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You are here: Home / Laser Products / Nonlinear Crystal / BBO Crystals
BBO nonlinear optical crystals laser crylink

BBO Crystal - Beta barium borate crystal

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β-BBO Crystal—a widely used nonlinear crystal for frequency conversion in the ultraviolet, visible and near-infrared

BBO Crystal is one of the essential nonlinear optical crystals. Beta-barium borate (β-BaB2O4,β-BBO) combines many outstanding features such as its high nonlinear optical coefficients and low group-velocity dispersion, broad transparency range (189–3500 nm) high damage threshold. This unique combination ensures that β-BBO crystal is a promising candidate for nonlinear optical applications such as frequency converters and optical parametric oscillators. In quantum optics, β-BBO crystal can generate entangled photon pairs and ten-photon entanglement.

BBO nonlinear crystal is a negative uniaxial crystal. It provides phase matching for various second-order interactions almost over its entire transparency range. This transparency ranges from 185 nm to 3.3 µm, as inferred from transmittance measurements using crystal samples of a few mm thickness. It is widely used for nonlinear frequency conversion in the ultraviolet, visible, and near-infrared. The BBO crystal is the most critical nonlinear crystal for near-infrared optical parametric chirped-pulse amplifiers, which currently deliver few optical cycle pulses with high average and ultrahigh peak powers.

Parameter

Physical and Chemical Properties
PropertyValue
Chemical FormulaBaB2O4
Crystal Structuretrigonal, 3m
Lattice Parametera=b=12.532Å,c=12.717Å, Z=6
Mass Density3.85 g/cm3
Moh Hardness4
Melting PointAbout 1095°C
Thermal Conductivity1.2 W/m/K (⊥c); 1.6 W/m/K (//c)
Thermal Expansion Coefficientα,4×10-6/K; c,36×10-6/K
Birefringencenegative uniaxial
Linear Optical Properties
PropertyValue
Transparency Range189 – 3500 nm
Absorption Coefficientα<0.1%/cm @1064nm
Refractive Indices
at 1.0642 μmne = 1.5425, no = 1.6551
at 0.5321 μmne = 1.5555, no = 1.6749
at 0.2660 μmne = 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
PropertyValue
SHG Phase Matchable Range409.6 ∼ 3500nm (Type I); 525 ∼ 3500nm (TypeII)
NLO Coefficientsd11= 5.8 x d36(KDP); d31 = 0.05 x d11; d22< 0.05 x d11
deff(I)=d31sinθ+ (d11cos3φ – d22sin3φ)cosθ
deff(II)=(d11sin3φ+ d22cos3θ)cos2θ
Therm-Optic Coefficientsdno/dT = – 9.3 x 10-6/◦C
dne/dT = -16.6 x 10-6/◦C
Electro-Optic Coefficientsg11= 2.7 pm/V, g22, g31< 0.1 g11
Half-Wave Voltage48 KV (at 1064 nm)
Damage Threshold
 at 1.064 μm5 GW/cm2 (10 ns); 10 GW/cm2 (1.3 ns)
 at 0.532 μm1 GW/cm2 (10 ns); 7 GW/cm2 (250 ps)
Spectra
BBO-AR-Coating-reflectionBBO-P-Coating-reflection
BBO AR Coating-ReflectionBBO P Coating-Reflection
BBO-Nolinear-Crystal-TransmissionBBO-Nolinear-Crystal-SHG-tuning-curves-of-BBO
BBO Transmission SpectrumSHG tuning curves of BBO
BBO-Nolinear-Crystal OPO-tuning-curves-of-BBO-(TypeI-(ooe))with-different-pump-light,-namely-530-nm,-355-nm-and-266-nmBBO-Nonlinear-Crystal-OPO-tuning-curves-of-BBO-(TypeII-(eoe))with-different-pump-light,-namely-530-nm,-355-nm-and-266-nm
OPO tuning curves of BBO  (TypeI (ooe))with different pump light, namely 530 nm, 355 nm and 266 nmOPO tuning curves of BBO (TypeII (eoe))with different pump light, namely 530 nm, 355 nm and 266 nm
Case
Feature
Application
Reference
News
Case

BBO crystal for [email protected] nm
Size:4*4*0.1mm;

Clear aperture: >90%;
2-side polishing;
Coating: AR/[email protected] nm& 800 nm

BBO crystal for Pockels cell
Dimension: 3×3×20 mm;

Phase matching : Type I;
S1:[email protected](R<0.2%);
S2:[email protected](R<0.2%);
S3:Cr+Au coating;
S4:Cr+Au coating

BBO crystal case 3
Size: 4*4*20mm, z-cut;
AR/[email protected],R<0.1%;
Electrodes on X faces(with Au/Cr electrodes.);
Damage threshold: >7J/cm2@1064nm, 10ns,10HZ

BBO crystal case 4
Size: 5*5*10 (+/-0.1)mm
Type I, Theta= 65.4°, Phi= 90°
Coating: S1,S2, AR/[email protected] & 225 nm

BBO crystal case 6
Dimensions: 6×6×1 mm, 6×6×5 mm;
Coating S1/S2: protective [email protected]

BBO crystal case 7 for OPA
Size: 6×6×2 mm;
Coating: Protective [email protected]

BBO crystal case 8 for 2nd harmonic generation from Ti:Sapphire laser
Size: 20×20×0.3 mm;
S1&S2: Polished and AR – 800/400nm

BBO crystal case 9 for 1500 nm frequency doubling
Size: 2×2×5 mm;
Type I;
AR/AR coating

BBO crystal case 10 for SHG
① Size: 6×6×6 mm;
     SHG eoe 744 nm → 372 nm;
② Size: 6×6×9 mm;
     SHG eoe 744 nm + 372 nm → 248 nm

Feature
  • The range of transmission is from 190 nm to 3500nm
  • Good physical properties
  • Appropriate mechanical properties
  • Effective SHG(Second-harmonic generation) coefficient is large
  • Damage threshold of 100 ps pulse with 10 J/cm2 at 1064 nm
  • The range of phase matching is large from 409.6 nm to 3500nm
  • Temperature bandwidth is about 55℃
  • Optical homogeneity is high:δn≈10-6/cm
Application
  • Material Processing
    266nm laser
  • Optical Communication
    1600nm laser
  • Radar and Ranging
    1064nm,532nm,355nm laser
  • Medical Applications
    532nm laser
    1064nm/532nm laser
Reference
Collinear and non-collinear sum-frequency mixing in β-BBO for a tunable 195–198 nm all-solid-state laser system
Appl. Phys. B 61,529-532 (1995)
Consideration of angular acceptance angle in BBO crystal on a highly efficient second harmonic generation
Optics & Laser Technology Volume 30, Issues 3–4, April–June 1998, Pages 189-192
Generation of 125 mW frequency stabilized continuous-wave tunable laser light at 295 nm by frequency doubling in a BBO crystal
Optics Communications Volume 213, Issues 4–6, 1 December 2002, Pages 347-350
Characterization of OPCPA with BBO crystal for femtosecond Ti:sapphire laser pulses
CLEO/Pacific Rim 2003. The 5th Pacific Rim Conference on Lasers and Electro-Optics (IEEE Cat. No.03TH8671)

If you can’t find the Literature you want, Contact us to get the PDF      Get the Literature

Theoretical investigation of phase-mismatched second-harmonic conversion efficiency in BBO crystal
Optik Volume 161, May 2018, Pages 196-203
Characterization of nonlinear optical parameters of KDP, LiNbO3 and BBO crystals
Optics Communications Volume 229, Issues 1–6, 2 January 2004, Pages 403-412
Characterization of nonlinear refractive indices of KDP, KTP, LiNBO/sub 3/ and BBO crystals at 1064 nm and 532 nm
CLEO/Pacific Rim 2003. The 5th Pacific Rim Conference on Lasers and Electro-Optics (IEEE Cat. No.03TH8671)
Nonlinear LBO and BBO crystals for extreme light sources
2010 International Conference on Advanced Optoelectronics and Lasers
Sum and difference frequency generation of white light continuum with the ps pulses of Nd+3:YAG laser in a thick BBO crystal
Optics Communications Volume 278, Issue 1, 1 October 2007, Pages 175-179
210 nm ultraviolet generation using blue-violet laser diode and BBO SHG crystal
CLEO/Pacific Rim 2003. The 5th Pacific Rim Conference on Lasers and Electro-Optics (IEEE Cat. No.03TH8671)
Observation of second harmonic generations from x-cut BBO whispering gallery mode resonators
IEEE Photonics Conference 2012
1.3 Waverage power at 255 nm by second harmonic generation in BBO pumped by a copper HyBrID laser
Optics Communications Volume 132, Issues 3–4, 1 December 1996, Pages 302-306
Beta barium borate (BBO)
Appl. Phys. A 52, 359-368 (1991)
Reduction of the spectral width and beam divergence of a BBO-OPO by using collinear type-II phase matching and back reflection of the pump beam
Appl Phys B (2012) 108:283–288 DOI 10.1007/s00340-012-5036-3
Generation of femtosecond tunable radiation from 380 nm to 450 nm via cascaded wave-mixing in a seeded 405-nm pumped type-I BBO noncollinear optical parametric amplifier
CLEO/Pacific Rim 2003. The 5th Pacific Rim Conference on Lasers and Electro-Optics (IEEE Cat. No.03TH8671)
Harmonic and sum-frequency generation of pulsed laser radiation in BBO, LBO, and KDP
Appl.Phys.B86,275–278(2007)
Detection of ∼1 atto-joule signal pulse at 532 nm using a picosecond collinear BBO optical parametric amplifier
Optics Communications Volume 291, 15 March 2013, Pages 329-333
Efficient generation of tunable VUV laser radiation below 205 nm by SFM in BBO
Appl. Phys. B 55, 419-423 (1992)
Femtosecond noncollinear and collinear parametric generation and amplification in BBO crystal
Appl. Phys. B 70, 163–168 (2000) / Digital Object Identifier (DOI) 10.1007/s003409900108
Highly efficient deep ultraviolet generation by sum-frequency mixing in a BBO crystal pair
 Indian Academy of Sciences
Direct evidence of the noninstantaneous response of n/sub 2/ induced by cascading phenomena during SHG of femtosecond pulses in a BBO crystal
Conference on Lasers and Electro-Optics, 2003. CLEO ’03
Efficient broadband 400 nm noncollinear second harmonic generation of chirped femtosecond laser pulses in BBO and LBO
2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC
News

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Reader Interactions

Comments

  1. Wenyu says

    September 15, 2019 at 04:53

    Hi,

    I am a postdoc scholar at Caltech. We are looking for a BBO crystal to generate polarization entangled photon pair. Our pump is a 266nm, 10ps pulsed laser (repetition rate is 10 kHz). We would prefer type-II non-colinear configuration as entanglement can be generated directly from the crystal without the need for post-selection. Will you be able to produce such crystal?Thank you very much!

    Best regards,

    Wenyu

    Reply
    • Laser-CryLink says

      September 16, 2019 at 09:02

      Hi,Wenyu,Our sales wiill contact you soon.

      Reply

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