Abstract
Co-doped fiber lasers have recently shown a wide range of novel capabilities from vector soliton formation1 to DBR cw lasing.2 Efficient energy transfer between the Yb and Er enables one to design a low-threshold, compact fiber laser. The dramatically reduced cavity length enables entirely new regimes of fiber laser operation. In fact, the ideal, quantum single-mode laser theory suggests that due to non linearities in the pump process, the low frequency intensity noise can potentially drop below shot noise under certain driving conditions.3 Our experiments on the low frequency intensity noise have revealed an anomalous polarization dependent resonance that may be evidence of coherent effects between Zeeman sublevels in the Erbium lasing transition.
© 2001 Optical Society of America
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