Hybrid and Passive Mode Locking in Coupled-Cavity Lasers
The idea of exploiting a coupled-cavity configuration for improved active mode-locking was first reported for linear external cavities (1–3). With the low-gain He-Ne lasers involved there was an obvious practical advantage in minimising insertion loss by siting the relevant modulator in the external cavity. The alternative concept of exploiting an optical nonlinearity in an external coupled cavity was first described by Mollenauer and co-workers in respect of the soliton laser (4,5). Subsequent experimental (6–10) and theoretical (11) studies then showed that the generation of bright optical solitons was not necessary to achieve enhanced mode-locking using nonlinear coupled cavities.
KeywordsArgon Soliton Autocorrelation
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