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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-13830

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="" 632.8nm="" for="">=7m

<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%< td=""> a)AR@10664nm,R<0.1%< td="">
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%


crystal birefringent YVO4


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