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KDP / DKDP - Potassium Dihydrogen / Dideuterium Phosphate
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KDP / DKDP - Potassium Dihydrogen / Dideuterium Phosphate
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- Description
- Cas'Tech Class
- Parameters
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Introduction
Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (DKDP) are among the most widely-used commercial NLO materials, characterized by good UV transmission, high damage threshold, and high birefringence, though their NLO coefficients are relatively low. They are usually used for doubling, tripling and quadrupling of a Nd:YAG laser under the room temperature. In addition, they are also excellent electro-optic crystals with high electro-optic coefficients, widely used as electro-optical modulators, such as Q-switches, Pockels Cells, etc.
CASTECH's KDP & KD*P products
CASTECH supplies high quality KDP and DKDP crystals in large quantities for these applications. Because their polished surfaces are easier to be moistened, the user is advised to provide the dry condition (＜50%) and the sealed housing for preservation. For this purpose, CASTECH also provides polishing, coating and sealed housing services for the KDP family crystals. Our engineers will serve you to select and design the best crystal, according to the laser parameters you provide.
Table 1. Basic Properties
DKDP KDP Chemical Formula KD2PO4 KH2PO4 Transparency Range 200-2100 nm
(98% deuterium content)
200-1650 nm Nonlinear Coefficients d36 = 0.40 pm/V d36 = 0.44 pm/V Refractive Index (at 1064 nm) no = 1.4948, ne = 1.4554 no = 1.4938, ne = 1.4599 Electro-optic Coefficients r41 = 8.8 pm/V
r63 = 25 pm/V
r41 = 8.8 pm/V
r63 = 10.3 pm/V
Longitudinal Half-wave Voltage Vπ = 2.98 KV (λ = 546 nm) Vπ = 7.65 KV (λ = 546 nm) Absorption Coefficients 0.006 /cm 0.07 /cm Damage Threshold >3 GW/cm2 >5 GW/cm2 Extinction Ratio 30 dB Sellmeier Equations of DKDP: (λ in µm) no2 = 1.9575544 + 0.2901391 λ2 / (λ2 - 0.0281399) - 0.02824391 λ2 + 0.004977826 λ4
ne2 = 1.5057799 + 0.6276034 λ2 / (λ2 - 0.0131558) - 0.01054063 λ2 + 0.002243821 λ4
Sellmeier Equations of KDP: (λ in µm) no2 = 2.259276 + 0.01008956 / (λ2 - 0.012942625) + 13.00522 λ2 / (λ2 - 400)
ne2 = 2.132668 + 0.008637494 / (λ2 - 0.012281043) + 3.2279924 λ2 / (λ2 - 400)
Coatings
AR-Coatings are available with high quality upon request.
Key words:- KDP
- DKDP
- Potassium dideuterium phosphate
- Q-switch longitudinal
- half-wave voltage
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