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KDP (

cap K cap H sub 2 cap P cap O sub 4

) and its deuterated counterpart, DKDP (

cap K cap D sub 2 cap P cap O sub 4

), are premium, widely used, and cost-effective nonlinear optical crystals for Pockels cells and electro-optic Q-switches in high-power lasers, such as Nd:YAG. They offer high damage thresholds, large birefringence, and excellent UV transmission, with DKDP often preferred for its lower absorption and high deuteration (>98%).

High Damage Threshold: Ideal for high-power, high-repetition-rate laser systems (e.g., Q-switched and mode-locked lasers).
Electro-optic Effects: They possess strong electro-optic (
$r sub 63$
) coefficients, allowing for effective Q-switching.
Hygroscopic Nature: Both materials are sensitive to moisture, requiring careful handling and sealed housing for long-term stability.
Wavelength Range: High transparency from UV to NIR (
).

DKDP (KD*P) Crystal Properties - Shape Optics Technologies
Description: Potassium Dideuterium Phosphate (DKDP or KD*P) crystals are well-known for their low optical loss, high extinction ra...
Shape Optics Technologies
Non-linear crystal, KDP/DKDP crystals - zokoptics
DKDP & KDP Crystal - NLO Crystal - SAM
Q3 How are DKDP and KDP crystals used in Q-switching? In Q-switching, DKDP and KDP crystals function as electro-optic modulators t...
Stanford Advanced Materials

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KDP and DKDP for electro optical Q switch - Hgoptronics.com

hgoptronics.com

https://www.hgoptronics.com › kdp-and-dkdp-for-elect...

hgoptronics.com

https://www.hgoptronics.com › kdp-and-dkdp-for-elect...

They are usually used for doubling, tripling and quadrupling of a Nd:YAG laser under the room temperature. In addition, they are also excellent electro-optic ...Read more

Electro-Optical/Q-switching application

EKSMA Optics

https://eksmaoptics.com › out › media › EKSMA_...

EKSMA Optics

https://eksmaoptics.com › out › media › EKSMA_...

PDF

KDP has lower absorption at UV wavelengths comparing to DKDP. KDP thin crystals are used for second harmonic generation of Ti:Sapphire laser radiation or pulse ...Read more

2 pages

Guide to the KD*P Q-Switch

IL Photonics

https://ilphotonics.com › guide-to-the-kdp-q-switch

IL Photonics

https://ilphotonics.com › guide-to-the-kdp-q-switch

Jan 13, 2025 — The KD*P Q-switch works by utilizing the properties of the potassium dihydrogen phosphate crystal. When a laser beam passes through this crystal ...Read more

OST Photonics KDP Crystals/DKDP Laser Nonlinear Crystals

Jiaxing AOSITE Photonics Technology Co.,Ltd.

https://www.ostphotonics.com › ... › Nonlinear Crystals

Jiaxing AOSITE Photonics Technology Co.,Ltd.

https://www.ostphotonics.com › ... › Nonlinear Crystals

KDP crystals and DKDP crystals are commonly used for doubling, tripling and quadrupling of Nd:YAG laser at the room temperature. In addition, KDP crystals and ...Read more

KDP/DKDP Crystals & Applications

OptoCity

https://www.optocity.com › KDP

OptoCity

https://www.optocity.com › KDP

The main advantage of DKDP is its higher electro-optic coefficients. It is widely used as electro-optical modulators, Q-switches and Pockels Cells. KDP and ...Read more

KDP Pockels Cell for Laser Q-Switching and Modulation

FindLight

https://www.findlight.net › ... › Electro-Optics › EOM

FindLight

https://www.findlight.net › ... › Electro-Optics › EOM

The KD*P Pockels Cell is a state-of-the-art electro-optical device crafted from Potassium Dideuterium Phosphate (K(H1−xDx)2PO4), commonly known as KD*P crystal.Read more

6-day delivery30-day returns

DKDP Crystal: "Brilliant and Enduring" - Castech

castech.com

https://www.castech.com › news_detail

castech.com

https://www.castech.com › news_detail

Nov 19, 2025 — Owing to its exceptional performance, DKDP crystals are widely used in intracavity Q-switching, high-speed optical shutters, pulse picking, and ...Read more

KDP/KD*P Crystals

Newlight Photonics Inc.

https://www.newlightphotonics.com › KDP-DKDP-Crystals

Newlight Photonics Inc.

https://www.newlightphotonics.com › KDP-DKDP-Crystals

KDP (Potassium Dihydrogen Phosphate) and KD*P (Potassium Dideuterium Phosphate) are useful commercial NLO materials for doubling, tripling and quadrupling of ...Read more

Potassium Dihydrogen Phosphate Crystals (KDP)

G&H photonics

https://gandh.com › crystals-and-nonlinear-optics › pot...

G&H photonics

https://gandh.com › crystals-and-nonlinear-optics › pot...

G&H Potassium Dihydrogen Phosphate (KDP) crystals and boules excellent electro-optic and nonlinear optical properties for Pulse Picking, Q-switching, ...

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