Interference and holography with femtosecond laser pulses of different colours

摘要: Interferometry and holography are two domains that based on observation recording of interference fringes from light beams. While the aim first technique is to reveal map phase difference wave fronts, main task second reconstruct one waves via diffraction other recorded fringe pattern (hologram). To create fringes, mutually coherent same laser commonly used. It shown here can be observed holograms with ultrashort, sub-picosecond pulses even different colour, generated in our experiment parametric amplifiers seeded, both by mode-locked Ti-sapphire laser. The appearance permanent transient gratings confirmed an image-bearing hologram, two-beam coupling gain a pump-probe frequency conversion Raman-Nath self-diffraction moving grating.