CO&lt;sub&gt;2&lt;/sub&gt; lasers

Соболев, Н. Н.; Sokovikov, V. V.

doi:10.3367/ufnr.0091.196703d.0425

Cited by 38 publications

(3 citation statements)

References 40 publications

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“…3). Another type of "crossluminescence like" transitions between the Cs+(5p6) band an the next core I-(5s) band were suggested for the observed fast emission in [18]. The small decay time of the emission has been explained by the high probability of Auger relaxation of the hole in the deep I ~ (5s) band (i.e.…”

Section: Csimentioning

confidence: 96%

Intraband Luminescence in Ionic Crystals

Deich

Abdrakhmanov

1992

Physica Status Solidi (b)

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Time-resolved luminescence spectra of CsI, NaI, cr-Al,O,, and AgBr are investigated under subnanosecond electron pulse excitation. New intrinsic emission bands with a decay time less than 20 ps are revealed. It is proposed that the fast emission components originate from hot carrier intraband radiative transitions. The intraband luminescence spectra and light output are temperature independent and are not affected by crystal impurities. The correlation between the intraband luminescence spectra and crystal band structure is discussed.HCCJIeAOBanHCb CneKTpbI JIIoMAHeCqeHqAA KpACTaJIJIOB CSI, NaI, tX-Al,O, A AgBr npA B036YXAeHHH CY6HaHOCeKYHAHblMA AMIIyJIbCaMH 3JIeKTpOHOB. 06HapyXeHbI IIOJIOCbI JIIoMAHeCUeHIJAM C naroceKYHAHblM BpeMeHeM peJIaKCaUAEi, 06yCnOBJIeHHbIe A3JIyYaTenbHbIMA BHYTpH3OHHbIMA IIepOXOAaMH rOpRYAX HOCATeJIefi 3apXAa. CIIeKTpbI A BbIXOA BHYTPA3HHOfi JIKIMAHeCqeHqAA He 3aBACRT OT TeMnepaTYPbI A IIpIlMeCHOrO COCTaBa KpACTaJIJIa. 0 6 c y x , q a e~c~ KOppenRUAR CIIeKTpOB BHYTPA30HHOfi JIWMHHecqeHqm c ~O H H O~~ C T P Y K T Y P O~~ KpAcTanna.

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Section: Csimentioning

confidence: 96%

Intraband Luminescence in Ionic Crystals

Deich

Abdrakhmanov

1992

Physica Status Solidi (b)

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“…The kinetics of the processes in the CO 2 :CO mixture is mainly similar to the kinetics in the CO 2 :N 2 mixture. The appearance of the CO molecules in the composition of the mixture leads to an increase in the rate of pumping and in the lifetime of the upper laser level and also to a decrease in the lifetime of the 01 1 0 level [20]. This leads to easier implementation of the conditions T 3 > 1.69T 1 and T 1 > T 2 in the CO 2 :N 2 :CO:He mixture in comparison with the CO 2 :He one.…”

Section: Introductionmentioning

confidence: 90%

“…From (15) it is seen, first, that the relationship between the temperatures T 1 and T 2 on selective excitation of the 00 0 1 level is determined by the ratio of the times τ 12 /τ V−T rather than by one time τ 12 and, second, that the condition of vibrational equilibrium of the ν 1 and ν 2 modes (or the equality T 1 = T 2 ) cannot be satisfied in principle in the given case, since it requires that the condition τ 12 < τ V−T be satisfied, which contradicts the reality for the CO 2 :He mixture [20]. From Eq.…”

Section: Introductionmentioning

confidence: 91%

Vibrational kinetics of the active media of CW CO2 lasers

Невдах

Ganjali

2005

J Appl Spectrosc

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The vibrational kinetics of CW CO 2 lasers has been analyzed within the framework of a temperature model. The necessity of taking into account the coupling of the vibrational modes of the CO 2 molecule in determining the occupation numbers and the store of vibrational energy in individual modes is shown. Expressions that connect vibrational temperatures with the rates of excitation and relaxation of the lower vibrational levels of modes have been obtained. The ratios between the vibrational temperatures on selective excitation of the 00 o 1 level and on excitation of CO 2 molecules in an electric discharge as well as the character of the dependences of vibrational temperatures on the pumping-energy value are discussed. Introduction.The most widespread mathematical model used for calculating the energy and spectral characteristics of continuous wave and pulsed (with pulse duration longer than 10 −6 sec) CO 2 lasers is a temperature model. Physically, the model is based on the "hierarchy" of relaxation times that is typical of the CO 2 molecule under the conditions of an active medium:are the times of rotational-translational, vibrational-vibrational intramode, vibrational-translational, and vibrational-vibrational intramode relaxation, respectively (see, e.g., [1][2][3][4]). Within the framework of the temperature model, the vibrational modes ν 1 , ν 2 , and ν 3 of the CO 2 molecules and ν 4 of the N 2 molecules are considered as simple harmonic oscillators. The distributions of populations over the vibrational levels of each of these modes are described by the Boltzmann distributions with vibrational temperatures T i (i = 1, 2, 3, 4). Knowing the vibrational temperatures, it is possible to determine the population of any vibrational level of the CO 2 and N 2 molecules and also the stores of vibrational energy in their modes. The main drawback of this approach is that the vibrational modes of the CO 2 molecule are considered as independent modes, whereas the vibrational temperatures of these modes are regarded as independent parameters.In the present work, within the framework of the temperature model we analyze the vibrational kinetics of continuously pumped CO 2 lasers taking into account the fact that because of the coupling of the vibrational modes of the CO 2 molecule the vibrational temperatures are not independent parameters.Occupation Numbers of the Vibrational Modes of the CO 2 Molecule. In the temperature model the vibrational temperatures of the CO 2 and N 2 molecules are determined [1-4] from the conditions

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Elementary Quantitative Theory of Laser Action in the 1+ Band System of N2

Skobel’tsyn

1973

Physical Processes in Lasers

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CO<sub>2</sub> lasers

Cited by 38 publications

References 40 publications

Intraband Luminescence in Ionic Crystals

Intraband Luminescence in Ionic Crystals

Vibrational kinetics of the active media of CW CO2 lasers

Elementary Quantitative Theory of Laser Action in the 1+ Band System of N2

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