Stimulated collision induced processes in sodium vapor in the presence of helium

Konefal, Z.; Ignaciuk, M.

doi:10.1007/bf00325049

Cited by 16 publications

(5 citation statements)

References 7 publications

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“…The intensity of the ASE and SRS signals depends not only on the buffer gas pressure but also on the laser exciting intensity, detuning and sodium vapour pressure [4].…”

Section: Results and Interpretationmentioning

confidence: 99%

“…The experiments involved irradiating a 15 cm column of sodium vapour, contained in a Pyrex cell working in a heat-pipe system [4]. Noble gases were admitted to the cell at pressures in the range 200-600 Torr.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The production of ASE on the transition 32p1/2--32S1/2 and SRS with the 32P~/2 -3 2P3/2 transition in a mixture of sodium vapour with helium was first reported in [3] and examined in detail in [4]. These two effects strongly depend on the collisions of the excited sodium atoms with the buffer gas.…”

Section: Introductionmentioning

confidence: 96%

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Observation of collision-induced amplified emission in Na-noble gas system

Konefal

Ignaciuk

1993

Z Phys D - Atoms, Molecules and Clusters

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Abstract.A stimulated resonance emission and stimulated Raman scattering signals have been generated in an atomic sodium and rare gas mixture by a laser tuned to the 32 Sin-32 P3/2 transition. The intensity dependence of these effects on the buffer gas pressures is obtained in the experiment. We demonstrate good qualitative agreement between experimental observations and a simple theoretical model. A new method using stimulated emission is applied to measure the cross section for the J mixing of 3P states of sodium due to collisions with noble gas atoms. Good agreement between our results and the measurements of Pitre and Krause is obtained for Ar and Kr perturbers PACS: 32.80.Wr; 32.90. +a

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“…The intensity of the ASE and SRS signals depends not only on the buffer gas pressure but also on the laser exciting intensity, detuning and sodium vapour pressure [4].…”

Section: Results and Interpretationmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Observation of collision-induced amplified emission in Na-noble gas system

Konefal

Ignaciuk

1993

Z Phys D - Atoms, Molecules and Clusters

Self Cite

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“…The collisional energy transfer mechanism is employed in CO 2 lasers, for example, where helium atoms are introduced, to increase the efficiency of the CO 2 lasing process. In atomic alkali metal vapors, the emission is amplified through mixing with helium [45][46][47] to utilize collisional energy transfer for increasing the lasing output.…”

Section: Discussionmentioning

confidence: 99%

Collision Enhanced Raman Scattering (CERS): An Ultra-High Efficient Raman Enhancement Technique for Hollow Core Photonic Crystal Fiber Based Raman Spectroscopy Gas Analyzer

Shirmohammad,

Short,

Zeng

2023

Biosensors

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Raman enhancement techniques are essential for gas analysis to increase the detection sensitivity of a Raman spectroscopy system. We have developed an efficient Raman enhancement technique called the collision-enhanced Raman scattering (CERS), where the active Raman gas as the analyte is mixed with a buffer gas inside the hollow-core photonic-crystal fiber (HCPCF) of a fiber-enhanced Raman spectroscopy (FERS) system. This results in an enhanced Raman signal from the analyte gas. In this study, we first showed that the intensity of the 587 cm−1 stimulated Raman scattering (SRS) peak of H2 confined in an HCPCF is enhanced by as much as five orders of magnitude by mixing with a buffer gas such as helium or N2. Secondly, we showed that the magnitudes of Raman enhancement depend on the type of buffer gas, with helium being more efficient compared to N2. This makes helium a favorable buffer gas for CERS. Thirdly, we applied CERS for Raman measurements of propene, a metabolically interesting volatile organic compound (VOC) with an association to lung cancer. CERS resulted in a substantial enhancement of propene Raman peaks. In conclusion, the CERS we developed is a simple and efficient Raman-enhancing mechanism for improving gas analysis. It has great potential for application in breath analysis for lung cancer detection.

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“…[5][6][7][8][9][10][11][12][13]. Numerous theoretical and experimental studies of energy transfer, energy levels mixing, and a three-level lasing in alkalis were performed during that time, [14][15][16][17][18][19][20][21][22][23][24][25][26][27] but an absence of powerful enough narrowband tunable pump laser sources did not allow efficient lasing in alkali vapors until the beginning of the new millennium. The first really efficient lasing in pulsed and continuous wave (CW) operation in Rb and Cs vapors was observed in 2003 to 2005, 28,29 using a Ti:sapphire laser for optical pumping.…”

Section: Introductionmentioning

confidence: 99%

Review of alkali laser research and development

2012

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Abstract. In this review we present an analysis of optically pumped alkali laser research and development from the first proposal in 1958 by Schawlow and Townes to the current state. In spite of the long history, real interest in alkali vapor lasers has appeared in the past decade, after the demonstration of really efficient lasing in Rb and Cs vapors in 2003 and the first successful power scaling experiments. This interest was stimulated by the possibility of using efficient diode lasers for optical pumping of the alkali lasers and by the fact that these lasers can produce a high quality and high power output beam from a single aperture. We present a review of the most important achievements in high power alkali laser research and development, discuss some problems existing in this field, and provide future perspectives in diode pumped alkali laser development.

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Stimulated collision induced processes in sodium vapor in the presence of helium

Cited by 16 publications

References 7 publications

Observation of collision-induced amplified emission in Na-noble gas system

Observation of collision-induced amplified emission in Na-noble gas system

Collision Enhanced Raman Scattering (CERS): An Ultra-High Efficient Raman Enhancement Technique for Hollow Core Photonic Crystal Fiber Based Raman Spectroscopy Gas Analyzer

Review of alkali laser research and development

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