Good UV Transmission KDP Crystal NLO Crystals For Q Switch
Potassium Dihydrogen Phosphate, known as KDP crystal (KH2PO4), and its isomorphic crystals, deuterated KDP, known as KD*P or DKDP crystal (KD2PO4), Ammonium Dihydrogen Phosphate, known as ADP crystal (NH4H2PO4) are widely used in frequency doubling, frequency tripling and frequency quadrupling of Nd-doped laser systems, as well as the electro-optical modulators. DKDP is mainly used in Pockels Cells, and ADP is also used in Acousto-Optical devices.
Characterized by good UV transmission, high damage threshold, and high birefringence, Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (DKDP ) are among the most widely-used commercial NLO materials, though their NLO coefficients are relatively low. They are usually used for the doubling, tripling and quadrupling of Nd:YAG laser at room temperature. They are also excellent E-O crystals with high E-O coefficients, widely used as electro-optical modulators, such as Q-switches, Pockels Cells, etc.
Advantages:
Good UV transmission
High optical damage threshold
High birefringence
High nonlinear coefficients
Applications:
Laser frequency conversion — harmonic generation for high pulse energy,
Electro-optical modulation
Q-switching crystal for Pockels cells
Optical Properties:
| Crystal | DKDP(KD*P) | KDP | ADP |
| Transmitting Range(nm): | 200~2150 | 180~1550 | 180~1500 |
| Absorption(%/cm): | 0.5 | 3 | - |
| Nonlinear Optical Coefficient (pm/V): | 0.40 | 0.43 | 0.52 |
| Damage Threshold: (GW/cm2 @1064nm) | 5 | 5 | 6 |
| Refractive Indices: | @1064nm | no=1.4931 | no=1.4942 | no=1.5071 |
| ne=1.4583 | ne=1.4603 | ne=1.4685 |
| @532nm | no=1.5074 | no=1.5129 | no=1.5280 |
| ne=1.4683 | ne=1.4709 | ne=1.4819 |
| @355nm | no=1.5257 | no=1.5317 | no=1.5487 |
| ne=1.4833 | ne=1.4846 | ne=1.4994 |
| @266nm | no=1.5539 | no=1.5599 | no=1.5797 |
| ne=1.5071 | ne=1.5105 | ne=1.5261 |
| Sellmeier Equations: (l in µm) | N2 = A + B / (l2 - C) + Dl2/(l2- E) |
| A | no | 2.2409 | 2.2576 | 2.3041 |
| ne | 2.1260 | 2.1295 | 2.1643 |
| B | no | 0.0097 | 0.0101 | 0.0111 |
| ne | 0.0086 | 0.0097 | 0.0097 |
| C | no | 0.0156 | 0.0142 | 0.0133 |
| ne | 0.0120 | 0.0014 | 0.0129 |
| D | no | 2.2470 | 1.7623 | 15.1086 |
| ne | 0.7844 | 0.7580 | 5.8057 |
| E | no | 126.9205 | 57.8984 | 400.0000 |
| ne | 123.4032 | 127.0535 | 400.0000 |
Physical Properties:
| Crystal | KD*P(DKDP) | KDP | ADP |
| Crystal Structure: |  2m
|
| Density(g/cm3): | 2.355 | 2.332 | 1.799 |
| Color: | Colorless |
| Hygroscopic Susceptibility | High |
| Thermal Conductivity(10-2W/cm·K): | k11=1.9;k33=2.1 | - | - |
| Thermal Expansion Coefficients(10-5/K): | a11=1.9;a33=4.4 | - | -
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Product Tags:
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2.355g/cm3 DKDP NLO Crystals Potassium Dihydrogen Phosphat For Q Switch Images
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