LMD

Non-Linear Crystals

	BBO

	BIBO

	KDP/KD*P

	KTP/SKTP

	KNbO3 Crystal

	KTA

	RTP

	α-LiIO3 Crystal

	BaTiO3 Crystal

Beta-Barium Borate (BBO)

Applications

1.Second,third,fourth and fifth harmonic generations of Nd:lasers;Frequency-doubling,-tripling and -mixing of Dye lasers;
2.Second, third & fourth harmonic generations of Ti:Al₂O₃ and Alexandrite lasers;
3.Optical parametric amplifiers(OPA) and optical parametric oscillators(OPO);
4.Frequency-doubling and-tripling of ultrashort pulse Ti:Sapphire and Dye Lasers;
5.Frequency-doubling of Argon ion, Cu-vapor and Ruby lasers; External intracavity SHG;

1.Structural and Physical Properties

Chemical formula	β-BaB₂O₄
Crystal Structure	trigonal,space group R_3c
Cell Parameters	a=8.4473Å, b=7.3788Å , c=5.1395Å , Z=2
Melting Point	1095±5℃
Transition Temperature	925±5℃
Optical Homogeneity	Δn≈10-6/cm
Mohs Hardness	4.5
Density	3.85g/cm³
Linear Absorption Coefficients	α<0.001cm-1 (λ=1064nm) α<0.01cm-1 (λ=532nm) α<0.5cm-1 (λ=255nm)
Hygroscopic Susceptibility	Low
Resistivity	>1011ohm-cm
Relative Dielectric Constant	εT11/εo:6.7, εT33/εo:8.1,Tan δ,<0.001
Thermal Expansion Coefficients (in the range of 25℃-900℃) Thermal Conductivity	a, 4×10-6/K c, 36×10-6/K ┴c ,1.2w/m/k;║c,1.6 w/m/k

2.Linear Optical Properties

Transparency Range: 189-3500nm,See Transparency Curve
Refractive Indices:
at 1.0642 μm ne=1.5425, no=1.6551
at 0.5321 μm ne=1.5555, no=1.6749
at 0.2660 μm ne=1.6146, no=1.7571
Therm-Optic Coefficients:
dno/dT=-9.3×10-6/℃ dne/dT=-16.6×10-6/℃
Sellmeier Equations:
N2o(λ)=2.7359+0.01878/(λ2-0.01822)-0.01354×λ2 (λ in μm, T=20℃)
N2e(λ)=2.3753+0.01224/(λ2-0.01667)-0.01516×λ2 (λ in μm, T=20℃)

3.NonLinear Optical Properties

Phase-Matchable Output Range: 189-1750nm
NLO Coefficients: d11=5.8×d36(KDP)
Electro-optic Coefficients:
d31=0.05×d11, d22<0.05×d11
γ11=2.7pm/V, γ22 , γ31<0.1γ11
Half-Wave Voltage: 48KV(at 1064nm)
Damage Threshold:
at 1.064 μm 5GW/cm2(10ns);10GW/cm2(1.3ns);
at 0.532 μm 1GW/ cm2(10ns);7GW/cm2(250ps);
at 0.266 μm 12mW/cm2(8ns).

4.BBO's Main Specification

Transmitting wavefront distortion	<Lambda/8@633nm
Dimension tolerance	±0.1mm
Flatness	< Lambda/8@633nm
Perpendicularity	<5 arc minutes
Parallelism	<15 arc seconds
Suface Quality	10/5 Scratch/Dig Per Mil-O-13830A
Angle tolerance	Theta<± 0.5°,phi<±0.5°
Coating	AR R<0.2%@1064&532nm ect.,