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Arminas Butkus +370 5 219 4884
KDP, DKDP crystals
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KDP, DKDP crystals

Main features

 

  • Excellent ultraviolet radiation transmission
  • High laser induced damage threshold
  • Custom crystals available upon request

 

Application examples

 

  • Frequency doublers, triplers and quadruplers for Nd-doped lasers
  • Q-switches for Ti:Sapphire, Alexandrite, Nd-doped lasers
Request custom
  • Description
  • Properties
  • Specifications

Potassium dihydrogen phosphate (KH2PO4, KDP) and potassium dideuterium phosphate (KD2PO4, DKDP) crystals are one of the oldest used nonlinear materials. DKDP and KDP are known as analogs, though their properties differ due to DKDP deuteration. They both exhibit excellent ultraviolet transmission and high damage threshold. Thus nonlinearity is relatively low, these crystals can be grown in large size. They found their application as nonlinear frequency doublers, triplers and quandruplers of Nd-doped lasers and as Q-switch devices for Ti:Sapphire, Alexandrite, Nd-doped lasers. Main drawback is that these crystals are highly hygroscopic, therefore sealed housing and dry operating conditions have to be ensured.

Physical and optical properties
Chemical formula KH2PO4 (KDP) KD2PO4 (DKDP)
Crystal structure Tetragonal, 42m Tetragonal, 42m
Lattice parameters Negative uniaxial (no > ne) Negative uniaxial (no > ne)
Density 2,332 g/cm3 2,355 g/cm3
Mohs hardness 2,5 2,5
Transparency range 180 nm - 1,5 μm 200 nm - 2 μm
Refractive indices @1,06 μm no = 1,4938, ne = 1,4599 no = 1,4931, ne = 1,4582

 

KDP Sellmeier equations @T = 293 K (λ in μm) no2 = 2,259276 + 13,00522 λ2/(λ2 - 400) + 0,01008956/(λ2 - (77,26408)-1);

ne2 = 2,132668 + 3,2279924 λ2/(λ2 - 400) + 0,008637494/(λ2 - (81,42631)2)
DKDP Sellmeier equations @T = 293 K (λ in μm) no2 = 2,240921 + 2,246956 λ2/(λ2 - (11,26591)2) + 0,009676/(λ2 - (0,124981)2);

ne2 = 2,126019 + 0,784404 λ2/(λ2 - (11,10871)2) + 0,008578/(λ2 - (0,109505)2)
KDP and DKDP crystals
Orientation accuracy <30 arcmin
Clear aperture >90%
Face dimensions tolerance +0/-0,1 mm
Length tolerance ±0,1 mm
Parallelism error <20 arcsec
Perpendicularity error <5 arcmin
Protective chamfers <0,1 mm at 45°
Surface quality 20-10 S-D
Wavefront flatness <λ/[email protected],8 nm
Coatings Antireflective coatings on both faces
Laser induced damage threshold >10 J/cm2@1064 nm, 10 ns for KDP crystals
>5 J/cm2@1064 nm, 10 ns for DKDP
Mount Unmounted
Order your item
Material Face dimensions Length Theta Phi Coating Application SKU price quantity
KDP
12x12 mm
5 mm
76,5°
45°
AR/[email protected]/266 nm
[email protected] nm, type I
9421
360 €
KDP
15x15 mm
7 mm
76,5°
45°
AR/[email protected]/266 nm
[email protected] nm, type I
9422
415 €
DKDP
15x15 mm
13 mm
36,5°
45°
AR/[email protected]+1064nm
[email protected] nm, type I
9423
420 €
DKDP
15x15 mm
13 mm
53,5°
AR/[email protected]+1064nm
[email protected] nm, type II
9424
420 €
DKDP
12x12 mm
20 mm
59,3°
AR/[email protected]+1064/355 nm
9425
410 €
DKDP
12x12 mm
20 mm
53,5°
AR/[email protected]/532+1064 nm
[email protected] nm, type II
9426
410 €
DKDP
15x15 mm
20 mm
53,5°
AR/[email protected]/532+1064 nm
[email protected] nm, type II
9427
515 €
DKDP
15x15 mm
20 mm
59,3°
AR/[email protected]+1064/355 nm
[email protected] nm, type II
9428
515 €