KDP  and  DKDP(KD*P)  Crystal

Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate(KD*P) 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. They are usually used for doubling , tripling and quadrupling of a Nd:YAG laser at the room temperature. In addition, they are also excellent electro-optic coefficients , widely used as electro-optical modulators, such as Q-switches, Pockels Cell,etc.

Notes : Because their polished surface easier moistens, however, the user is advised to provide a dry condition(<50%) and the sealed housing for preservation.

Physical and Optical Properties:

Chemical Formula                      KH₂PO₄ 　　　　　　　　KD₂PO₄
Transparency Range                   178-1580nm 　　　　　　200-2150nm
Density(g/cm³)                         2.332 g/cm³ 　　　　　 2.335g/cm³
Lattice Parameters                     a=b=0.7453nm 　　　　　a=b=0.7469nm
　　    　　　　　　               　c=0.6975nm 　　　　　　c=0.6976nm
Thermal expansion coefficient(/K)       a1=a2=24.9x10^-6/K 　　 a1=a2=19x10^-6/K
  Symmetry                             42m                        42m
Thermal conductivity(W/cm/C         k1=k2=1.34W/mK 　　　　k1=k2=2.09W/mK
　　    　　　　 　 　              k3=1.21W/mK 　　　　　 k3=1.86W/mK
Transparency Range(nm)               178-1580nm 　　　　　　200-2150nm
Absorption  Coefficient(cm^-1):

@1.064μm                    0.03/cm 　　　　　　 　0.005/cm
Relative Dielectric Constant             @ 1KHz， 25℃