Resonant degenerate four-wave mixing in I2: Effect of buffer gas pressure

Barker, Peter, Thomas, Amberyn, Rubinsztein-Dunlop, Halina, Axner, Ove and Chekalin, Nikolai (1995) Resonant degenerate four-wave mixing in I2: Effect of buffer gas pressure. Applied Optics, 34 18: 3281-3289. doi:10.1364/AO.34.003281


Author Barker, Peter
Thomas, Amberyn
Rubinsztein-Dunlop, Halina
Axner, Ove
Chekalin, Nikolai
Title Resonant degenerate four-wave mixing in I2: Effect of buffer gas pressure
Formatted title
Resonant degenerate four-wave mixing in I2: Effect of buffer gas pressure
Journal name Applied Optics   Check publisher's open access policy
ISSN 0003-6935
2155-3165
Publication date 1995-06
Sub-type Article (original research)
DOI 10.1364/AO.34.003281
Volume 34
Issue 18
Start page 3281
End page 3289
Total pages 9
Place of publication Washington, DC, United States
Publisher Optical Society of America
Language eng
Formatted abstract
The influence of molecular collisions on the production of the degenerate four-wave mixing signal in I2 is presented. Measurements were performed on gaseous molecular iodine, I2, contained in a glass cell in which pressure, temperature, and species concentration are easily and independently varied. Frequencydoubled outputs from a seeded Nd:YAG laser and an excimer-pumped dye laser were used as excitation sources. We have studied the dependence of signal strength versus buffer gas pressure, with pump intensity as a third parameter. It is evident from our results that, for pump intensities of less than 1 MW/cm2, the pressure dependence of the signal follows that given by a simple two-level model in the homogeneously broadened regime. In this regime collisional deexcitation becomes significant, leading to changes in saturation intensity. This is evidenced by a reduction in the signal with an increase in buffer gas pressure. This behavior is similar to that seen in laser-induced fluorescence. At higher pump intensities, the signal is seen to increase with pressure; this behavior cannot be described by the simple two-level model
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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