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Home » Products » NLO Crystal » KDP, KD*P Crystal
KDP, KD*P Crystal

KDP, KD*P Crystal

KDP and KD*P are among the most widely-used commercial NLO materials, characterized by good UV transmission, high damage threshold, and high birefringence. 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.

Applications:
1. Second, third, and fourth harmonic generation of Nd:lasers.
2. Frequency doubling of dyer laser
3. High power laser frequency conversion materials
4. Shutter for high speed photography
5. Electro-optical modulator and Q switches
Baisc properties:

Chemical Formula KDP (KH2PO4) KD*P (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)
Absorptance: 0.07/cm 0.006/cm
Optical damage threshold: >5 GW/cm2 >3 GW/cm2
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
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