We developed a high power picosecond laser system at 80 MHz for third harmonic generation. We obtained 291 W at
1030 nm under 580 W of pump power at 976 nm from an all fiber master oscillator power amplifier based on rod-type
fibers. By frequency tripling, we obtained 63 W at 343 nm with excellent beam quality (M<sup>2</sup><1.2).
We have developed several high power picosecond sources using rod-type fiber systems. We will show that a
very simple architecture can produce average power over 90 W @ 1030 nm, 57 W @ 515 nm and 20 W @ 343
nm, with pulse repetition rates ranging from 200 kHz to 80 MHz. Particular emphasis will be given on the
control of non-linear effects in the fiber without relying on CPA.
We report on the demonstration of over 140W at 1030 nm with pulse duration down to 10 ns and M<sup>2</sup><1.3 from a very
simple Q-switched architecture based on rod type fiber laser. These very high peak and average power lead to over 53W
at 515 nm and 19W at 343 nm. We have also obtained diffraction limited beams with an output power exceeding 240W
at 1030 nm and 120W at 515 nm in a very simple MOPA configuration. Due to the very high gain in these fibers, we can
keep pulse durations below 20 ns up to 500 kHz in a purely Q-switched system.
This work reports on an optically-pumped vertical external-cavity surface-emitting laser (VECSEL) emitting around
852 nm for Cesium atomic clocks experiments. We describe the design and the characterization of a VECSEL
semiconductor structure suitable for these applications. The parameters of the structure have been optimized in order to
have a low threshold and a high gain structure emitting around 852 nm. We achieved an output power of 330 mW for
1.1 W of incident pump power. We are able to simulate the laser emission variations with the temperature of the
substrate, the pump radius on the semiconductor structure and the losses inside cavity. A compact and robust setup was
built to obtain a stable single-frequency emission. We obtained a 17-mW single frequency emission exhibiting broad and
fine tunability around the Cesium D<sub>2</sub> line.