Beta Barium Borate (β-BaB2O4 or BBO)

Applications:

◇Second, third, fourth and fifth harmonic generation
◇Frequency double, tripling and mixing of Dye and Ti :Sapphire lasers
◇Optical Parametric amplifiers(OPA) and optical parametric oscillators(OPO)

Advantages:

◇Broad phase-matching wavelength range from 409.6 nm to 3500 nm
◇Wide transmission region from 190 nm to 3500 nm
◇Large effective SHG coefficient about 6 times greater than that of KDP crystal
◇High damage threshold of 10 GW/cm2 for 100 ps pulse-width at 1064 nm
◇High optical homogeneity with Δn ~ 10-6/cm
◇Wide temperature-bandwidth of about 55°C(for type I SHG 1064nm)
◇Good Mechanical and physical properties

BBO crystals with different angle cut for various applications are listed as follows:

1) Harmonic generations of Nd:YAG lasers:
1064nm SHG --> 532nm: Type I , q=22.8°, f=0°;
1064nm THG --> 355nm: Type I, q=31.3°, f=0°; Type II q=38.6°, f=30°
1064nm 4HG --> 266nm: Type I, q=47.6°, f=0°;
1064nm 5HG --> 213nm: Type I, q=51.1°, f=0°;

2) OPO and OPA pumped by harmonics of Nd:YAG lasers
532nm Pump --> 680-2600nm: Type I, q=21°, f=0°;
355nm Pump --> 410-2600nm: Type I, q=30°, f=0°; Type II, q=37°, f=30°;
266nm Pump --> 295-2600nm: Type I, q=39°, f=0°;

3) Frequency doubling of dye lasers
670-530nm SHG --> 335-260nm: Type I, q=40°, f=0°;
600-440nm SHG --> 300-220nm: Type I, q=55°, f=0°;
444-410nm SHG --> 222-205nm: Type I, q=80°, f=0°;

4) Harmonic generations of Ti:Sapphire lasers
700-1000nm SHG --> 350-500nm: Type I, q=28°, f=0°;
700-1000nm THG --> 240-330nm: Type I, q=42°, f=0°;
700-1000nm FHG --> 210-240nm: Type I, q=66°, f=0°;

5) Frequency doubling and tripling of alexandrite lasers
720-800nm SHG --> 360-400nm: Type I, q=31°, f=0°;
720-800nm THG --> 240-265nm: Type I, q=48°, f=0°;

6) Intracavity SHG of Ar+ laser with brewster angle cut
514nm SHG --> 257nm: Type I, q=51°, f=0°, B-cut;
488nm SHG --> 244nm: Type I, q=55°, f=0°, B-cut;