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Lithium Triborate LiB305 or LBO is a newly developed nolinear optical crystal.It is unique in many aspects,especially its wide transparency range,mechanical properties.Its transmission range is from 0.21?/im to 2.3 ?/im.LBO Crystal allows temperature-controllable non-critical phase-matching(NCPM) for 1.0-1.3?/im.Type I SHG ,and also provides room temperature NCPM for typeII SHG at 0.8-1.1?/im.It possesses a relativey(dn?0-6/cm) and being free of inclusion Relatively largequality requirements for sours lasers.Features:Broad transparency range from 160nm to 2600nm High optical homogeneity(dn?0-6/cm) and being freeof inclusion Relatively large effective SHG coeffcient(about three times that of KDP) High damage threshold(18.9GW/cm2 for a 1.3ns laser at 1053nm)Wide acceptance angle and small walk-off Type I and Type II non-critical phase matching(NCPM) in a wide wavelength range Spectral.

The presentation of LBO Crystal
Lithium Triborate LiB305or LBO is a newly developed nonlinear optical crystal.It is unique in many aspects,especially its wide transprency range,moderately high nonlinear coupling,high damage threshold and good chemical and mechanical properties.Its transmission range is from 0.21>mto 2.3 >m.Type I SHG ,and also provides room temperature NCPM fro Type II SHG at 0.8-1.1>m.iIt possesses a relatively large angular acceptance bandwidth,reducing the beam quality requirements for source lasers.

LBO Crystal Features :
1 Broad transparency range from 160nm to 2600nm (SHG range from 550nm to 2600nm).
2 Type I and type II non-critical phase-matching (NCPM) over a wide wavelength range.
3 Relatively large effective SHG coefficient (about three times larger than that of KDP)
4 High damage threshold (18.9 GW/cmfor a 1.3ns laser at 1054nm).

1 Wide acceptance angle and small walk-off.
2 High optical quality (homogeneity Dn≈ 10-6/cm) and free of inclusion.

LBO Crystal Applications:
1 High power Nd:YAG and Nd:YLF lasers for R&D and military applications.
2 Ti:Sapphire, Alexandrite and Cr:LiSAF lasers.
3 Medical and industrial Nd:YAG lasers.
4 Diode laser pumped Nd:YVO4, Nd:YAG and Nd:YLF lasers.
5 Frequency-tripling (THG) of Nd:YAG and Nd:YLF lasers.
6 Optical parametric amplifiers (OPA) and oscillators (OPO) pumped by Excimer lasers and harmonics of Nd:YAG lasers.
7 Frequency doubling (SHG) and tripling (THG) of high power Nd:YAP laser at 1340nm.

8 Strict quality control.
9 Large crystal with size up to 10x10x30 mm3 and maximum length of 35 mm.
u AR-coatings, mounts and repolishing services.
10 Strong technical support.
11 Mass production line to support OEM applications.
12 Unbeatable prices and special OEM discount.
13 Fast delivery, in-stock crystals in a large quantity.
14 Precision oven and temperature controller for NCPM SHG.

Table 1. Chemical and Structural properties
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 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

Transparency Range 160-2600nm
SHG Phase Matchable Range 551 ~ 2600nm(Type I)790-2150nm (Type II)
Therm-optic Coefficient(°C, l in μm) dnx/dT=-9.3X10-6
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)
Temperature Acceptance 4.7°C-cm(Type I, 1064 SHG)
7.5°C-cm nbsp; (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 I1064 SHG)
0.12° (Type II1064 SHG)
NLO Coefficient deff(I)=d32cosφ(Type Iin XY plane)
deff(I)=d31cos2θ+d32sin2θ(Type Iin 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
SellmeierEquations(λ in μm) nx2=2.454140+0.011249/(λ2-0.011350)-0.014591λ2-6.60x10-5λ4

Table 2. Optical and Nonlinear Optical Properties
   CryLightprovides the following AR-coatings:
1. Dual-band AR-coating of LBO for SHG of Nd:YAG lasers.
◇Low reflectance
◇( < 0.1% at 1064nm and < 0.25% at 532nm);
◇High damage threshold
◇( > 500 MW/cm2 at both wavelengths);
◇Long durability.
2. Broad Band AR-coating for frequency doubling Ti:Sapphire laser.
3. Other coatings are available upon request.

CryLight'S Warranty on LBO Specifications
Transmitting wavefront distortion less thanl/8 @ 633nm
Dimension tolerance (W± 0.1 mm) x (H± 0.1 mm) x (L + 0.2 mm/-0.1 mm)
Clear aperture central 80% diameter
No visible scattering paths or centers when inspected by a 30 mW green laser
Flatness l/8 @ 633nm
Surface Quality 10/5 Scratch/Dig to MIL-O-13830A
Parallelism better than 20 arc seconds
Perpendicularity 15 arc minutes
Angle tolerance Dq < ±0.5o,Df <± 0.5o
Damage threshokd:
15 GW/cm2 for a TEMoo mode, 1.3 ns, 1 Hz laser at 1.064mm
1 GW/cm2 for a cw, mode-locked laser at 1064nm
Quality warranty period one year under proper use

1. LBO has a very low susceptibility to moisture. Users are advised to provide dry conditions for both use and preservation of LBO.
2. Users are advised to cautiously protect polished surfaces of LBO.
3. CryLightengineers can select and design the best crystal for you if parameters of your laser are provided, for example, energy per pulse, pulse width and repetition rate for a pulsed laser, power for a cw laser, laser beam diameter, mode condition, divergence, wavelength tuning range, etc.
4. CryLightprovides mounts and sealed housing for LBO crystals.