Simultaneous Q-switching and mode-locking (QML) pulse operation is demonstrated by using an in-fiber acousto-optic bandpass modulator (AOBM). The AOBM exhibits a high rejection efficiency of 28 dB for the non-resonant wavelengths, a broad modulation bandwidth of 0.9 nm, a modulation depth of 0.74 and easy implementation in an allfiber device. The effectiveness of the modulator is demonstrated in a rig cavity, mode locking is achieved by amplitude modulation of the transmitted light and matching the modulation period with the cavity round-trip time, simultaneously, the Q factor of the cavity is controlled by superimposing a rectangular wave modulation on the acoustic signal, with variable frequency and duty cycle, allowing a QML pulse operation. Experimental results demonstrate stable QML operation at 0.5 kHz repetition rate. A maximum energy of 1.4 μJ was achieved within a burst of 110 ps mode-locked sub-pulses contained in a 6.4 μs Q-switched envelope. These results demonstrate the potential of the AOBM to perform the double function of active mode locker and Q-switching device in an all-fiber laser.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.