Properties of KDP, DKDP and ADP Crystal

Potassium Dihydrogen Phosphate, known as KDP crystal (KH2PO4), and its isomorphic crystals, deuterated KDP, known as KD*P or DKDP crystal (KD2PO4), Ammonium Dihydrogen Phosphate, known as ADP crystal (NH4H2PO4) are widely used in frequency doubling, frequency tripling and frequency quadrupling of Nd-doped laser systems, as well as the electro-optical modulators. DKDP is mainly used in Pockels Cells, and ADP is also used in Acousto-Optical devices.

Optical Properties:

Crystal		DKDP(KD*P)	KDP	ADP
Transmitting Range(nm):		200~2150	180~1550	180~1500
Absorption(%/cm):		0.5	3	-
Nonlinear Optical Coefficient (pm/V):		0.40	0.43	0.52
Damage Threshold: (GW/cm2 @1064nm)		5	5	6
Refractive Indices:	@1064nm	no=1.4931	no=1.4942	no=1.5071
		ne=1.4583	ne=1.4603	ne=1.4685
	@532nm	no=1.5074	no=1.5129	no=1.5280
		ne=1.4683	ne=1.4709	ne=1.4819
	@355nm	no=1.5257	no=1.5317	no=1.5487
		ne=1.4833	ne=1.4846	ne=1.4994
	@266nm	no=1.5539	no=1.5599	no=1.5797
		ne=1.5071	ne=1.5105	ne=1.5261
Sellmeier Equations: (l in µm)		N2 = A + B / (l2 - C) + Dl2/(l2- E)
A	no	2.2409	2.2576	2.3041
	ne	2.1260	2.1295	2.1643
B	no	0.0097	0.0101	0.0111
	ne	0.0086	0.0097	0.0097
C	no	0.0156	0.0142	0.0133
	ne	0.0120	0.0014	0.0129
D	no	2.2470	1.7623	15.1086
	ne	0.7844	0.7580	5.8057
E	no	126.9205	57.8984	400.0000
	ne	123.4032	127.0535	400.0000

Physical Properties:

Crystal	KD*P(DKDP)	KDP	ADP
Crystal Structure:	2m
Density(g/cm3):	2.355	2.332	1.799
Color:	Colorless
Hygroscopic Susceptibility	High
Thermal Conductivity(10-2W/cm·K):	k11=1.9;k33=2.1	-	-
Thermal Expansion Coefficients(10-5/K):	a11=1.9;a33=4.4	-	-

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