Mode-locked operation of a diode-pumped femtosecond Yb : SrF2 laser

International audienceFemtosecond mode-locked operation is demonstrated for the first time, to our knowledge, with a Yb:SrF2 crystal. The shortest pulse duration is 143 fs for an average power of 450 mW. The highest average power is 620 mW for a pulse duration of 173 fs. Since Yb:SrF2 corresponds to the longest-lifetime Yb-doped crystal with which the mode-locking operation has been achieved, a detailed analysis is carried out to characterize the quality of the solitonlike regime

Low-repetition-rate femtosecond operation in extended-cavity mode-locked Yb:CALGO laser

International audienceWe report on an extended-cavity mode-locked laser based on an Yb:CALGO crystal operating either at 27 MHz and 93 fs pulse duration or at 15 MHz and 170 fs duration single-pulse regime. To the best of our knowledge this is the first demonstration of an extended-cavity oscillator based on Yb-doped crystal produc- ing sub-100 fs pulses. The pulse energy was 24 nJ directly at the output of the oscillator (and 17 nJ after compression). Based on a similar design, we also demonstrate an unprecedented double-pulse dual- wavelength femtosecond regime. An explanation of this atypical regime is proposed

Thermal behaviour of ytterbium-doped fluorite crystals under high power pumping

International audienceWe report an in situ thermal study of Yb-doped fluorite crystals Yb:CaF2 and Yb:SrF2 under high power pumping, with or without laser operation. The experiment combines simultaneously thermography and measurement of the thermal aberrations. This setup allows us to measure temperature gradients, thermal lens, and absorption coefficients. From these measurements, we evaluate the thermal conductivity, fractional thermal load, and thermo-optic coefficient. Great differences are observed between the lasing and non lasing regimes. Our measured thermal lenses are greater than what are expected from the thermo-optic parameters found in previous work. Based on this thermal study, we design a laser cavity operating with large output power and TEM00, leading to better performances for Yb:CaF2 than Yb:SrF2

Diode-pumped 99 fs Yb : CaF2 oscillator

International audienceWe demonstrate the generation of 99 fs pulses by a mode-locked laser oscillator built around a Yb:CaF2 crystal. An average power of 380 mW for a 13 nm bandwidth spectrum centered at 1053 nm is obtained. The short-pulse operation is achieved thanks to a saturable absorber mirror and is stabilized by the Kerr lens effect. We investigated the limits of the stabilization process and observed a regime slowly oscillating between mode locking and Q switching

Développement de nouvelles sources laser femtosecondes à base de cristaux dopés ytterbium et pompés par diode laser

Thermal and thermo-optics studies of new Yb-doped crystals (Yb:CaF2, Yb:SrF2 and Yb:CALGO) and realization of ultra-short pulses lasers based on Yb-doped crystalsEtude des propriétés thermiques et themo-optique des cristaux de Yb:CaF2, Yb:SrF2 et Yb:CALGO avec pour but de réaliser des lasers femtoseconde de forte puissance moyennes

Yb3+ Doped (Ca,Sr,Ba)F2 for High Power Laser Applications

International audienceYb3+ doped CaF2 has been proved in the last years to be one of the most attractive Yb3+ doped materials for broadly tunable, high power and shor

Ultrashort pulses high power diode pumped laser based on a new ytterbium doped CaGdAlO4 crystal

International audienc

Yb3+ Doped (Ca,Sr,Ba)F2 for High Power Laser Applications

International audienceYb3+ doped CaF2 has been proved in the last years to be one of the most attractive Yb3+ doped materials for broadly tunable, high power and shor

Yb-doped fluorite lasers under 100W diode pumping and in situ measurement of their thermal constants

International audienc

Mode-locked operation of a diode-pumped femtosecond Yb : SrF2 laser

International audienceFemtosecond mode-locked operation is demonstrated for the first time, to our knowledge, with a Yb:SrF2 crystal. The shortest pulse duration is 143 fs for an average power of 450 mW. The highest average power is 620 mW for a pulse duration of 173 fs. Since Yb:SrF2 corresponds to the longest-lifetime Yb-doped crystal with which the mode-locking operation has been achieved, a detailed analysis is carried out to characterize the quality of the solitonlike regime