Account
Related Products

KDP/KD*P Crystals

KDP/KD*P Crystals
KDP/KD*P Crystals KDP/KD*P Crystals

Characterized by the excelent UV transmission, high damage threshold, and high birefringence, KDP (Potassium Dihydrogen Phosphate)  and KD*P (Potassium Dideuterium Phosphate) are among the most widely-used commercial NLO materials for doubling, tripling and quadrupling of Nd:YAG laser at room temperature or an elevated temperature. In addition, they are also excellent electro-optic (EO) crystals with high electro-optic coefficients, widely used as electro-optical modulators and Pockels cells for Q-switched lasers. One disadvantage of KDP/KD*P crystals is that they are highly hygroscopic. protective coating or a sealed housing with transmitting windows is recommended for protection of the crystal faces.

Please use "Add to Cart" to place the interesting products in the shopping cart. Check out with online payment or ask us for the prices/availability via the shopping cart. Filters below or the form at the bottom can be used to assist product search or make further inquiries.
Application:
Thickness:
Part No. Description Application Thickness Price Availability Add to Cart


Basic Physical and Optical Properties:
 

   

KDP

KD*P(DKDP)

Chemical Formula

KH2PO4

KD2PO4

Crystal Structure

Tetragonal

Tetragonal

Transmission Range

200-1500 nm

200-1600 nm

Nonlinear Coefficients

d36=0.44 pm/V

d36=0.40 pm/V

Refractive Indices
(at 1064 nm)

no=1.4938,
ne=1.4599

no=1.4948,
ne=1.4554

Electro-Optical Coefficients

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

r41=8.8 pm/V
r63=25 pm/V

Mohs Hardness

2.5

2.5

Surface Damage Threshold (@10 Hz, 10 ns, 1064 nm )

0.5 GW/cm2

0.5 GW/cm2

Sellmeier Equations of KDP
 (λ in µm)

no2 = 2.259276 + 13.005522λ2/(λ2 - 400)+
         0.01008956/(λ2 - 0.012942625)
ne2 = 2.132668 +3.2279924λ2/(λ2 - 400) +
         0.008637494/(λ2- 0.012281043)
Sellmeier Equations of KD*P
 (λ in µm)
no2 = 2.240921 + 2.246956λ2/(λ2 -126.92073)+
         0.009676/(λ2 - 0.0156203)
ne2 = 2.126019 + 0.784404λ2/(λ2 - 123.40344) +
         0.008578/(λ2- 0.0119913)



Cut Orientations for KDP/KD*P Crystal
 

Process (PM type)

 KDP KD*P
Orientation Deff(pm/V) Orientation Deff(pm/V)

SHG (II): 1064 nm -> 532 nm

58.9

0.34

53.5°

0.34

THG (II): 1064+532 -> 355 nm

 58.4

 0.37

59.4°

0.33

SFG (II): 1064+(421-1000 nm) -> 302-515 nm

61.0

0.36

63.7° 0.31

FHG (I): 532 nm -> 266 nm

76.7

0.46

85.9°

0.43

NCPM FHG (I): 532 -> 266 nm

90°(T=250°C)

0.47

90°(T=55°C)

0.43

SHG (I): 1064 nm -> 532 nm

41.1

 0.26

36.6°

0.22

THG(I): 1064+532 -> 355 nm

47.4

0.32

46.8°

0.29


Specifications on finished crystals:
 

Wavefront distortion:

less than λ/8 @ 633 nm

Dimension tolerance:

(W ± 0.1 mm) x (H ± 0.1 mm) x (L + 0.2/-0.1 mm)

Clear aperture:

> 90% central area

Flatness:

λ/8 @ 633 nm

Surface Quality:

Scratch/Dig 10/5 per MIL-O-13830A

Parallelism:

better than 20 arc seconds

Perpendicularity:

5 arc minutes

Angle tolerance:

Δθ < +/-0.5 deg, Δφ < +/-0.5 deg

   

Crystal Handling:

KDP, KD*P are highly hygroscopic and have to be used/stored in a very dry environment. A small enclosure (with openings for light) may be built around the crystal with a continuous flow of dry nitrogen or air into the enclosure. The dry nitrogen/air pressure needs only to be slightly above the atmosphere to keep the small volume around the crystal dry and clean.
 

Coating:

Single layer protective coating or anti-reflection coatings are available upon request.

Uncoated crystals can also be housed in a sealed housing with AR coated windows (shown at the right).


 

If you do not find the suitable products above, you may let us know your requirements or applications in the form below. Our sales or technical staff will get back to you as soon as possible.

Please provide your contact information for us to get back to you:

Name:
Title:
Organization:
Work Phone:
E-Mail Address:
Enter the code in the box below:
 
 
Newlight Photonics Inc. © 2017