KDP & KD*P crystal Applications: Laser frequency conversion; harmonic generation for high pulse energy, low repetition rate lasers; Electro-optical modulation; Q-switching crystal for Pockels cells.
Main features:
♦ No refracted light damage
♦ A high photodamage threshold
♦ High birefringence coefficient and superior electro-optic coefficient
♦ Compact design and easy adjustment
♦ Good environmental tolerance
Typical applications:
♦ High power laser frequency conversion material
♦ Electro-optic modulation, laser Q-switching
♦ Frequency doubling, tripling and quadrupling devices for Nd:YAG lasers
♦ Nd:YLF laser
Transparency curve of KDP&KD*P
Technical Parameters
Argument Name | Values and Ranges |
Size tolerance | ±0.1 mm |
Dimension tolerance | < ±0.2° |
Clear aperture | > 90% |
Surface quality | 20/10 |
Flatness | < λ/8@633nm |
Wavefront distortion | < λ/8@633nm |
Parallelism | < 20 arc sec |
Perpendicularity | < 5 arc min |
Coating | According to customer requirements |
Quality warranty period | 1 year (with normal use) |
Crystal Structure and Physical Properties
| Argument Name | KDP Value and Range | KD*P Value and Range |
Chemical formula | KH2PO4 | KD2PO4 |
Crystal parameters | a=b=7.4529, c=6.9751 | a=b=7.4697, c=6.9766 |
Density | 2.332 g/cm3 | 2.355 g/cm3 |
Mohs hardness | 2.5 | 2.5 |
Transmission range | 200 -1500 nm | 200 - 1600 nm |
Nonlinear coefficient | d36=0.44 pm/V | d36=0.40 pm/V |
Refractive index | no=1.4938，ne=1.4599 | no=1.4948，ne=1.4554 |
Electro-optical coefficient | r41=8.8 pm/V；r63=10.3 pm/V | r41=8.8 pm/V；r63=25 pm/V |
Longitudinal half-wave voltage | Vπ=7.65 KV (λ= 546 nm) | Vπ=2.98 KV (λ= 546 nm) |
Absorb | 0.07/cm | 0.006/cm |
Damage threshold | ＞5 GW/cm2 | ＞3 GW/cm2 |
Extinction ratio | 30 dB | 30 dB |
Sellmeier equation for KDP | ||
no2=2.259276 + 0.01008956/(λ2 - 0.012942625) + 13.00522λ2/(λ2 - 400) ne2=2.132668 + 0.008637494/(λ2 - 0.012281043) + 3.2279924λ2/(λ2 - 400) | ||
Sellmeier equation for KD*P | ||
no2=1.9575544 + 0.2901391λ2/(λ2 - 0.0281399) - 0.02824391λ2 + 0.004977826λ4 ne2=1.5005779 + 0.6276034λ2/(λ2 - 0.0131558) - 0.01054063λ2 + 0.002243821λ4 | ||
Standard Size
| Product No. | Size（mm） | θ（°） | Φ（°） | Coating | Application |
| KDP-1201 | 12 × 12 × 5 | 76.5 | 45 | AR/AR@532/266 nm | SHG@532 nm, Type 1 |
| KDP-1501 | 15 × 15 × 7 | 76.5 | 45 | AR/AR@532/266 nm | SHG@532 nm, Type 1 |
| Product No. | Size（mm） | θ（°） | Φ（°） | Coating | Application |
| DKDP-1501 | 15 × 15 × 13 | 36.5 | 45 | AR/AR@1064+532 nm | SHG@1064 nm, Type 1 |
| DKDP-1502 | 15 × 15 × 13 | 53.5 | - | AR/AR@1064+532 nm | SHG@1064 nm, Type 2 |
| DKDP-1201 | 12 × 12 × 20 | 53.5 | - | AR/AR@1064/1064+532 nm | SHG@1064 nm, Type 2 |
| DKDP-1503 | 15 × 15 × 20 | 53.5 | - | AR/AR@1064/1064+532 nm | SHG@1064 nm, Type 2 |
| DKDP-1202 | 12 × 12 × 20 | 59.3 | - | AR/AR@1064+532/355 nm | THG@1064 nm, Type 2 |
| DKDP-1504 | 15 × 15 × 20 | 59.3 | - | AR/AR@1064+532/355 nm | THG@1064 nm, Type 2 |
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