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.
Highlights
Flux resistance of the pulse compressor gratings is the most critical stage of a Chirped Pulse Amplification (CPA) scheme [1]
State of the art femtosecond compression gratings [2] exhibit a low damage threshold as they usually consist of a gold layer deposited onto an undulated organic film [3]
A sinusoidal metal grating is known to exhibit high diffraction efficiency, by means of a fabricable shallow corrugation, for the TM polarisation only; high diffraction efficiency for the TE polarisation requires very deep grooves. When this incidence configuration is used with high energy pulses problems may arise since any surface imperfections may excite local plasmons
Summary
Laboratoire Hubert Curien, UMR CNRS 5516 (formerly TSI), 18 rue B. More than 95% average efficiency TE-polarisation diffraction over a 200 nm wavelength range centred at 800 nm is obtained by a metaldielectric 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 More than 95% average efficiency TE-polarisation diffraction over a 200 nm wavelength range centred at 800 nm is obtained by a metaldielectric 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
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