Potassium dihydrogen phosphate (KDP) and potassium dideuterium phosphate (KD*P) crystals offer excellent UV transmission, damage threshold and birefringence. Deuterated KDP, or KD*P, features an extended transmission range in the infrared, IR-shifted OH absorption bands, and an increased electro-optic coefficient. KD*P is grown at Inrad Optics and can be grown at varying deuteration percentages.

KDP and KD*P crystals are employed in a variety of frequency conversion applications. Among these are second, third and fourth harmonic generation in Q-switched and phase-locked Nd:YAG lasers.

In addition to harmonic generation, KDP and KD*P are well suited to use in Pockels cells and Q-switches due to their high electro-optic coefficients. They can be operated in transverse electro-optic geometries with large apertures while still maintaining low quarterwave voltages.

 

Material Properties
Chemical Formula KH2PO4 KD2PO4
Crystal Symmetry and Class tetragonal, -42m tetragonal, -42m
Lattice Parameters a = 7.460 Å a = 7.4697 Å
c = 6.965 Å c = 6.9766 Å
Density 2.332 g/cm3 2.355 g/cm3
Mohs Hardness 2.5 2.5
Optical Class Uniaxial negative Uniaxial negative
Transmission Range 0.2 µm - 1.7 µm 0.2 µm - 1.9 µm
Thermal Conductivity κ11 = 1.76 W/m∙K κ11 = 2.09 W/m∙K
κ33 = 1.30 W/m∙K κ33 = 1.86 W/m∙K
Thermal Expansion
for T = 293 - 1173 K
α11 = 19 x 10-6 /K
α33 = 44 x 10-6/K
α11 = 20.1 x 10-6 /K
α33 = 40.7 x 10-6 /K
Electro Optic Coefficients
@ 0.633 μm

T: unclamped
S: clamped

r63S = -8.8 pm/V
r63T = -10 pm/V
r63S = -24.1 pm/V
r63T = -25.8 pm/V

Dimensions

The solution growth process used for KDP and KD*P produces large single crystal boules, thus enabling cost effective large aperture crystals. Standard sizes range up to 60 mm in diameter, and much larger custom crystals are achievable.

Finishing

  • Protective AR coatings – both solgel and dielectric
  • Electrodes for Q-switches
  • Ring mounts compatible with standard optomechanics

Fill out this RFQ form for help in configuring your crystal.

Configuration Options

KDP Type I Standard Orientations
Designation Angle, θ Operation Input Output
A 83.3° SHG 518-535 nm 259-267 nm
B 69.1° SHG 531-595 nm 266-297 nm
B1 73.4° SHG 524-571 nm 262-285 nm
R6G 60.2° SHG 559-673 nm 280-336 nm
C 54.9° SHG 585-754 nm 293-377 nm
D 46.6° SHG 648-940 nm 324-470 nm
M2 64.6° SHG 543-648 nm 272-324 nm
MIX 1064nm + (294-383 nm) 231-281 nm
M3 76.4° SHG 520-557 nm 260-278 nm
THG 1064nm + (273-307 nm) 217-238 nm
41.2° SHG 1064 nm 532 nm
47.3° THG 1064 nm + 532 nm 355 nm
TSS 45° SHG 700-1000 nm 350-500 nm
         
KD*P Type I & II Standard Orientations
Designation Angle, θ Operation Input Output
53.7° SHG (II) 1064 nm 532 nm
M1 59.5° THG (II) 1064 nm + 532 nm 355 nm
SFM (II) 1064 nm + (421-1000 nm) 355 nm
86° FHG (II) angle tune 532 nm 302-515 nm
90° FHG (II) temp. tune 532 nm 266 nm
36.6° SHG (I) 1064 nm 532 nm
46.8° THG (I) 1064 nm + 532 nm 355 nm

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