BBO crystal is an efficient NLO crystal for the second, third and fourth harmonic generation of Nd:YAG lasers, and the best NLO crystal for the fifth harmonic generation at 213 nm. Conversion efficiencies of more than 70% for SHG, 60% for THG and 50% for 4HG, and 200 mW output at 213 nm (5HG) have been obtained, respectively. BBO crystal has the following exceptional properties:

Broad phase-matching range from 410 nm to 2100 nm
Wide optical transmission from 190 nm to 3500 nm
Large effective second-harmonic-generation (SHG) coefficient
High damage threshold of 10 GW/cm2 for 100 ps pulse-width at 1064 nm
Wide temperature-bandwidth of about 55
Low thermo-optic coefficient

BBO crystals with Z-cut is an excellent electro-optical crystal combining good physical properties. it's suitable for high power applications.
It launchs a super Q-switch for a cw diode pumped Nd:YAG laser with average power > 50W.

trigonal, space group R_3c

a = b = 12.532, c = 12.717

N_o²  (l) = 2.7359 + 0.01878 / (l² - 0.01822) - 0.001354l²
N_e² (l) = 2.3753 + 0.01224 / (l² - 0.01667) - 0.01516l²

dn_o/ dT = - 9.3 x 10^-6 / ^oC

 < 0.1 % / cm @1064 nm

@1064 nm

d_ooe = d₃₁sinq + (d₁₁cos3f  - d₂₂sin3f)cosq

d_eoe  = (d₁₁sin3f + d₂₂cos3q)cos²q

48 (@ 1064 nm)

r₁₁= 2.7 pm / V, r_22, r₃₁ < 0.1r₁₁

5 (10 ns), 10 (1.3 ns); (@ 1064 nm)
1 (10ns); 7 (250 ps) (@ 532 nm)

4x4x7, 4x4x10; AR/AR @ 1064& 532 nm
4x4x7, 4x4x10; AR/AR @ 532& 266 nm
5x5x1, 5x5x2, 5x5x0.1,5x5x0.3-0.5, AR/AR @ 800 & 400 nm
3x3x18, 3x3x20; Z-Cut