Femto- and nano-second laser-induced damages in chalcogenide glasses

Abstract

We have studied damaging behaviors in bulk As2Se3, Se and As2S3 glasses using fs and ns laser pulses. Threshold fluence of laser damages markedly varies with excitations and materials. Under sub-gap fs pulses with photon-energy of ħω = 1.6 eV, the threshold in As2S3 is roughly twice that of the other two glasses, and photo-crystallization appears in Se. For ns pulses, all the glasses under bandgap (ħω = 2.3 eV) illumination possess higher thresholds than those under mid-gap (ħω = 1.2 eV) illumination. These observations are discussed, taking electronic and thermal effects into account.

Hierarchical Surface Structures and Large-Area Nanoscale Gratings in As2S3 and As2Se3 Films Irradiated with Femtosecond Laser Pulses

“…Presumably, modification of As 2 S 3 requires higher energies of laser pulses because the As–S chemical bonds are stronger than those of As–Se (260 and 230 kJ/mol, respectively) [ 43 ]. Typically, ablation threshold for As 2 Se 3 was reported to be almost twice less than for As 2 S 3 [ 44 , 45 ].…”

New Trends on Nonlinear Optics in Nanostructures and Plasmonics

“…The measured Raman spectra of detonation and HP-HT nanodiamond films show pronounced peaks with frequency shifts of 1329 and 1330 cm −1 , respectively (see Figure 2a). Taking into account the known dependences of the Raman shifts of carbon nanomaterials on the excitation wavelength [53] and the nanoparticle size [54], one can attribute these peaks to nanodiamonds (sp 3 -form of carbon). The decomposition of the spectra presented in Figure 2a shows that the full width at half maximum (FWHM) of diamond lines of HP-HT and detonation nanodiamonds are 8 and 22 cm −1 , respectively.…”

“…Thin CuSe/Se films with a thickness of 130 nm and dimensions of 15 35 mm were synthesized on a glass substrate by successive vacuum thermal deposition of Se and Cu, according to the procedure described in one of our previous publications [14]. To stabilize the residual Se [53,54], the synthesized film structure was annealed at a temperature of • for 30 min. As a result, the selenium from an unstable amorphous phase was into a stable polycrystalline trigonal selenium (t-Se).…”

Incident Angle Dependence of the Waveform of the Polarization-Sensitive Photoresponse in CuSe/Se Thin Film

“…Thin CuSe/Se films with a thickness of 130 nm and dimensions of 15 × 35 mm were synthesized on a glass substrate by successive vacuum thermal deposition of Se and Cu, according to the procedure described in one of our previous publications [14]. To stabilize the residual Se [53,54], the synthesized film structure was annealed at a temperature of 140 • C for 30 min. As a result, the selenium from an unstable amorphous phase was transformed into a stable polycrystalline trigonal selenium (t-Se).…”