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A series of MnxZn1-xO (x=0.03, 0.05) nanostructures have been grown via thesolution based chemical spray pyrolysis technique. Electron beam inducedmodifications on structural, linear and nonlinear optical and surfacemorphological properties have been studied and elaborated. GXRD (glancing angleX-ray diffraction) patterns show sharp diffraction peaks matching with thehexagonal wurtzite structure of ZnO thin films. The upsurge in ebeam dosageresulted in the shifting of XRD peaks (101) and (002) towards lower angle side,and increase in FWHM value. Gaussian deconvolution on PL spectra reveals thequenching of defect centers, implying the role of electron beam irradiationregulating luminescence and defect centers in the nanostructures. Irradiationinduced spatial confinement and phonon localization effects have been observedin the films via micro Raman studies. The later are evident from spectral peakshifts and broadening. Detailed investigations on the effect of electron beamirradiation on third order nonlinear optical properties under continuous andpulsed mode of laser operation regimes are deliberated. Third order absorptivenonlinearity of the nanostructures evaluated using the open aperture Z-scantechnique in both continuous and pulsed laser regimes shows strong nonlinearabsorption coefficient \b{eta} eff of the order 10-4 cm/W confirming theirsuitability for passive optical limiting applications under intense radiationenvironments. Laser induced third harmonic generation (LITHG) experimentresults supports the significant variation in nonlinearities upon electron beamirradiation, and the effect can be utilized for frequency conversion mechanismsin high power laser sources and UV light emitters.

Methodical engineering of defects in Mn$_x$Zn$_{1-x}$ O($x$ = 0.03, and  0.05) nanostructures by electron beam for nonlinear optical applications: A  new insight