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Proceedings Paper

Mode-locked fiber laser using the Sagnac interferometer and nonlinear polarization rotation
Author(s): Baldeamr Ibarra-Escamilla; Evgueni Anatolevich Kuzin; Joseph W. Haus; Olivier Pottiez; Dario E. Gomez-Garcia; Francisco Gutierrez-Zainos; Sergio Mendoza-Vazquez; Ruben Grajales-Coutico
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Paper Abstract

In figure-eight lasers (F8L) mode locking is achieved through a nonlinear fiber amplifier loop mirror (NALM) or an asymmetrical nonlinear optical loop mirror (NOLM). Recently, we have theoretically shown that the symmetrical NOLM with a twisted fiber is useful for passive mode locking of fiber lasers. In this work we experimentally demonstrate the operation of a F8L based on the symmetrical NOLM with a twisted low-birefringence fiber in the loop. The modelocking operation is achieved by nonlinear polarization rotation. We found that the counter-propagating beams accumulate a differential nonlinear phase shift when they have different As (where As is the Stokes parameter). At the input NOLM, we used a polarizer controller to adjust the clockwise beam to be circularly polarized, As=1. In the loop of the NOLM, we used a quarter-wave retarder to transform the counter-clockwise beam to linear polarization, As=0. The quarter-wave retarder was the only element that we adjust to achieve modelocking. The pulse repetition frequency was 0.8 MHz. The FWHM of the autocorrelation function was 0.7 ps. We used a pump power of 80 mW to get the modelocking operation. The modelocked laser ran in stable operation for hours. Even in this first experiments the laser shown several advantages. The adjustment procedure was straightforward. The laser shows stable operation and exhibits high pulse energy. We achieved stable generation of subpicosecond pulses with milliwatts of average output power.

Paper Details

Date Published: 3 July 2003
PDF: 10 pages
Proc. SPIE 4974, Advances in Fiber Lasers, (3 July 2003); doi: 10.1117/12.478269
Show Author Affiliations
Baldeamr Ibarra-Escamilla, Instituto Nacional de Astrofisica Optica y Electronica (Mexico)
Evgueni Anatolevich Kuzin, Instituto Nacional de Astrofisica Optica y Electronica (Mexico)
Joseph W. Haus, Univ. of Dayton (United States)
Olivier Pottiez, Instituto Nacional de Astrofisica Optica y Electronica (Mexico)
Dario E. Gomez-Garcia, Instituto Nacional de Astrofisica Optica y Electronica (Mexico)
Francisco Gutierrez-Zainos, Instituto Nacional de Astrofisica Optica y Electronica (Mexico)
Sergio Mendoza-Vazquez, Instituto Nacional de Astrofisica Optica y Electronica (Mexico)
Ruben Grajales-Coutico, Instituto Nacional de Astrofisica Optica y Electronica (Mexico)


Published in SPIE Proceedings Vol. 4974:
Advances in Fiber Lasers
L. N. Durvasula, Editor(s)

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