KDP&DKDP

Potassium dihydrogen phosphate (KDP) and potassium dideuterium phosphate (DKDP or KD*P) crystals are functional crystals that have received early attention and have been widely used in nonlinear optical materials.

Classification:

Nonlinear Crystals

Detailed introduction

Potassium dihydrogen phosphate (KDP) and potassium dideuterium phosphate (KD*P) crystals are functional crystals that have received early attention and have been widely used in nonlinear optical materials. They can be used to amplify the power of Nd:YAG crystals at room temperature and have high electro-optic coefficients, making them ideal electro-optic crystals. They are commonly used in electro-optic modulators, Q switches, Pockels cells, and other applications.

Product features

Nonlinear optical coefficient is relatively low

Wide transparent range

Low loss

Good optical uniformity

Excellent temperature stability High damage threshold

Specifications
Dimensional Tolerance	(W±0.1 mm)×(H±0.1 mm)×(L±0.2 mm)
Angle Tolerance	Dq＜±0.3°, Df＜± 0.3°
Parallelism	＜20″
Perpendicularity	＜5′
Clear Aperture	≥Central 95% of the diameter
Surface Quality	10/5 (MIL-PRF-13830B)
Flatness	λ/8 @633nm
Wavefront Distortion	＜λ/8 @633nm

Crystal Chemistry and Structural Characteristics
Crystal structure	Orthorhombic
Lattice parameters	a=7.45Å, b=7.45Å, c=6.68Å(KDP), c=12.96Å(DKDP)
Melting point	960℃(KDP), 149℃(DKDP)
Mohs hardness	2(KDP), 2.5(DKDP)
Density	2.35g/cm³
Thermal conductivity	1.1W/(m·K)
Thermal expansion coefficient	a:6.5×10^-6/K, b:8.5×10^-6/K, c:1.5×10^-6/K(KDP) a:6.6×10^-6/K, b:8.6×10^-6/K, c:1.5×10^-6/K(DKDP)

Characteristic Parameters
Transmittance	＞90%(1064nm)
Optical uniformity	＜0.1%
Temperature stability	＜10^-5/K
Nonlinear optical coefficient	d36=0.39(pm/V)(KDP), d36=0.47(pm/V)(DKDP)
Thermal coefficient	dn/dT=7.5×10^-6/K(KDP), dn/dT=9.3×10^-6/K(DKDP)
Refractive index	no=1.4932, ne=1.4599(KDP,1064nm)
Nonlinear Coefficien(pm/v)	0.39(SHG), 0.37(THG)(KDP,1064nm)
Effective SHG coefficient (SHG, THG)	0.16(SHG), 0.08(THG)(KDP,1064nm)
Walk-off Angle (mrad·cm)	16.6(type I), 28.5(type II)(KDP,1064nm)
Acceptance Angle (mrad·cm)	11.3(type I), 19.2(type II)(KDP,1064nm)
Phase Matching Range (℃m)	275~1200(SHG), 500~2500(THG)(KDP,1064nm)
Temperature Acceptance (℃)	65(KDP,1064nm), 70(DKDP,1064nm)
Damage Threshold(GW/cm²)	~2(SHG), ~0.5(THG)