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FEMTOLASER TROJA

FEMTOLASER TROJA. P 7 Laserove systemy Revize 18.5.2009. Chirped-Pulse Amplification. Short pulse oscillator. CPA is THE big development. G. Mourou and coworkers 1983. t. Dispersive delay line. t. Solid state amplifier(s).

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FEMTOLASER TROJA

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  1. FEMTOLASER TROJA P 7 Laserovesystemy Revize 18.5.2009

  2. Chirped-Pulse Amplification Short pulse oscillator CPA is THE big development. G. Mourou and coworkers 1983 t Dispersive delay line t Solid state amplifier(s) Chirped-pulse amplification in-volves stretching the pulse before amplifying it, and then compressing it later. t Pulse compressor We can stretch the pulse by a factor of 10,000, amplify it, and then recompress it! t

  3. pump output input pump gain gain input/output polarizer Pockels cell Two main amplification methods Multi-pass amplifier Regenerative amplifier

  4. Faraday rotator thin-film polarizer Pockels cell Pockels cell Regenerative amplifier geometries This design is often used for kHz-repetition-rate amplifiers. This is used for 10-20-Hz repetition rates. It has a larger spot size in the Ti:sapphire rod. The Ti:Sapphire rod is ~20-mm long and doped for 90% absorption.

  5. Specifications:

  6. Spectrum : • Oscillator: • Oscillator: • Central wavelngth : 802 nm • FWHM spectrum : 32 nm • Power : 130 mW in mode-locked conditions Spectrum after stretcher

  7. Spectrum after compressor • Compressor • Central wavelength : 802 nm • FWHM spectrum : 27 nm

  8. Pulse duration Interferometer and phase Pulse duration : 63 fs

  9. nanosecond contrast : • Measurement with the photodiode and calibrate densities. • Pre-pulses @11 ns (one round trip of the regenerative amplifier : < 1/1 500

  10. Picosecond contrast • The measurements of the contrast are made with the SEQUOIA (Third order autocorelator).

  11. Contrast : @ 1ps : < 10E-4 @ 5 ps : < 10E-6 @ 10 ps and ASE : < 10E-8

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