KDP KD*P

KDP and KD*P are among the most widely-used NLO materials, characterized by good UV transmission, high damage threshold, and high birefringence.

They are usually used for doubling, tripling and quadrupling of a Nd:YAG laser under the room temperature. In addition, they are also excellent electro-optic crystals with high electro-optic coefficients, widely used as electro-optical modulators, such as Q-switches, Pockels Cells, etc.

Applications

Second, third, and fourth harmonic generation of Nd:lasers

Frequency doubling of dyer laser

High power laser frequency conversion materials

Shutter for high speed photography

Electro-optical modulator and Q switches

Properties

 

KDP

KD*P

Chemical Formula

KH2PO4

KD2PO4

Transparency Range

200-1500nm

200-1600nm

Nonlinear Coefficients

d36=0.44pm/V

d36=0.40pm/V

Refractive Index (at 1064nm)

no=1.4938, ne=1.4599

no=1.4948, ne=1.4554

Absorptance

0.07/cm

0.006/cm

Optical Damage Threshold

>5 GW/cm2

>3 GW/cm2

Extinction Ratio

30dB

Sellmeier Equations of KDP(λ in um)

no2 = 2.259276 + 0.01008956/(λ2 - 0.012942625) + 13.005522λ2/(λ2 - 400)
ne2 = 2.132668 + 0.008637494/(λ2 - 0.012281043) + 3.2279924λ2/(λ2 - 400)

Sellmeier Equations of K*DP( λ in um)

no2 = 1.9575544 + 0.2901391/(λ2 - 0.0281399) - 0.02824391λ2 +0.004977826λ4
ne2 = 1.5005779 + 0.6276034/(λ2 - 0.0131558) - 0.01054063λ2 +0.002243821λ4

 

 

Specifications

Dimension Tolerance

±0.1mm

Angle Tolerance

Δθ<0.5°, ΔΦ<0.5°

Surface Flatness

<λ/8@633nm

Wavefront Distortion

<λ/4@633nm

Parallelism

<20 arc seconds

Perpendicularity

<15 arc minutes

Surface Quality

20/10 Scratch and Dig

Clear Aperture

>95%



 

 

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