LBO Nonlinear Crystals

Lithium triborate (LiB3O5) LBO is an excellent non-linear optics crystal, which has a wide transparency range, high damage threshold, moderately high nonlinear coupling and desirable chemical and mechanical properties.

Product Details


Description

Lithium triborate (LiB3O5) LBO is an excellent non-linear optics crystal, which has a wide transparency range, high damage threshold, moderately high nonlinear coupling and desirable chemical and mechanical properties. LBO crystals have been widely used in second harmonic generation (SHG), for example of Nd:YAG lasers (1064 nm ~ 532 nm). LBO can be both critically and non-critically phase-matched.

Thanks to its large spectral transmission range as well as noncritical phase matching (NCPM) in the near IR region, LBO crystals have been applied in non-linear optical applications like OPO, OPA,OPCPA and other. Since its broad gain bandwidth overlaps with Ti:Sapphire in 800 nm range, ultra-high power and high contrast laser systems have been built based on the mixed CPA/OPCPA plan. 


image006.png  

Features

  • Wide transmission region from 160 nm to 2600nm

  • Large effective second-harmonic-generation (SHG) coefficient (about three times that of KDP)

  • Good mechanical and physical properties

  • High damage threshold of 18.9 GW/cm2 for a 1.3 ns laser at 1053 nm

  • Both Type I and II NCPM in a wide wavelength range is possible

  • Wide acceptance angle and small walk-off

  • High optical homogeneity with δn≈10-6/cm

  • Spectral NCPM near 1300 nm             

Applications

  • Frequency doubling and tripling of Nd:YAG and Nd:YLF lasers.

  • SHG and THG for middle and high power Nd: lasers at 1064 nm for medical, industrial and military applications. 

  • SHG and THG of high power Nd: lasers at 1342 nm & 1319 nm for red and blue laser.

  • Optical parametric amplifiers (OPA) and oscillators (OPO) pumped by Excimer lasers and harmonics of Nd:YAG lasers.

  • Optical parametric chirped pulse amplification (OPCPA) in ultrafast pulse system.

Chemical and Physical Properties  

Property

Value

Chemical formula 

LiB3O5

Crystal structure

Orthorhombic, Space group Pna21, Point group mm2

Lattice Parameter

a=8.4473Å ,b=7.3788Å, c=5.1395Å, Z=2

Mass density 

2.47 g/cm3

Moh hardness

6

Melting point

About 834°C

Thermal conductivity

3.5W/m/K

Thermal expansion coefficient 

ax=10.8x10-5/K, ay= -8.8x10-5/K, az=3.4x10-5/K

Birefringence

Negative biaxial crystal: 2Vz = 109.2◦ at λ = 0.5321μm

Linear Optical Properties  

Property

Value

Transparency Range

169 - 2600 nm

Absorption Coefficient:

<0.1%/cm at 1064nm <0.3%/cm at 532nm

Refractive Indices

at 1.0642 mm

at 0.5321 mm

at 0.2660 mm

 

nx = 1.5656, ny = 1.5905, nz=1.6055

nx = 1.5785, ny = 1.6065, nz=1.6212

nx = 1.5973, ny = 1.6286, nz=1.6444

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

Nonlinear Optical Properties  

Property

Value

SHG Phase Matchable Range

551 ~ 2600nm (Type I) 790-2150nm (Type II)

NLO coefficients

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

Therm-Optic Coefficients

(°C,λ in μm)

dnx/dT=-9.3X10-6

dny/dT=-13.6X10-6

dnz/dT=(-6.3-2.1λ)X10-6

Angle Acceptance

6.54mrad-cm (Φ, Type I,1064 SHG)

15.27mrad-cm (q, Type II,1064 SHG)

Damage Threshold

at 1.064 mm

at 0.532 mm 

 

9 GW/cm2 (9 ns); 19 GW/cm2 (1.3 ns)

2.2 GW/cm2 (10 ns); 45 GW/cm2 (100 ps)

image011.png

Figure 2. SHG tuning curves of LBO

image013.png

Figure 3. OPO tuning curves of LBO (TypeI (ooe) in ‘XY’ plane) with different pump light, namely 530 nm, 355 nm and 266 nm

Polishing Specification

Property

Value

Orientation Tolerence

< 0.5°

Thickness/Diameter Tolerance

±0.05 mm

Surface Flatness

<λ/8@632 nm

Wavefront Distortion

<λ/4@632 nm

Surface Quality

10/5

Parallel

30〞

Perpendicular

15ˊ

Clear Aperture

>90%

Chammfer

<0.2×45°

Standard products  

Crystal

dimension/mm

Length/mm

Application

Orientation

Theta/Phi deg

AR Coatings S1/S2,nm/nm

3 x 3

10

THG@1064nm, Type II   (e-oe)

42.2/90

1064 + 532 / 355

3 x 3

15

SHG@1064nm, NCPM I Type

90/0

1064 + 532 / 1064 + 532

5 x 5

15

SHG@1064nm, Type I (e-oo)

90/11.6

1064 + 532 / 1064 + 532

 

6 x 6

0.9

SHG@1030nm

90/13.8

515 + 1030 / 515 + 1030

6 x 6

1.9

SHG@1030nm

90/13.8

515 + 1030 / 515 + 1030

6 x 6

2.8

SHG@1030nm

90/13.8

515 + 1030 / 515 + 1030

6 x 6

3.7

SHG@1030nm

90/13.8

515 + 1030 / 515 + 1030

8 x 8

0.9

SHG@1030nm

90/13.8

515 + 1030 / 515 + 1030

8 x 8

1.9

SHG@1030nm

90/13.8

515 + 1030 / 515 + 1030

8 x 8

2.8

SHG@1030nm

90/13.8

515 + 1030 / 515 + 1030

10 x 10

0.9

SHG@1030nm

90/13.8

515 + 1030 / 515 + 1030

10 x 10

1.9

SHG@1030nm

90/13.8

515 + 1030 / 515 + 1030

10 x 10

2.8

SHG@1030nm

90/13.8

515 + 1030 / 515 + 1030

10 x 10

3.7

SHG@1030nm

90/13.8

515 + 1030 / 515 + 1030

3 x 3

15

THG@1064nm, Type II (e-oe)

42.2/90

1064 + 532 / 355

3 x 3

15

SHG@1064nm, Type I (e-oo)

90/11.6

1064 + 532 / 1064 + 532

3 x 3

20

SHG@1064nm, NCPM I Type

90/0

1064 + 532 / 1064 + 532

5 x 5

15

THG@1064nm, Type II (e-oe)

42.2/90

1064 + 532 / 355

3 x 3

10

SHG@1064nm, Type I (e-oo)

90/11.6

1064 + 532 / 1064 + 532

Q&A

Q: What is phase mismatching?

A: A group of techniques for achieving efficient nonlinear interactions in a medium. Many phase-sensitive nonlinear processes, in particular parametric processes such as frequency doubling, sum and difference frequency generation, parametric amplification and oscillation, and also four-wave mixing, require phase matching to be efficient. Essentially, this means ensuring that a proper phase relationship between the interacting waves (for optimum nonlinear frequency conversion) is maintained along the propagation direction. Only if that condition is fulfilled, amplitude contributions from different locations to the product wave are all in phase at the end of the nonlinear crystal.

Q: What is Second harmonic generation (SHG)?

A: SHG is a nonlinear optical process, in which photons with the same frequency interacting with a nonlinear material are effectively "combined" to generate new photons with twice the energy, and therefore twice the frequency and half the wavelength of the initial photons.


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