Products Category

KD * P / KDP Potassium Dihydrogen Phosphate / Potassium

KDP potassium dihydrogen phosphate and dideuterium potassium phosphate (DKDP) have low nonlinear coefficient, but they are widely used in a variety of industrial uses due to their superior UV penetration, high damage threshold and high birefringent coefficient. These two crystals are usually used as two, triple, and quadruple frequency units of the Nd: YAG laser (at room temperature). In addition, they have high optical coefficient, so they are also used to make pukker boxes.

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Main Feature

Low nonlinear optical coefficients, wide transparent range, low loss, good optical uniformity, excellent temperature stability and high damage threshold

Material Properties

	KDP	KD*P
Chemical formula	KH2PO4	KD2PO4
Transmission range	200-1500nm	200-1600nm
Nonlinear coefficient	d36=0.44pm/V	d36=0.40pm/V
Refractive index (@1064nm)	no=1.4938，ne=1.4599	no=1.4948，ne=1.4554
Electro-optic coefficient	r41=8.8pm/Vr63=10.3pm/V	r41=8.8pm/Vr63=25pm/V
Longitudinal half wave voltage	Vπ=7.65KV(λ=546nm)	Vπ=2.98KV(λ=546nm)
Absorb	0.07/cm	0.006/cm
Damage threshold	＞5GW/cm2	＞3GW/cm2
Sellmeier equation of KDP
no2=2.259276+0.01008956/(λ2-0.012942625)+13.00522λ2/(λ2-400)ne2=2.132668+0.008637494/(λ2-0.012281043)+3.2279924λ2/(λ2-400)
Sellmeier equation of KD*P
no2=1.9575544+0.2901391λ2/(λ2-0.0281399)-0.02824391λ2+0.004977826λ4ne2=1.5005779+0.6276034λ2/(λ2-0.0131558)-0.01054063λ2+0.002243821λ4

Product Parameters

Dimensional tolerance	(W±0.1 mm)×(H±0.1 mm)×(L±0.2 mm)
Angle tolerance	Dq＜±0.3°, Df＜± 0.3°
Parallelism	＜20″
Verticality	＜5′
Optical aperture	Center diameter is 95%
Surface finish	10-5(MIL-0-13830A)
Flatness	＜λ/8 @633nm
Wavefront distortion	＜λ/8 @633nm