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5623687 
Journal Article 
Intracavity gain shaping in millijoule-level, high gain Ho:YLF regenerative amplifiers 
Murari, K; Cankaya, H; Kroetz, P; Cirmi, G; Li, P; Ruehl, A; Hartl, I; Kärtner, FX 
2016 
1 
Optics Letters
ISSN: 0146-9592
EISSN: 1539-4794 
41 
6 
1114-1117 
English 
26977647 
WOS:000373042600011 
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.