NLO Crystals
Laser Crystals
Electro-optics crystals
  DKDP
  LGS
Optical Components

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

KDP and DKDP/KD*P
Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (KD*P) are excellent crystals for E-O modulators, Q-switches; second, third and fourth harmonic generation for Nd:YAG laser; double frequency for dye laser.
Basic Properties

Basic Properties

 

KDP

KD*P

Chemical Formula

KH2PO4

KD2PO4

Transparency Range

200-1500nm

200-1600nm

Nonlinear Coefficients

d36=0.44pm/V

d36=0.40pm/V

Refractive index (at 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)

Absorption

0.07/cm

0.006/cm

Optical damage threshold

>5 GW/cm2

>3 GW/cm2

Extinction ratio

 

30dB

Sellmeier equations of KDP(λ in um)

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 DKDP(λ in um)

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

Advantages

  1. Good UV transmission
  2. High optical damage threshold
  3. High birefringence
  4. High nonlinear coefficients

Applications

  1. Electro-optical modulator, Q-switches
  2. Second, third and fourth harmonic generation, double frequency for dye laser
  3. Shutter for high speed photography
  4. High power laser frequency conversion materials
Specification of Sino-crystal's KDP/DKDP

Dimension tolerance

W(±0.1)×H((±0.1)×L(+0.2/-0.1) mm

Flatness

λ/8 @633nm

Surface quality( Scratch/Dig)

20/10

Parallelism

better than 20 arc seconds

Perpendicularity

better than 0.25°

Angle tolerance

< +/-0.3°

Clear aperture

>90% central area

Quality Warranty Period

one year under proper use