Good User Reputation for Crystals For Fhg - BBO Crystal – WISOPTIC

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Good User Reputation for Crystals For Fhg - BBO Crystal – WISOPTIC Detail:

α-BBO is a negative uniaxial crystal with large birefringence and broad transparent range from UV (190 nm) to mid-infrared (3500 nm). α-BBO grown by WISOPTIC has very good internal quality, less absorption, high extinction ratio and high UV transmission. α-BBO is widely used in deep UV and high power laser systems as devices of Gran prisms, polarizing beam splitters, compensator and so on.

ẞ-BBO is an excellent nonlinear crystal with combination of a number of unique features: wide transparency region, broad phase-matching range, large nonlinear coefficient, high damage threshold, and excellent optical homogeneity. Therefore, ẞ-BBO provides an attractive solution for various nonlinear optical applications such as OPA, OPCPA, OPO etc.

ẞ-BBO also has advantages of large thermal acceptance bandwidth, high damage threshold and small absorption, thus is very suitable for frequency conversion of high peak or average power laser radiation, e.g. harmonic generation of Nd:YAG, Ti:Sapphire and Alexandrite laser radiation. ẞ-BBO is the best NLO crystal for the fifth harmonic generation of Nd:YAG laser at 213 nm. Good laser beam quality (small divergence, good mode condition, etc.) is the key for ẞ-BBO to obtain high conversion efficiency.

Contact us for the best solution for your application of BBO crystals.

WISOPTIC Capabilities – BBO

• Aperture: 1×1 ~ 15×15 mm (ẞ-BBO)

• Length: 0.02 ~ 25 mm (ẞ-BBO)；1.0 ~ 40 mm (α-BBO)

• End configuration: flat, or Brewster, or specified

• Top processing (polishing, coating) quality

• Mounting: upon request

• Very competitive price

WISOPTIC Standard Specifications^* - BBO

Dimension Tolerance	± 0.1 mm
Angle Tolerance	< ± 0.25°
Flatness	< λ/10 @ 632.8 nm
Surface Quality	< 10/5 [S/D]
Parallelism	< 10”
Perpendicularity	≤ 5′
Chamfer	≤ 0.1 mm @ 45°
Transmitted Wavefront Distortion	< λ/8 @ 632.8 nm
Clear Aperture	> 90% central area
Coating	AR @ 1064nm（R<0.2%）; PR
Laser Damage Threshold	> 1 GW/cm² for 1064nm, 10ns, 10Hz (polished only) > 0.5 GW/cm² for 1064nm, 10ns, 10Hz (AR-coated) > 0.3 GW/cm² for 532nm, 10ns, 10Hz (AR-coated)
* Products with special requirement upon request.

BBO-2
BBO-1

DOWNLOAD Technical Data – BBO

Main Features - BBO

• Broad transparency range (189-3500 nm)

• Broad phase matching range (410-3500 nm)

• High optical homogeneity（δn≈10^-6/cm）

• Relatively large effective SHG coefficient (about 6 times that of KDP)

• High damage threshold (compared with KTP and KDP)

Comparison of bulk damage threshold [1064nm, 1.3ns]

Crystals	Energy fluence (J/cm²)	Power density (GW/cm²)
KTP	6.0	4.6
KDP	10.9	8.4
BBO	12.9	9.9
LBO	24.6	18.9

Primary Applications – BBO

• 2~5 HG (Harmonic generation) of Nd-doped YAG and YLF laser.

• 2~4 HG of Ti:Sapphire and Alexandrite laser.

• Frequency doublers, triplers, and wave mixers of Dye laser.

• Frequency doublers of Argon ion, Ruby, and Copper vapour laser.

• Widely tunable OPO, OPA, OPCPA of both Type I and Type II phase matching.

Physical Properties – BBO

Chemical formula	ẞ-BaB₂O₄
Crystal structure	Trigonal
Point group	3m
Space group	R3c
Lattice constants	a=b=12.532 Å, c=12.717 Å
Density	3.84 g/cm³
Melting point	1096 °C
Mohs hardness	4
Thermal conductivity	1.2 W/(m·K) (┴c); 1.6 W/(m·K) (//c)
Thermal expansion coefficients	4×10^-6/K (┴c); 36×10^-6/K (//c)
Hygroscopicity	some hygroscopic

Optical Properties – BBO

Transparency region (at “0” transmittance level)	189-3500 nm
Refractive indices	1064 nm	532 nm		266 nm
	n_e=1.5425 n_o=1.6551	n_e=1.5555 n_o=1.6749		n_e=1.6146 n_o=1.7571
Linear absorption coefficients	532 nm		1064 nm
	α = 0.01 /cm		α < 0.001 /cm
NLO coefficients	532 nm		1064 nm
	d₂₂ = 2.6 pm/V		d₂₂ = 2.2 pm/V
Electro-optic coefficients (@632.8 nm, T=293 K)	low frequency		high frequency
	2.2 pm/V		2.1 pm/V
Thermal-optic coefficients	dn_o/dT=-16.6×10^-6/℃, dn_e/dT=-9.3×10^-6/℃
Half-wave voltage	7 kV (at 1064 nm, 3x3x20 mm³)

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