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1.BIREFRIGENT CRYSTAL

Physical and Optical Properties

Transparency Range

500-4000nm

350-2300nm

190-3500nm

 Crystal Structure

Trigonal

Trigonal,

Trigonal,Space Group R3c

Crystal Class

Positive Uniaxial

Positive Uniaxial

Negative Uniaxial

Crystal Cell

a=b=7.12 Å,c=6.29 Å

a=6.37 Å

a=b=12.532 Å,c=12.717 Å

Density

4.22g/cm3

2.7g/cm3

3.85g/cm3

Hygroscopic Susceptibility

High

Low

Low

Mohs Hardness

5

3

4.5

Thermal Expansion Coefficients

aa=4.43*10?6/k

ac=11.37*10?6/k

aa=24.39*10?5/k

ac=5.68*10?5/k

Aa=4*10?6/k

Ac=36*10?6/k

Optical Homogeneity

10?6/cm

10?6/cm

10?6/cm

Absorption Coefficient

<0.1%@1064nm

<0.1%@1064nm

<0.1%@1064nm

Refractive Index,

Birefringence(?n=ne-no)

Walk-Off Angle@45°(?)

ne=2.2154,No=1.9929

?      n=0.2251

?=6.042°@633nm

ne=1.48520,no=1.6557

?      n=0.1705

?=6.20°@633nm

ne=1.54381,no=1.67056

?      n=0.1222

?=4.345°@532nm

Capabilities

Diameter

Max.30-40mm

Max.150mm

Max.40-50mm

     Length

Max.25-35mm

Max.100mm

Max.25-35mm

    Surface Quality

Better than 20/10 Scratch/Dig Per MIL-0-13830A

Beam Deviation

<10arc seconds

Optical Axis Orientation

+/-0.2°

Flatness

<?/8@633nm

Transmission Wavefront Distortion

<?/4@633nm

Coating

Upon Specification

2. BIREFRIGENT CRYSTAL

Physical and Optical Properties

Transparency Range

420-5200nm

120-8500nm

200-2300nm

 Crystal Structure

Trigonal,Space Group R3c

Trigonal,Space Group R3c

Trigonal,Space Group R3c

Crystal Class

Positive Uniaxial

Positive Uniaxial

Negative Uniaxial

Crystal Cell

a=5.14Å

a=b=4.621 Å,c=3.053 Å

 

Density

4.64g/cm3

3.18g/cm3

2.65g/cm3

Hygroscopic Susceptibility

Low

Low

Low

Mohs Hardness

5

 

6

7

Thermal Expansion Coefficients

aa=2.0*10?6/k@25?

ac=2.2*10?6/k@25?

 

aa=6.23-9.25*10?6/k

ac=10.86-14.54*10?6/k

aa=6.2*10?6/k

ac=10.7*10?6/k

Optical Homogeneity

5*10?5/cm

10?6/cm

10?6/cm

Absorption Coefficient

<0.1%/cm@1064nm

0.07at 0.2um;0.02 at 5.0um

 

<0.1%/cm@1064nm

Refractive Index,

Birefringence(?n=ne-no)

Walk-Off Angle@45°(?)

ne=2.20263,no=2.28629

?      n=0.08366

?=2.135°@633nm

ne=1.38876,No=1.37698

?      n=0.01178

?=0.488°@633nm

ne=1.55170,No=1.54265

?      n=0.00905

?=0.335°@532nm

 

Capabilities

Diameter

Max.30-40mm

Max.50mm

Max.100mm

     Length

Max.25-35mm

Max.100mm

Max.100mm

    Surface Quality

Better than 20/10 Scratch/Dig Per MIL-0-13830A

Beam Deviation

<10arc seconds

Optical Axis Orientation

+/-0.2°

Flatness

<?/8@633nm

Transmission Wavefront Distortion

<?/4@633nm

Coating

Upon Specification