Potassium dihydrogen phosphate crystals are widely used in electro-optic Q-switches (Nd:YAG, Nd:Y, Ti:sapphire, emerald as the source of lasers), and Pockels cells. DKDP crystals, which are deuterated more than 9%, are the most commonly used electro-optic crystals. This crystal is grown by the hydro solution method and can be grown to a very large size; therefore, they are the suitable at this stage for manufacturing low-cost and large-size finished nonlinear elements for second harmonic generation (SHG) and third harmonic generation (THG). Nd:AG laser wavelength of 1064 nm, I-type and II-type phase matching can be used for the nonlinear crystals KDP and DKDP.
Parameter index:
| Aperture | KDP max φ 400mm, DKDP max φ 150mm |
| Size tolerance | ± 0.1mm |
| Parallelism | ≤20 arc seconds |
| Verticality | ≤5 arc minutes |
| Surface finish | 20-10 |
| Flatness | λ/10 @ 633 nm |
| Angle tolerance | Δθ ≤ 0.25°, Δφ≤ 0.25° |
| Chamfer | ≤ 0.2mm x 45° |
| Crack | ≤ 0.1mm |
| age threshold | > 800MW/cm2 at 10Hz |
| Wavelength range | 250-2000nm |
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