Title :
Modeling and optimization of high-power Nd/sup 3+/-Yb/sup 3+/ codoped fiber lasers
Author :
Yahel, Eldad ; Hess, Ortwin ; Hardy, Amos A.
Author_Institution :
Adv. Technol. Inst., Univ. of Surrey Guildford
fDate :
3/1/2006 12:00:00 AM
Abstract :
High-power continuous-wave Nd3+-Yb3+ codoped fiber lasers (NYDFL) are analyzed, based on a rate-propagation equations model. The model takes into account energy transfer between Nd3+ and Yb3+, as well as cross relaxation between Nd3+ ions, and contributions from high-order modes to the amplified spontaneous emission (ASE). Examples of cladding-pumped NYDFLs with distributed Bragg reflector (DBR) at either end are presented. We demonstrate the optimal laser design by considering the effects of the Nd3+ and Yb3+ concentrations, pump wavelengths multiplexing, output mirror reflectivity, and the laser wavelength. Approximate quasi-analytical solutions are shown to be in good agreement with the exact numerical solutions of the rate equations for practical conditions
Keywords :
distributed Bragg reflector lasers; doping profiles; fibre lasers; laser modes; neodymium; optical design techniques; optical pumping; reflectivity; superradiance; ytterbium; ASE; Nd3+-Yb3+ codoped fiber lasers; amplified spontaneous emission; cladding pumping; cross relaxation; distributed Bragg reflector; energy transfer; ion concentration; output mirror reflectivity; pump wavelengths multiplexing; rate-propagation equations model; Distributed Bragg reflectors; Energy exchange; Equations; Fiber lasers; Laser excitation; Laser modes; Neodymium; Optical design; Pump lasers; Spontaneous emission; Distributed Bragg reflector (DBR) lasers; Neodymium (Nd); Ytterbium (Yb); optical fiber lasers; optical fiber theory;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2005.863324
