Laser effect on the 248 nm KrF transition using heavy ion beam pumping

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• 作者：A. Adonin ; J. Jacoby ; V. Turtikov ; A. Fertman ; A. Golubev ; D.H.H. Hoffmann ; A. Ulrich ; D. Varentsov ; J. Wieser
• 关键词：Heavy ion beam ; Excimer transition ; Laser cavity ; Spontaneous and stimulated emission ; Laser threshold ; Spectral narrowing ; Time structure ; Deposited energy ; Particles per bunch ; Output power ; Laser efficiency
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2007
• 出版时间：1 July 2007
• 年：2007
• 卷：577
• 期：1-2
• 页码：357-360
• 全文大小：249 K

文摘

In December 2005 the first successful operation of a UV excimer laser pumped with a heavy ion beam was demonstrated at GSI. It was the first experiment in which the specific power deposition was sufficient to overcome laser threshold for a UV excimer scheme. The well known decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TJM-4N3P00H-F&_mathId=mml1&_user=10&_cdi=5314&_rdoc=64&_acct=C000050221&_version=1&_userid=10&md5=bdbe7943d5935940a6ad2c1a15e51e96"" title=""Click to view the MathML source"">KrF^* excimer laser line at has been chosen for this experiment, because the wavelength is short, but still in the range of usual optical diagnostic tools and the emitted light can propagate in air without attenuation. A bunch compressed beam with a particle energy of and about 110 ns pulse duration (FWHM) was used for this experiment. Single pulses of a beam intensity up to decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TJM-4N3P00H-F&_mathId=mml5&_user=10&_cdi=5314&_rdoc=64&_acct=C000050221&_version=1&_userid=10&md5=a5957bf338cac6699bd0f40e8793bfca"" title=""Click to view the MathML source"">2.5×10⁹ particles per bunch were focused into the laser cell along the cavity axis. Compact spectrometers, high speed UV-photodiodes and gated CCD-cameras were used for diagnostics of the spontaneous and stimulated emission. As a main result of the experiment laser effect on the 248 nm decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TJM-4N3P00H-F&_mathId=mml6&_user=10&_cdi=5314&_rdoc=64&_acct=C000050221&_version=1&_userid=10&md5=b1a656e3bd343538c15bef6aa12026b0"" title=""Click to view the MathML source"">KrF^* excimer laser line has been obtained and verified by temporal and spectral narrowing of the laser line as well as the threshold behaviour and exponential growth of intensity with increasing pumping power. In summary it could be shown that the pumping power of the heavy ion beam at GSI is now sufficient to pump short wavelength lasers. It is planned to extend laser experiments in near future to the VUV range of the spectrum .