Abstract
A bismuth-doped germanosilicate fiber laser was experimentally demonstrated to engage in self-Q-switched mode-locking at a wavelength of 1470 nm. Mode-locked pulse bursts were generated from a ring cavity without using a saturable absorber when the cavity length was properly adjusted. At a cavity length of 65 m, repetition rates of ∼31.5 kHz and ∼3.088 MHz and temporal widths of ∼4.7 μs and ∼1.2 ns were measured for the Q-switching envelopes and mode-locked pulses under the Q-switching envelopes, respectively. The laser operating regime was observed to change from Q-switching to Q-switched mode-locking as cavity length increases by adding a segment of anomalously dispersive fiber. The output pulse characteristics such as pulse width and repetition rate of the Q-switching envelopes and mode-locked pulses were also investigated with respect to the cavity length.
Original language | English |
---|---|
Article number | 125102 |
Journal | Laser Physics Letters |
Volume | 11 |
Issue number | 12 |
DOIs | |
State | Published - 1 Dec 2014 |
Keywords
- Q-switching
- bismuth-doped fiber
- fiber lasers
- germanosilicate fiber
- mode-looking