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DKDP/KDP crystal
    Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (KD*P orDKDP) are among the most widely-used commercial NLO materials, characterized by good UV transmission, high damage threshold, and high birefringence, though their NLO coefficients are relatively low. 
  • DETAIL
  • STANDARD PRODUCT
  • BASIC PROPERTIES

  • Applications:

        ● Electro-optical modulator, Q-switches;

        ● Shutter for high speed photography;

        ● Second, third and fourth harmonic generation, frequency double for dye laser;

        ● High power laser frequency conversion materials;

     

    CRYSTIK‘s DKDP/KDP is featured by：

        ● High Extinction Ratio

        ● Low Insertion Loss

        ● High damage threshold

        ● Wide working temperature range

        ● Low capacitance

        ● Low current Leakage

     

     CRYSTIK offers：

        ● Strict quality control;
        ● Large crystal size up to 150x150x40mm3 （KDP）;

        ● Quick delivery (2 weeks for polished only, 3 weeks for coated);
        ● Unbeatable price and quantity discount;
        ● Technical support

        ● AR-coating, mounting and re-polishing service.


  • Standard product


    Dimension Tolerance

    W(+/-0.1)*H(+/-0.1)*L(+0.5/-0.1)mm

    Angle Tolerance

    +/-0.25°

    Perpendicularity

    ≤10′

    Scratch/Dig

    10/5

    Chamfer

    ≤0.2mmx45°

    Parallelism

    ≤10″

    Chips

    ≤0.1mm

    Flatness

    λ/10@633nm

    Clear Aperture

    ≥90%

    Wavefront distortion

    λ/8@633nm

    Coatings

    C1---AR@1064(R<0.2%)&532(R<0.5%)

    C2--- AR@1064(R<0.2%)&532(R<0.5%)&355(R<0.5%)

    Damage Threshold

    500MW/cm² (1064nm, 10ns, 10Hz)


  • Property

    Chemical formula

    KH2PO4

    KD2PO4

    Symmetry

    42m

    42m

    Density (g/cm3)

    2.332

    2.335

    Lattice parameters

    a = b =7.453 Å c=6.293Å

    a=b=7.469 Å c=6.976Å

    Thermal expansion coefficient (m/K)

     

     

     

     

    Thermal conductivity (W/cm /K)

    -----

    K1 = K2 =1.9×10-2

    K3=2.1×10-2

    Transmission

    200～1580nm

    200～2150nm

    Absorption (%/cm at 1064nm)

    3

    0.5

    Curie temperature (K)

    222

    123

    Relative dielectric constant

    at 1 KHz, 25ºC


       

    42

    65

     

    44

    58

     

    21

    50


    21

    48

    NLO coefficient (pm/v)

    0.43

    0.40

    Longitudinal half-wave voltage

    8.8Kv (658.3nm)

    3.5-4Kv (632.8nm)

    SHG phase-matching angle at 1064nm

    Type Ⅰ

    41º

    36.6º

    Type Ⅱ

    59º

    53.5º

    Refractive indexes

    1064nm

    no

    1.4942

    1.4931

    ne

    1.4603

    1.4583

    532nm

    no

    1.5129

    1.5074

    ne

    1.4709

    1.4681


    355nm

    no

    1.5377

    1.5257

    ne

    1.4867

    1.4683

    Sellmeier equation

    Ni^2=Ai+ Bi /(λ^2-Ci^2)-Diλ^2 /（λ^2－E）


    A

    B

    C

    D

    E

    For KDP

    no

    2.2576

    0.0101

    0.0142

    1.7623

    57.8984

    ne

    2.1295

    0.0097

    0.0014

    0.7580

    127.0535

    For DKDP

    no

    2.2409

    0.0097

    0.0156

    2.2470

    126.9205

    ne

    2.1260

    0.0086

    0.0120

    0.7844

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