KD*P Crystal

Introduction Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (KD*P ) are among the most widely-used commercial NLO materials. They are commonly used for doubling, tripling and quadrupling of Nd:YAG laser at the room temperature. In addition, they are also excellent electro-optic crystals with high electro-optic coefficients, widely used as electro-optical modulators, Q-switches, and Pockels Cells, etc. Good UV transmissionHigh optical damage thresholdHigh birefringence High nonlinear coefficientsPhysical and Optical Properties:KDP KD*P(DKDP) Chemical FormulaKH2PO4 KD2PO4 Crystal StructureTetragonal Tetragonal Transmission Range 200-1500nm 200-1600nm Nonlinear Coefficientsd36=0.44pm/V d36=0.40pm/V Refractive Indcies (at 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 VoltageVp=7.65KV(l=546nm) Vp=2.98KV(l=546nm) Absorption0.07/cm 0.006/cm Temperature Synchronism Width11.5 oC*cm 7.4 oC*cm Spectral Synchronism Width106 Å*cm 32 Å*cm Angle Synchronism Width0.84 mrad*cm 0.94 mrad*cm Absorption Coefficient, cm-10.07 0.006 Mohs Hardness2.5 2.5 Optical Damage Threshold>5 GW/cm2 >3 GW/cm2 Extinction Ratio30dB Sellmeier EquationsKDPno2 = 2.259276 + 0.01008956/(l2 - 0.012942625) + 13.005522l2/(l2 - 400) ne2 = 2.132668 + 0.008637494/(l2 - 0.012281043) + 3.2279924l2/(l2 - 400)DK*Pno2 = 1.9575544 + 0.2901391/(l2 - 0.0281399) - 0.02824391l2 +0.004977826l4 ne2 = 1.5005779 + 0.6276034/(l2 - 0.0131558) - 0.01054063l2 +0.002243821l4 Application: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 switchesKD*P Single Crystals — StandardDesignationOperationInputOutput53.7 °SHG (II)1064 nm532 nm59.5°THG (II)1064 nm + 532 nm355 nm63.7°SFM (II)1064 nm + (421-1000 nm)302-515 nm86°FHG (I) angle tune532 nm266nm90°FHG (I) temp. tune532 nm266 nm36.6°SHG (I)1064 nm532 nm46.8°THG(I)1064 nm + 532 nm355 nmKD*P Specifications Wavefront distortion: less than l/8 @ 633nm Dimension tolerance: (W± 0.1mm) x (H±0.1mm) x (L + 0.2mm/-0.1mm) Clear aperture: > 90% central area Flatness: l/8 @ 633nm Scratch/Dig code: 10/5 to MIL-O-13830A Parallelism: better than 20 arc seconds P erpendicularity: 5 arc minutes Angle tolerance: Dq <± 0.3°, Df <±0.3° Quality Warranty Period: one year under proper use Note: 1. KDP, KD*P&LiIO3 is highly hygroscopic and the coating can not be available. Please keep it in a dry environment, and sealed housing is recommended.2.The LiIO3 crystals is available too.3.KD*P & KDP are among the most widely-used commercial NLO materials, characterized by good UV transmission, high damage threshold, and high birefringence, though their NLO coefficients are relatively low.Because their polished surfaces are easy subject to moisten, the user recommends a dry condition (<50%) and the sealed housing for preservation.