High-efficiency wide-band metal-dielectric resonant grating for 20 fs pulse compression

Abstract

More than 95% average efficiency TE-polarisation diffraction over a 200 nm wavelength range centred at 800 nm is obtained by a metal-dielectric grating structure with non-corrugated mirror. 98% maximum -1st order diffraction efficiency and a wide band top-hat spectrum are demonstrated experimentally opening the way to high-efficiency Chirped Pulse Amplification of femtosecond pulses as short as 20 fs.

Keywords

• femtosecond laser
• compression gratings
• leaky mode