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We demonstrate pulse burst generation method based on the Vernier effect. The pulse burst with controllable amplitudes and phases is formed using a femtosecond oscillator and regenerative amplifier cavity that have slightly different round trip times. This operation mode can be used for the purposes of coherent pulse stacking, rapid material miroprocessing and rapid scan spectroscopy.
Here we present a coherent pulse stacking approach for up-scaling energy of a solid-state femtosecond chirped pulse amplifier. We demonstrate pulse splitting into four replicas, amplification in a specially designed regenerative amplifier cavity, and phase-locked stacking into one dominant pulse. An optimized regenerative amplifier design for non-overlapping pulse train amplification is presented.
We report on the design and performance of a cryogenic kilohertz Yb:CaF2 CPA producing 30-mJ, 200-fs pulses. A two-stage scheme enables bistability-free amplification in the repetition frequency range of 0.5–10 kHz, sustaining >20 W average power.
2.7-μm microjoule femtosecond pulses are generated in a metal coated hollow fiber thru four-wave-mixing parametric amplification. Numerical simulations predict generation of few-cycle optical pulses with the central wavelength extending beyond 10 μm.
We demonstrate direct feed-forward CEP control of a regenerative amplifier in a single stage, resulting in unprecedented sub-100 mrad phase jitters of an amplified system. Energy scalability of the approach is shown.
Yb-doped femtosecond fiber chirped pulse amplifiers (FCPAs) are extremely attractive to replace their solid-state counterparts in when it comes to robustness and ease of operation. However, in most Yb-doped FCPAs delivering high-energy output pulses the advantages of robustness and ease of operation are forfeited since free-space optical components are used to stretch and compress the pulses. The...
Ytterbium doped fiber chirped pulse amplifiers (FCPAs) are attractive sources to replace their solid-state counterparts in applications like micromachining, for example for manufacturing photonic devices in bulk glass substrates. For such applications, a pulse duration of several tens of fs is often considered to be optimal so that one can write features with a sub-wavelength precision. However, the...
The gain bandwidth of Ho-doped crystals is sufficiently broad to support femtosecond operation, which would allow pumping of ultrashort-pulse mid-IR optical parametric amplifiers (OPAs) [1,2] and, upon reaching adequate peak powers, eye-safe filamentation in the >2-μm transparency window of the atmosphere. In this contribution, we report on, to our knowledge, the first demonstration of a femtosecond...
Carrier-envelope control is one of the key technologies for attosecond pulse generation. Although the timing jitter between the carrier and the envelope has recently been demonstrated down to sub-10-attosecond range [1], CEP control is still limited to a rather narrow class of lasers, including Ti:sapphire and some other selected broadband laser materials. Typically, stabilization of a CPA laser source...
We present a completely monolithic Yb-fiber chirped pulse amplifier that uses a dispersion matched fiber stretcher and hollow core photonic bandgap compressor fiber. The output pulses are compressed to almost Fourier limited duration.
Femtosecond Tm-fiber-laser-pumped Ho:YAG room-temperature CPA system delivering scalable multi-mJ multi-kHz pulses with a bandwidth exceeding 12 nm and the average power of 15 W is developed. Recompressed 530-fs pulses are suitable for broadband WL generation in transparent solids.
Energy saturation is achieved by seeding 1-kHz Yb:CaF2 amplifier by μJ pulses from a monolithic Yb-fiber MOPA leading to 6-mJ output. The saturation is possible at any rep-rate with appropriate seed and optical loss levels.
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