Chinese supplier nonlinear optical crystal beta barium borate for FHG

Product Overview

Description

Chinese supplier nonlinear optical crystal beta barium borate for FHG

β-Barium borate (β-BaB₂O₄ or BBO) is a nonlinear optical crystal which combines a number of unique features. These features include broad transmission and phase matching ranges, large nonlinear coefficient, high damage threshold, high quality single crystals and excellent optical homogeneity. Therefore, Beta-BaB₂O₄ provides an attractive solution for various nonlinear optical applications. Besides, BBO is one of the best candidates for electro-optical applications due to its excellent electro-optical properties.

BBO crystals have been widely used in non-linear optical applications like OPO, OPA, OPCPA and other. Thanks to its large spectral transmission range as well as phase matching, BBO crystals have been applied in second, third, fourth or fifth harmonic generations for high power visible/UV sources and optical parametric conversions for high power broadly tunable sources. Since its broad gain bandwidth overlaps with Ti:Sapphire in 800 nm range, ultra-high power and high contrast laser systems have been built based on the mixed CPA/OPCPA plan.

 

 Features: Chinese supplier nonlinear optical crystal beta barium borate for FHG

Ø  Wide transmission region from 190 nm to 3500nm

Ø  Large effective second-harmonic-generation (SHG) coefficient

Ø  Good mechanical and physical properties

Ø  High damage threshold of 10 J/cm² for 100 ps pulse-width at 1064 nm

Ø  Broad phase-matching range from 409.6 nm to 3500nm

Ø  Wide temperature-band width of about 55℃

Ø  High optical homogeneity with δn≈10^-6/cm                                                                  

Applications: Chinese supplier nonlinear optical crystal beta barium borate for FHG

Ø  Harmonic generations (up to fifth) of Nd doped lasers

Ø  Frequency doubling and tripling of ultrashort Ti:Sapphire and Dye lasers

Ø  Frequency doubling of Argon ion and Copper vapour laser radiation

Ø  Optical parametric oscillators (OPO) at both Type 1(ooe) and Type 2 (eoe) phase-matching

Ø  Electro-optic crystal for Pockels cells

Ø  Ultrashot pulse duration measurements by autocorrelation

Chemical and Physical Properties: Chinese supplier nonlinear optical crystal beta barium borate for FHG

Property	Value
Chemical formula	BaB2O4
Crystal structure	trigonal, 3m
Lattice Parameter	a=b=12.532Å, c=12.717Å, Z=6
Mass density	3.85 g/cm3
Moh hardness	4
Melting point	About 1095°C
Thermal conductivity	1.2 W/m/K (⊥c); 1.6 W/m/K (//c)
Thermal expansion coefficient	α,4x10-6/K; c,36x10-6/K
Birefringence	negative uniaxial

Linear Optical Properties: Chinese supplier nonlinear optical crystal beta barium borate for FHG

Property	Value
Transparency Range	189 - 3500 nm
Absorption Coefficient:	α<0.1%/cm @1064nm
Refractive Indices at 1.0642 mm at 0.5321 mm at 0.2660 mm	ne = 1.5425, no = 1.6551 ne = 1.5555, no = 1.6749 ne = 1.6146, no = 1.7571
Sellmeier Equations(λ in μm)	no2(λ) = 2.7359+0.01878/(λ2-0.01822)-0.01354λ2 ne2(λ) = 2.3753+0.01224/(λ2-0.01667)-0.01516λ2

Nonlinear Optical Properties: Chinese supplier nonlinear optical crystal beta barium borate for FHG

Property	Value
SHG Phase Matchable Range	409.6 ∼ 3500 nm (Type I); 525 ∼ 3500 nm (TypeII)
NLO coefficients	d11 = 5.8*d36(KDP);d31 = 0.05*d11; d22< 0.05*d11 deff(I)=d31sinθ+(d11cos3φ-d22sin3φ)cosθ deff(II)=(d11sin3φ+d22cos3θ)cos2θ
Therm-Optic Coefficients	dno/dT =-9.3*10-6/°c dne/dT =-16.6*10-6/°c
Electro-Optic Coefficients	g11 = 2.7 pm/V, g22, g31<0.1 g11
Half-Wave Voltage	48 KV (at 1064 nm)
Damage Threshold at 1.064 mm at 0.532 mm	5 GW/cm2 (10 ns); 10 GW/cm2 (1.3 ns) 1 GW/cm2 (10 ns); 7 GW/cm2 (250 ps)

Polishing Specification: Chinese supplier nonlinear optical crystal beta barium borate for FHG

Property	Value
Orientation Tolerence	< 0.5°
Thickness/Diameter Tolerance	±0.05 mm
Surface Flatness	<λ/8@632 nm
Wavefront Distortion	<λ/4@632 nm
Surface Quality	10/5
Parallel	30″
Perpendicular	15′
Clear Aperture	>90%
Chammfer	<0.2×45°

 

Figure 1. SHG tuning curves of BBO

Figure 2. OPO tuning curves of BBO (TypeI (ooe))with different pump light, namely 530 nm, 355 nm and 266 nm

Figure 3. OPO tuning curves of BBO (TypeII (eoe))with different pump light, namely 530 nm, 355 nm and 266 nm

 
  

 

Q1: What is phase mismatching?

A1: A group of techniques for achieving efficient nonlinear interactions in a medium. Many phase-sensitive nonlinear processes, in particular parametric processes such as frequency doubling, sum and difference frequency generation, parametric amplification and oscillation, and also four-wave mixing, require phase matching to be efficient. Essentially, this means ensuring that a proper phase relationship between the interacting waves (for optimum nonlinear frequency conversion) is maintained along the propagation direction. Only if that condition is fulfilled, amplitude contributions from different locations to the product wave are all in phase at the end of the nonlinear crystal.

Q2: What is Second harmonic generation (SHG)?

A2: SHG is a nonlinear optical process, in which photons with the same frequency interacting with a nonlinear material are effectively "combined" to generate new photons with twice the energy, and therefore twice the frequency and half the wavelength of the initial photons.