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KDP
& KD*P
Potassium
Dihydrogen Phosphate (KDP) and
Potassium Dideuterium Phosphate (KD*P
) are among the most widely-used
commercial NLO materials,
characterized by good UV transmission,
high damage threshold, and high
birefringence, though their NLO
coefficients are relatively low. They
are usually used for doubling,
tripling and quadrupling of a 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,
such as Q-switches, Pockels Cells,
etc.
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AOTK
supplies high quality KDP and KD*P crystals in
large quantities for these applications.
Because their polished surfaces are easier to
be moistened, however, the user is advised to
provide a dry condition (<50%) and the
sealed housing for preservation. For this
purpose, AOTK also provides polishing and
sealed housing services for the KDP family
crystals. Our engineers will serve you to
select and design the best crystal, according
to the laser parameters you provide.
Applications
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Second, third, and fourth harmonic
generation of Nd:lasers
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Frequency doubling of dyer laser
●
High power laser frequency conversion
materials
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Shutter for high speed photography
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Electro-optical modulator and Q
switches
Basic Properties
Sructural and Physical Properties
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KDP
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KD*P
(DKDP)
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Chemical
Formula
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KH2PO4
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KD2PO4
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Crystal
Structure
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Tetragonal
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Tetragonal
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Transmission
Range
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200-1500nm
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200-1600nm
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Nonlinear
Coefficients
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d36=0.44pm/V
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d36=0.40pm/V
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Refractive
Indexes
(at 1064nm)
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no
= 1.4938
ne
= 1.4599
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no
= 1.4948
ne
= 1.4554
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Electro-Optical
Coefficients
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r41=8.8pm/V
r63=10.3pm/V
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r41=8.8pm/V
r63=25pm/V
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Longitudinal
Half-Wave Voltage
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Vp=7.65KV
(λ
=546nm)
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Vp=2.98KV
(λ
=546nm)
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Absorption
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0.07/cm
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0.006/cm
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Temperature
Synchronism Width
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11.5
oC*cm
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7.4
oC*cm
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Spectral
Synchronism Width
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106
Å*cm
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32
Å*cm
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Angle
Synchronism Width
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0.84
mrad*cm
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0.94
mrad*cm
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Absorption
Coefficient, cm-1
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0.07
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0.006
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Sellmeier Equations
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KDP
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no2
= 2.259276 + 0.01008956/(λ2
- 0.012942625) + 13.005522λ2/(λ2
- 400)
ne2
= 2.132668 + 0.008637494/(λ2
- 0.012281043) + 3.2279924λ2/(λ2
- 400)
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KD*P
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no2
= 1.9575544 + 0.2901391/(λ2
- 0.0281399) - 0.02824391λ2
+0.004977826λ4
ne2
= 1.5005779 + 0.6276034/(λ2
- 0.0131558) - 0.01054063λ2
+0.002243821λ4
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Specifications
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Dimensional
Tolerance
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(W
±
0.1mm) x (H ±
0.1mm) x (L +0.2/-0.1 mm)
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Angle
Tolerance
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Δθ
< ±
0.2°,
ΔΦ < ±
0.2°
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Flatness
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λ/8
@633 nm
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Surface
Quality
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10/5
Scratch/Dig per MIL-O-13830A
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Parallelism
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<
20
arc seconds
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Perpendicularity
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<
5 arc minutes
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Clear
Aperture
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>
90% central area
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Quality
Warranty Period
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one
year under proper use
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Dimensional
Tolerance
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(W
±
0.1mm) x (H ±
0.1mm) x (L +0.2/-0.1 mm)
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Note
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KDP and KD*P is highly hygroscopic and
the coating can Not be available.Please keep
it in a
dry environment, and
sealed housing is recommended.
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The LiIO3 crystals is
available too.
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