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LBO Crystal

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LBO crystal

Product Description

LBO crystal is an excellent frequency doubling crystal and is currently a widely used frequency doubling device. Its internal optical uniformity of the crystal is good, the transmission band is relatively wide, and it has high matching efficiency and laser damage threshold.

Application: laser frequency doubling, etc.

LBO crystal properties:

Wavelenght Range	160~2600nm
Density	2.47g/cm²
Deliquescent	slight
Moh'S Hardness	4
Thermal Conductivity	α_x=10.8 X10^-6/K a_y=8.8X10^-6/K a_z=3.4x10^-6/K
Thermal Conductivity	α_x=10.8 X10^-6/K a_y=8.8X10^-6/K a_z=3.4x10^-6/K
Nonlinear Optical Coefficients	d₃₁=1.05±0.09pm/V d₃₂=-0.98±0.09pm/V d₃₃=0.05±0.006pm/V
Absorption Coefficient	<0.1%/cm@1064nm
Sellmeier Equation (λ in μm)	n_x²=2.454140+0.011249/( λ²-0.011350)-0.014591 λ²-6.60x10^-5 λ⁴ n_y²=2.539070+0.012711/( λ²-0.012523)-0.018540 λ²=2.0x10^-4 λ⁴ n_z²=2.586179+0.013099/( λ²-0.011893)-0.017968 λ²=2.26x10^-4 λ⁴

Product Processing Parameters:

Material	LBO
Processing Thickness	0.01mm-20mm
Surface Quality	10-5
Optical Axis Accuracy	3'
Parallelism	<10''
Surface Accuracy	λ/10@633nm
Clear Aperture	>95%
Coating	Can be coated according to customer needs
Mount	According to customer requirements

Lithium Tri-borate (LBO) is one of the most useful nonlinear optical material not just for its relatively large conversion coefficient - 3x that of KDP, but also for its excellent physical properties.
LBO crystal has broad optical transparency range from 160 to 2600nm. It excels in high power SHG with minimal thermal lensing as compared to KTP. Its large acceptance angle paired with small walk-off angle which reduces the beam quality requirement for source lasers. LBO also allows temperature controllable type I non-critical phase-matching(NCPM) for 1000 – 1300nm and type II NCPM for 800 to 1100nm at room temperature. With a high optical homogeneity (?n ~10-6), the material is grown virtually inclusion free. With a damage threshold of up to 45 GW/cm2 at 1064nm, it is again the material of choice for high power applications.

LBO is widely used for SHG and THG of Nd:YAG, Nd:YLF, Nd:YVO4 and ultra-fast Ti:sapphire lasers. OPOs(Optical Parametric Oscillators) and OPAs(Optical Parametric Amplifier).

Chemical Formula	LiB₃O₅
Crystal Structure	Orthorhombic, mm2
Cell Parameters	a = 8.4473, b = 7.3788Å, c = 5.1395Å, Z = 2
Melting point	834°C
Optical homogeneity	d n ~ 10^-6/cm
Mohs hardness	6
Density	2.47 g/cm³
Absorption coefficient	< 0.1%/cm (at 1064nm and 532nm)
Specific heat	1.91J/cm³xK
Hygroscopic susceptibility	low
Thermal expansion coefficients	a, 4 x 10^-6/K; c, 36 x 10^-6/K
Thermal conductivity	^ c, 1.2 W/m/K; //c, 1.6 W/m/K

Linear Optical Properties:

Transparency range	160-2600nm
Refractive indices: @1064nm @532nm @355nm	n_x = 1.5656, n_y = 1.5905, n_z = 1.6055 n_e = 1.5785, n_o = 1.6065, n_z = 1.6212 n_e = 1.5971, n_o = 1.6275, n_z = 1.6430
Therm-optic coefficients	dn_o/dT = -9.3 x 10^-6/°C dn_e/dT = -16.6 x 10^-6/°C
Sellmeier Equations (l in mm)
n_o² (l) = 2.7359 - 0.01354l²+ 0.01878/(l²-0.01822) ne²(l) = 2.3753 - 0.01516l²+ 0.01224/(l²-0.01667)

Nonlinear Optical Properties:

Phase-matchable output wavelength	554 - 2660nm (type I), 790 – 2150nm (type II)
NLO coefficients	d₃₃ = 0.06; d₃₂ = 1.2; d₂₂ = 1.1
Walk-off Angles(@ 1064nm)	0.4° (Type I SHG), 0.3° (Type II SHG)
Acceptance Angles(@1064nm) for SHG Type I	9.6(mrad-cm) CPM at 25°C 248(mrad-cm) NCPM at 150°C
Electro-optic coefficients	g₁₁ = 2.7 pm/V, g₂₂, g₃₁ < 0.1g₁₁
Conversion Efficiency	>90% (1064 -> 532nm) Type I SHG
Damage threshold @1064nm @532nm @355nm	45 GW/cm² (1 ns); 10 GW/cm² (1.3 ns) 26 GW/cm² (1 ns); 7 GW/cm² (250 ps) 22 GW/cm²