LBO

 

Features
Skight Optics supplies Lithium Triborate LiB3O5 or LBO, which is a newly developed nonlinear optical crystal. It is unique in many aspects, especially its wide transparency range, moderately high nonlinear coupling, high damage threshold and good chemical and mechanical properties. Its transmission range is from 0.21μm, to 2.3 μm,. LBO allows temperature-controllable non -critical phase-matching (NCPM) for 1.0-1.3 μm, Type I SHG, and also provides room temperature NCPM for Type II SHG at 0.8-1.1 μm. It possesses a relatively large angular acceptance bandwidth, reducing the beam quality requirements for source lasers. 

Capabilities
1.Aperture: 1x1 ~ 25x25mm
2.Length: 0.02 ~ 60mm
3.Phase matching angle θ and φ: Determined by different kinds of harmonic generation.
4.Phase matching type: Type I or Type II
5.End configuration: Flat or Brewster or Specified 

 
Specifications 
Dimension Tolerance-----------------------------------------(W±0.1mm)x(H±0.1mm)x(L+0.5/-0.1mm) 

Angle Tolerance-----------------------------------------------△θ< 0.25°,△Φ < 0.25° 
Clear Aperture------------------------------------------------central 95% of the diameter
Surface Flatness ---------------------------------------------<λ/8 at 633nm
Wavefront Distortion----------------------------------------<λ/8 @ 633nm
Chamfer-------------------------------------------------------0.1mm@45° 
Surface Quality (S/D)----------------------------------------10 /5 
Parallelism-----------------------------------------------------< 20 arc seconds
Perpendicularity----------------------------------------------< 5 arc minutes
Coatings: Protective (P) and Anti-reflection (AR) coating available upon customer’s requests
Damage threshold ------------------------------------------>18.9 GW/cm2 for a 1.3ns laser at 1053nm 
                             ------------------------------------------->25 GW/cm2 for a 10 ns laser at 1064 nm



Chemical and Structural Properties 

Crystal Structure Orthorhombic, Space group Pna21, Point group mm2 Lattice Parameter a=8.4473Ä, b=7.3788Ä , c=5.1395Ä , Z=2 Melting Point    About 834℃ Mohs Hardness    6 Density          2.47 g/cm3 Thermal Conductivity   3.5W/m/K Thermal Expansion Coefficient ax=10.8x10-5/K, ay= -8.8x10-5/K, az=3.4x10-5/K

Optical and Nonlinear Optical Properties 

Transparency Range 160-2600nm SHG Phase Matchable Range 551 ~ 2600nm  (Type I)      790-2150nm (Type II) Therm-optic Coefficient  (°C, λ in μm) dnx/dT=-9.3X10-6 dny/dT=-13.6X10-6 dnz/dT=(-6.3-2.1λ)X10-6 Absorption  Coefficient <0.1%/cm at 1064nm    <0.3%/cm at 532nm Angle Acceptance 6.54mrad-cm    (φ, Type I,1064 SHG) 15.27mrad-cm    (q, Type II,1064 SHG) TemperatureAcceptance 4.7°C-cm   (Type I, 1064 SHG) 7.5°C-cm   (Type II,1064 SHG) Spectral Acceptance 1.0nm-cm (Type I, 1064 SHG) 1.3nm-cm (Type II,1064 SHG) Walk-off Angle 0.60° (Type I  1064 SHG) 0.12° (Type II  1064 SHG) NLO Coefficients deff(I)=d32cosΦ     (Type I  in XY plane) deff(I)=d31cos2θ+d32sin2θ   (Type I  in XZ plane) deff(II)=d31cosθ  (Type II in YZ plane) deff(II)=d31cos2θ+d32sin2θ   (Type II in XZ plane) Non-vanished NLO susceptibilities d31=1.05 ± 0.09 pm/V d32= -0.98 ± 0.09 pm/V d33=0.05 ± 0.006 pm/V Sellmeier  Equations(λ in μm)      nx2=2.454140+0.011249/(λ2-0.011350)-0.014591λ2-6.60x10-5λ4 ny2=2.539070+0.012711/(λ2-0.012523)-0.018540λ2+2.0x10-4λ4 nz2=2.586179+0.013099/(λ2-0.011893)-0.017968λ2-2.26x10-4λ4