Light-induced absorption and optical damage in Sc-, Mg-, and Zn-doped near-stoichiometric LiNbO₃

Abstract

By measuring the ultraviolet-light-induced absorption in Sc-, Mg- and Zn-doped near-stoichiometric lithium niobate (LiNbO[Formula: see text], we find that the steady-state ultraviolet-light-induced absorption coefficient changes with respect to the doping concentration. There is a strong ultraviolet-light-induced absorption when doping concentration is below its photorefractive threshold and a really weak absorption when the crystal is highly doped. We also use OH[Formula: see text] infrared absorption spectra and the transmitted light spot distortion method to verify the result. Thus, we can determine if the doping level in these doped near-stoichiometric LiNbO3 crystals is above or below their photorefractive threshold by measuring the ultraviolet-light-induced absorption.

Self‐Powered Lithium Niobate Thin‐Film Photodetectors

“…Such current flow profile can be attributed to the photo-thermoelectric and photovoltaic effect originating from built-in electric field of polarized LiNbO 3 . [26,27] However, no photoresponse is observed in any case (by applying bias or adjusting wavelengths) for intrinsic LNOI structure without Ag ion implantation using the same electrode patterns coated scheme (see Figure 2f) due to the low optical absorption and electrical conductivity of intrinsic LNOI at room temperature, [28] which powerfully demonstrates that the Ag ion implantation plays a critical role in the LNOI photodetector. It should be noted that the photocurrent value along negative-direction is approximately three times higher than that along the positive-direction for Ag:LNOI photodetector, as shown in Figure 2g-i behavior.…”

Effect of Zirconium Content on Defect Structure and Light Damage Resistance of Zr:Dy:LiNbO3 Crystals

“…[ 8 ] However, when lithium niobate crystal material is irradiated by a higher intensity laser, the refractive index of the crystal will change unevenly, and this inhomogeneity will be serious with the increase of light intensity, which is called photodamage. [ 9,10 ] The photodamage of materials greatly limits their application in heavy fields. Lithium niobate crystal is a non‐stoichiometric crystal with inherent defects in lithium niobate crystals (anti‐niobium ($$N{b}_{\textit{Li}}^{4+}$$) and lithium vacancies ($${V}_{\textit{Li}}^{-}$$)), which can be compensated for by doping cations such as rare earth ions and photodamage‐resistant ions.…”

Photoinduced absorption and linear/nonlinear emission of assembled carbon dot–silica nanocomposites for cellular imaging

“…The PIA has also been proved to be effective in determining the damage threshold. 27 Due to these obvious advantages of nonlinear optical property and PIA property, it deserves more attention to develop nanomaterials with these two typical properties.…”