Effect of the solvent viscosity on the local irregular intensity fluctuations in high Fresnel number dye lasers

• Published in: IEEE journal of quantum electronics Vol. 35; no. 1; pp. 1 - 6
• Main Authors: Calderon, O.G., Leyva, I., Guerra, J.M.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.01.1999; Institute of Electrical and Electronics Engineers
• Subjects: Amplitudes; Dye lasers; Dyes; Exact sciences and technology; Fluctuation; Fluctuations; Fundamental areas of phenomenology (including applications); Laser excitation; Laser feedback; Laser modes; Laser theory; Lasers; Mathematical analysis; Optical feedback; Optical polarization; Optics; Orientation; Physics; Pump lasers; Solvents; Viscosity; Viscosity; Molecular orientation; Theoretical study; Dye lasers; Optical pumping; Experimental study; Solvent effects
• ISSN: 0018-9197; 1558-1713
• DOI: 10.1109/3.737611

We study the influence of the solvent viscosity in the local irregular intensity fluctuations characteristic of high Fresnel number dye lasers. The relative amplitude of the fluctuations in a flashlamp-pumped dye laser is analyzed, We complete our previous work by using several solvents and different excitation energies above threshold. A decrease of the relative fluctuation amplitude is found as the solvent viscosity or the pumping energy increases. This effect is theoretically analyzed in the framework of the semiclassical Maxwell-Bloch equations, with a model based on the orientation of the dye molecules driven by the laser field in the solvent. These results point out the importance of the orientation of the dye molecules in the intensity fluctuation phenomenon.