Beat spectrum of a dye laser generating three nonequidistant modes

Abstract

Few studies using high frequencies have been carried out on the sono-TiO 2 process, and consistent results based on the specific experimental conditions have not been reported thus far. Therefore, in the present work the effects of power density and dose on the kinetic constant of diethyl phthalate at 500 and 35 kHz using TiO 2 have been evaluated. The slopes of kinetic constants depending on the power density regardless of TiO 2 were increased and they were shown to be linear. However, the enhancement percentage according to the frequencies at 500 kHz was lower than that at 35 kHz, though clear discussions on the enhancement in the presence of TiO 2 have not yet been produced. Also, the optimal dose was 1 g/L, which was not changed according to the frequency. #

Four-wave mixing and generation of short pulses in multimode class B laser amplifiers

“…The multiple-frequency model is presented here to cover both cases, simultaneously. It is demonstrated that the coupling of satellite lines generates a train of short pulses of a duration in the order of picoseconds within experimental results [2,15]. If the number of satellite lines is increased in the frequency domain, then shorter pulses will be created in the time domain by approaching the injection-locking borders [6,16].…”

“…The first image satellite line α − is now produced by the FWM process between the strong electric field of the central mode α L0 and the amplified input signal α + proportional to the input signal amplitude β S . The central-mode frequency of the free-running laser ω L0 is to shift by the second-order value ω L correct to β 2 S , so that the central-mode frequency of the laser amplifier ω L is now equal to [10,15]…”

“…The relation (15) indicates that the phase of the input signal remains unchanged during its interaction with the laser. The phase beating conditions ( 16) and ( 17) are identical to the mode-locking conditions of the central and adjacent modes in the multimode free-running class B lasers [18].…”

“…There are two different methods to replace the out-phased oscillations of the longitudinal modes of a slave laser by the phase-locked oscillations of satellite lines. The first method is to let the cavity-adjacent modes oscillate above the threshold state, then an optical signal is injected through the locking range of the first adjacent mode [2,3,15]. The second method is to keep the cavity-adjacent modes just below the threshold state, so that the sequence of signal and image satellite lines are now produced by four-wave mixing (FWM) interaction between the cavity central mode and the amplified input signal [16,17].…”