Potassium Dihydrogen Phosphate

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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, D_2d
	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