BBO

BBO (beta-BaB ₂ O₄ ) is a nonlinear optical crystal with combination of number of unique features. Wide transparency and phase matching ranges, large nonlinear coefficient, high damage threshold and excellent optical homogeneity provide attractive possibilities for various nonlinear optical online_orderings.

Capabilities:

1) Aperture: 1x1 ~ 12x12mm
2) Length: 0.02 ~ 25mm
3) Phase matching angle θ and φ: Determined by different kinds of homonic generartion.
4) Phase matching type: Type I or Type II
5) End configuration: Flat or Brewster or Specified

Typical Specification and Tolerance:
1) Angle tolerance: Δθ< ± 0.2°; Δφ< ±0.2°
2) Dimension tolerance: (W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)
3) Flatness: <λ /8 @ 633nm
4) Scratch/Dig code:better than 10/5 Scracth/dig per MIL-O-13830A
5) Parallelism: < 20 arc seconds
6) Perpendicularity: <5 arc minutes
7) Wavefront distortion: <λ/8 @ 633nm
8) Clear aperture: > 90% central area
9) Coating:Protective Coating or Anti-Reflection

Physical and Optical Properties

Crystal Structure	trigonal,space group R3c
Cell Parameters	A=b=12.532Å,c=12.717Å,Z=6
Melting Point	1095+/-5°C
Transition Temperature	925+/-5 °C
Optical Homogeneity	Δn 10 /cm
Mohs Hardness	4.5
Density	3.85 g/cm
Absorption Coefficient	<0.1%/cm (at 1064nm)
Hygroscopic Susceptibility	low
Resistivity	>10 ohm-cm
Relative Dielectric Constant	ε 11/ε0:6.7, ε 33/ε0:8.1
Tanδ < 0.001
Thermal Expansion Coefficients	a, 4x10 /K
(in the range of 25°C-900°C	c, 36x10 /K
Thermal Conductivity	⊥c, 1.2 W/m/K ; \|\|c, 1.6W/m/K

As a result of large thermal acceptance bandwidth, high damage threshold and small absorption BBO well suits for frequency conversion of high peak or average power laser radiation.The large spectral transmission range as well as phase matchability, especially in UV range, makes BBO perfectly suitable for frequency doubling of Dye, Ar+-ion and Copper vapour laser radiation, effective cascade harmonic generation of wide spread Nd:YAG as well as of Ti:Sapphire and Alexandrite laser radiation. Both angle tuned Type 1 (oo-e) and Type 2 (eo-e) of phase matching can be obtained increasing a number of advantages for different online_orderings.SHG phase matching angle dependence on input radiation wavelength is shown in Fig. 1.

Both Type 1 and Type 2 phase matching are used in OPO devices based on BBO crystals and designed for pump at different harmonics (up to fifth) of Nd:YAG lasers. Type 1 of interaction gives a larger tuning range and higher parametric amplification rate comparing to type 2 of interaction, while using type 2 interaction you are obtaining narrower bandwidth of output as shown in Fig.2. Parametric gain in BBO is about10 times higher then in KDP in case of 355 nm pump for type 1 interaction. Up to 30% energy conversion efficiency has been obtained using BBO crystal of 12 mm length in OPO device synchronously pumped at 532 nm, which outputs at 640-3170 nm. Because of small acceptance angle and?large walk off, the use of input laser radiation with good beam quality and low divergence is required for efficient conversion.

Standard BBo for SHG

Part No.	Size(mm)	q	f	Coating
BBO001	4x4x7	22.8°	0°	AR/AR@1064&532nm
BBO002	4x4x7	47.6°	0°	AR/AR@532&266nm
BBO003	4x4x10	22.8°	0°	AR/AR@1064&532nm
BBO004	4x4x10	47.6°	0°	AR/AR@532&266nm
BBO005	5x5x2	29.2°	0°	AR/AR@800&400nm
BBO006	5x5x1	29.2°	0°	AR/AR@800&400nm
BBO007	5x5x0.3-0.5	29.2°	0°	AR/AR@800&400nm
BBO008	5x5x0.1	29.2°	0°	AR/AR@800&400nm

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