Closed-form expressions for the gain in three- and four-level laser fibers
- Edward L. Ginzton Lab., W.W. Hansen Lab. of Physics, Stanford Univ., Stanford, CA (US)
Exact and approximate theoretical models of the small-signal single-pass gain in single-mode three-level laser fibers are presented, relevant to the behavior of rare-earth-doped (in particular Er{sup 3+}) silica-based fibers. These models account for the effects of both the pump and signal-mode structures and pump excited-state absorption (ESA), the latter being present for some pump wavelengths in Er-doped silica fibers. By relying on the modal overlap integral formalism introduced earlier for four-level lasers, relatively simple closed-form expressions for the pump absorption and the gain are derived. These expressions are also applicable to four-level laser fibers by a simple adjustment of some of the model parameters.
- OSTI ID:
- 5771616
- Journal Information:
- IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (USA), Vol. 26:10; ISSN 0018-9197
- Country of Publication:
- United States
- Language:
- English
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