Extreme ultraviolet light from a tin plasma driven by a 2-µm-wavelength laser

An experimental study of laser-produced plasmas is performed by irradiating a planar tin target laser pulses, 4.8 ns duration, produced from KTP-based 2-µm-wavelength master oscillator power amplifier. Comparative spectroscopic investigations are for driven 1-µm- and pulsed lasers, over wide range intensities spanning 0.5 ? 5 × 10 11 W/cm 2 . Similar extreme ultraviolet (EUV) spectra in the 5.5–25.5 nm wavelength underlying plasma ionicities obtained when intensity ratio kept fixed at I 1µm / 2µm = 2.4(7). Crucially, conversion efficiency (CE) 2-µm-laser energy into radiation within 2% bandwidth centered 13.5 relevant industrial applications found to be factor two larger, 60 degree observation angle, than case denser 1-µm-laser-driven plasma. Our findings regarding scaling optimum efficient EUV generation CE with drive extended other wavelengths using available literature data.