<i>Q</i> SWITCHING OF MOLECULAR LASER TRANSITIONS

Kovacs, Mark A.; Flynn, George W.; Javan, A.

doi:10.1063/1.1754484

Cited by 63 publications

(4 citation statements)

References 3 publications

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“…In the D-region proton hydrates (PH's) are observed to be dominant ions, in many observations, and their origin has been explained3,4 as a consequence of hydration of N0+, and to lesser extent 02+, followed by the reactions N0+(H20)3 + H20 -H+(H20)3 + HN02 (1) and 2+• 2 + H20 -H30+-0H + 02 (2) Reaction 2 is rapidly followed by 30+•0 + H20 -H+(H20)2 + OH (3)…”

Section: Stratospheric Positive Ion Chemistrymentioning

confidence: 99%

“…In order to extend D-region positive ion chemistry into the stratosphere, we pose two questions: (1) Will the PH's still be formed, or do stratospheric species exist which will interefere with their production? (2) If the PH's are formed, do stratospheric species exist with which they will then react, leading to more stable positive ions?…”

Section: Stratospheric Positive Ion Chemistrymentioning

confidence: 99%

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Ion chemistry of the stratosphere

Ferguson¹,

Arnold²

1981

Acc. Chem. Res.

116

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Section: Stratospheric Positive Ion Chemistrymentioning

confidence: 99%

Section: Stratospheric Positive Ion Chemistrymentioning

confidence: 99%

Ion chemistry of the stratosphere

Ferguson¹,

Arnold²

1981

Acc. Chem. Res.

116

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“…In particular, much work has been done to study the active and passive Qswitched CO 2 lasers [4], and different methods have been developed. Switching of the cavity loss by electro-optical and acousto-optical effects [5,6], by motion of the cavity elements (a rotating mirror or prism, or a shutter) [7] or by means of saturable absorbers (doped Ge, thin films and fluid cell) [8,9,10] are commonly used. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Effect of non-lasing vibro-rotational levels on the dynamics of the Q-switched CO₂ laser

Gao²,

Jiang

et al. 2004

Laser Phys. Lett.

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A fast chopper is used to set up a mechanical Qswitched CO 2 laser and pulse trains of repetitively Q-switched generation are recorded. We put special emphasis on the effect of the non-laser vibro-rotational levels on describing the dynamic processes of this laser. The calculated pulse waveforms based on the vibro-rotational model are in good agreement with the experiment. Laser pulse waveform at the pulse repetition of 740 Hz (1 µs/div).

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“…This is well within the capability of the laser described in Ref. 21. Furthermore, it is pointed out in RKJ's paper that the pulse saturates the E3P-EI transition, and this implies that the stimulated transition rate r s is comparable to, or larger than the inverse of the time duration of the pulse and the deactivation rate of the levels by collisions.…”

Section: Comparison With Experiments and Interpretation Of The Rhodesmentioning

confidence: 73%

Radiative and Collisional Transitions between Coupled Vibrational Modes of CO2

Seeber

1971

The Journal of Chemical Physics

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Each of the two energy levels of CO2 at 1388 and 1285 cm−1 is an equal mixture of doubly excited bending mode and singly excited symmetric stretch mode. The collision numbers of these levels for CO 2–CO 2 collisions are calculated by using the mixed wavefunctions in conjunction with the SSH theory that has been expanded to include two-quantum transitions. This relaxation is shown to take place via various near resonant V-V processes at transition rates of the order of 10 4 sec −1 · torr−1. In particular, direct de-excitation of the lower laser level via singly excited bending mode is shown to be important. An explanation is given for transitions that involve a change of the vibrational angular momentum l, by Δ l = ± 2. Three independent experiments have measured rates in reasonable agreement with those calculated here Quite striking is the substantial disagreement between these three experiments on the one hand and the published interpretation of the Rhodes—Kelly—Javan (RKJ) experiment on the other. To resolve this discrepancy, the RKJ experiment is analyzed in detail, and a new interpretation is given that explains one of the observed transient effects as caused by stimulated two-photon processes and the other by rotational relaxation of the upper laser level.

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Q SWITCHING OF MOLECULAR LASER TRANSITIONS

Cited by 63 publications

References 3 publications

Ion chemistry of the stratosphere

Ion chemistry of the stratosphere

Effect of non-lasing vibro-rotational levels on the dynamics of the Q-switched CO₂ laser

Radiative and Collisional Transitions between Coupled Vibrational Modes of CO2

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Q SWITCHING OF MOLECULAR LASER TRANSITIONS

Cited by 63 publications

References 3 publications

Ion chemistry of the stratosphere

Ion chemistry of the stratosphere

Effect of non-lasing vibro-rotational levels on the dynamics of the Q-switched CO2 laser

Radiative and Collisional Transitions between Coupled Vibrational Modes of CO2

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Product

Resources

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Effect of non-lasing vibro-rotational levels on the dynamics of the Q-switched CO₂ laser