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Relaxation and emission dynamics of a dense quantized magneto-plasma excited by intense femtosecond laser pulses in In0.2Ga0.8As/GaAs multiple quantum wells are probed by time-resolved transient absorption and time-resolved photoluminescence experiments in high magnetic fields.
Femtosecond laser-written active waveguide devices, namely waveguide amplifiers and DFB waveguide lasers were fabricated in doped phosphate glasses. Gain was achieved across the complete C-band and a laser with output power of 102 mW was demonstrated.
We demonstrate error free transmission at bit rates up to 32 Gb/s at room temperature and 25 Gb/s at 85degC using a 9 mum oxide aperture 850 nm VCSEL. The VCSEL design is optimized for high speed operation by minimizing parasitics, reducing self-heating, and using strained InGaAs quantum wells to improve differential gain.
We report on a 300-W-level picosecond laser based on a cryogenically-cooled Yb:YAG amplifier seeded by a fiber CPA system. High-average-power picosecond second harmonic generation is also presented.
By exploiting optical parametric generation in periodically poled lithium niobate driven by a Yb:KYW laser, we realized a two-colour pump-probe system in the near- and mid-infrared with 1-MHz repetition rate, 300-fs resolution and 10-5 sensitivity.
A diode-pumped ytterbium doped INNOSLAB fs-amplifier with 400 W output power was realized. The pulse duration of the output pulses was almost transform limited 682 fs for Yb:YAG at a pulse repetition rate of 76 MHz. This was achieved at room temperature without the use of any stretcher or compressor setup.
We evidenced the polarization rotation in an Yb3+ rod type fiber amplifier injected by a subnanosecond microlaser. Simple numerical simulations account for the observed phenomena.
An Yb:YAG diode pumped CPA laser system based on thin disk technology has been set up. The system works at 100 Hz repetition rate emitting 1 ps pulses with several hundred mJ energy. Scalability allows upgrade to the Joule level.
Cavity dumping of a fiber laser is demonstrated. A microstructured fiber with an electrically driven internal electrode is used for intracavity polarization rotation with nanosecond risetime. The optical flux can be dumped within one roundtrip.
Single 4-mJ supercontinuum filaments supporting 8-fs pulses are generated by focusing ultrashort pulses from a four-stage KTP-OPCPA into a noble-gas cell. The use of a 1.6-mum wavelength permits efficient energy scaling in the single-filament regime.
Quasi super continuum generation at 1.1-1.4 mum is demonstrated using ultrahigh speed wavelength tuning of femtosecond soliton pulses for the first time. The center wavelength, bandwidth, and spectrum shape can be changed arbitrarily.
A long ring-cavity, low repetition rate Yb-doped fiber laser was demonstrated. Pulses with repetition rate of about 381.3 kHz and single pulse energy above 300 nJ were obtained.
We demonstrate a mid-infrared optical parametric chirped-pulse amplifier with a pulse energy of 1 muJ at 100 kHz repetition rate. Its output is compressed to 92 fs by a prism compressor and characterized by SHG-FROG.
An Yb:KYW femtosecond regenerative amplifier with combination of two partially overlapping gain spectra from a single thin disk, producing 500 muJ sub 200 fs pulses at a repetition rate of 20 kHz, is presented.
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