Complaint
LBO a broad transparency range, wide acceptance angle, small walk-off angle, and the highest damage threshold among common nonlinear crystals.
Most common applications include high-power near-infrared wavelength second harmonic generation, sum-frequency generation to produce visible, ultraviolet laser light, and visible, near-infrared widely tuned optical parametric oscillators. OPTU are capable of providing uncoated super-polished LBO crystals desired, e.g. for high-power UV generation via sum-frequency generation of 1064 nm and 532 nm.
Main applications:
1) SHG, THG
2) OPA and OPO
Advantages:
1) Broad transparency range from 160nm to 2600nm;
2) High optical homogeneity (δn≈10-6/cm) and free of inclusion;
3) Large effective SHG coefficient;
4) Wide acceptance angle and small walk-off;
5) Type I and type II non-critical phase matching (NCPM) in a wide wavelength range;
6) High damage threshold(18.9 GW/cm 2 for a 1.3ns laser at 1053nm)
7) Spectral NCPM near 1300nm
Optical and Nonlinear properties of LBO crystal
| Transparency Range | 160-2600nm |
| SHG Phase Matchable Range | 551-2600nm (Type I) 790-2150nm (Type II) |
| Therm-optic Coefficient (/ºC, λ in μm) | dnx/dT=-9.3x10-6 dny/dT=-13.6x10-6 dnz/dT=(-6.3-2.1λ)x10-6 |
| Absorption Coefficients | <0.1%/cm at 1064nm <0.3%/cm at 532nm |
| Angle Acceptance | 6.54mrad·cm (φ, Type I,1064 SHG) 15.27mrad·cm (θ, Type II,1064 SHG) |
| Temperature Acceptance | 4.7ºC·cm (Type I, 1064 SHG) 7.5ºC·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)-0.014591λ2-6.60×10-5λ4 ny2=2.539070+0.012711/(λ2-0.012523)-0.018540λ2+2.00×10-4λ4 nz2=2.586179+0.013099/(λ2-0.011893)-0.017968λ2-2.26×10-4λ4 |
| Crystal Structure | Orthorhombic, Space group Pna21, Point group mm2 |
| Lattice Parameter | a=8.4473Å,b=7.3788Å,c=5.1395Å,Z=2 |
| Melting Point | About 834ºC |
| Mohs Hardness | 6 |
| Density | 2.47g/cm3 |
| Refractive indices | nX= 1,5656; nY= 1,5905; nZ= 1,6055 @1064 nm |
| Thermal Conductivity | 3.5W/m/K |
| Thermal Expansion Coefficients | αx=10.8x10-5/K, αy=-8.8x10-5/K,αz=3.4x10-5/K |
| Tolerance of cutting angle | △θ≤±0.25°,△φ≤±0.25° |
| Tolerance of dimension | Dimension+0/-0.1 mm,L:±0.1mm |
| Flatness | λ/10 @ 632.8nm |
| Wavefront distortion | λ/8@ 632.8nm |
| Surface quality | 10/5 per MIL-O-13830A |
| Parallelism | 20″ |
| Perpendicularity | 5′ |
| Clear Aperture: | > 90% |
| Chamfer: | < 0.1 mm @ 45° |
| Size | Upon customer request |
| Coating | AR/PR coating upon customer's request |
| Damage Threshold | 750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz |
| Quality Warranty Period | One year under proper use |
