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kdp crystals
kdp crystals

KDP/DKDP Laser Nonlinear Crystals

Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (DKDP, KD*P) are among the most widely-used commercial NLO materials. They are commonly used for doubling, tripling and quadrupling of Nd:YAG laser at the room temperature. In addition, they are also excellent electro-optic crystals with high electro-optic coefficients, widely used as electro-optical modulators, Q-switches, and Pockels Cells, etc.

Main Applications of KDP DKDP Laser Nonlinear Crystals


  • Laser frequency conversion — harmonic generation for high pulse energy

  • Electro-optical modulation

  • Q-switching crystal for Pockels cells


Advantages of KDP DKDP Laser Nonlinear Crystals


  • Good UV transmission

  • High birefringence

  • High optical damage threshold

  • High nonlinear coefficients

  • Non-hygroscopic, chemically and mechanically stable

  • Wide working temperature range

  • Low capacitance


Specifications of KDP DKDP Laser Nonlinear Crystals


Tolerance of cutting angle

△θ≤±0.25°,△φ≤±0.25°

Tolerance of dimension

Dimension+0/-0.1 mm,L:±0.1mm

Flatness

λ/10 @ 632.8nm

Wavefront distortion

λ/8@ 632.8nm

Surface quality

10/5 per MIL-O-13830A

Parallelism

20″

Perpendicularity

10′

Clear Aperture:

> 90%

Chamfer:

< 0.1 mm @ 45°

Size

Upon customer request

Coating

AR/HR coating upon customer’s request

Damage Threshold

750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz

Quality Warranty Period

One year under proper use


Properties of KDP DKDP Laser Nonlinear Crystals



KDP

DKDP / KD*P

Chemical Formula

KH2PO4

KD2PO4

Transparency Range

200-1500nm

200-1600nm

Nonlinear Coefficients

d36=0.44pm/V

d36=0.40pm/V

Refractive index (@1064nm)

no=1.4938,ne=1.4599

no=1.4948,ne=1.4554

Electro-optical Coefficients

r41=8.8pm/V

r63=10.3pm/V

r41=8.8pm/V

r63=25pm/V

Longitudinal half-wave voltage

Vπ=7.65KV(λ=546nm)

Vπ=2.98KV(λ=546nm)

Absorptance

0.07/cm

0.006/cm

Optical damage threshold

>5GW/cm2

>3GW/cm2

Extinction ratio


30dB

Sellmeier equations of KDP (λ in μm)

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 equations of KD*P (λ in μm)

no²=1.9575544+0.2901391λ²/(λ²-0.0281399)-0.02824391λ²+0.004977826λ4
ne²=1.5005779+0.6276034λ²/(λ²-0.0131558)-0.01054063λ²+0.002243821λ4


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Head Office: No. 66, 8 Group, Chengbei Village, Yanguan Town, Jiaxing 314411, China;

Hangzhou Branch: Room 1012, Chunhua Bussiness Center, No. 159, Hangbo Street, Shangcheng District, Hangzhou 310009, Zhejiang, China
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