Growth, structural and optical properties of 12%‐deuterated KDP crystals

Abstract

Key words 12%-DKDP, wideband second-harmonic generation, Raman shift, damage threshold, deuterium content.K(D 0.12 H 0.88 ) 2 PO 4 crystals were chosen to be used for quadratic nonlinear medium of wideband frequency doubling at 1 μm. A key limitation on this application is that little information can be found in the previous reports. In this work, growth as well as structural and optical properties of this crystal were investigated in detail. Experimental results in comparison with KDP indicate that lattice parameter along a-axis changes much more than lattice parameter c and infra-red absorption edge shift by 0.08 μm accompanied with increasing of transmittance in the whole region. With the introduction of deuterium atom, peak of ν 1 (PO4) shifts to lower wave number and transverse stimulated Raman scattering was effectively suppressed. Extra-ordinary and ordinary indices were also measured as function of wavelength. Good crystalline perfection and great performance of damage threshold also indicate that 12%-DKDP is an appropriate choice in the application of wideband frequency doubling at 1 μm.

Research on Nonlinear Absorption Effect in KDP and 70%-DKDP Crystals

“…This variation may be associated with the generation of D-O bonds. In the process of DKDP growth, H-O bonds are gradually replaced by D-O bonds with a relatively weaker bonding force [21,[23][24][25] (esu) have extremely favorable values. In contrast to previous results, such as dye-doped KDP (β = 141 cm/GW), KDP at λ = 216 nm (β = 6.0 ± 0.5 × 10 −10 cm/W), and L-lysine doped NH 4 H 2 PO 4 (ADP) (β = 4.063 × 10 −6 cm/W) [16,26,27], a lower nonlinear absorption coefficient is displayed for pure KDP and 70%-DKDP crystals, especially I-and II-type.…”

Nonlinear optical refraction characteristics of rapidly grown K(DxH1−x)2PO4crystals

“…However, the hydrogen bonds are gradually substituted by deuterium bonds with alterations in their crystal structure. This could impact the interaction between the phosphorus-oxygen tetrahedron and hydrogen or deuterium atoms, 31,32) particularly the bond strength. As a consequence, the behavior may further affect the nonlinear refraction to some extent.…”