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Potassium Dihydrogen Phosphate

Material
KDP

 

Potassium Dihydrogen Phosphate (KDP or KH2PO4) is the most widely used commercial NLO material with wide transparency range, high birefringence and high optical damage threshold. KDP crystals are commonly used for frequency 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.

Properties
Optical and spectral properties
Transmission range
200 ‐ 1500
Refractive index @ 1064 nm
no = 1,4938

ne = 1,4599

NLO coefficients in pm/V
d36 = 0,44

Absorption coefficient in cm-1
0,07
Optical damage threshold in GW/cm2 (1064nm, 10ns)
>5
Physical properties
Chemical formula
KH2PO4
Density in g/cm3
2,35
Crystal structure
tetragonal
Electro-optical Coefficients in pm/V
r41 = 8,8

r63 = 10,3

Temperaturakzeptanz in °C· cm
11,5
Winkelakzeptanz in mrad· cm
0,84
spektrale Akzeptanz in Å· cm
106
Mohs hardness
2,5
Spectral properties
sample thickness: 10 mm
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