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17 Mar 2003

Volume 82, Issue 11, pp. 1649-1799

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Appl. Phys. Lett. 82, 1709 (2003); http://dx.doi.org/10.1063/1.1560575 (3 pages)

Ji-Won Oh, Masahiro Yoshita, Hidefumi Akiyama, Loren N. Pfeiffer, and Ken W. West
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Potential for a hydrogen water-plasma laser

R. L. Mills, P. C. Ray, and R. M. Mayo

Appl. Phys. Lett. 82, 1679 (2003); http://dx.doi.org/10.1063/1.1558213 (3 pages) | Cited 14 times

Online Publication Date: 10 March 2003

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A stationary, electronically excited, population inversion of atomic hydrogen, H, has been observed in a low-pressure water-vapor microwave discharge plasma. The inverted H population was evident from the relative intensities of the transitions within the Lyman series (n=2, 3, 4, and 5 to n=1) and within the Balmer series (n=3, 4, 5, 6, 7, and 8 to n=2). Back illumination with a broadband (vis/IR) lamp source showed depopulation of the n=5 state. Lines of the Balmer series of n=5, and 6 to n=2 and the Paschen series of n=5 to n=3 were of particular importance because of the potential to design blue and 1.3 μm infrared lasers, respectively, which are ideal for many communications and microelectronics applications. High-power hydrogen gas lasers are anticipated at wavelengths over a broad spectral range from far infrared to violet which may be miniaturized to micron dimensions. Such a hydrogen laser may prove to be the most versatile and useful of all. © 2003 American Institute of Physics.
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42.55.Lt Gas lasers including excimer and metal-vapor lasers
52.75.-d Plasma devices
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