Title :
Dispersion of femtosecond pulses in ambient and low pressure air
Author :
Osvay, K. ; Börzsönyi, A. ; Kovács, A.P. ; Kurdi, G. ; Gorbe, M.
Author_Institution :
Dept. of Opt. & Quantum Electron., University of Szeged, Hungary
Abstract :
To measure the pressure dependence of dispersion, the Mach-Zender interferometer illuminated by 800nm, 16 fs pulses from a Ti:S oscillator working at 71 MHz repetition rate. The outcoming pulses from both arms were unified and sent to the entrance slit of an imaging spectrograph. The spectrally resolved interference fringes were then captured and evaluated, which provides directly the values of GDD, TOD and even higher order dispersion terms. When the tube was in air, the evaluation of the fringes provided the base dispersion values. Starting evacuating the tube, the spectrally resolved fringes were captured again at certain pressures. The dispersion falls exponentially with an exponent of 0.00149 mbar-1 but still exhibits a surprisingly high value of 4.7 fs2/m at more than four order of magnitude lower level than the standard pressure. The air conditioning system maintained constant the room temperature at 23 °C and the relative humidity at 60 %.
Keywords :
Mach-Zehnder interferometers; high-speed optical techniques; light interference; pressure measurement; sapphire; solid lasers; titanium; 1.8 m; 16 fs; 23 C; 293 to 298 K; 800 nm; Al2O3:Ti; Mach-Zehnder interferometer; Ti:S oscillator; femtosecond pulse dispersion; interference fringes; pressure measurement; spectrally resolved interference fringes; vacuum tube; Arm; Dispersion; Electron tubes; Interference; Laboratories; Laser theory; Oscillators; Physics; Pollution measurement; Ultrafast electronics;
Conference_Titel :
Lasers and Electro-Optics Europe, 2005. CLEO/Europe. 2005 Conference on
Print_ISBN :
0-7803-8974-3
DOI :
10.1109/CLEOE.2005.1568176