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LBO Crystal
Optical Crystals

LBO Crystal

Supplier
Dientech
Category
Optical Crystals
Origin
China

LBO (Lithium Triborate - LiB3O5) is now the most popularly used material for Second Harmonic Generation (SHG) of 1064nm high power lasers (as a substitute to KTP) and Sum Frequency Generation (SFG) of 1064nm laser source to achieve UV light at 355nm. LBO is phase matchable for the SHG and THG of Nd:YAG and Nd:YLF lasers, using either type I or type II interaction. For the SHG at room temperature, type I phase matching can be reached and has the maximum effective SHG coefficient in the principal XY and XZ planes in a wide wavelength range from 551nm to about 2600nm. SHG conversion efficiencies of more than 70% for pulse and 30% for cw Nd:YAG lasers, and THG conversion efficiency over 60% for pulse Nd:YAG laser have been observed. LBO is an excellent NLO crystal for OPOs and OPAs with a widely tunable wavelength range and high powers. These OPO and OPA which are pumped by the SHG and THG of Nd:YAG laser and XeCl excimer laser at 308nm have been reported. The unique properties of type I and type II phase matching as well as the NCPM leave a large room in the research and applications of LBO's OPO and OPA. 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: 2.47g/cm3 Thermal Expansion Coeficients: αx=10.8x10-5/K, αy=-8.8x10-5/K,αz=3.4x10-5/K αx=10.8x10-5/K, αy=-8.8x10-5/K,αz=3.4x10-5/K: 3.5W/m/K

Specification Snapshot
Damage threshold [1064nm；TEM00；10ns；10HZ；polished only]
>10 GW/cm2
Damage threshold [1064nm；TEM00；10ns；10HZ；AR-coated]
>1 GW/cm2
Damage threshold [532nm；TEM00；10ns；10HZ；AR-coated]
>0.5 GW/cm2
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Overview

LBO (Lithium Triborate - LiB3O5) is now the most popularly used material for Second Harmonic Generation (SHG) of 1064nm high power lasers (as a substitute to KTP) and Sum Frequency Generation (SFG) of 1064nm laser source to achieve UV light at 355nm. LBO is phase matchable for the SHG and THG of Nd:YAG and Nd:YLF lasers, using either type I or type II interaction. For the SHG at room temperature, type I phase matching can be reached and has the maximum effective SHG coefficient in the principal XY and XZ planes in a wide wavelength range from 551nm to about 2600nm. SHG conversion efficiencies of more than 70% for pulse and 30% for cw Nd:YAG lasers, and THG conversion efficiency over 60% for pulse Nd:YAG laser have been observed. LBO is an excellent NLO crystal for OPOs and OPAs with a widely tunable wavelength range and high powers. These OPO and OPA which are pumped by the SHG and THG of Nd:YAG laser and XeCl excimer laser at 308nm have been reported. The unique properties of type I and type II phase matching as well as the NCPM leave a large room in the research and applications of LBO's OPO and OPA. 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: 2.47g/cm3 Thermal Expansion Coeficients: αx=10.8x10-5/K, αy=-8.8x10-5/K,αz=3.4x10-5/K αx=10.8x10-5/K, αy=-8.8x10-5/K,αz=3.4x10-5/K: 3.5W/m/K

Specifications

ParameterValue
Crystal StructureOrthorhombic, Space group Pna21, Point group mm2
Lattice Parametera=8.4473Å,b=7.3788Å,c=5.1395Å,Z=2
Melting PointAbout 834℃
Mohs Hardness6
Density2.47g/cm3
Thermal Expansion Coeficientsαx=10.8×10-5/K, αy=-8.8×10-5/K,αz=3.4×10-5/K
Thermal Conductivity Coefficients3.5W/m/K
Transparency Range160-2600nm
SHG Phase Matchable Range [Type I]551-2600nm
SHG Phase Matchable Range [Type II]790-2150nm
Therm-optic Coefficient [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 Acceptance6.54mrad·cm (φ, Type I,1064 SHG) 15.27mrad·cm (θ, Type II,1064 SHG)
Temperature Acceptance4.7℃·cm (Type I, 1064 SHG) 7.5℃·cm (Type II, 1064 SHG)
Spectral Acceptance1.0nm·cm (Type I, 1064 SHG) 1.3nm·cm (Type II, 1064 SHG)
Walk-off Angle0.60° (Type I 1064 SHG) 0.12° (Type II 1064 SHG)
Dimension tolerance(W±0.1mm)x(H±0.1mm)x(L+0.5/-0.1mm) (L≥2.5mm)(W±0.1mm)x(H±0.1mm)x(L+0.1/-0.1mm) (L<2.5mm)
Clear aperturecentral 90% of the diameter; No visible scattering paths or centers when inspected by a 50mW green laser
Flatness [633nm]less than λ/8 @ 633nm
Transmitting wavefront distortion [633nm]less than λ/8 @ 633nm
Chamfer [45°]≤0.2mm x 45°
Chip≤0.1mm
Scratch/Dig [MIL-PRF-13830B]better than 10/ 5 to MIL-PRF-13830B
Parallelismbetter than 20 arc seconds
Perpendicularity≤5 arc minutes
Angle tolerance△θ≤0.25°, △φ≤0.25°
Damage threshold [1064nm；TEM00；10ns；10HZ；polished only]>10 GW/cm2
Damage threshold [1064nm；TEM00；10ns；10HZ；AR-coated]>1 GW/cm2
Damage threshold [532nm；TEM00；10ns；10HZ；AR-coated]>0.5 GW/cm2

Applications

More than 480mW output at 395nm is generated by frequency doubling a 2W mode-locked Ti:Sapphire laser (<2ps, 82MHz). The wavelength range of 700-900nm is covered by a 5x3x8mm3 LBO crystal. Over 80W green output is obtained by SHG of a Q-switched Nd:YAG laser in a type II 18mm long LBO crystal. The frequency doubling of a diode pumped Nd:YLF laser (>500μJ @ 1047nm,<7ns, 0-10KHz) reaches over 40% conversion efficiency in a 9mm long LBO crystal. The VUV output at 187.7 nm is obtained by sum-frequency generation. 2mJ/pulse diffraction-limited beam at 355nm is obtained by intracavity frequency tripling a Q-switched Nd:YAG laser. A quite high overall conversion efficiency and 540-1030nm tunable wavelength range were obtained with OPO pumped at 355nm. Type I OPA pumped at 355nm with the pump-to-signal energy conversion efficiency of 30% has been reported. Type II NCPM OPO pumped by a XeCl excimer laser at 308nm has achieved 16.5% conversion efficiency, and moderate tunable wavelength ranges can be obtained with different pumping sources and temperature tuning. By using the NCPM technique, type I OPA pumped by the SHG of a Nd:YAG laser at 532nm was also observed to cover a wide tunable range from 750nm to 1800nm by temperature tuning from 106.5℃ to 148.5℃. By using type II NCPM LBO as an optical parametric generator (OPG) and type I critical phase-matched BBO as an OPA, a narrow linewidth (0.15nm) and high pump-to-signal energy conversion efficiency (32.7%) were obtained when it is pumped by a 4.8mJ, 30ps laser at 354.7nm. Wavelength tuning range from 482.6nm to 415.9nm was covered either by increasing the temperature of LBO or by rotating BBO.

Key Features

Broad transparency range from 160nm to 2600nm High optical homogeneity (δn≈10-6/cm) and being free of inclusion Relatively large effective SHG coefficient (about three times that of KDP) High damage threshold Wide acceptance angle and small walk-off Type I and type II non-critical phase matching (NCPM) in a wide wavelength range Spectral NCPM near 1300nm.

Datasheet

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Supplier Information

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Dientech
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Chengdu Dien Photoelectric Technology Co., Ltd. is an energetic young crystalline materials technology company, specializing in the research, design, manufacture and sales of a series of nonlinear optical crystals, laser crystals, magneto-optic crystals and substrates. With excellent quality and competitiveness, the products are widely used in scientific research, beauty and industrial markets. The company has an experienced sales and engineering team dedicated to providing customized application solutions for customers in the global beauty, industrial and scientific research fields. The products meet European and world standards. Headquartered in Chengdu, China, DIEN TECH has customers all over the world, including the USA, Europe and Asia. DIEN TECH is committed to becoming one of the most reliable and high-quality photoelectric component suppliers in the world.

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