Title :
Thermal effects in kilowatt fiber lasers
Author :
Wang, Yong ; Xu, Chang-Qing ; Po, Hong
Author_Institution :
Dept. of Eng. Phys., McMaster Univ., Hamilton, Ont., Canada
Abstract :
Thermal effects and their influences on kilowatt ytterbium-doped double-clad (YDDC) fiber lasers are studied through numerical modeling. Solutions to suppress the thermal effects in the YDDC fiber lasers under bidirectional end pump and distributed pump are presented and compared for the first time. It is shown that lower operating temperature and more uniform heat dissipation in fibers can be obtained by optimizing the arrangement of pump powers, pump absorption coefficients, and fiber lengths.
Keywords :
absorption coefficients; cooling; fibre lasers; laser theory; optical pumping; thermo-optical effects; ytterbium; bidirectional end pump; distributed pump; fiber lengths; kilowatt fiber lasers; kilowatt ytterbium-doped double-clad fiber lasers; lower operating temperature; numerical modeling; pump absorption coefficients; pump powers; thermal effects; uniform heat dissipation; Absorption; Fiber lasers; Gas lasers; Laser excitation; Laser modes; Laser theory; Numerical models; Optical fiber couplers; Power lasers; Pump lasers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2003.818913
