KDP&DKDP Crystal

High deuteration ratio (>98.0%)
High homogeneity
Excellent internal quality
Top finish quality with high processing precision
Large block for various size and shapes
Very competitive price
Mass production, quick delivery

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Product Details

KDP (KH2PO) and DKDP/KD*P (KD2PO) are among the most widely-used commercial NLO materials. With good UV transmission, high damage threshold, and high birefringence, these material are usually used for doubling, tripling and quadrupling of Nd:YAG laser.


KDP&DKDP Crystal


With high E-O coefficient, KDP and DKDP crystals are also widely used to make Pockels cells for laser system, such as Nd:YAG, Nd:YLF, Ti-Sapphire, Alexandrite, etc. Even though DKDP with high deuteration is more commonly used, KDP and DKDP both can do phase matching of type I and type II for the SHG and THG of 1064nm Nd:YAG laser. We recommend KDP for FGH of Nd:YAG laser (266nm).


KDP&DKDP Crystal


As one of the major KDP/DKDP suppliers (source manufacturer) in the whole international market, WISOPTIC has high capability of material selection, processing (polishing, coating, gold-plating, etc). WISOPTIC confirms reasonable price, mass production, quick delivery and long guarantee period of these materials.


KDP&DKDP Crystal


WISOPTIC Standard Specifications* - KDP/DKDP 


Deuteration Ratio

> 98.00%

Dimension Tolerance

± 0.1 mm

Angle Tolerance

≤ ± 0.25°

Flatness

< λ/8 @ 632.8 nm

Surface Quality

< 20/10 [S/D] (MIL-PRF-13830B)

Parallelism

< 20”

Perpendicularity

≤ 5'

Chamfer

≤ 0.2mm @ 45°

Transmitted Wavefront Distortion

< λ/8 @ 632.8 nm

Clear Aperture

> 90% of central area

Laser Damage Threshold

> 500 MW for 1064nm, TEM00, 10ns, 10Hz (AR-coated)
> 300 MW for 532nm, TEM00, 10ns, 10Hz (AR-coated)

* Products with special requirement upon request.


Main Features - KDP/DKDP


• Good UV transmission
• High optical damage threshold
• High birefringence
• High nonlinear coefficients


Primary Applications - KDP/DKDP


• Laser frequency conversion – Second, third, and fourth harmonic generation for high pulse energy, low repetition (<100 Hz) rate lasers
• Electro-optical modulation
• Q-switching crystal for Pockels cells


Physical Properties - KDP/DKDP


  Crystal

KDP

DKDP

Chemical formula

KH2PO4

KD2PO4

Crystal structure

I42d

I42d

Space group

Tetragonal

Tetragonal

Point group

42m

42m

Lattice constants

a=7.448 Å, c=6.977 Å

a=7.470 Å, c=6.977 Å

Density

2.332 g/cm3

2.355 g/cm3

Mohs hardness

2.5

2.5

Melting point

253 °C

253 °C

Curie temperature

-150 °C

-50 °C

Thermal conductivity [W/(m·K)]

k11= 1.9×10-2

k11= 1.9×10-2, k33= 2.1×10-2

Thermal expansion coefficients (K-1)

a11= 2.5×10-5, a33= 4.4×10-5

a11= 1.9×10-5, a33= 4.4×10-5

Hygroscopicity

high

high


 Optical Properties - KDP/DKDP 


  Crystal

KDP

DKDP

Transparency region
  (at “0” transmittance level)

176-1400 nm 

200-1800 nm 

Linear absorption coefficients
(@ 1064 nm)

0.04 /cm

0.005 /cm

Refractive indices (@1064 nm) 

no=1.4938, ne=1.4601 

no=1.5066, ne=1.4681 

NLO coefficients (@1064 nm) 

d36=0.39 pm/V

d36=0.37 pm/V

Electro-optic coefficients

r41=8.8 pm/V, r63=10.3 pm/V

r41=8.8pm/V,r63=25 pm/V 

Longitudinal half-wave voltage

7.65 kV (λ=546 nm)

2.98 kV (λ=546 nm)

SHG conversion efficiency

20~30%

40~70%


 Phase matching angle for SHG of 1064 nm



KDP

DKDP

Type of phase matching

Type 1 ooe

Type 2 eoe

Type 1 ooe

Type 2 eoe

Cut angle θ

41.2°

59.1°

36.6°

53.7°

Acceptances for crystal of 1 cm length (FWHM):

Δθ (angle)

1.1 mrad

2.2 mrad

1.2 mrad

2.3 mrad

ΔΤ (thermal)

10 K

11.8 K

32.5 K

29.4 K

Δλ (spectral)

21 nm

4.5 nm

 6.6 nm

4.2 nm

Walk-off angle

28 mrad

25 mrad

25 mrad

25 mrad
















KDP&DKDP Crystal Test Report


KDP&DKDP Crystal Test Report


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