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     Ti:Sapphire
Home >> Laser Crystal >> Ti:Sapphire 
Physical and Optical Properties
Chemical formula Ti 3+ : Al 2 O 3
Crystal structure Hexagonal
Melting point 2050 C
Density 3.98 g/cm³
Mohs hardness 9
Thermal conductivity Coefficient 0.11 cal/(C x sec x cm)
Thermal Expansion Coefficient
Lasing Wavelength 660-1050 nm (795 nm)
Absorption range 400-600 nm (488 nm)
Lattice constants a = 4.748, c = 12.957
Fluorescence lifetime 3.2 msec (T = 300 K)
Absorption Coefficient 1.0-7.5cm -1 @490nm
Refractive index 1.76 @ 800 nm
Polarized Emission Unpolarized
Typical Specification and Tolerance
conentration 0.06-0.5 wt% Ti dopant
Figure of Merit 100~300
Aperature 2~50mm
Path Length 2~130mm
End configuration flat/flat or Brewster/Brewster ends or Specified
Orientation Optical axis C normal to rod axis
Parallelism <10 arc seconds
Surface quality better than 60/40 scratch/dig per MIL-O-13830A
Surface flatness </10 @633nm
Wavefront distortion </4 per inch @ 633 nm
Perpendicularity < 5 arc minutes
Clear aperture Central 90%
Chamfer 0.15x44
Damage threshold over 15J/cm 2 (rods without coating) over 700MW/cm 2 (coating)
Coatings AR@700-1100nm