<i>Q</i> SWITCHING AND MODE LOCKING OF A CF3I PHOTOLYSIS LASER

Ferrar, C.

doi:10.1063/1.1651864

Cited by 30 publications

(13 citation statements)

References 5 publications

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“…It is thus appropriate to explore avenues which may facilitate construction and/ or utilization of a large HF system. Optical absorbers in the HF spectral region, about 2.5 to 4 /-1m, can be used for two basically different jobs: (1) in low gain systems, absorbers can be used to introduce frequency selective loss within a laser cavity and. hence, control spectral distribution of laser output; and (2) saturable or bleachable absorbers can be used as fastacting shutters.…”

Section: Use Of Optical Absorbers With Hf Lasersmentioning

confidence: 99%

“…hence, control spectral distribution of laser output; and (2) saturable or bleachable absorbers can be used as fastacting shutters. By way of introduction, we indicate why (1) and (2) are useful applications in the HF system. HF lasers typically radiate energy at many wavelengths in a complicated spectrum.…”

Section: Use Of Optical Absorbers With Hf Lasersmentioning

confidence: 99%

“…A laser that satisfies the criteria for the laser-fusion power plant has probably not yet been discovered; and, if it has been discovered, it certainly has not been demonstrated as possessing all the required characteristics. The near-term goals of our program are: (1) to identify lasers that can be useful for near-term and for long-term laser-fusion applications, (2) to increase the peak-power capability and efficiency of existing lasers, and (3) to develop the technology to increase the repetition rate and reliability of highpower lasers.…”

Section: Introductionmentioning

confidence: 99%

“…Peak electrical efficiencies greater than 1800/0 and peak chemical efficiencies greater than 110/0 were realized in this electronbeam-excited HF-Iaser study. During the next report period, our HF-Iaser program will emphasize: (1) an accurate evaluation of the laser beam quality that can be obtained with the HF laser, (2) an evaluation of schemes to shorten the pulse width to about 1 ns, (3) development of technology to improve system reliability, and (4) evaluation of the prospects of fast-repetitionrate operation.…”

Section: Introductionmentioning

confidence: 99%

“…A short-pulse oscillator that produces pulses as short as 160 ps (FWHM) also became operational. During the next report period, we will: (1) determine the maximum efficiency of this laser using standard flashlamps as pump sources, (2) evaluate energy extraction, (3) evaluate pulse distortion, and (4) evaluate the effect of anomalous dispersion ()n beam quality under saturated-gain conditions. Later experiments will focus on improving the efficiency of the laser and on increasing the pulse-repetition rate.…”

Section: Introductionmentioning

confidence: 99%

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Laser-fusion research progress report, January--December 1975

1976

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Section: Use Of Optical Absorbers With Hf Lasersmentioning

confidence: 99%

Section: Use Of Optical Absorbers With Hf Lasersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Laser-fusion research progress report, January--December 1975

1976

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Chemical Lasers

Kompa¹

1970

Angew. Chem. Int. Ed. Engl.

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bond is formed during the reaction. The synthesis should provide a route to substituted 2-amino 1alcohols, since 2-oxazolines are readily hydrolyzed in acidic mediaC781. A synthesis of 2-amino l-alcohols that allows wide scope for variation of the substituents on the carbon is of great interest, since many substances of this class are biologically active. In this connection, mention should be made of the 4-ethoxycarbonyl-2-oxazolines (cf. Table 4, last three lines), which can be obtained from ethyl u-isocyanoacetate or-propionate and aldehydes in ethanol with sodium cyanide as catalyst. Their hydrolysis in aqueous ethanol with a little triethylamine affords ethyl esters of N-formylserine and derivatives substituted in the a-or ?-position [731. Oxazoles from a-Metalated Isocyanides and Acylating AgentsOn addition of benzoyl chloride to a suspension of ethyl lithioisocyanoacetate (59a) in tetrahydrofuran at -70°C followed by acidic working up, 4ethoxycarbonyl-5-phenyloxazole (69) can be isolated in a yield of about 80%[741. This synthesis probably proceeds via the P-keto isocyanide (68), which enolizes and cyclizes during working up [801. 5-Phenyloxazole (69) is obtained by reaction of isocyanomethyllithium (51a) with N-rnethylbenzanilide and addition of methanol before working up 1641. Similarly, the oxazole (69) can be obtained in a yieldChemical lasers are based on the new principle of obtaining energy in the form of coherent radiation from chemical reactions, Since the discovery of the $rst laser of this type in 1965, laser emission has been investigated in a considerable number of fast gasphase reactions. In physical chemistry such lasers provide a diagnostic tool for the detailed investigation of the energy distribution in elementary reactions. The barrier to technological use has probably also been overcome by the recent continuous operation of a chemical hydrogen fluoride laser. An attempt is made in the present article to trace the development of this still youthful jield and to demonstrate the possibilities and limitations of the generation of energy with chemical lasers.Besides the well-known methods of energy production by chemical means, such as are used for heating. -, . _

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Chemische Laser

Kompa

1970

Chemie Ingenieur Technik

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Chemische Laser beruhen auf dem neuen Prinzip der Gewinnung von Energie in der Form koharenter Strahlung aus chemischen Reaktionsprozessen. Seit der Ent,deckung des ersten Lasers dieses Typs 1965 ist Laser-Emission in einer groBeren Zahl schneller Gasphasenreaktionen untersucht worden. I m Bereich der physikalischen Chemie bietet sich damit ein diagnostisches Werkzeug zur detaillierten Erforschung der Energievert,eilung in don betreffenden Reaktionen. Dariiber hinaus diirfte mit dem kiirzlich gelungenen Betrieb eines chemischen Fluorwasserstoff-Lasers im Dauerstrich auch die Schwelle zur t,echnischen Verwert,barkeit iiberschritten worden sein. Der Beitrag versucht, die Entwicklung dieses noch jungen Arbeitsgebietes sowie Moglichkeiten und Grenzen der Energieerzeugung mit chemischen Lasern aufzuzeigen. Neben die bekannten Moglichkeiten der Energieerzeugung auf chemischem Wege, wie sie zu Heizungs-, Beleuchtungs-, Antriebszwecken u. a. benut,zt werden, ist seit 1065 ein neues Prinzip chemischer Energiegewinnung getreten, namlich die Reakt,ionswarme chemischer Reaktionen ganz oder teilweise als stimuliert,e Emission eines oder mehrerer Reaktionsprodukte freizusetzen. Solche Reaktionssysteme heiBen chemische Laser, weil die Anregungsenergie der Molekiile, die als Laser-Emission in Erscheinung tritt, einer chemischen Reaktion entstammt. Der Laser wird also chemisch gepumpt. Veranschaulichen la13t sich dieses Prinzip am bssten an einem konkreten Beispiel. Bei der exothermen Umsetzung eines Fluor-Atoms mit einem Wasserstoff-Molekul unter Bildung von Fluorwasserstoff F + Hz -+ HF + H (1) (Aktivierungsenergie E A = 1,7 kcal, Reaktionsenthalpie d H = -31,6 kcal/mol) werden 33,3 kcal/mol freigesetzt. Dieser Energiebetrag kann sich iiber die Freiheitsgrade der Translation (Etrans.) von H F rind H verteilen sowie Erweiterte Fassung eines Vortrages bei der GDCh-Hauptversammlung, 15. bis 20. Sept. 1969 in Hamburg. zur Anregung von Rotatmion (Er,t.) und Schwingung ( E v i b . ) des Fluorwasserstoff-Molekuls fiihren. Eine elektronische Anregung der Reaktionsprodukte erfordert weit groBere Energiebetrage und ist hier nicht moglich. Die Gesamtenergie des Fluorwasserstoffes ist mithin E = E v i b . + Erot. + Etrans. -Solange thermisches Gleichgewicht vorliegt, ist die Konzentration an angeregten Molekiilen durch die Boltzmann-Beziehung gegeben :

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Q SWITCHING AND MODE LOCKING OF A CF3I PHOTOLYSIS LASER

Cited by 30 publications

References 5 publications

Laser-fusion research progress report, January--December 1975

Laser-fusion research progress report, January--December 1975

Chemical Lasers

Chemische Laser

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