Well-designed Er:Glass - KDP & DKDP Crystal – WISOPTIC
Well-designed Er:Glass - KDP & DKDP Crystal – WISOPTIC Detail:
KDP (KH2PO4 ) and DKDP/KD*P (KD2PO4 ) are among the most widely-used commercial NLO materials. With good UV transmission, high damage threshold, and high birefringence, these material are usually used for doubling, tripling and quadrupling of Nd:YAG laser.
With high E-O coefficient, KDP and DKDP crystals are also widely used to make Pockels cells for laser system, such as Nd:YAG, Nd:YLF, Ti-Sapphire, Alexandrite, etc. Even though DKDP with high deuteration is more commonly used, KDP and DKDP both can do phase matching of type I and type II for the SHG and THG of 1064nm Nd:YAG laser. We recommend KDP for FGH of Nd:YAG laser (266nm).
As one of the major KDP/DKDP suppliers (source manufacturer) in the whole international market, WISOPTIC has high capability of material selection, processing (polishing, coating, gold-plating, etc). WISOPTIC confirms reasonable price, mass production, quick delivery and long guarantee period of these materials.
Contact us for the best solution for your application of KDP/DKDP crystals.
WISOPTIC Advantages - KDP/DKDP
• High deuteration ratio (>98.0%)
• High homogeneity
• Excellent internal quality
• Top finish quality with high processing precision
• Large block for various size and shapes
• Very competitive price
• Mass production, quick delivery
WISOPTIC Standard Specifications* - KDP/DKDP
| Deuteration Ratio | > 98.00% |
| Dimension Tolerance | ± 0.1 mm |
| Angle Tolerance | ≤ ± 0.25° |
| Flatness | < λ/8 @ 632.8 nm |
| Surface Quality | < 20/10 [S/D] (MIL-PRF-13830B) |
| Parallelism | < 20” |
| Perpendicularity | ≤ 5′ |
| Chamfer | ≤ 0.2mm @ 45° |
| Transmitted Wavefront Distortion | < λ/8 @ 632.8 nm |
| Clear Aperture | > 90% of central area |
| Laser Damage Threshold | > 500 MW for 1064nm, TEM00, 10ns, 10Hz (AR-coated) > 300 MW for 532nm, TEM00, 10ns, 10Hz (AR-coated) |
| * Products with special requirement upon request. | |
DOWNLOAD Technical Data – KDP & DKDP
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Main Features - KDP/DKDP
• Good UV transmission
• High optical damage threshold
• High birefringence
• High nonlinear coefficients
Primary Applications – KDP/DKDP
• Laser frequency conversion – Second, third, and fourth harmonic generation for high pulse energy, low repetition (<100 Hz) rate lasers
• Electro-optical modulation
• Q-switching crystal for Pockels cells
Physical Properties – KDP/DKDP
| Crystal | KDP | DKDP |
| Chemical formula | KH2PO4 | KD2PO4 |
| Crystal structure | I42d | I42d |
| Space group | Tetragonal | Tetragonal |
| Point group | 42m | 42m |
| Lattice constants | a=7.448 Å, c=6.977 Å | a=7.470 Å, c=6.977 Å |
| Density | 2.332 g/cm3 | 2.355 g/cm3 |
| Mohs hardness | 2.5 | 2.5 |
| Melting point | 253 °C | 253 °C |
| Curie temperature | -150 °C | -50 °C |
| Thermal conductivity [W/(m·K)] | k11= 1.9×10-2 | k11= 1.9×10-2, k33= 2.1×10-2 |
| Thermal expansion coefficients (K-1) | a11= 2.5×10-5, a33= 4.4×10-5 | a11= 1.9×10-5, a33= 4.4×10-5 |
| Hygroscopicity | high | high |
Optical Properties – KDP/DKDP
| Crystal | KDP | DKDP |
| Transparency region (at “0” transmittance level) |
176-1400 nm | 200-1800 nm |
| Linear absorption coefficients (@ 1064 nm) |
0.04 /cm | 0.005 /cm |
| Refractive indices (@1064 nm) | no=1.4938, ne=1.4601 | no=1.5066, ne=1.4681 |
| NLO coefficients (@1064 nm) | d36=0.39 pm/V | d36=0.37 pm/V |
| Electro-optic coefficients | r41=8.8 pm/V, r63=10.3 pm/V |
r41=8.8 pm/V, r63=25 pm/V |
| Longitudinal half-wave voltage | 7.65 kV (λ=546 nm) | 2.98 kV (λ=546 nm) |
| SHG conversion efficiency | 20~30% | 40~70% |
Phase matching angle for SHG of 1064 nm
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KDP |
DKDP |
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| Type of phase matching | Type 1 ooe | Type 2 eoe | Type 1 ooe | Type 2 eoe |
| Cut angle θ | 41.2° | 59.1° | 36.6° | 53.7° |
| Acceptances for crystal of 1 cm length (FWHM): | ||||
| Δθ (angle) | 1.1 mrad | 2.2 mrad | 1.2 mrad | 2.3 mrad |
| ΔΤ (thermal) | 10 K | 11.8 K | 32.5 K | 29.4 K |
| Δλ (spectral) | 21 nm | 4.5 nm | 6.6 nm | 4.2 nm |
| Walk-off angle | 28 mrad | 25 mrad | 25 mrad | 25 mrad |
Product detail pictures:
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High-quality comes 1st; assistance is foremost; business enterprise is cooperation" is our business enterprise philosophy which is constantly observed and pursued by our business for Well-designed Er:Glass - KDP & DKDP Crystal – WISOPTIC, The product will supply to all over the world, such as: Iran, Las Vegas, Kyrgyzstan, we rely on own advantages to build a mutual-benefit commerce mechanism with our cooperative partners. As a result, now we have gained a global sales network reaching the Middle East, Turkey, Malaysia and Vietnamese.
By Christine from Spain - 2018.06.30 17:29
Company director has very rich management experience and strict attitude, sales staff are warm and cheerful, technical staff are professional and responsible,so we have no worry about product,a nice manufacturer.
By Nicci Hackner from Germany - 2018.12.14 15:26
