High power erbium femtosecond fiber laser system with stable carrier envelope phase

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The laser system applied for here should allow us to further investigate coherent electron dynamics in solids and at nanometer-sharp metal tips. Since the laser system enables a stable carrier-envelope phase, we can study light-field driven processes. We have done this successfully at a central wavelength of 800 nm in the past; the system applied for here has a central wavelength of about 1.5 um, so that the optical cycle time is about a factor of two longer than before. This is of great interest for intra-cycle effects. Among other things, we want to investigate for how long electronic coherence is preserved in low-dimensional solids such as graphene. Furthermore, the wavelength, which is longer by a factor of two, is interesting, since ponderomotive effects become significantly stronger, which we want to exploit in strong field physics at sharp metal needle tips. With this system, we will therefore be able to venture deeply into the field of strong field physics inside and and on the surface of solids and hope to gain completely new fundamental insights which will be of great interest for future light-wave electronics or petahertzelectronics.