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Nonlinear Crystals KDP, DKDP and ADP
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Potassium dihydrophosphates KDP (KH2PO4), DKDP or D*KDP (KD2PO4) and ADP (NH4H2PO4) are widely used as the second, third and fourth harmonic generators for Nd:YAG and Nd:YLF lasers. The crystals are also widely used for electro-optical applications as Q-switches for Nd:YAG, Nd:YLF, Ti:Sapphire and Alexandrite lasers, as well as for Pockels cells and as for acousto-optical applications. The most commonly used electro-optical crystal is DKDP with a deuteration more than 98%.
   These crystals are grown by a water-solution method and can be grown up to very large sizes. Therefore, they are as low-cost and large-size finished non-linear components available.
   For frequency-doubling (SHG) and -tripling (THG) of Nd:YAG laser at 1064 nm, both type I and type II phase-matchings can be employed for KDP and DKDP. For frequency - quadrupling (4HG, output at 266 nm) of Nd:YAG laser, KDP crystal is normally recommended.

   We provide as-cut unpolished blocks, polished high quality KDP, ADP and DKDP crystals in rods, squares or other shapes according to customer's requirements.

DKDP crystals can be supplied with a deuteration level of >94%, >96% and >98%.
MAIN PROPERTIES:

KDP
DKDP
ADP
Transparency range, µm 0.174 - 1.57 0.2 - 2.1 0.18 - 1.53
Symmetry class 42m 42m 42m
Lattice parameters, Å a=b=7.453; c=6.975 a=b=7.469; c=6.976 a=b=7.499; c=7.549
Density, g/cm3 2.338 2.355 1.803
Mohs hardness 2.5 2.5 2.0
Refractive index at 407.8 nm : no=1.52301; ne=1.47898 no=1.5185; ne=1.4772 no=1.53925; ne=1.49123

         at 632.8 nm

no=1.50737; ne=1.46685 no=1.5044; ne=1.4656 (at 623.4 nm) no=1.52195; ne=1.47727
         at 1064 nm no=1.4938; ne=1.4599 no=1.4948; ne=1.4554 no=1.5071; ne=1.4685
Non-linear coefficient at 1.064 µm, pm/V d36 = 0.39 d36 = 0.37 d36 = 0.47
Optical damage threshold, MW/cm2 300 - 600 (1064 nm, 20 ns) >100 (1064 nm, 20 ns) 500 (1064 nm, 60 ns)

The surfaces of KDP, DKDP and ADP crystals can be easily moistened. Customers should be very careful in the maintenance of crystal surfaces. The sealed housing is recommended for these crystals.

I N Q U I R Y    F O R M :

Material:
Quantity of elements:
Application:

For example: SHG@1064; SFG@800+267->200; DFG@780-842->10600; OPO@355->460÷560+960÷1150; etc.
polished sites:

BLOCK    or  BLOCK
 a-b b-c a-c
or d  
Type & angles:
 I  II angles:  theta  , phi
Dimensions/Tolerances:
For example:
10.0 +/- 0.1
Coating:

For example: p-coating, ARC s1/s2 1064 R<0.25%; ARC s1/s2 1064 R<0.25%+532<0.5%;
BBAR s1/s2 1064 R<1%+3÷10<5% etc.
a = mm;
c = mm
b     = mm or
dia. = mm;
This field is for additional information such as application,
comments, add. requirements etc.

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