LBO CRYSTAL

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LBO Crystal

Lithium Triborate LiB305 or LBO is a newly developed nonlinear optical crystal. It is unique in many aspects, especially its wide transparency range, mechanical properties. Its transmission range is from 0.21>m to 2.3 >m. LBO Crystal allows temperature-controllable non-critical phase-matching(NCPM) for 1.0-1.3/m.Type I SHG and also provides room temperature NCPM for typeII SHG at 0.8-1.1/m. It possesses a relative(dn?0-6/cm) and being free of inclusion Relatively large quality requirements for sours lasers. Features: Broad transparency range from 160nm to 2600nm High optical homogeneity(dn?0-6/cm) and being free of inclusion Relatively large effective SHG coefficient(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.

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LBO CRYSTAL Manufacturing Capabilities

Angle tolerance:	Δθ< ± 0.5±; Δφ< ±0.5±
Dimensional Tolerance:	(W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2/-0.1mm)
Flatness:	<L/8 at 633nm
Surface Quality(S/D):	10/5 before coating, 20/10 after coated
Parallelism:	< 20 arc seconds
Perpendicularity:	< 5 arc minutes
Wavefront Distortion:	<L/8 at 632.8nm
Clear Aperture:	Central 95%
Bevel (leg width):	<0.15mm x 45degree
Coating:	* Protective coating is required to prevent polished surfaces from fogging.
	* Anti-reflective coating should be considered if low reflectivity is required.
Mount:	Black Anodized Aluminium

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/cm2 for a 1.3ns laser at 1054nm).

5 Wide acceptance angle and small walk-off.

6 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.

CRYLIGHT offers

1 Strict quality control.

2 Large crystal with size up to 10x10x30 mm3 and a maximum length of 35 mm. u AR-coatings, mounts, and repolishing services.

3 Strong technical support.

4 Mass production line to support OEM applications.

5 Unbeatable prices and special OEM discounts.

6 Fast delivery, in-stock crystals in a large quantity.

7 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 dny/dT=-13.6X10-6 dnz/dT=(-6.3-2.1l)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)
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 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

Table 2. Optical and Nonlinear Optical Properties

AR-Coatings 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.
1. LBO has a very low susceptibility to moisture. Users are advised to provide dry conditions for both the use and preservation of LBO.
2. Users are advised to cautiously protect the polished surfaces of LBO.
3. CRYLIGHT's engineers 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. CRYLIGHT's provides mounts and sealed housing for LBO crystals.

CRYLIGHT'S production lines of crystal

Grinding Polishing

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Polishing

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Coating Spectrophotometer

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Inspection

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In 2005, CRYLIGHT began to professionally produce high-precision optics and optical imaging lenses.

LBO CRYSTAL

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