LBO
crystals is an excellent nonlinear crystal. For frequency
doubling(SHG),tripling(THG) of Nd:YAG,Nd:YLF,Nd:YVO4 lasers, it is
one of the most useful nonlinear optical materials in ultraviolet
and visible laser applications.
Advantages:
•
broad transparency range from **0nm to ***0nm (see Figure
1);
•
high optical homogeneity (δn≈*0*6/cm)
and being free of inclusion;
•
relatively large effective SHG coefficient (about three times that
of KDP);
•
wide acceptance angle and small walk-off;
•
type I and type II non-critical phase matching (NCPM) in a wide
wavelength range;
•
spectral NCPM near ***0nm.
•
high damage threshold(*8.9 GW/cm 2 for a 1.3ns laser at
***3nm);
LBO
has the highest damage threshold in all the commonly-used inorganic
NLO crystals. Therefore, it is the best candidate for high average
power SHG and other nonlinear optical processes.
Comparison of
Bulk Damage Threshold (@********************>
Crystal
Energy
Density (J/cm 2 )
Power
Density (GW/cm 2 )
Ratio
KTP
KDP
BBO
LBO
6.0
*0.9
*2.9
*4.6
4.6
8.4
9.9
*8.9
1.*0
1.*3
2.*5
4.*0
LBO's
main applications
• SHG,
THG of Nd lasers
• SHG
of Ti:Sapphire, Cr:LiSAF and Alexandrite lasers
