Development of long pulsed ND:yag laser system

The Nd:YAG laser with long pulse duration can be produce by using an appropriate pumping scheme. The purpose of this study is to construct a high voltage power supply for laser system. In this attempt multiple-mesh pulse forming technique was performed to obtain electrical pump pulses with a more rectangular shape and long normal-mode laser pulses at constant power. The flashlamp driver was designed with variable input energy. The developed flashlamp driver composes of five major electronic circuits. There are comprised of signal controller device, simmer power supply (SPS), trigger pulse ignition circuit, capacitor charging power supply (CCPS) and multiple-mesh LC pulse forming network (MPFN). The construction of the flashlamp driver is started by designing a signal controller. The controller generated a small voltage to activate the electronic components such as silicon controlled rectified (SCR) and transistor. The ignition circuit was used to ignite xenon gases which responsible to form ionized spark streamer between the two electrodes of flashlamp. A Low dc current was induced by the simmer power supply to sustain the flashlamp in simmering mode. The capacitor charging power supply was used to supply electrical power to capacitor bank within specific time. Nd:YAG laser oscillator was aligned and pumping by the new developed flashlamp radiation. As a result Nd:YAG laser beam was generated having fundamental wavelength of 1064 nm and 650 microsecond of pulse duration with maximum output energy of 250 mJ

Development of long pulse Nd. YAG laser system

The Nd:YAG laser with long pulse duration can be produced by using an appropriate pumping scheme. The purpose of this study is to construct a high voltage power supply for laser system. In this attempt multiple-mesh pulse forming technique was performed to obtain electrical pump pulses with a more rectangular shape and long normal-mode laser pulses at constant power. The flashlamp driver was designed with variable input energy. A linear xenon flashlamp was selected as an optical pump for Nd:YAG laser crystal. The developed flashlamp driver consists of five major electronic circuits. These are signal controller device, simmer power supply (SPS), trigger pulse ignition circuit, capacitor charging power supply (CCPS) and multiple-mesh LC pulse forming network (MPFN). The construction of the flashlamp driver started with the design of a signal controller. The controller generated a small voltage to activate the electronic components such as silicon controlled rectified (SCR) and transistor. The ignition circuit was used to ignite xenon gases responsible to for forming ionized spark streamer between the two electrodes of the flashlamp. A low dc current was induced by the simmer power supply to sustain the flashlamp in simmering mode. The capacitor charging power supply was used to supply electrical power to capacitor within specific time. Radiation emitted by flashlamp was used to pump the Nd:YAG crystal. As a result a powerful Nd:YAG laser beam was generated having fundamental wavelength of 1064 nm, 650 microsecond pulse duration with maximum output energy of 250 mJ

The effects of temporal delay on the performance of an electro-optic Q-switched Nd:YAG laser

The performances of an electro optic Q-switched Nd:YAG laser at transition line of4F3/2?4I11/2Stark level based on DKDP crystal is presented. The temporal delay time between the ignition of Xenon flashlamp and the Q-switched trigger signal is manipulated to determine the best performances of the Q-switched laser. The results shown that opening the Q-switching is dependent on the pumped energy. The higher the pumping energy the longer the temporal delay is desired to achieve the optimum output. However the temporal delay may remain constant if the laser is pumped with low energy. In general the performance of the Q-switched laser is found independently on the temporal delay, whereby all tested temporal delays almost have similar slope efficiency of 18%