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FemtoFiber
®
pro Laser System
Page 6
Status: 6.9.18
1.1 Principle of Operation
Figure 2 Schematic setup of the FemtoFiber
®
pro laser system
The FemtoFiber® pro Laser System illustrated in Figure 2 is based on state-of-the-art telecom components.
A core-pumped fiber, doped with Erbium ions, acts as the active laser medium. A so called saturable
absorber mirror (SAM) inside the ring cavity (1) in Figure 2 favors mode-locked operation over continuous
wave laser activity by exploiting the effect of picking and amplifying only pulses with a certain ampli-
tude. As a consequence, the mode locked ring oscillator generates well-defined light pulses at a center
wavelength of 1560 nm with a repetition rate of 80 MHz (standard, other rep. rates upon request).
With the high gain available from Er:fibers, the optical power extracted from the oscillator is used for
seeding optical amplifiers. Every laser system contains an internal amplifier, but also has one (or more)
FC/APC ports for seeding external amplifiers, e.g. for multiple beam experiments needing synchronized
pulses, such as pump-probe experiments.
The pulse duration is controlled by a variable dispersion control unit, formed by a motorized prism
compressor (2). The light pulses typically exhibit a duration of less than 100 fs (or longer if desired) with an
average power of more than 350 mW.