&lt;title&gt;Microwave excitation of a XeCl laser without preionization&lt;/title&gt;

Klingenberg, H. H.; Gekat, Frank; Spindler, G.

doi:10.1117/12.20601

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…'°T o examine the influence of the microwave pulse parameters a klystron transmitter was added to the microwave assembly described in Ref. 9. It is equipped with a YK 1420 klystron manufactured by Valvo, Hamburg, Germany.…”

Section: Hpm Source Considerationsmentioning

confidence: 99%

Pulsed microwave excitation of rare-gas halide mixtures

Gekat

Klingenberg

1991

SPIE Proceedings

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To investigate the excitation technique of high pressure gas lasers by high power microwave discharges, a WR-650 waveguide circuit was assembled. The pulsed microwave source was a magnetron transmitter with a frequency of 1355 MHz, a nominal pulsed power of 2.5 MW and a pulse length of 4 js. The pulse repetition frequency was 10 Hz. A double ridge waveguide coupling structure was designed. The results from these experiments have shown the need for a high power broadband modulateable microwave source to achieve further knowledge important for the design of compact, high power microwave excited lasers. For these purposes, a former radar transmitter, based on an amplifier chain terminated by a klystron, was modified. The transmitter has a center frequency of 1400 MHz with an instantaneous bandwidth of 100 MHz, a pulsed power of 10 MW, a maximum pulse length of 6 js and a maximum repetition frequency of 450 Hz. The amplifier chain is driven by a dielectric resonance oscillator which is pulse modulated by very fast pin diodes. This design allows the generation of multiple pulses within the 6 .is time window with microwave pulse rise times of the order of ten's of nanoseconds. The results obtained with this equipment will be presented.

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Section: Hpm Source Considerationsmentioning

confidence: 99%

Pulsed microwave excitation of rare-gas halide mixtures

Gekat

Klingenberg

1991

SPIE Proceedings

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1.3 mJ XeCl laser pumped by microwaves

Klingenberg

Gekat

1991

Applied Physics Letters

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Design of Microwave Pulse Compression Circuits for the Excitation of Pulsed High Power Gas Lasers

Gekat¹,

Klingenberg²

1992

Twentieth Conference Record on Power Modulator Symposium

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During the last decade, the microwave discharge was investigated as an alternative technique avoiding some of the disadvantages associated with the transversely excited atmosphere (TEA-) discharge such as preionization, instabilities and pulse length limitations due to the metallic electrodes. However, up to now one drawback of the pulsed high power microwave discharge was the lack of commercially available high power microwave tubes with pulsed output powers in the region of 100 MW to 1 GW. There are two methods for achieving output powers comparable to relativistic sources. One way is the combining of several conventional tubes, which is rather complicated especially for magnetrons. The other method is the compression of the microwave pulse of a conventional tube by means of a microwave cavity or a network of delay lines and hybrids. This paper describes the application of microwave pulse compression using Q-switching for discharging the storage cavity.Under optimum conditions, up to 80 % of the microwave pulse energy can be stored in a cavity and delivered to a matched load via triggering a suited switching element. The design discussed in this paper uses the laser discharge as switch. The plasma tube is integrated in the storage cavity and the discharge is triggered when the electric field strength exceeds the holdoff field strength of the gas mixture. The microwave source was operated at power levels of 4.5 -5 MW and at repetition rates of 10 -20 Hz. With a stored energy of 1.4 J a XeCl laser featuring a pulse energy of 4 mJ and a pulse length of 16 ns could be realized without any preionization. The discharge structure was in no way optimized. Principal limitations in laser pulse energy and repetition frequency are arising from the fact that the discharge acts both as a switch and as laser amplifier. Considerable improvements in the performance of the complete system can be expected, if the cavity is discharged by an optimized switch while the laser discharge acts only as a load. Some theoretical aspects of the pulse compression circuit will be presented together with experimental results.The results show the potential of realizing microwave discharge pumped excimer lasers with output powers ranging from 10 to 100 d. A laser head powered by a S-band (3 GHz) magnetron would be rather compact, because it comprises only a storage cavity and a discharge structure without any high voltage component. The feeding could be done via a flexible waveguide. In this way using microwave pulse compression techniques, the microwave discharge is an interesting alternative to TEA-discharges.Alvarez obtained a power "gain" of 18 dB utilizing a klystron transmitter [5]. The second technique (SLED or LIPS) was proposed by Farkas et al.[2] at the Stanford Linear Accelerator Center. The third method, BPM, was also evaluated by Farkas [3]. The pulse compression is initiated by fast phase switching of the master oscillator signal. Therefore the compressed pulse is phase-correlated to the master oscillator. This feature is absolutel...

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<title>Microwave excitation of a XeCl laser without preionization</title>

Cited by 3 publications

References 6 publications

Pulsed microwave excitation of rare-gas halide mixtures

Pulsed microwave excitation of rare-gas halide mixtures

1.3 mJ XeCl laser pumped by microwaves

Design of Microwave Pulse Compression Circuits for the Excitation of Pulsed High Power Gas Lasers

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