Picosecond Laser Pulse Measurement

Fwhm laser is the pulse width of the laser excitation source.

Picosecond laser pulse measurement.

The nature of the. The microwave burst generated by a gaas switch activated by a 30 ps 1 06 lm optical pulse coming from nd y ag mode locked laser is gated by laser induced reflec tivity in a ge wafer. The microwave reflectivity of the ge is measured as a. The width of the cross correlation curve is about 75 ps when the length of cs 2 medium is 1 cm which is the same as the result of no cs 2 fig.

Article osti 1185500 title multifunctional optical correlator for picosecond ultraviolet laser pulse measurement author rakhman abdurahim and wang yang and garcia frances and long cary d. Despite the high velocity of light ultrashort pulses can also be very short in the spatial domain. Measure picosecond dura tions accurately in essence. A 1 ns pulse still has a length of 30 cm in air the shortest pulses which can be generated directly with a laser with a duration of roughly 5 fs have.

Picosecond pulsed diode lasers are the most common light source for tcspc measurements. As the first stage of pulse width measurement however we examined a pulse width measurement technique in the picosecond range by using. The technique is capable of measuring pulse widths at least as short as 4 10 13 sec. The special symmetry properties of second harmonic generation at the surface of a gaas crystal are used in a technique which measures the shape of the fast pulses from a mode locked nd glass laser.

The schematic diagram of the experimental setup for the spatiotemporal intensity measurement of the picosecond laser pulses by using the cup system is shown in fig. Sapphire regenerative amplifier spectra physics spitfire ace 35f is used to generate the picosecond or femtosecond laser pulses with the central wavelength of 800 nm and repetition rate of 1 khz. The measurement of time bandwidth product of the generated coherent picosecond pulses at 500 mhz modulation gave the value of 0 38 for lorentzian pulse shape with a full width at half maximum of nearly 34 ps which proved definitely the fourier transform limited character more less. The spatial width of a pulse in the propagation direction is given by the group velocity times the temporal pulse width.

The temporal evolutions of the picosecond pulse are measured when the picosecond laser pulse propagates in cs 2 nonlinear medium with different lengths which are presented in fig. A pump probe technique that uses a femtosecond laser and ultra short gamma ray pulses is the most potential candidate. The pulses studied were found to have a full width at half power of between 4 and 6 picoseconds. And huang chunning and takeda yasuhiro and liu yun abstractnote a compact optical correlator system that measures both the autocorrelation between two infrared ir lights and the cross.

Picosecond microwave pulse measurement.