KDP, DKDP crystals
Main features
- Excellent ultraviolet radiation transmission
- The 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
- Standard 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. The nonlinearity of these crystals 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. The 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 | a= 7,448 Å, c= 6,977 Å | a= 7,4697 Å, c= 6,966 Å |
| Optical symmetry | 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 | no = 1,4938, ne = 1,4599 @1,06 µm | no = 1,4931; ne = 1,4582 @1,06 µm |
| 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/-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/4@632,8 nm |
| Coatings | AR coatings on both sides |
| 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/AR@532/266 nm
SHG@532 nm, type I
9421
470 €
KDP
15x15 mm
7 mm
76,5°
45°
AR/AR@532/266 nm
SHG@532 nm, type I
9422
490 €
DKDP
15x15 mm
13 mm
36,5°
45°
AR/AR@532+1064nm
SHG@1064 nm, type I
9423
800 €
DKDP
15x15 mm
13 mm
53,5°
0°
AR/AR@532+1064nm
SHG@1064 nm, type II
9424
800 €
DKDP
12x12 mm
20 mm
59,3°
0°
AR/AR@532+1064/355 nm
THG@1064, type II
9425
750 €
DKDP
12x12 mm
20 mm
53,5°
0°
AR/AR@1064/532+1064 nm
SHG@1064 nm, type II
9426
750 €
DKDP
15x15 mm
20 mm
53,5°
0°
AR/AR@1064/532+1064 nm
SHG@1064 nm, type II
9427
870 €
DKDP
15x15 mm
20 mm
59,3°
0°
AR/AR@532+1064/355 nm
THG@1064 nm, type II
9428
870 €
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