KDP, DKDP (KD*P) Crystals - Potassium Dideuterium Phosphate & Isomorphs

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DKDP Crystals

Code	Size, mm	θ	φ	Coating	Application	Price	Delivery	Add to cart
DKDP-401	15x15x13	36.5	45	AR/AR@1064+532 nm	SHG@1064 nm, Type 1	979 $	4 - 5 days
DKDP-402	15x15x13	53.5	-	AR/AR@1064+532 nm	SHG@1064 nm, Type 2	979 $	Request
DKDP-403	12x12x20	59.3	-	AR/AR@1064+532/355 nm	THG@1064 nm, Type 2	913 $	Request
DKDP-404	12x12x20	53.5	-	AR/AR@1064/1064+532 nm	SHG@1064 nm, Type 2	913 $	Request
DKDP-405	15x15x20	53.5	-	AR/AR@1064/1064+532 nm	SHG@1064 nm, Type 2	1045 $	Request
DKDP-406	15x15x20	59.3	-	AR/AR@1064+532/355 nm	THG@1064 nm, Type 2	1045 $	4 - 5 days

KDP Crystals

Code	Size, mm	θ	φ	Coating	Application	Price	Delivery	Add to cart
KDP-401	12x12x5	76.5	45	AR/AR@532/266 nm	SHG@532 nm, Type 1	539 $	4 - 5 days
KDP-402	15x15x7	76.5	45	AR/AR@532/266 nm	SHG@532 nm, Type 1	561 $	4 - 5 days

Flatness	λ/6 @ 633 nm
Parallelism	< 20 arcsec
Perpendicularity	< 5 arcmin
Angle tolerance	< 30 arcmin
Aperture tolerance	± 0.1 mm
Surface quality	20/10 scratch & dig per MIL-O-13830A
Clear aperture	90% of full aperture

Physical and Optical Properties

Crystals	KDP Crystal	DKDP Crystal
Chemical formula	KH₂PO₄	KD₂PO₄
Symmetry	42 m	42 m
Hygroscopicity	high	high
Density, g/cm³	2.332	2.355
Thermal conductivity, W/cm×K	k₁₁= 1.9×10^-2	k₁₁= 1.9×10^-2 k₃₃= 2.1×10^-2
Thermal expansion coefficients, K^-1	a₁₁= 2.5×10^-5 a₃₃= 4.4×10^-5	a₁₁= 1.9×10^-5 a₃₃= 4.4×10^-5
Transmission range, μm	0.18–1.5	0.2–2.0
Residual absorption, cm-1 (at 1.06 μm)	0.04	0.005
Measured refractive index (at 1.06 μm)	n_o = 1.4938 n_e = 1.4599	n_o = 1.4931 n_e = 1.4582
Sellmeier coeff., λ – wavelength in μm	n²=A+Bλ²/(λ²-C)+D/(λ²-E)
A n_o n_e	2.259276 2.132668	2.2409 2.1260
B n_o n_e	13.00522 3.2279924	2.2470 0.7844
C n_o n_e	400 400	126.9205 123.4032
D n_o n_e	0.01008956 0.008637494	0.0097 0.0086
E n_o n_e	0.012942625 0.012281043	0.0156 0.0120
Nonlinear coeff. d₃₆, pm/V (at 1.06 μm)	0.43	0.40
Effective nonlinear coefficient Type 1 Type 2	d_ooe=d₃₆xsinθxsin2φ d_eoe=d₃₆xsin2θxcos2φ

Phase matching angle and bandwidths for SHG of 1064 nm

	KDP		DKDP
Type of phase matching	Type 1 ooe	Type 2 eoe	Type 1 ooe	Type 2 eoe
Cut angle θ, deg	41.2	59.1	36.6	53.7
Acceptances for crystal of 1 cm length (FWHM):
Δθ (angular), mrad	1.1	2.2	1.2	2.3
ΔΤ thermal, K	10	11.8	32.5	29.4
Δλ spectral, nm	21	4.5	6.6	4.2
Walk off, mrad	28	25	25	25

EKSMA Optics KDP and DKDP Crystals
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Applications:

Laser frequency conversion – harmonic generation for high pulse energy, low repetition (<100 Hz) rate lasers;
Electro-optical modulation;
Q-switching crystal for Pockels cells;

Electro-Optical/Q-switching applications:

highly deuterated D>96% electro-optic (e/o) crystal - DKDP for Q-switching application;
Standard dimensions of electro-optic (e/o) DKDP crystals for Q-switching are cylinders dia 9 x 20 mm and dia 12 x 24 mm however manufacturing of custom size and rectangular shape crystals is available;
Gold evaporated or silver paste electrodes are available; Dielectric thin film AR coatings for specified laser wavelengths are available;
Typical quarter wave voltage 3.4 kV at 1064 nm; Typical contrast ratio between crossed polarizers better than 1:2000;
Damage threshold of AR coated DKDP surface >5 J/cm2 at 1064 nm, 10 ns pulses.

Frequency conversion applications:

DKDP crystals are used for second harmonic generation of high pulse energy low repetition rate (<100Hz) Q-switched and mode-locked Nd:YAG lasers. Cut angle of crystal for operation at room temperature is 36.6 deg for Type 1 phase matching and 53.7 deg for Type 2 phase matching.
DKDP crystals are used for third harmonic generation of high pulse energy Q-switched and mode-locked Nd:YAG lasers via sum frequency generation. Cut angle of crystal for operation at room temperature is 59.3 deg for Type 2 phase matching.
Type 1 DKDP crystals with non-critical cut angle theta=90 deg are used for fourth harmonic generation (532nm → 266nm) of high pulse energy Q-switched and mode-locked Nd:YAG lasers. Crystal must be heated at ~50 deg C temperature to match NCPM conditions.
Type 1 KDP crystal with close to non-critical cut angle theta=76.5 deg is used for fourth harmonic generation (532nm → 266nm) of high pulse energy Q-switched and mode-locked Nd:YAG lasers. KDP crystal 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 duration measurement in single shot autocorrelators. KDP possesses ~2.4 times larger spectral acceptance and correspondingly smaller group velocity mismatch comparing to BBO crystal for SHG of 800 nm, what sometime is very critical parameter for femtosecond wide spectrum pulses.
KDP crystals can be supplied by EKSMA OPTICS of aperture up to dia 80 mm. Actually KDP remains the only solution for harmonic generation of very high intensity femtosecond Ti:Sapphire lasers featuring sub-tera Watt or tera Watt peak power pulses in large >30 mm diameter beams.

Potassium Dideuterium Phosphate and its Isomorphs - KDP, KD*P (DKDP) Crystals

Potassium Dideuterium Phosphate and its Isomorphs - KDP, KD*P (DKDP) Crystals

Potassium Dideuterium Phosphate and its Isomorphs - KDP, KD*P (DKDP) Crystals

Potassium Dideuterium Phosphate and its Isomorphs - KDP, KD*P (DKDP) Crystals

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