A figure-8 laser is a fiber laser with a figure-8-shaped ring resonator. It is used for making pico- and femtosecond soliton pulses. The typical spectrum of such a laser consists of a wide central peak and a few narrow lateral peaks that are placed symmetrically around it. The amplitudes of the narrow peaks are the same as or less than that of the central peak.[1]
Both loops of the resonator work as Sagnac loops. The active medium of the laser is optical fiber with its core doped with rare-earth ions. It is placed asymmetrically with respect to the resonator loops to make a nonlinear difference in phase between opposite waves, ensuring mode locking.[2] In 1992 a figure-8 laser was built with a smaller loop length of 1.6 m and a larger loop length of 60.8 m for generation of 315 fs pulses with repetition rate 125 MHz.[3]
See also
Ring resonator
References
Fermann et al. 2002, pp. 102—103.
Agrawal 2008, pp. 181—182.
Agrawal 2008, p. 215.
Literature
Agrawal G. P. (2008). Applications of nonlinear fiber optics. Optics and Photonis Series. 10 (2nd ed.). Academic Press. p. 508. ISBN 978-0-12-374302-2.
M. E. Fermann; A. Galvanauskas; G. Sucha, eds. (2002). Ultrafast Lasers: Technology and Applications. CRC Press. p. 800. ISBN 978-0-8247-4349-9.
External links
"Mode-locked Fiber Lasers: 1.5-μm Femtosecond Erbium Fiber Lasers". Encyclopedia of Laser Physics and Technology. RP Photonics. Retrieved 2011-08-12.
M. K. Islam & P. L. Chu. "Stability Analysis of Mode Locked Figure-eight Fiber Laser" (PDF). Progress In Electromagnetics Research Symposium. Retrieved 2011-08-13.
vte
N-doped Si.svg Solid-state lasers
Distinct subtypes
Semiconductor laser
Yttrium aluminium garnet
Nd:YAG laser Er:YAG laser Nd:Cr:YAG Yb:YAG Nd:Ce:YAG Ho:YAG Dy:YAG Sm:YAG Tb:YAG Ce:YAG Ce:Gd:YAG Gd:YAG
Glass
Nd:glass Ytterbium glass 147Pm+3:Glass Er:Yb:Glass
Other gain media
Ruby laser Yttrium iron garnet (YIG) Terbium gallium garnet (TGG) Ti:sapphire laser Solid-state dye laser (SSDL/SSOL/SSDPL) Yttrium lithium fluoride (YLF)
Neodymium-doped yttrium lithium fluoride (Nd:YLF) Yttrium orthovanadate (YVO4)
Neodymium-doped yttrium orthovanadate (Nd:YVO4) Yttrium calcium oxoborate (YCOB)
Nd:YCOB laser Ce:LiSAF Ce:LiCAF Cr:ZnSe U:CaF2 Sm:CaF2 Yb:SFAP
Structures
Diode-pumped solid-state laser (DPSSL) Fiber laser Figure-8 laser Disk laser F-center laser
Specific lasers
Trident laser ZEUS-HLONS (HMMWV Laser Ordnance Neutralization System) Nova (laser) Cyclops laser Janus laser Argus laser Shiva laser HiPER Laboratory for Laser Energetics Laser Mégajoule LULI2000 Mercury laser ISKRA-6 Vulcan laser
Aspects
Mode-locking Energy transfer upconversion Solar-pumped laser
Laser types: Solid-state
Semiconductor Dye Gas
Chemical Excimer Ion Metal Vapor
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