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Potassium Dihydrogen Phosphate (KDP)

Potassium Dihydrogen Phosphate (KH2PO4) is a crystal noted for its non-linear optical properties. It has been used as electro-optical polarization rotators to vary the intensity and frequency doubling of Nd:YAG laser. It is hygroscopic, very fragile, lacks mechanical strength, and is sensitive to thermal shock; consequently, it must be handled with care and kept dry.

  Transparency Range (nm) 180~1500
 
  Crystal Symmetry Class Tetragonal, D2d
 
  Lattice Constant (Å) a=7.4529, c=6.9751
 
  Crystal Class Negative Uniaxial
 
  Hygroscopic Susceptibility hygroscopic
 
  NLO Susceptibility d36  (m/V)
(at 1.06um)
0.63X10-12
 
  Constant of Dispersion (dn/dT) (/°C)
(20~40°C at 1.06um)
dno/dT=-48X10-6
dne/dT=-31X10-6
 
  Electro-Optical Coefficients (m/v)
r41=8.8X10-12
r63=10.3X10-12
 
  Refractive Indices no=1.5079, ne=1.4673 at 632.8nm
no=1.4944, ne=1.46035 at 1064nm
 
  Density (g/cm3) 2.3325  
  Table 1: KDP physical and optical properties
 

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