Prediction of CO&amp;lt;inf&amp;gt;2&amp;lt;/inf&amp;gt;laser signatures

Schiffner, G.

doi:10.1109/jqe.1972.1076888

Cited by 26 publications

(4 citation statements)

References 20 publications

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“…The picturesignature, seemingly chaotic, is stable, and does not change for some lengths of the optical resonator [3]. The signature is reproducible for very fixed and calculated optical lengths of the resonator.…”

Section: Methodsmentioning

confidence: 82%

<title>Physical phenomena in pulsed-CO<formula><inf><roman>2</roman></inf></formula> laser medium</title>

et al. 2003

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Section: Methodsmentioning

confidence: 82%

<title>Physical phenomena in pulsed-CO<formula><inf><roman>2</roman></inf></formula> laser medium</title>

et al. 2003

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“…This distribution is almost identical in variation with that of the gain for different J-values. (Garside et al 1975, Schiffner 1972. Power variation over the rotational lines due to any possible variation in the rotational relaxation from various levels to the lasing one is ruled out because the rotational relaxation rates have been found to be practically independent of the values of J (Cheo and Abrams 1969).…”

Section: Tuning: Results and Discussionmentioning

confidence: 99%

On obtaining well defined transverse modes and selective line tuning of a long CW CO₂laser

Kukreja¹,

Sehgal²,

Chatterjee³

et al. 1986

J. Phys. D: Appl. Phys.

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It is found that a long conventional CW CO2 laser cannot be tuned selectively because of the multidirectional modes formed through reflections at grazing angles from the inner walls of the discharge tubes. This problem has been overcome by inserting a number of properly designed mode-selecting apertures right into the discharge tubes and selective tuning over more than 150 rotational lines in both P and R branches of three vibrational bands (9.6, 10.6 and 11.2 mu m) has been achieved. The rotational lines of higher J-values that have a low gain tend to lase in the TEM10 mode. In the R branch two consecutive lines are observed to lase simultaneously when the angular width of the active medium subtended at the grating allows the existence of two physically tilted beams of different wavelengths dispersed by the grating used. The output power distribution over various lines almost follows that of the gain. The optimum design parameters of a long CW CO2 laser for tuning are obtained.

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“…Due to a high competition between rotational transitions in a CO 2 molecule, the laser usually operates on one, chosen emission line, where the distance (in frequency) between a resonance and central frequency of the line is the smallest (taking into account an emission line gain coefficient). Changes of the refractive index of the laser medium (or, in other words, changes of the optical length of the laser resonator) accompany the line hopping [8]. We measured the refractive index using a Mach-Zehnder interferometer, where the CO 2 laser medium (the laser cavity without mirrors) was put into one of the branch.…”

Section: Investigationsmentioning

confidence: 99%

Thermodynamic processes in an RF pulsed excited CO 2 slab-waveguide laser

et al. 2004

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A pulsed excitation of the laser plasma in gas lasers creates an acoustic wave in the laser reservoir. It changes thermodynamic parameters of the laser plasma in the laser cavity like pressure, and temperature, as well, and consequently it changes the density of the laser plasma, or, in other words, the refractive index of the laser medium. Tuning laser frequency during the pulse developing is observed as a result. The measurements of the pressure, temperature, and refractive index changes in an RF pulsed excited CO 2 slab-waveguide laser are purposes of the work. The pressure changes are measured with calibrated microphones situated close to the laser plasma. The temperature changes are calculated via measured refractive index characteristics, and simple formulas linking the refractive index with the gas density. The picture of the acoustic wave propagation in the laser cavity is presented. The obtained results give the picture of the laser plasma behavior during the pulsed excitation. It leads to a single frequency pulsed laser operation design.

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Prediction of CO<inf>2</inf>laser signatures

Cited by 26 publications

References 20 publications

<title>Physical phenomena in pulsed-CO<formula><inf><roman>2</roman></inf></formula> laser medium</title>

<title>Physical phenomena in pulsed-CO<formula><inf><roman>2</roman></inf></formula> laser medium</title>

On obtaining well defined transverse modes and selective line tuning of a long CW CO₂laser

Thermodynamic processes in an RF pulsed excited CO 2 slab-waveguide laser

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Prediction of CO&lt;inf&gt;2&lt;/inf&gt;laser signatures

Cited by 26 publications

References 20 publications

<title>Physical phenomena in pulsed-CO<formula><inf><roman>2</roman></inf></formula> laser medium</title>

<title>Physical phenomena in pulsed-CO<formula><inf><roman>2</roman></inf></formula> laser medium</title>

On obtaining well defined transverse modes and selective line tuning of a long CW CO2laser

Thermodynamic processes in an RF pulsed excited CO 2 slab-waveguide laser

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Prediction of CO<inf>2</inf>laser signatures

On obtaining well defined transverse modes and selective line tuning of a long CW CO₂laser