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Lithium Triborate (LiB3O5 or LBO) is an attractive nonlinear optical crystal with combination of number of the following unique features: wide transparency region (from 150nm in UV to 2.6μm in IR) and Type I and Type II NCPM range (0.95~1.8μm), high damage threshold (>10GW/cm2 for 1.064μm, 20ns, 50Hz), high effective non-linear coefficient, very small walk-off angle and wide acceptance angle, excellent optical homogeneity (Dn~10-6/cm). On the base of above perfect properties, LBO is a very useful nonlinear optical material, especially for SHG of high-intensity laser radiation, intracavity SHG, deep-UV SFG and OPO applications. Typical applications are listed as follows:
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| i) Frequency Generation - Fundamental wavelengths of phase matching cut off at 554nm for SHG, at 794nm for THG, down to about 165nm for SFM, so we can get SHG of high peak power pulsed laser: Nd doped, Ti:Sapphire (650-1100nm), Alexandrite (720-800nm), Dye lasers and Copper-vapor (578nm); and THG of Nd doped, Ti:Sapphire, Alexandrite lasers; |
| ii) Optical parametric oscillators (OPO) - Tunable solid-state lasers using UV (308, 355 nm), visible or IR (1064 nm) as the pump in OPO process of both Type I and Type II phase-matching; |
| iii) Non-critical phase-matching (NCPM) for conversion of CW and quasi-CW radiation: Temperature-controllable (around 150°C for SHG of 1064nm) NCPM (walk-off is null) for nominal 1.0-1.3μm, Type I SHG; Room temperature, quasi-NCPM (angle tune while maintaining q=90°) for Type II SHG (0.8-1.1μm) and THG (0.95-1.2μm), a unique capability attributable to its biaxiality partly. |
Physical and Chemical Properties
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| Crystal Structure |
Orthorhombic, Point group mm2, Space group Pna21 |
| Lattice Parameters |
a=8.4473Å, b=7.3789Å, c=5.1405Å, z=2 |
| Density |
2.47 g/cm3 |
| Mohs Hardness |
5.5 |
| Melting Point |
835 ±5°C |
| Optical Homogeneity |
Dn~10-6/cm |
| Absorption Coefficient |
< 0.03%/cm @1.064μm, < 0.1%/cm @0.532μm |
| Thermal Conductivity |
3.5 W/m/K |
| Thermal Expansion Coefficient |
ax=10.8x10-5/K, ay=-8.8x10-5/K, az=3.4x10-5/K |
| Hygroscopisity |
Non |
Optical and NLO Properties
|
| Transparency Region |
155nm ~ 2.6μm |
| Phase Matching Range |
| 550nm ~ 2.60μm - Type I SHG |
| 790nm ~ 2.15μm - Type II SHG |
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Nonlinear Optical Coefficients |
| deff(I)=d32cosφ |
(Type I in XY plane) |
|
| deff(I)=d31cos2θ+d32sin2θ |
(Type I in XY plane |
| deff(II)=d31cosθ |
(Type II in YZ plane) |
| deff(II)=d31cos2θ+d32sin2θ |
(Type II in XZ plane) |
|
| (where θ & φ are polar angles referring to Z & X axis) |
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Non-vanished NLO susceptibilities |
d31=1.08±0.09 pm/V, d32= -0.98±0.09 pm/V, d33=0.05±0.006 pm/V |
Sellmeier Equations |
(l in μm) |
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| nx2=2.4541+0.01125/(l2-0.01135)-0.0146l2-6.6x10-5l4 |
| ny2=2.5391+0.01271/(l2-0.01252)-0.0185l2+2.0x10-4l4 |
| nz2=2.5862+0.0131/(l2-0.01189)-0.0180l2-2.26x10-4l4 |
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Refractive Indexes |
nx |
ny |
nz |
|
1.5656 |
1.5905 |
1.6055 |
(@1.064μm) |
1.5785 |
1.6065 |
1.6212 |
(@0.532μm) |
1.5973 |
1.6286 |
1.6444 |
(@0.355μm) |
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| Angular Acceptance |
| 6.55 mrad-cm - Type I SHG @1.064μm |
| 15.31 mrad-cm -Type II SHG @1.064μm |
| 51 mrad-cm - Type I NCPM SHG @1.064μm |
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Walk Off Angles |
| 0.51°-Type I, 0.2°-Type II |
(SHG@1.064μm) |
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| Spectra Acceptance |
| 1.0nm-cm -Type I, 1.3nm-cm -Type II |
(SHG@1.064μm) |
|
Thermal Acceptance |
| 4.6°C-cm -Type I, 7.7°C-cm - Type II |
(SHG@1.064μm) |
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NCPM SHG Temperature |
Type I @0.95~1.3μm |
Type I @1.3~1.8μm |
Type II @1.1~1.5μm |
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| T=-1893.3l4+8886.6l3-13019.8l2+5401.5l+863.9 |
| T=878.1l4-6954.5l3+20734.2l2-26378l+12020 |
| T=-21630.6l4+112251l3-220460l2+194153l-64614.5 |
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| Damage Threshold |
| > 10 GW/cm2 @1.064μm, 20 ns, 50 Hz |
| > 7 GW/cm2 @0.532μm, 10 ns, 10 Hz |
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| Conversion Efficiency |
| > 70% (1.064 mm, 20 ns, 50 Hz, 2 W) |
| > 55% (1.064 mm, quasi CW, 2 W) |
| > 40% (0.80 mm, 20 ns, 50 Hz, 2 W) |
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Fabrication specifications
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| Dimensional Tolerance |
| (W±0.1mm) x (H±0.1mm) x (L+0.2/-0.1 mm) |
(L≥2mm) |
| (W±0.1mm) x (H±0.1mm) x (L±0.1 mm) |
(L<2mm) |
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| Cutting Angle Tolerance |
Dq< ±0.2°, Df< ±0.2° |
| Wavefront Distortion |
<Lambda/8 @633 nm |
| Chamfer |
≤ 0.15 mm x 45° |
| Perpendicularity |
< 5 arc minutes |
| Parallelism |
< 20 arc seconds |
| Flatness |
< l/10 @632.8 nm |
| Scratch/Dig Code |
10/5 per MIL-PRF-13830B |
| Clear Aperture |
> Central 90% |
| Antireflection Coating |
R < 0.2% @1.064μm, R < 0.5% @0.532μm IAD coating |
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Lasertec can manufacture and supply IAD coating for single-band, dual-band and broad-band AR- coatings featured by anti-moisture and long durability, low reflectance, and high damage threshold for LBO at versatile applications (extra- and intra- cavity SHG, THG, OPO, etc.)
.Typical AR-coatings and residual reflectivities are listed below for reference. AR-coatings at other wavelengths are available upon customers' requests.
Anti-Reflective Coatings (AR-coatings) |
| Single-band AR Coatings |
AR@1.5μm, 1.064μm, 0.85μm, 0.532μm, 0.355μm, etc. (R<0.05~0.15%) |
| Dual - band AR Coatings |
AR@1.34/0.67μm, 1.064/0.532μm, 1.053/0.527μm, 1.047/0.523μm, 0.946/0.473μm, 0.8/0.4μm, 0.532/ 0.266μm (Rw<0.2%, R2w<0.5%) |
| Broad-band AR Coatings |
AR@0.7~1.0μm, 0.8~0.95μm/0.4~0.475μm, 0.4 ~0.75μm/0.355μm, etc. (Rave<0.5~1%) |
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Standard Specification |
| Part Number |
Type |
Dimension |
Application |
Coating |
In stock |
| L1S-2215 |
I |
2x2x15 mm |
SHG1064nm |
DBAR/DBAR |
10pcs |
| L1S-3310 |
I |
3x3x10 mm |
SHG1064nm |
DBAR/DBAR |
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| L1S-3315 |
I |
3x3x15 mm |
SHG1064nm |
DBAR/DBAR |
4pcs |
| L1S-4408 |
I |
4x4x8 mm |
SHG1064nm |
DBAR/DBAR |
1pcs |
| L1S-4410 |
I |
4x4x10 mm |
SHG1064nm |
DBAR/DBAR |
12pcs |
| L1S-4415 |
I |
4x4x15 mm |
SHG1064nm |
DBAR/DBAR |
1pcs |
| L1S-5515 |
I |
5x5x15 mm |
SHG1064nm |
DBAR/DBAR |
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| L1S-2210 |
I |
2x2x10 mm |
SHG946nm |
DBAR/DBAR |
10pcs |
| L1S-2215 |
I |
2x2x15 mm |
SHG946nm |
DBAR/DBAR |
30pcs |
| L2S-4415 |
II |
4x4x15 mm |
SHG1064nm |
DBAR/DBAR |
5pcs |
| L2S-4420 |
II |
4x4x20 mm |
SHG1064nm |
DBAR/DBAR |
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| L2S-5515 |
II |
5x5x15 mm |
SHG1064nm |
DBAR/DBAR |
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| L1T-3314 |
II |
3x3x14 mm |
THG1064nm |
DBAR/AR |
9pcs |
| L1T-4420 |
I |
4x4x20 mm |
THG1064nm |
DBAR/AR |
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| L1T-5520 |
I |
5x5x20 mm |
THG1064nm |
DBAR/AR |
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| L2T-4420 |
II |
4x4x20 mm |
THG1064nm |
DBAR/AR |
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| L2T-4425 |
II |
4x4x25 mm |
THG1064nm |
DBAR/AR |
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| L2T-5520 |
II |
5x5x20 mm |
THG1064nm |
DBAR/AR |
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| L2T-6315 |
II |
6x3x15 mm |
THG1064nm |
DBAR/AR |
5pcs |
| L1N-3320 |
I |
3x3x20 mm |
NCPM1064nm |
DBAR/DBAR |
1pcs |
| L1N-3330 |
I |
3x3x30 mm |
NCPM1064nm |
BBAR/BBAR |
|
| L1N-4415 |
I |
4x4x15 mm |
NCPM1064nm |
DBAR/DBAR |
|
| L1N-4420 |
I |
4x4x20 mm |
NCPM1064nm |
BBAR/BBAR |
8pcs |
| L1N-5515 |
I |
5x5x15 mm |
NCPM1064nm |
DBAR/DBAR |
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| L1O-3320 |
I |
3x3x20 mm |
OPO |
AR/BBAR |
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| L1O-3330 |
I |
3x3x30 mm |
OPO |
AR/BBAR |
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| L1O-4420 |
I |
4x4x20 mm |
OPO |
AR/BBAR |
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| L1O-5515 |
I |
5x5x15 mm |
OPO |
AR/BBAR |
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| L2O-3320 |
II |
3x3x20 mm |
OPO |
AR/BBAR |
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| L2O-4420 |
II |
4x4x20 mm |
OPO |
AR/BBAR |
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| L2O-5520 |
II |
5x5x20 mm |
OPO |
AR/BBAR |
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| L2O-5525 |
II |
5x5x25 mm |
OPO |
AR/BBAR |
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| L1F-3315 |
I |
3x3x15 mm |
SFG |
MBAR/AR |
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| L1F-3320 |
I |
3x3x20 mm |
SFG |
MBAR/AR |
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| L1F-4420 |
I |
4x4x20 mm |
SFG |
MBAR/AR |
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| L1F-5520 |
I |
5x5x20 mm |
SFG |
MBAR/AR |
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| L2F-3315 |
II |
3x3x15 mm |
SFG |
MBAR/AR |
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| L2F-3320 |
II |
3x3x20 mm |
SFG |
MBAR/AR |
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| L2F-4420 |
II |
4x4x20 mm |
SFG |
MBAR/AR |
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| L2F-5520 |
II |
5x5x20 mm |
SFG |
MBAR/AR |
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| Notes: |
1. LBO in stock now, we can delivery goods within 48 hrs. |
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2. LBO of other dimensions or applications are available upon request. |
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