VIBRATIONAL AND ROTATIONAL STUDIES USING <i>Q</i> SWITCHING OF MOLECULAR GAS LASERS

Flynn, George W.; Kovacs, Mark A.; Rhodes, C. K.; Javan, A.

doi:10.1063/1.1754485

Cited by 47 publications

(5 citation statements)

References 3 publications

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“…Nitrogen appears to be more efficacious, per torr, than helium, at enhancing rotational relaxation, as suggested by Tychinskii (1967). On the other hand, increasing nitrogen pressure reduces the smallsignal gain markedly and the best compromise for high gain at high powers is the addition of helium This is in accordance with experience on Q-switched oscillators which require high helium pressures at high mirror rotation speeds (Flynn et al 1967).…”

supporting

confidence: 80%

Rotational relaxation and gain saturation in CO2 laser amplifiers

Crafer¹,

Gibson²,

Kimmitt³

1969

J. Phys. D: Appl. Phys.

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Amplifiers are frequently used in conjunction with Q-switched laser oscillators for the generation of high-power pulses. The time dependence of gain saturation in CO2 laser amplifiers has been studied. The rate of change of amplifier gain at power levels near 104 W cm−2 is generally determined by relaxation processes between rotational levels of the 001 and 100 vibrational states. A theoretical model which takes rotational relaxation into account is presented and compared with experimental data on the gain of an amplifier both during and after an oscillator pulse. Good agreement between theory and experiment is obtained, from which an average value of the rotational relaxation time can be deduced. The variation of the rotational relaxation time with partial pressure of helium and nitrogen is also described. The implications of these results in the design of CO2 laser systems to produce high-power pulses are pointed out.

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supporting

confidence: 80%

Rotational relaxation and gain saturation in CO2 laser amplifiers

Crafer¹,

Gibson²,

Kimmitt³

1969

J. Phys. D: Appl. Phys.

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“…It would be difficult to overemphasize the remarkable effect that the invention of powerful pulsed lasers, and their subsequent introduction into the field in 1966, had on the study of vibrational energy transfer. − The laser-based experiments were able for the first time to delineate the mechanism and characteristics of vibration−vibration (V−V) energy exchange in which one molecule loses vibrational energy to an acceptor species, which itself becomes vibrationally excited during a collisional relaxation process. Although such events do not result in complete equilibration of vibrationally hot molecules, they almost always dominate the initial vibrational relaxation of polyatomic molecules.…”

Section: Energy Transfer On the Ground Potential Energy Surface: Lar...mentioning

confidence: 99%

Vibrational Energy Transfer

1996

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Many aspects of the collision dynamics of vibrational energy transfer are presented. Special emphasis is placed on three broad areas within this field: (1) vibrational energy transfer in large molecules (>10 modes) at low excitation, (2) vibrational energy transfer in large molecules at high vibrational excitation, and (3) vibrational energy transfer of highly excited small molecules. Advances in laser methods have revolutionized experimental investigations of all of these areas. Recent results are presented, and directions for the future are discussed.

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“…On peut également tenir compte du terme d'émission spontanée : + SM MJ2 dans [4] et -SM MJ2 dans [5].…”

unclassified

Influence des phénomènes de relaxation sur la forme des impulsions fournies par un laser CO2 déclenché par un absorbant saturable

Dupre

Meyer

1975

Rev. Phys. Appl. (Paris)

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La forme des impulsions laser, fournies par un laser à gaz carbonique déclenché par un absorbant saturable, SF6, a été étudiée expérimentalement ; un modèle théorique du phénomène a été élaboré. Il permet de reconstituer un train d'impulsions laser. Dans les tests effectués sur cette méthode de calcul, l'accent a été mis particulièrement sur le rôle de la relaxation rotationnelle dans l'absorbant

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VIBRATIONAL AND ROTATIONAL STUDIES USING Q SWITCHING OF MOLECULAR GAS LASERS

Cited by 47 publications

References 3 publications

Rotational relaxation and gain saturation in CO2 laser amplifiers

Rotational relaxation and gain saturation in CO2 laser amplifiers

Vibrational Energy Transfer

Influence des phénomènes de relaxation sur la forme des impulsions fournies par un laser CO2 déclenché par un absorbant saturable

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