Yu Jin, Meng Hongxiang, Jieng Yu. Influence of Finite Lower-level Lifetime on the Performance in CW Four level Laser[J]. Editorial Office of Optics and Precision Engineering, 1997,(3): 7-11
Yu Jin, Meng Hongxiang, Jieng Yu. Influence of Finite Lower-level Lifetime on the Performance in CW Four level Laser[J]. Editorial Office of Optics and Precision Engineering, 1997,(3): 7-11DOI:
The rate equations for a continuous four-level laser are solved in this letter
taking into account the finite lower-level lifetime and the crystal field splitting of the laser levels. It is shown that the existence of this finite lower-level lifetime raises the threshold
nonlinearizes the in-and-out relationship and acts as an ultimate role in limiting the achievable output power for a four-level laser
instead of the ideal case of infinite achievable power while the relaxation from the lower-level is regarded as instantaneous.