Ar[sub 2] excimer emission from a laser-heated plasma in a high-pressure argon gas

Takahashi, A.; Okada, T.; Hiyama, T.; Maeda, M.; Uchino, K.; Nohdomi, R.; Mizoguchi, H.
December 2000
Applied Physics Letters;12/18/2000, Vol. 77 Issue 25
Academic Journal
We investigated a pump scheme to establish a practical Ar[sub 2] excimer laser operating at 128 nm. In this scheme, electrons generated by preionization of Ar gas at high pressure were heated by intense pulsed CO[sub 2] laser radiation. The resultant high-density plasma in the high-pressure Ar gas was used to create excited Ar dimers. In the experiment, a CO[sub 2] laser beam from a transversely excited atmospheric CO[sub 2] laser was focused on a narrow line, 100 mm in length, in Ar gas at a pressure of 2 MPa. A vacuum ultraviolet (VUV) signal was observed only when the Ar was preionized, and the VUV signals were identified as the emission of Ar[sub 2] excimers from the features of the spectrum which was centered on 128 nm. © 2000 American Institute of Physics.


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