Versatile ultrashort pulse laser tunable up to nanosecond range

Abstract

A new versatile patent-pending technology enabling new operation regimes and a unique set of features in the industrialgrade 30 W-level average power femtosecond hybrid laser is introduced in this work. The developed technology, based on the use of an all-in-fiber active fiber loop (AFL), enabled to form GHz bursts of ultrashort laser pulses with any desired pulse repetition rate and any number of pulses in a burst with identical intra-burst pulse separation. Furthermore, the AFL allowed to tune pulse duration from a few hundred femtoseconds to picoseconds and even up to the nanosecond range.

Where flexibility meets precision

“…The patent-pending AFL technology allows the pulse duration to be tuned by controlling the dispersion accumulation in the loop [10,11]. In this case, CFBG is used to add additional dispersion and thereby to stretch the pulses in time during each round trip.…”

Novel dual-wavelength front-end with active fiber loop for high intensity laser systems

“…When AOM2 is turned on again (resulting in the highest transmission of radiation), the formation of the pulse sequence with a different duration can be restarted. [3] Figure 5. (left) A sequence of pulses at the output of the AFL (right) Dependence of pulse duration on the number of round-trips inside the AFL by using a CFBG pulse stretcher Figure 6 displays the pulse spectra and separate pulse envelopes from the pulse sequence.…”