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LiNbO3 and MgO:LiNbO3

 

铌酸锂（LiNbO3）晶体被广泛用作1000nm以上波长的倍频和1064nm泵浦光的光参量放大,也可做准相位匹配. 同时,铌酸锂晶体也被广泛应用于光电调节器及波导材料,和用作Nd:YAG,Nd:YLF和掺Ti的蓝宝石激光Q开关. 美扬光电公司可为上述用途提供各种规格的高质量,大尺寸的铌酸锂晶体. 

Main Features:
 

  • Large Electro-Optic (E-O) coefficients
  • Large Acousto-Optic (A-O) coefficients

Typical Applications:

  • Frequency doublers
  • Optical parametric oscillators (OPO)
  • Quasi-phase-matched (QPM) device
  • Q-switches and modulator

Specifications:

Dimensional Tolerance
±0.1mm
Angle Tolerance
±0.5deg
Wavefront Distortion
<λ/4 @ 633nm
Surface Flatness
<λ/8 @ 633 nm
Surface Quality
20/10 Scratch and Dig
Parallelism
< 20 arc seconds
Perpendicularity
< 5 arc minuntes
Clear Aperture
> Central 90%
AR-Coating
dual waveband AR coating @1064/532 nm on both surfaces, with R < 0.2% @ 1064 nm and R < 0.5% @ 0.532 nm per surface

 Physical and Optical Properties
 

Crystal Structure
Trigonal, space group R3c
Cell Parameters
a = 0.515Å, c = 13.863Å, Z = 6Å
Melting Point
1255±5oC
Curie Point
1140±5oC
Mohs Hardness
5
Density
4.64 g/cm3
Absorption Coefficient
~ 0.1%/cm @ 1064 nm
Solubility:
insoluble in H2O
Relative Dielectric Constant
eT11/e0: 85
eT33/e0: 29.5
Thermal Expansion Coefficients( @ 25oC)
||a, 2.0 x 10-6/K
||c, 2.2 x 10-6/K
Thermal Conductivity
38 W /m /K @ 25oC
Transparency Range
420 - 5200 nm
Optical Homogeneity
~ 5 x 10-5 /cm
Sellmeier Equations( l in mm)
no2(l) = 4.9048+0.11768/(l2 - 0.04750) - 0.027169 l2
ne2(l) = 4.5820+0.099169/(l2- 0.04443) - 0.021950 l2
NLO Coefficients
d33 = 34.4 pm/V
d31 = d15 = 5.95 pm/V
d22 = 3.07 pm/V
Electro-Optic Coefficients
gT33 = 32 pm/V, gS33 = 31 pm/V
gT31 = 10 pm/V, gS31 = 8.6 pm/V
gT22 = 6.8 pm/V, gS22 = 3.4 pm/V
Half-Wave Voltage, DC
Electrical field ||z, light ^ z 3.03 KV
Electrical field ||x or y, light || z 4.02 KV
Efficiency NLO Coefficients
deff=5.7pm/V or~14.6xd36(KDP) for frequency doubling 1300 nm;
deff=5.3pm/V or~13.6xd36(KDP) for OPO pumped at 1300nm;
deff=17.6pm/V or~45xd36(KDP) for quasi-phase-matched structure;
Damage Threshold
200 MW/cm2

Standard Products Series

MT- Optics,Inc. can provide LiNbO3 products used for many applications, such as E-O modulator, waveguide substrate, frequency doubling, SAW wafer application and etc.
 

1. E-O modulator

Part No.
Dimension
Cut
Coating
Electrode
LNO001
3x3x15mm
Z-cut
AR/AR@1064nm
Au on X face
LNO002
4x4x15mm
Z-cut
AR/AR@1064nm
Au on X face
LNO003
6x6x25mm
Z-cut
AR/AR@1064nm
Au on X face
LNO004
9x9x25mm
Z-cut
AR/AR@1064nm
Au on X face

2. Waveguide substrate
 

Part No.
Dimension
End faces
LNO101
50x50x1mm
One surface polished, reverse fine ground

3. SAW Wafer

Part No.
Dimension
Thickness
End faces
LNO201
76.2mm
0.5mm
One surface polished, reverse fine ground

Note: 127.86deg Y cut, Y-cut, Z-cut and other cut also can be provided upon request.
 

Magnesium Oxide Doped Lithium Niobate Crystal

Compared with LiNbO3 crystal, MgO:LiNbO3 crystal exhibits its particular advantages for NCPM
frequency doubling (SHG) of Nd:Lasers, mixing (SFG) and optical parametric oscillators
(OPOs). MgO:LiNbO3 is also a good crystal for optical parametric oscillators (OPOs) and
amplifiers (OPAs), quasi-phase-matched doublers and integrated waveguide.

MgO:LiNbO3 has similar effective nonlinear coefficients to pure LiNbO3 . Its Sellmeier equations
(for MgO dopant 7 mol%) are:

no2=4.8762+0.11554/(λ2 - 0.04674) - 0.033119λ2

ne2=4.5469+0.094779/(λ2 - 0.04439) - 0.026721λ2


Lithium Tantalate Crystal

LiTaO3 crystal is also widely used as electro-optic modulator, with NLO and E-O properties
similar to those of LiNbO3 but higher damage threshold (>500 MW/cm for ns pulsed).
 

 

Note: 127.86deg Y cut, Y-cut, Z-cut and other cut also can be provided upon request.


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