Potassium Dideuterium Phosphate and its Isomorphs - KDP, KD*P (DKDP) Crystals
Applications: • Laser frequency conversion – harmonic generation for high pulse energy, low repetition (<100 Hz) rate lasers; • Electro-optical modulation; • Q-switching crystal for Pockels… Read more →
Volume discount
- 5–9 units −5%
- 10+ units −10%
Applied in your cart. Quantities of any variant of this product count together.
Listed in
Configure & order — pick a catalog variant or configure your own
Size, mm
Any
or
θ
Any
Coating
Any
or
Application
Any
or
φ
45
10
catalog variants — refine the spec to narrow it down.
| SKU | Size, mm · Coating · θ · Application · Group · φ | |
|---|---|---|
| DKDP-402 | 15x15x13·AR/AR@1064+532 nm·53.5·SHG@1064 nm, Type 2·DKDP Crystals |
Out of stock
Ships in: 62–65 calendar days
$1,029
|
| DKDP-403 | 12x12x20·AR/AR@1064+532/355 nm·59.3·THG@1064 nm, Type 2·DKDP Crystals |
Out of stock
Ships in: 62–65 calendar days
$959
|
| DKDP-405 | 15x15x20·AR/AR@1064/1064+532 nm·53.5·SHG@1064 nm, Type 2·DKDP Crystals |
Out of stock
Ships in: 62–65 calendar days
$1,098
|
| DKDP-406 | 15x15x20·AR/AR@1064+532/355 nm·59.3·THG@1064 nm, Type 2·DKDP Crystals |
3 in stock
Ships in: 2–5 calendar days
$1,098
|
| DKDP-409 | dia 9x20·uncoated*·-·Electro-Optical/Q-switching·- |
Out of stock
—
|
| DKDP-412 | dia 12x24·uncoated*·-·Electro-Optical/Q-switching·- |
Out of stock
—
|
| KDP-401 | 12x12x5·AR/AR@532/266 nm·76.5·SHG@532 nm, Type 1·KDP Crystals·45 |
2 in stock
Ships in: 2–5 calendar days
$567
|
| KDP-402 | 15x15x7·AR/AR@532/266 nm·76.5·SHG@532 nm, Type 1·KDP Crystals·45 |
4 in stock
Ships in: 2–5 calendar days
$590
|
| KRI0006058 | 14x14x0.65·P/P@400-800 nm·45·SHG@800 nm·45 |
Out of stock
—
|
| KRI0006060 | 14x14x0.45·P/P@400-800/265 nm·68.1·THG@800 nm·45 |
Out of stock
—
|
We can make this for you
No catalog variant matches your exact spec. Add it to your cart as a quote request — sales will confirm price and lead time within 1 business day.
Specifications
Physical and Optical Properties
| Crystals | KDP Crystal | DKDP Crystal |
|---|---|---|
| Chemical formula | KH₂PO₄ | KD₂PO₄ |
| Symmetry | 42 m | 42 m |
| Hygroscopicity | high | high |
| Density, g / cm³ | 2.332 | 2.355 |
| Thermal conductivity, W / cm×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 |
| Transmission range, μm | 0.18–1.5 | 0.2–2.0 |
| Residual absorption, cm-1 (at 1.06 μm) | 0.04 | 0.005 |
| Measured refractive index (at 1.06 μm) | no = 1.4938 / ne = 1.4599 | no = 1.4931 / ne = 1.4582 |
| Sellmeier coeff., λ – wavelength in μm | n²=A+Bλ² / (λ²-C)+D / (λ²-E) | n²=A+Bλ² / (λ²-C)+D / (λ²-E) |
| A no / ne | 2.259276 / 2.132668 | 2.2409 / 2.1260 |
| B no / ne | 13.00522 / 3.2279924 | 2.2470 / 0.7844 |
| C no / ne | 400 / 400 | 126.9205 / 123.4032 |
| D no / ne | 0.01008956 / 0.008637494 | 0.0097 / 0.0086 |
| E no / ne | 0.012942625 / 0.012281043 | 0.0156 / 0.0120 |
| Nonlinear coeff. d₃₆, pm / V (at 1.06 μm) | 0.43 | 0.40 |
| Effective nonlinear coefficient / Type 1 / Type 2 | dooe=d₃₆xsinθxsin2φ / deoe=d₃₆xsin2θxcos2φ | dooe=d₃₆xsinθxsin2φ / deoe=d₃₆xsin2θxcos2φ |
| Flatness | λ / 6 @ 633 nm |
| Parallelism | < 20 arcsec |
| Perpendicularity | < 5 arcmin |
| Angle tolerance | < 30 arcmin |
| Aperture tolerance | ± 0.1 mm |
| Surface quality | 20 / 10 scratch & dig per MIL-O-13830A |
| Clear aperture | 90% of full aperture |
Phase matching angle and bandwidths for SHG of 1064 nm — Acceptances for crystal of 1 cm length (FWHM):
| KDP | KDP | DKDP | DKDP | |
|---|---|---|---|---|
| Δθ (angular), mrad | 1.1 | 2.2 | 1.2 | 2.3 |
| ΔΤ thermal, K | 10 | 11.8 | 32.5 | 29.4 |
| Δλ spectral, nm | 21 | 4.5 | 6.6 | 4.2 |
| Walk off, mrad | 28 | 25 | 25 | 25 |
Phase matching angle and bandwidths for SHG of 1064 nm
| KDP | KDP | DKDP | DKDP | |
|---|---|---|---|---|
| Type of phase matching | Type 1 / ooe | Type 2 / eoe | Type 1 / ooe | Type 2 / eoe |
| Cut angle θ, deg | 41.2 | 59.1 | 36.6 | 53.7 |
Description
Applications:
- Laser frequency conversion – harmonic generation for high pulse energy, low repetition (<100 Hz) rate lasers;
- Electro-optical modulation;
- Q-switching crystal for Pockels cells;
Electro-Optical/Q-switching applications:
- highly deuterated D>96% electro-optic (e/o) crystal - DKDP for Q-switching application;
- Standard dimensions of electro-optic (e/o) DKDP crystals for Q-switching are cylinders dia 9 x 20 mm and dia 12 x 24 mm however manufacturing of custom size and rectangular shape crystals is available;
- Gold evaporated or silver paste electrodes are available; Dielectric thin film AR coatings for specified laser wavelengths are available;
- Typical quarter wave voltage 3.4 kV at 1064 nm; Typical contrast ratio between crossed polarizers better than 1:2000;
- Damage threshold of AR coated DKDP surface >5 J/cm2 at 1064 nm, 10 ns pulses.
Frequency conversion applications:
- DKDP crystals are used for second harmonic generation of high pulse energy low repetition rate (<100Hz) Q-switched and mode-locked Nd:YAG lasers. Cut angle of crystal for operation at room temperature is 36.6 deg for Type 1 phase matching and 53.7 deg for Type 2 phase matching.
- DKDP crystals are used for third harmonic generation of high pulse energy Q-switched and mode-locked Nd:YAG lasers via sum frequency generation. Cut angle of crystal for operation at room temperature is 59.3 deg for Type 2 phase matching.
- Type 1 DKDP crystals with non-critical cut angle theta=90 deg are used for fourth harmonic generation (532nm → 266nm) of high pulse energy Q-switched and mode-locked Nd:YAG lasers. Crystal must be heated at ~50 deg C temperature to match NCPM conditions.
- Type 1 KDP crystal with close to non-critical cut angle theta=76.5 deg is used for fourth harmonic generation (532nm → 266nm) of high pulse energy Q-switched and mode-locked Nd:YAG lasers. KDP crystal has lower absorption at UV wavelengths comparing to DKDP.
- KDP thin crystals are used for second harmonic generation of Ti:Sapphire laser radiation or pulse duration measurement in single shot autocorrelators. KDP possesses ~2.4 times larger spectral acceptance and correspondingly smaller group velocity mismatch comparing to BBO crystal for SHG of 800 nm, what sometime is very critical parameter for femtosecond wide spectrum pulses.
- KDP crystals can be supplied by Eksma Optics of aperture up to dia 80 mm. Actually KDP remains the only solution for harmonic generation of very high intensity femtosecond Ti:Sapphire lasers featuring sub-tera Watt or tera Watt peak power pulses in large >30 mm diameter beams.
