For pulsed fiber amplifiers with repetition rate of tens of kHz, inter-pulse amplified spontaneous emission (ASE) is easy to build up and makes it difficult to amplify the weak signal effectively. Besides, amplified pulse shape of several tens of nanosecond would distort because of the dynamic gain saturation effect. In this paper, we demonstrate a polarization-maintained fiber laser system with three-stage amplifiers delivering pulse energy up to 70 μJ. The whole system is seeded by a semiconductor diode laser with central wavelength of 1063.9 nm and pulse repetition rate of 10 kHz which is driven directly by an arbitrary waveform electrical signal. We experimentally optimized the gain fiber length of the first-stage amplifier based on the reabsorption effect. The signal amplification efficiency and ASE proportion with different pump schemes in the first amplifier were investigated and compared in detail. Finally, an amplified pulse with 70 μJ energy accompanying with serious shape distortion was experimentally demonstrated. The signal to ASE ratio is as high as 54 dB from spectrum and the overall energy gain is 30 dB. Furthermore, a rectangular pulse with energy of 50 μJ was achieved by pre-compensating the shape distortion using the stochastic parallel gradient descent (SPGD) algorithm and the total energy gain is 28.5 dB.
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.