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KDP & KD*P

Potassium Dihydrogen Phosphate or KDP and Potassium Dideuterium Phosphate KD*P  are widely-used NLO materials. They stand out because of their good UV transmission, high damage threshold, and high birefringence degree. They are usually used in Nd:YAG laser systems which are made to work at the room temperature. Moreover, they can operate as excellent electro-optic crystals. Because of their high electro-optic coefficient they are widely used as electro-optical modulators.

 

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  • Optola offers different sizes KDP and KD*P crystals. 
  • Variuos dimensions are available upon request.
Dimensional Tolerance+/-0.1mm
Wavefront Distortion< λ / 8@633nm
Chamfer<0.15mm x 45°
Perpendicularity< 5 arc min
Parallelism<15 arc sec
Flatness< λ / 10 @ 633nm
Surface quality10/5
AR coatingFrom visible to 3.3um
Chemical FormulaKH2PO4KD2PO4
Transparency Range200-1500nm200-1600nm
Nonlinear Coefficientsd36=0.44pm/Vd36=0.40pm/V
Refractive index(@1064nm)no=1.4938,ne=1.4599no=1.4948,ne=1.4554
Electro-optical Coefficientsr41=8.8pm/V

r63=10.3pm/V

r41=8.8pm/V

r63=25pm/V

Longitudinal half-wave voltageVπ=7.65KV(λ=546nm)Vπ=2.98KV(λ=546nm)
Absorptance0.07/cm0.006/cm
Optical damage threshold>5GW/cm2>3GW/cm2
Extinction ratio 30dB
Sellmeier equations of KDP (λ in μm)
no2=2.259276+0.01008956/(λ2-0.012942625)+13.00522λ2/(λ2-400)
ne2=2.132668+0.008637494/(λ2-0.012281043)+3.2279924λ2/(λ2-400)
Sellmeier equations of KD*P (λ in μm)
no2=1.9575544+0.2901391λ2/(λ2-0.0281399)-0.02824391λ2+0.004977826λ4
ne2=1.5005779+0.6276034λ2/(λ2-0.0131558)-0.01054063λ2+0.002243821λ4
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