Specific Ionized Laser Systems

Willett, Colin S.

doi:10.1016/b978-0-08-017803-5.50011-3

Cited by 2 publications

(3 citation statements)

References 99 publications

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“…P is related to the fractional gain per unit distance, a, at the centre of a Doppler-broadened line by the following expression (cf. Willett, 1974) where 1, is the centre wavelength of the transition, and Av is the linewidth. a describes the intensity of a plane wave at Lo according to where I is the length over which gain occurs.…”

Section: Resultsmentioning

confidence: 99%

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Laser action in stellar envelopes

Varshni

Lam

1976

Astrophys Space Sci

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Abstract. It is shown that in high-temperature stars in which high speed mass loss is occurring, the rapidly recombining plasma in the stellar envelope can act as an amplifying medium. Model calculations for laser action in He 11 1-4686, using the collisional-radiative model, are presented. Menzel's hypothesis of laser action in distended stellar atmospheres is shown to be fully substantiated. The relevance of these results in resolving the problem of intensity anomalies in the spectra of WolfRayet stars is pointed out.

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Section: Resultsmentioning

confidence: 99%

“…A number of workers (Bates and Kingston, 1963;McWhirter and Hearn, 1963;Drawin, 1969;Zemtsov, 1969;Bohn, 1971 ;Fujimoto et al, 1972), using this model, have carried out calculations on the properties of a rapidly decaying monoatomic plasma. We shall also use the CR model here.…”

Section: The Expanding Envelopementioning

confidence: 99%

Laser action in stellar envelopes

Varshni

Lam

1976

Astrophys Space Sci

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“…A lot of experimental research into the He-Ne laser has been carried out since the 1960s, which has produced a variety of results for the optimum parameters [8]. Its kinetics process is well known.…”

Section: Introductionmentioning

confidence: 99%

High power He–Ne laser with flat discharge tube

Ling¹

2006

J. Phys. D: Appl. Phys.

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A high-power He–Ne laser with a flat discharge tube has been realized. Its output power can be enhanced by increasing the transverse size of the discharge tube. This high-power flat He–Ne laser tube of 1.4 m discharge length can achieve above 180 mW of output power at a wavelength of 0.6328 µm. Its optimum discharge parameters and the gain characteristics are investigated experimentally. The experiments indicate that the optimum current increases with decreasing total gas pressure. But the increase in the optimum current is almost independent of the gas mixture ratio. The increase in the gain coefficient at the axis of the discharge tube with discharge current is not obvious. The boost in laser output power is mainly caused by the expansion of the lasing gain region. To achieve the higher output power, four of the laser tubes mentioned above are placed into one laser box. The laser beams are coupled into a quartz optic fibre and the output power from the end of the optic fibre can reach above 480 mW. This high-power He–Ne laser has been used in a clinical application, photodynamic therapy (PDT) of cancer, and its effective rate is above 90% in 183 clinical cases. The structure, characteristics and applications of this high-power flat He–Ne laser are introduced and discussed in this paper.

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Specific Ionized Laser Systems

Cited by 2 publications

References 99 publications

Laser action in stellar envelopes

Laser action in stellar envelopes

High power He–Ne laser with flat discharge tube

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