cur5
LBO


LBO (LiB3O5 or Lithium Triborate) is a nonlinear optical crystal. For frequency doubling (SHG)/tripling (THG) of Nd:YAG, Nd:YLF, Nd:YVO4 lasers, LBO crystal is one of the most useful nonlinear optical material in ultraviolet and visible laser applications.


Advantages

 broad transparency range from 160nm to 2600nm

● high optical homogeneity ( δn≈10-6) 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



Standard LBO

Dimension(mm)

θ(Deg)

φ(Deg)

Coating

Application

3*3*10

42.2

90

AR/AR@1064&532/355nm

THG@1064,TypeⅡ

3*3*10

90

11.6

AR/AR@1064&532nm

SHG@1064,TypeⅠ

3*3*15

42.2

90

AR/AR@1064&532nm

THG@1064,TypeⅡ

5*5*15

42.2

90

AR/AR@1064&532/355nm

THG@1064,TypeⅡ

5*5*15

90

11.6

AR/AR@1064&532nm

SHG@1064, TypeⅠ


Specification

Apertures

up to 30 x30mm

Length

up to 50mm

Dimension Tolerance

(W ±0.1mm) x (H ±0.1mm) x (L +0.2mm/-0.1mm)

Flatness

λ/8 @ 633nm

Scratch/Dig

10-5@MIL-0-13830A

Parallelism

<20 arc seconds

Perpendicularity

<5 arc minutes

Clear Aperture

≥95% central area

Properties

Crystal Structure 

Orthorhombic, Space group Pna21, Point group mm2

Lattice Parameters

a=8.4473 Å, b=7.3788 Å, c=5.1395 Å, Z=2

Melting Point

About 834°C

Mohs Hardness

6

Density

2.47g/cm3

Thermal Conductivity

3.5 W/m/K

Thermal Expansion Coefficient

αx=10.8x10-5/K, αy= -8.8x10-5/K, αz=3.4x10-5/K

TransparencyRange

160 - 2600 nm

SHG Phase Matching Range

551-2600nm for Type I, 790-2150nm for Type II

Thermo-Optic Coefficients

dnx/dT = - 9.3 x 10-6℃-1, λ in μm

dny/dT = -13.6 x 10-6℃-1, λ in μm

dnz/dT = (-6.3+2.1λ) x 10-6℃-1, λ in μm

Sellmeier Equations (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

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