title: Intracavity gain shaping in millijoule-level, high gain Ho:YLF regenerative amplifiers.
abstract: We demonstrate intracavity gain shaping inside a 2 μm Ho:YLF regenerative amplifier with a spectral bandwidth of 2.9 nm broadened to 5.4 nm, corresponding to Fourier-limited pulses of 1 ps duration. The intracavity gain shaping is achieved by using a simple etalon, which acts as a frequency-selective filter. The output of the regenerative amplifier is amplified by a single-pass amplifier, and we achieve total energy of 2.2 mJ and pulse duration of 2.4 ps at 1 kHz with pulse fluctuations <1%. The amplifier chain is seeded by a home-built mode-locked holmium-doped fiber oscillator.
authors.forename: Krishna
authors.initials: K
authors.lastname: Murari
authors.forename: Huseyin
authors.initials: H
authors.lastname: Cankaya
authors.forename: Peter
authors.initials: P
authors.lastname: Kroetz
authors.forename: Giovanni
authors.initials: G
authors.lastname: Cirmi
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.forename: Axel
authors.initials: A
authors.lastname: Ruehl
authors.forename: Ingmar
authors.initials: I
authors.lastname: Hartl
authors.forename: Franz X
authors.initials: FX
authors.lastname: Kärtner