Investigation of the vibrational temperature kinetics in a TEA CO2laser

Bertel, I. M.; Petukhov, V. O.; Stepanov, B. I.; Trushin, Sergey; Churakov, V. V.

doi:10.1070/qe1982v012n08abeh005782

Cited by 19 publications

(9 citation statements)

References 2 publications

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“…The calculations were performed based on a vibrational temperature model [4] that is in wide use for simulations of the active medium of CO 2 lasers. The measurements have shown that under the above conditions: T = 350 ± 10 K, T 1 = T 2 = 420 ± 20 K, and T 3 = 1475, 1510 and 1550 ± 15 K for molecules 12 designates the gas temperature.…”

Section: Introductionmentioning

confidence: 99%

“…T 3 is the temperature of asymmetric vibrations. The technique used and apparatus to measure gains and to determine vibrational temperatures were described in [4][5][6][7][8][9][10]. The gain spectrum was calculated using the scheme described in [11].…”

Section: Introductionmentioning

confidence: 99%

“…Measurements carried out at t = 4 ls after the start of the discharge when the highest gains were realized. Gain measurements were performed by probing the active medium with a cw laser, lasing on the corresponding lines [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Detection of small N2O concentrations using a frequency doubled 12C18O2 laser

Petukhov

Горобец

Matsukevich

et al. 2005

Infrared Physics & Technology

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Detection of small N2O concentrations using a frequency doubled 12C18O2 laser

Petukhov

Горобец

Matsukevich

et al. 2005

Infrared Physics & Technology

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“…However with such geometry an increase in the angle of incidence leads to a sharp decrease in the grating efficiency [8]. The gain on the sequence band of CO 2 in a sealed-off longitudinal discharge laser is typically 2 x 10 -3 cm -1 [9] . Therefore the grazing incidence configuration is unsuitable for low-gain laser systems .…”

mentioning

confidence: 99%

Hot-cell-free Sequence-band CO₂Laser

Solodukhin

1987

Journal of Modern Optics

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A simple new technique for separating sequence band lines in a sealed-off longitudinal d .c . discharge CO 2 laser is described . Non-Littrow mounting of the grating allows lasing to be obtained on sequence bands without use being made of an in-cavity hot cell . As an example, the oscillation spectra on regular and sequence bands of two isotopic species are presented .The sequence bands (00°2-[10°1, 02°1] 1 , 11 transitions) make it possible to increase the number of CO 2 laser lines, and are of great interest in solving various problems of atmospheric monitoring, optical pumping of FIR lasers [1,2], and laser media diagnostics [3]. Owing to the anharmonicity of the CO 2 molecule, the sequence line frequencies lie between the frequencies of the regular transitions . The sequence line gains are usually -30 to 40 per cent of those for the lines of the regular band . Therefore, sequence transitions do not appear in the radiation of CO 2 lasers that use only an autocollimation grating for discriminating the lines of regular transitions [4] .In order to obtain oscillation on the sequence band, the method of suppressing lasing on the regular band 00°1-[10°0, 02°0] 1 , 11 by inserting into the cavity a cell with heated (-350'Q CO 2 is usually employed [5,6] . The use of heated CO 2 for suppressing all transition of the regular band is very efficient in obtaining a large number of sequence-band lines . However, this technique has two drawbacks . Firstly, the fact that CO 2 is a weak 10µm absorber requires that the in-cavity cell length be approximately one-third of the discharge length . This leads to an increase of the cavity length, which is inconvenient for many applications . Secondly, cell windows introduce an additional loss into the cavity . To reduce the cavity length, Reid and Siemsen [4] used a short in-cavity cell containing a stronger absorber (NH 3) for suppressing oscillation on the regular lines . By employing this technique they obtained lasing on five sequence lines .In the present paper the possibilities are considered of CO 2 laser tuning on the sequence-band lines by using non-Littrow (non-autocollimation) mounting of the grating .With non-autocollimation mounting of the grating, radiation is doubly diffracted by it during one round-trip, which leads to the fact that the angular dispersion of this type of cavity is equal to three times the dispersion of the grating .A higher spectral resolution may be achieved by using so-called `grazing incidence' on the grating . Grazing incidence geometry is successfully employed in high-gain systems such as dye lasers [7] and high-pressure TE CO 2 lasers [8] for line-narrowing oscillation . However with such geometry an increase in the angle of incidence leads to a sharp decrease in the grating efficiency [8]. The gain on the sequence band of CO 2 in a sealed-off longitudinal discharge laser is typically

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“…The conditions for obtaining effective lasing at the rotational-vibrational transitions of the 02 0 1-01 1 1 (λ = 16.4 μm) and 10 0 1-01 1 1 (λ = 14.1 μm) bands of the CO 2 molecule are examined. To obtain population inversion in the indicated channels one should initially populate the 00 0 2 vibrational level, considerable population of which can be accomplished comparatively simply, for example, in an electric discharge [2,3]. Then a powerful two-frequency radiation resonant with the 00 0 2-02 0 1 (10 0 1) and 01 1 1-11 1 0(03 1 0) transitions, saturating an individual rotationalvibrational transition, acts on the medium excited in such a way.…”

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confidence: 99%

16(14) microns TE CO<inf>2</inf> laser working on the 0200(1000)-0110 and 0201(1001)-0111 bands

Petukhov

Горобец

2008

2008 4th International Conference on Advanced Optoelectronics and Lasers

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The optimization of the active medium and its electrical discharge pumping conditions based on the original technique of gain measurements on the several bands (00 0 1-10 0 0, 00 0 2-10 0 1, 01 1 1-11 1 0) of CO 2 molecule allowed to obtain in the simple TE CO 2 laser with UV preionization (the active media length is 70 cm, the width of electrodes is 2.5 cm, the interval between electrodes is 2 cm, the voltage on the 0.2 microFarad capacitor is 6.5 kV) the powerful lasing (57 mJ) on the 02 0 0(10 0 0)-01 1 0 band (λ~16 (14) micrometers) at room temperature.. To increase the power performances of the 16 (14) microns CO 2 laser the possibility of lasing on the 02 0 1-01 1 1 band have been experimentally and theoretically investigated under the combined (electrical + optical) excitation of the active medium. The necessary conditions for the effective lasing have been determined. It is shown that in optimum conditions the output energy can reach 1,3 J/l at the peak power 5 MW and at the full efficiency of 2 %.

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Investigation of the vibrational temperature kinetics in a TEA CO₂laser

Cited by 19 publications

References 2 publications

Detection of small N2O concentrations using a frequency doubled 12C18O2 laser

Detection of small N2O concentrations using a frequency doubled 12C18O2 laser

Hot-cell-free Sequence-band CO₂Laser

16(14) microns TE CO<inf>2</inf> laser working on the 02<sup>0</sup>0(10<sup>0</sup>0)-01<sup>1</sup>0 and 02<sup>0</sup>1(10<sup>0</sup>1)-01<sup>1</sup>1 bands

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Investigation of the vibrational temperature kinetics in a TEA CO2laser

Cited by 19 publications

References 2 publications

Detection of small N2O concentrations using a frequency doubled 12C18O2 laser

Detection of small N2O concentrations using a frequency doubled 12C18O2 laser

Hot-cell-free Sequence-band CO2Laser

16(14) microns TE CO<inf>2</inf> laser working on the 02<sup>0</sup>0(10<sup>0</sup>0)-01<sup>1</sup>0 and 02<sup>0</sup>1(10<sup>0</sup>1)-01<sup>1</sup>1 bands

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Investigation of the vibrational temperature kinetics in a TEA CO₂laser

Hot-cell-free Sequence-band CO₂Laser