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     Overview
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LASER CRYSTAL

Physical and Optical Properties

Chemical Formula

Ti3+:Al2O3

Nd:Y3Al5O12

Nd:YVO4

 Crystal Structure

Hexagonal

Cubic

Zircon Tetragonal,Space Group D4h

Melting Point

2050

1970

Density

3.98g/cm3

4.56g/cm3

4.22g/cm3

Mohs Hardness

9

8.5

5

Thermal Conductivity Coefficient

0.11 cal/(*sec*cm)

14W/m/K@20

10.5 W/m/K@100

C:5.23W/m/k

ˆC:5 .10W/m/k

Thermal Expansion Coefficient

7.8*10-6/k [111],0-250

Aa=4.43*10-6/k

Ac=11.37*10-6/k

Lasing Wavelength

660-1050nm(795nm)

1064nm

914nm,1064nm,1342nm

Absorption Range

400-600nm

Lamp pump

808nm

Lattice Constants

a=4.748,c=12.957

12.01

a=b=7.12,c=6.29

Fluorescence Lifetime

3.2 m sec(T=300K)

230msec

90msec(about 50ms for 2 atm%Nd doped)@808nm

Absorption Coefficient

1.0-7.5cm-1@490nm

7.1cm-1

31.4cm-1@808nm

Refractive Index

1.76@800nm

1.82@1064nm

No=1.9573,ne=2.1652@1064nm

Polarized Emission

    Unpolarized

Unpolarized

Parallel to Optic Axis(C-axis)

Capabilities

Concentration

0.06-0.5 wt%Ti dopant

0.5-1.2 atm%Nd dopant(10% tolerance)

0.2-3 atm%Nd dopant(10% tolerance)

    Figure of Melt

100-300

    Aperture

2-50mm

3-14mm

1-20mm

    Path Length

2-130mm

1-60mm

0.02-20mm

End Configuration

Flat/Flat or Brewster/Brewster Ends or Specified

LASER CRYSTAL

Laser Crystal

Ti:Sapphire

Nd:YAG

      Nd:YVO4

     Orientation

Optical Axis C Normal to Rod Axis

<111>Crystalline Direction(+/-0.5)

a-cut Crystalline Direction(+/-0.5)

Parallelism

<10 arc seconds

      Surface Quality

Better than 60/40 Scratch/Dig

Per MIL-O-13830A

Better than 20/10 Scratch/Dig

Per MIL-O-13830A

Better than 20/10Scratch/Dig

Per MIL-O-13830A

Surface Flatness

<λ/10@633nm

<λ/10@632.8nm

<λ/10@632.8nm

Wavefront Distortion

<λ/4 per inch@633nm

<λ/10 @632.8nm for3-7mm

<λ/8 per inch@632.8nm for>=7mm

<λ/8@633nm

Perpendicularity

<5 arc minutes

<5 arc minutes

<5 arc minutes

Clear Aperture

Central 90%

Central 95%

Central 95%

Chamfer

0.15*44°

0.15*45°

0.15*45°

Damage Threshold

Over 15J/cm2(Rods without Coating) over 700MW/cm2(Coating)

Over 15J/cm2(Rods without Coating) over 700MW/cm2(Coating)

Over 15J/cm2(Rods without Coating) over 700MW/cm2(Coating)

Coatings

AR@700-1100nm

a)AR@10664nm,R<0.1%

a)AR@10664nm,R<0.1%

b)AR@1064nm,R<0.1%;HT@808nm,T>95%

b)AR@1064nm,R<0.1%;HT@808nm,T>95%

c)HR@1064nm,R<99.8%;HT@808nm,T>95%

c)HR@1064nm,R<99.8%;HT@808nm,T>95%

d)HR@1064nm,R<99.8%;HT@808nm,T>95%;HR@532nm,R>99%

d)HR@1064nm,R<99.8%;HT@808nm,T>95%;HR@532nm,R>99%