High frequency pulser-sustainer for preionization in dc excited continuous wave CO2 lasers
| Autor: | S. V. Deshmukh, Anagha Mokhariwale, Ram Bahadur |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | Review of Scientific Instruments. 74:3886-3888 |
| ISSN: | 1089-7623 0034-6748 |
| DOI: | 10.1063/1.1593813 |
| Popis: | Slow flow diffusion cooled CO2 lasers mostly use dc electrical discharge for excitation. Preionization in the discharge tubes of such a laser helps to initiate and maintain the dc discharge at voltages below breakdown voltage. A high frequency pulser using an insulated gate bipolar transistor as switching device is developed for preionization of the 20 discharge tubes of the 1 kW multibeam CO2 laser that we have developed. This pulser produces positive pulses of 10 kV peak voltages; frequency variable from 1 to 5 kHz and its pulse width is variable from 1 to 10 μs. The rise time of the pulses is between 600 and 700 ns. Preionization allows dc discharge excitation simultaneously in all discharge tubes of the multibeam CO2 laser even at high operating pressures. Other advantages of the preionization technique, such as the discharge stability at lower discharge currents with lower ballast resistance and the shorter inactive zone in the discharge tubes, are discussed. This pulser can also be used with dc exci... |
| Databáze: | OpenAIRE |
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