Second harmonic generation in selenium-copper structures

Optical second harmonic generation (SHG) observations and precise X-ray diffraction experiments have been performed on selenium-copper film structures. Selenium-copper structures were obtained by successive thermal evaporation of selenium and ion evaporation of copper onto the glass substrate in vacuum. To determine what compounds have emerged and if the material is crystalline x-ray diffraction (XRD) analysis was performed. The SHG experiment was performed by confocal microscope where the femtosecond radiation from femtosecond laser (180 fs, 80 MHz) was injected. Second harmonic intensity dependence on wavelength of the exciting radiation and on thickness of Cu layer was observed. We found out that adding small amount of Cu increases reflected SH intensity.