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
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KDP
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KD*P
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Chemical Formula
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KH2PO4
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KD2PO4
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Transparency Range
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200-1500nm
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200-1600nm
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Nonlinear Coefficients
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d36=0.44pm/V
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d36=0.40pm/V
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Refractive Index (at 1064nm)
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no=1.4938, ne=1.4599
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no=1.4948, ne=1.4554
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Absorptance
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0.07/cm
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0.006/cm
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Optical Damage Threshold
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>5 GW/cm2
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>3 GW/cm2
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Extinction Ratio
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30dB
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Sellmeier Equations of KDP(λ in um)
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no2 = 2.259276 + 0.01008956/(λ2 - 0.012942625) + 13.005522λ2/(λ2 - 400)
ne2 = 2.132668 + 0.008637494/(λ2 - 0.012281043) + 3.2279924λ2/(λ2 - 400)
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Sellmeier Equations of K*DP( λ in um)
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no2 = 1.9575544 + 0.2901391/(λ2 - 0.0281399) - 0.02824391λ2 +0.004977826λ4
ne2 = 1.5005779 + 0.6276034/(λ2 - 0.0131558) - 0.01054063λ2 +0.002243821λ4
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Specifications
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Dimension Tolerance
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±0.1mm
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Angle Tolerance
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Δθ<0.5°, ΔΦ<0.5°
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Surface Flatness
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<λ/8@633nm
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Wavefront Distortion
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<λ/4@633nm
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Parallelism
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<20 arc seconds
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Perpendicularity
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<15 arc minutes
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Surface Quality
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20/10 Scratch and Dig
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Clear Aperture
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>95%
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