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A crucial issue in the field of high power lasers is the management of thermal effects, leading to mechanical distortions, thermal lenses and optical losses of the laser crystal. A suitable candidate for such application should combine a weak quantum defect and good thermo-mechanical properties in order to limit the heat production in the laser material. In this context, Yb3+:CaGdAlO4 is a promising...
Diode pumped Yb-doped based ultrafast laser systems are of great interest either as direct high intensity systems or as pump sources for OPCPA based systems operating in the extremely short pulse duration regime. Yb-doped tungstates such as Yb:KYW are well known both for their high gain and broad bandwidth and seem to be the right material choice towards a medium energy level amplification of broad...
Thin-disk laser (TDL) technology has a crucial interest for high-power ultrafast laser oscillators. The thermal control of the gain medium allows the generation of high average power and high energy fs pulses directly out of an oscillator. From the past few years, some research efforts have focused on reducing the pulse duration using this technology [1]. In this point of view, we are presenting here...
Results on high-power oscillators based on Yb:CALGO in thindisk architecture are presented, in fs regime, 28W, 1.3μJ, 300 fs pulses and 20W, 0.9μJ, 197 fs pulses and in cw multimode regime 152W.
Nonlinear and spectroscopic properties of pure and Yb 3+ doped fluorites are reviewed. Pure fluorites, like BaF 2 , appear as very valuable nonlinear materials for improving the contrast of high intensity and ultra-short laser pulses. Heavily Yb 3+ doped fluorites, like Yb 3+ :CaF 2 , thanks to the unique luminescence properties, appear as very favourable amplifier...
We report what we believe to be the first Yb:SrF2 regenerative femtosecond amplifier. The regenerative amplifier produces 325-fs pulses at 100-Hz repetition rate with an energy before compression of 1.4 mJ. The interest of Yb:SrF2 in such regenerative amplifiers and its complementarity to its well-known isotype Yb:CaF2 is also discussed.
Since its first laser operation in 2004 [1], Yb:CaF2 has been one of the most studied and promising crystals in the realm of Yb-doped materials for DPSSL applications [2,3]. In fact, this crystal gathers several interesting advantages for the development of high-power diode-pumped lasers, among which an excellent thermal conductivity of 9.3 W/m/K[4], comparable to YAG, a broad emission band, extending...
The thin-disk laser design [1] allows the generation and the amplification of ultrashort pulses with very high efficiency, high output power and good beam quality [2]. Many interesting results were published using Yb:YAG crystal, leading to the generation of high power pulses up to 80 W [3] with a pulse duration around 1ps. Nevertheless, the emission cross section of Yb:YAG limits the generation of...
Industrial applications of ultrafast lasers, notably in the field of precision micro-machining, are rapidly increasing. The quality and flexibility of the interaction process are well established. However, in order to fulfil the productivity requirement of industrial processes, it is necessary to continuously increase the average power of ultrafast lasers.
We demonstrate femtosecond and picoseconds thin disk laser amplifiers based on Yb:YAG as gain material. We obtained a pulse duration of 1 ps in a chirped pulse amplification (CPA) scheme and a pulse duration of about 30 ps in a CPA-free amplifier configuration. Pumped by a max of 70W we obtained an average output power of 20W and pulse energies up to 500μJ.
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