Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10155652 | Optics Communications | 2019 | 6 Pages |
Abstract
An actively mode-locked laser (AMLL) is subjected to RF modulation frequency detuning away from its fundamental resonant frequency. The standard theoretical model of mode-locked lasers is extended with perturbative analysis and injection locking theory. The proposed model shows that with increasing detuning, the number of modes with phase-lock decreases. For a mode n, the injection range Rn is found to decrease as nâ1, thus making higher modes more susceptible to unlocking by RF detuning. Experimental verification of these theoretical predictions is obtained by using a custom built Yb 3+ doped fiber based ring AMLL. The AMLL operates at 1064nm, with a repetition rate of f0=26.69MHz. The unlocking of modes is studied in the electrical domain by varying the RF detuning over a range of ±13kHz with a step-size of 130Hz. The locking limits of a mode decrease as nâ1 as predicted by the theory. The fundamental mode (n=1) has an injection range of 143.4kHz, with the higher modes, n>1, having smaller injection ranges as predicted by the theory.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
S. Krishnamoorthy, A. Prabhakar,