LBO crystal, Lithium Triborate, LiB3O5, is a nonlinear optical crystal. For frequency doubling (SHG)/ tripling(THG) of Nd:YAG, Nd:YLF, Nd: YVO4 lasers, LBO crystal is one of the most useful nonlinear optical materials in ultraviolet and visible laser applications.LBO crystal is unique in many aspects,especially for its wide transparency range,moderately high nonlinear coupling, high damage threshold and good chemical and mechanical properties.LBO crystal allows temperature-controllable non-critical phase-matching( NCPM) for Type I SHG, and also provides room temperature NCPM for type II SHG. It possesses a relatively large angular acceptance bandwidth, reducing the beam quality requirements for source lasers. LBO crystal is also a good choice for THG to 355nm. 

LBO is a nonlinear optical crystal with combination of a number of unique features:

•  broad transparency range from 160nm to 2600nm.

•  high optical homogeneity (dn»10-6/cm) and free of inclusion;

•  relatively large effective SHG coefficient (about three times that of KDP);

•  high damage threshold;

•  wide acceptance angle and small walk-off;

•  type I and type II non-critical phase matching (NCPM) in a wide wavelength range;

LBO is perfectly suitable for various nonlinear optical applications: 

• More than 480mW output at 395nm is generated by frequency doubling a 2W mode-locked Ti:Sapphire laser

(<2ps, 82MHz) The wavelength range of 700-900nm is covered by a 5x3x8mm3 LBO crystal.

• Over 80W green output is obtained by SHG of a Q-switched Nd:YAG laser in a type II 18mm long LBO crystal.

• The frequency doubling of a diode pumped Nd:YLF laser (>500µJ @ 1047nm, <7ns,

0-10KHz) reaches over 40% conversion efficiency in a 9mm long LBO crystal

• The VUV output at 187.7 nm is obtained by sum-frequency generation.