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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 |
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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
- Good UV transmission
- High optical damage threshold
- High birefringence
- High nonlinear coefficients
Applications
- Electro-optical modulator, Q-switches
- Second, third and fourth harmonic generation, double frequency for dye laser
- Shutter for high speed photography
- High power laser frequency conversion materials
Specification of Sino-crystal's KDP/DKDP
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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 |
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