LBO Crystal

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

The presentation of  LBO Crystal

Lithium Triborate LiB305or LBO is a newly developed nonlinear optical crystal.It is unique in many aspects,especially its wide transprency range,moderately high nonlinear coupling,high damage threshold and good chemical and mechanical properties.Its transmission range is from 0.21>mto 2.3 >m.Type I SHG ,and also provides room temperature NCPM fro Type II SHG at 0.8-1.1>m.iIt possesses a relatively large angular acceptance bandwidth,reducing the beam quality requirements for source lasers.

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).


1 Wide acceptance angle and small walk-off. 2 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.

CryLightoffers:

8 Strict quality control. 9 Large crystal with size up to 10x10x30 mm3 and maximum length of 35 mm.

u AR-coatings, mounts and repolishing services. 10 Strong technical support.

11 Mass production line to support OEM applications. 12 Unbeatable prices and special OEM discount.

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

14 Precision oven and temperature controller for NCPM SHG.

Basic Properties of LBO Crystal

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   (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 Coefficient

deff(I)=d32cosφ      (Type I  in XY plane)
deff(I)=d31cos2θ+d32sin2θ   (Type I  in 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

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

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.

 

CryLight'S Warranty on LBO Specifications

Transmitting wavefront distortion

less than l/8 @ 633nm

Dimension tolerance

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

Clear aperture

central 80% diameter

No visible scattering paths or centers when inspected by a 30 mW green laser

Flatness

l/8 @ 633nm

Surface Quality

10/5 Scratch/Dig to MIL-O-13830A

Parallelism

better than 20 arc seconds

Perpendicularity

15 arc minutes

Angle tolerance

Dq < ±0.5o, Df <± 0.5o

Damage threshokd:
15 GW/cm2 for a TEMoo mode, 1.3 ns, 1 Hz laser at 1.064 mm
1 GW/cm2 for a cw, mode-locked laser at 1064nm

Quality warranty period

one year under proper use

 

NOTE

1.

LBO has a very low susceptibility to moisture. Users are advised to provide dry conditions for both use and preservation of LBO.

2.

Users are advised to cautiously protect polished surfaces of LBO.

3.

CryLightengineers 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.

CryLightprovides mounts and sealed housing for LBO crystals.