.17g /100g @23°C
Energy Gap:	9.1eV
Standard Diameter	dia100 mm

 

dn/dT	-15.2 x 10-6/oC
Poisson Ratio	0.343
Transmission Range	0.15 - 15 µm
Refractive Index	1.45 at 5 μm
Reflective Loss	7.7% @0.6 µm; 6.0% @4.0 µm

 

Transmittance of BaF2