<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%> OP-Unite Solutions Ltd - LiNbO3 Crystal, LN Crystal, Lithium Niobate Crystal
 
   
 
 

LiNbO3 Crystal

LiNbO3 Crystal (LN Crystal, Lithium Niobate Crystal) has a lot super performance, such as ,Piezoelectric Strain, electro-optic, voice-optic, nonlinear and so on. Due to its large Electro-Optic (E-O) and Acousto-Optic (A-O) coefficients, LiNbO3 crystal is the most commonly used material for Pockel Cells, Q-switches and phase modulators, waveguide substrate, and surface acoustic wave (SAW) wafers, etc.

LiNbO3 cystal is an most imporant and versatile one. It is of nonlinear¡¯s properties, and the nonlinear¡¯s coefficient is very large. Further more, it can enhance their performance through some special way. Mixing the Mg, then the LiNbO3 systal's laser damage threshold will be improved largely, as a result, it promote the use of LiNbO3 crystal in in nonlinear fields. Nd:Mg:LiNbO3 crystal, it can achieve the domino offect of self-frequency.

Mixing the Fe, then the LiNbO3 cystal will performace better in light storage in Electron-optic application. LiNbO3 crystal is a super material for light-wave transmit.Aslo, LiNbO3 crystal is a good Piezoelectric Stain one, it can be used in high _low frequency SAW filter or large power change machine.
 

 


1. Basic Properties

Crystal Structure

Trigonal, space group R3c

Cell Parameters a=b=5.148Å, c=13.863Å, Z=6

Melting Point

1250¡ãC

Curie Point

1140¡ãC

Mohs Hardness

5

Extinction Ratios 1000:1 (optical crystal)
Birefringence Gradient 10-5/cm (optical crystal)
SAW Velocities 3871 m/sec (zy-cut)
3488 m/sec (yz-cut)
3889 m/sec (yx-cut 128¡ãC)

Density

4.64g/cm3

Absorption Coefficient ~ 0.1%/cm @ 1064 nm
Solubility insoluble in H2O
Relative Dielectric Constant ¦ÅT11/¦Å0: 85
¦ÅT33/¦Å0: 29.5

Thermal Expansion Coefficient ( @ 25¡ãC)

|| a, 2.0x10-6/K
|| c, 2.2x10-6/K

Thermal Conductivity

38 W /m /K @ 25¡ãC


2. Linear Optical Properties

Transparency Range
                420-5200nm

LiNbO3.JPG (13114 bytes)
LiNbO3 Transparency Curve

Refractive Indices
                ne=2.146, no = 2.220 @ 1300 nm
                ne= 2.156, no = 2.232 @ 1064 nm
                ne= 2.203, no = 2.286 @ 632.8nm

Optical Homogeneity:
                ~ 5 x 10-5 /cm

Sellmeier Equations (l in mm):
                no2 (¦Ë) = 4.9048+0.11768/(¦Ë2 - 0.04750) - 0.027169¦Ë2
                ne2 (¦Ë) = 4.5820+0.099169/(¦Ë2 - 0.04443) - 0.021950¦Ë2


3. Nonlinear Optical Properties

NLO Coefficients

d33 = 34.4 pm/V
d31 = d15 = 5.95 pm/V
d22 = 3.07 pm/V

Efficiency NLO Coefficients

deff =5.7 pm/V or ~14.6 x d36 (KDP) for frequency doubling 1300 nm;
deff =5.3 pm/V or ~13.6 x d36 (KDP) for OPO pumped at 1064 nm;
deff =17.6 pm/V or ~45 x d36 (KDP) for quasi-phase-matched structure.

Electro-Optic Coefficients

¦ÃT33 = 32 pm/V, ¦ÃS33 = 31 pm/V
¦ÃT31=10 pm/V, ¦ÃS31=8.6 pm/V
¦ÃT22 = 6.8 pm/V, ¦ÃS22=3.4 pm/V

Half-Wave Voltage, DC
       Electrical field || z, light ¡Íz:
       Electrical field || x or y, light || z:


3.03 KV
4.02 KV

Damage Threshold

100 MW/cm2 (10 ns, 1064nm)


4. Standard Specifications of laser grade LiNbO3 crystals:

Transmitted Wavefront Distortion

better than ¦Ë/4 @ 633nm

Dimension Tolerance

(W¡À0.1mm) x (H¡À0.1mm) x (L¡À0.2mm)

Clear Aperture

over 90% central diameter

Flatness

¦Ë/8 @ 633nm

Surface Quality

20 /10 Scratch/Dig

Parallelism

better than 20 arc sec

Perpendicularity

5 arc min

Angle Tolerance

¦¤¦È< 0.5¡ã, ¦¤¦Õ < 0.5¡ã

AR-coating

Per your requirements


LiNbO3 Typical Orientations:
► ¦È¡Ù0¡ã, ¦Õ=-90¡ã, For SHG @ 1064nm Type I, fundamental wavelength range: 1.078¡ª3.5mm.

The following parameters are typically required to specify when ordering:
Sizes: Width x Height x Length (mm)
Phase matching angle: ¦È and ¦Õ
Coating on S1&S2: Protective coating or reflectivity @ wavelength

Dimension Tolerance

¡À0.1mm

Thickness Tolerance

¡À0.01mm

Clear Aperture

over 90% central diameter

Surface Flatness

10-15mm

Surface Quality

Ra<10Å

Bow

<20mm for ¦µ <60mm


LiNbO3 wafer typical orientations:
X, Y, Z, 127.86¡ãY, 64¡ãY, 135¡ãY, 41¡ãY

LiNbO3 wafer typical diameter and thickness:
¦Õ25.4mm, ¦Õ50.8mm, ¦Õ76.2mm, T=0.2~1.0mm

The following parameters are typically required to specify when ordering:
Sizes: Diameter, thickness
Orientation: Normal to surface
Surface finish: One surface or double / surfaces polished

Note: Other specifications of LiNbO3 crystals and coatings are available upon your request.