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Nonlinear Crystal LBO Crystals

Nonlinear Crystal Lithium Tri-borate or LBO crystals (LiB3O5) is one of the most useful nonlinear optical materials not just for its relatively large conversion coefficient - 3x that of KDP, but also for its excellent physical properties.

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Description

LBO Crystals
Lithium Tri-borate or LBO crystals (LiB3O5) 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.
Feature
◇ Broad transparency range from 160nm to 2600nm (see Figure 1);
◇ High optical homogeneity (dn»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.

Table 1. Chemical and Structural properties of LBO

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

Table 2. Optical and Nonlinear Optical Properties of LBO

Transparency Range	160-2600nm
SHG Phase Matchable Range	551 ~ 2600nm (Type I) 790-2150nm (Type II)
Therm-optic Coefficient (°C, λ in μm)	dnx/dT=-9.3X10^-6 dny/dT=-13.6X10^-6 dnz/dT=(-6.3-2.1λ)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 (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	d_eff(I)=d₃₂cosΦ (Type I in XY plane) d_eff(I)=d₃₁cos²θ+d₃₂sin²θ (Type I in XZ plane) d_eff(II)=d₃₁cosθ (Type II in YZ plane) d_eff(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)	n_x²=2.454140+0.011249/(λ²-0.011350)-0.014591λ²-6.60x10^-5λ⁴ n_y²=2.539070+0.012711/(λ²-0.012523)-0.018540λ²+2.0x10^-4λ⁴ n_z²=2.586179+0.013099/(λ²-0.011893)-0.017968λ²-2.26x10^-4λ⁴

Standard Size of LBO crystal

20205-001	2x2mm	10mm	90°	11.4°	AR/AR@1064+532nm	SHG@1064nm, Type1	$75	4 weeks
20205-002	3x3mm	10mm	90°	11.4°	AR/AR@1064+532nm	SHG@1064nm, Type1	$150	4 weeks
20205-003	3x3mm	15mm	90°	11.4°	AR/AR@1064+532nm	SHG@1064nm, Type1	$200	4 weeks
20205-004	4x4mm	10mm	90°	11.4°	AR/AR@1064+532nm	SHG@1064nm, Type1	$305	4 weeks
20205-005	4x4mm	15mm	90°	11.4°	AR/AR@1064+532nm	SHG@1064nm, Type1	$380	4 weeks
20205-006	4x4mm	20mm	90°	11.4°	AR/AR@1064+532nm	SHG@1064nm, Type1	$455	4 weeks
20205-007	5x5mm	10mm	90°	11.4°	AR/AR@1064+532nm	SHG@1064nm, Type1	$380	4 weeks
20205-008	5x5mm	15mm	90°	11.4°	AR/AR@1064+532nm	SHG@1064nm, Type1	$470	4 weeks
20205-009	5x5mm	20mm	90°	11.4°	AR/AR@1064+532nm	SHG@1064nm, Type1	$575	4 weeks
20205-010	3x3mm	10mm	90°	0°	AR/AR@1064+532nm	NCPM SHG@1064 T=149℃	$150	4 weeks
20205-011	3x3mm	15mm	90°	0°	AR/AR@1064+532nm	NCPM SHG@1064 T=149℃	$215	4 weeks
20205-012	4x4mm	10mm	90°	0°	AR/AR@1064+532nm	NCPM SHG@1064 T=149℃	$305	4 weeks
20205-013	4x4mm	15mm	90°	0°	AR/AR@1064+532nm	NCPM SHG@1064 T=149℃	$380	4 weeks
20205-014	4x4mm	20mm	90°	0°	AR/AR@1064+532nm	NCPM SHG@1064 T=149℃	$455	4 weeks
20205-015	5x5mm	10mm	90°	0°	AR/AR@1064+532nm	NCPM SHG@1064 T=149℃	$365	4 weeks
20205-016	5x5mm	15mm	90°	0°	AR/AR@1064+532nm	NCPM SHG@1064 T=149℃	$485	4 weeks
20205-017	5x5mm	20mm	90°	0°	AR/AR@1064+532nm	NCPM SHG@1064 T=149℃	$605	4 weeks