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KTP
KTP (KTiOPO4) is an excellent nonlinear optical crystal in many optical systems like laboratory system, medical system, industrial system, etc. It is the most commonly used material for frequency doubling of Nd:YAG laser and other Nd-doped lasers, particularly at the low or medium power density. KTP’s properties also make it superior for electro-optic modulation, optical parametric generation.
Advantages

 Efficient frequency conversion
 Wide angular bandwidth and small walk off angle

● Large nonlinear optical coefficients

● Broad temperature and spectral bandwidth

● High thermal conductivity





Standard KTP

Dimension(mm)

Theta(Deg)

Phi(Deg)

Coating

Application

3*3*5

90

23.5

AR/AR@1064&532nm

SHG@1064,TypeⅡ

3*3*5

90

23.5

HR/AR@1064&532nm

SHG@1064,Type

3*3*10

90

23.5

AR/AR@1064&532nm

SHG@1064,TypeⅡ

3*3*10

90

23.5

HR/AR@1064&532nm

SHG@1064,TypeⅡ

5*5*10

90

23.5

AR/AR@1064&532nm

SHG@1064,TypeⅡ

7*7*5

90

23.5

AR/AR@1064&532nm

SHG@1064,TypeⅡ

7*7*20

90

0

AR/AR@1573&1064nm

OPO@1573&1064nm

Specifications

Material

KTP

Dimension

W×H:1×1~15×15mm, L:0.05-20mm

Dimension tolerance

W(+/-0.1)×H(+/-0.1)×L(+0.2/-0.1)mm

Angle Tolerance

+/-0.25°

Flatness

<λ/8 @ 633nm

Scratch/Dig

20/10

Parallelism

<30 arc seconds

Perpendicularity

<10 arc minutes

Wavefront Distortion

< λ/8 @ 633nm

Clear Aperture

> 90%

Damage Threshold

500MW/cm² @1064nm 10ns 10Hz

Anti-Reflection Coating

AR@1064nm R<0.2%+532nm R<0.5%

Properties

Crystal Structure

Orthorhombic, space group Pna21,point group mm²

Lattice Parameters

a=6.404Å, b=10.616Å, c=12.814Å, Z=8

Density

3.01 g/cm3

Mohs Hardness

5

Melting Point

around 1172℃

Absorption Coefficient

< 0.1%/cm@1.064μm, < 1%/cm@0.532μm

Thermal Conductivity

13W/m/K

Hygroscopic Susceptibility

no

Transparency Range

350nm-4500nm

SHG Phase Matchable Range

497~1800nm  (Type II)

Nonlinear Coefficient

d31=6.5pm/v

d32=5pm/v

d33=13.7pm/v

d24=7.6pm/v

d15=6.1pm/v

Therm-optic Coefficients (/℃)

dnx/dT=1.1X10-5

dny/dT=1.3X10-5

dnz/dT=1.6X10-5

Sellmeier Equations (λin um)    

Nx²=3.0065+0.03901/(λ²-0.04251)-0.01327λ²

Ny²=3.0333+0.04154/( λ²-0.04547)-0.01408λ²

Nz²=3.3134+0.05694/(λ²-0.05658)-0.01682λ²