Beta-Barium Borate,β-BaB2O4,BBOBBO

The main advantages of BBO:

• Broad phase matching second-harmonic-generation (SHG) range from 409.6nm to 3500nm

• Wide transmission region from 190nm to 3500nm

• Large effective SHG coefficient

• High damage threshold of 10 GW/cm2 for 100 ps pulse-widths at 1064nm

• High optical homogeneity with Dn 10-6/cm2

• Wide temperature bandwidth of about 55° (for type I SHG 1064nm)

• Good mechanical and physical properties

The main application of BBO crystals:

• Second, third, fourth and fifth harmonic generation of Nd:YAG

• Frequency-doubling, -tripling and -mixing of dye lasers

• Optical parametric amplifiers (OPA) and optical parametric oscillators (OPO)

• Second, third, fourth and fifth harmonic generation of Ti: sapphire and alexandrite

• Frequency-doubling of Argon ions, Cu vapor and ruby lasers

• External intra-cavity SHG

KTP

Potassium Titanyl Phosphate (KTiOPO4 or KTP) is widely used in both commercial and military lasers including laboratory and medical systems, range-finders, lidars, optical communication and industrial systems.

KTP crystals are featured by:

♦ Large nonlinear optical coefficient

♦Wide angular bandwidth and small walk-off angle

♦Broad temperature and spectral bandwidth

♦High electro-optics coefficient and low dielectric constant

♦Non-hygroscopic, chemically and mechanically stable

Basic properties of KTP:

♦ Application of KTP：

KTP is the most commonly used material for frequency doubling, frequency mixing and other Nd-doped lasers, particularly at medium and low power density. At present, extra-cavity and intra-cavity frequency doubling Nd: lasers using KTP are gradually taking the place of visible dye lasers and tunable Ti:sapphire lasers. KTP has become a preferred green light source for many industrial, commercial and medical applications.

♦8w green output is available from 15w pumped 0.5% Nd:YVO4 and KTP lasers.

♦ 200w green output is generated from 1w diode pump by using HG’s 2x2x5mm KTP and 3x3x1mm 2%Nd: YVO4 crystal.

♦2-5mw green output can be obtained from 180mw LD pumped Nd:YVO4 and KTP glued crystals.