KDP, DKDP

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KDP, DKDP

Potassium Dihydrogen Phosphate (KDP) and Deuterated Potassium Dihydrogen Phosphate (DKDP) are nonlinear optical materials (NLO) known for their large NLO coefficients, wide transparency range and high optical damage threshold. These materials are used mostly for frequency conversion by second-harmonic generation (SHG) and for electro-optical modulation.

Main Properties

Characteristics

KDP

DKDP

Chemical Formula

KH₂PO₄

KD₂PO₄

Crystal Structure

Tetragonal

Tetragonal

Transmission Range, mm

0.2-1.5

0.2-1.6

Electro-optical Coefficients, pmV^-1

R₄₁=8.8, r₆₃=10.3

R₄₁=8.8, r₆₃=25

Nonlinear Coefficient

D₃₆=0.44

D₃₆=0.40

Temperature Synchronism Width, ^oC*cm

11.5

7.4

Spectral Synchronism Width, Å*cm

106

32

Angle Synchronism Width, mrad*cm

0.84

0.94

Optical Damage Threshold, GW/cm²
(l=1.064 mm, t =10 ns)

5

3

Absorption Coefficient, cm^-1

0.07

0.006

Mohs Hardness

2.5

2.5