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FREQUENCE EMISSION LASER [3 records]
Record 1 - internal organization data 1989-03-23
Record 1, English
Record 1, Subject field(s)
- Lasers and Masers
Record 1, Main entry term, English
- tunable laser
1, record 1, English, tunable%20laser
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
A laser in which the frequency of the output radiation can be tuned over part or all of the ultraviolet, visible, and infrared regions of the spectrum 2, record 1, English, - tunable%20laser
Record number: 1, Textual support number: 1 CONT
Use of tunable lasers. The sharpness of the frequency and the high power per unit solid angle and unit spectral bandpass in a laser beam make it attractive for infrared spectroscopy at ultrahigh resolution. The main problem is the tuning of the laser frequency, that is, varying some parameter in the laser system so that its frequency may be varied continuously and accurately. 3, record 1, English, - tunable%20laser
Record 1, French
Record 1, Domaine(s)
- Masers et lasers
Record 1, Main entry term, French
- laser accordable
1, record 1, French, laser%20accordable
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
laser à longueur d’onde réglable. 2, record 1, French, - laser%20accordable
Record number: 1, Textual support number: 1 CONT
Le développement récent des lasers accordables(dont on peut régler la fréquence d’émission) ouvre les perspectives d’une photochimie sélective par laser permettant une meilleure compréhension des mécanismes des réactions chimiques. 3, record 1, French, - laser%20accordable
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 1988-03-16
Record 2, English
Record 2, Subject field(s)
- Lasers and Masers
Record 2, Main entry term, English
- laser output frequency
1, record 2, English, laser%20output%20frequency
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, French
Record 2, Domaine(s)
- Masers et lasers
Record 2, Main entry term, French
- fréquence de sortie du laser
1, record 2, French, fr%C3%A9quence%20de%20sortie%20du%20laser
correct, feminine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
- fréquence d'émission laser 1, record 2, French, fr%C3%A9quence%20d%27%C3%A9mission%20laser
correct, feminine noun
Record 2, Textual support, French
Record 2, Spanish
Record 2, Textual support, Spanish
Record 3 - internal organization data 1985-05-01
Record 3, English
Record 3, Subject field(s)
- Quantum Statistics
- Radio Waves
- Lasers and Masers
Record 3, Main entry term, English
- coherent radiation
1, record 3, English, coherent%20radiation
correct
Record 3, Abbreviations, English
Record 3, Synonyms, English
Record 3, Textual support, English
Record number: 3, Textual support number: 1 DEF
A form of radiation in which definite phase relationships exist between radiation at different positions in a cross section of the radiant beam. 2, record 3, English, - coherent%20radiation
Record number: 3, Textual support number: 1 OBS
Single-frequency energy such that there is reinforcement when portions of a signal coincide in phase and cancellation when they are in phase opposition. 2, record 3, English, - coherent%20radiation
Record 3, French
Record 3, Domaine(s)
- Statistique quantique
- Ondes radioélectriques
- Masers et lasers
Record 3, Main entry term, French
- rayonnement cohérent
1, record 3, French, rayonnement%20coh%C3%A9rent
correct, masculine noun
Record 3, Abbreviations, French
Record 3, Synonyms, French
Record 3, Textual support, French
Record number: 3, Textual support number: 1 OBS
cohérence. Aptitude d’un rayonnement [...] à engendrer, sous certaines conditions, des phénomènes d’interférences. 1, record 3, French, - rayonnement%20coh%C3%A9rent
Record number: 3, Textual support number: 2 OBS
Le rayonnement non cohérent est celui qu'on obtient, par exemple, du filament d’une lampe à incandescence. Lorsque le filament est chaud, ses atomes sont fortement excités et ils émettent des photons que l'on perçoit comme de la lumière et de la chaleur. L'émission de photons obtenue par ce moyen est aléatoire et cela produit des rayonnements sur une large bande de fréquences qui ne sont pas synchronisées les unes avec les autres. Par contre, le laser émet un rayonnement dit cohérent parce que ce rayonnement naît d’une oscillation stimulée, c'est-à-dire provoquée par une impulsion de déclenchement. Il en résulte une fréquence unique(monochrome) à partir de laquelle on peut obtenir des composantes synchrones. 2, record 3, French, - rayonnement%20coh%C3%A9rent
Record number: 3, Textual support number: 3 OBS
La notion du rayonnement cohérent n’est pas limitée aux seuls rayonnements visibles; théoriquement, elle peut s’appliquer à l’ensemble des rayonnements électromagnétiques. 2, record 3, French, - rayonnement%20coh%C3%A9rent
Record 3, Spanish
Record 3, Textual support, Spanish
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