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Development of a programmable flshlamp circuit for optical pumping

Alias, Asmawati@Fatin Najihah (2004) Development of a programmable flshlamp circuit for optical pumping. In: Regional Conference on Solid State Science And Technology , 2004, n/a.

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Flashlamp used in optical pumping is the preferred method for solid state laser. Triggering flashlamp generally requires very high voltage pulse of a short duration. In this study, a programmable xenon flashlamp driver was developed. The heart of the flashlamp driver is a PIC16F84A microcontroller that runs on a +5 V supply and clocked by 4 MHz resonator. This microcontroller was connected to a personal computer via serial port, acting as remote terminal. Initially, a TTL pulse output from PIC16F84A is sent out to drive an SCR. The SCR step-upped the TTL pulse to 650 volts pulse. Finally, a 1:2 transformer mixes the resulting 800 volts pulse with 2 kV DC voltage. The resulting voltage waveform is applied across a xenon flashlamp. Xenon gas ionizes for a brief period determined by the pulse width. This results in an electrical short circuit across the flashlamp's electrodes. A large amount of current, part of which is provided by a high voltage storage capacitor rated at 30 ?F and 15 kV, is drawn across the electrodes. This causes a rapid increase in the current flow through the flashlamp and initiates the desired arc lamp discharges.

Item Type:Conference or Workshop Item (Paper)
ID Code:20800
Deposited By: Mrs Liza Porijo
Deposited On:12 Aug 2017 04:48
Last Modified:12 Aug 2017 04:49

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