282 research outputs found
Double tungstate lasers: From bulk toward on-chip integrated waveguide devices
It has been recognized that the monoclinic double tungstates , , and possess a high potential as rare-earth-ion-doped solid-state laser materials, partly due to the high absorption and emission cross sections of rare-earth ions when doped into these materials. Besides, their high refractive indexes make these materials potentially suitable for applications that require optical gain and high power in integrated optics, with rather high integration density. We review the recent advances in the field of bulk lasers in these materials and present our work toward the demonstration of waveguide lasers and their integration with other optical structures on a chip
Efficient room temperature cw Yb:glass laser pumped by a 946nm Nd:YAG laser
By pumping with a cw diode-pumped Nd:YAG laser operating at 946nm laser operation of a new Yb-doped phosphate glass with 440mW cw output power and a slope efficiency of 48% with respect to the absorbed pump power was achieved at room temperature
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Generation of millijoule few-cycle pulses at 5 Îźm by indirect spectral shaping of the idler in an optical parametric chirped pulse amplifier
Spectral pulse shaping in a high-intensity midwave-infrared (MWIR) optical parametric chirped pulse amplifier (OPCPA) operating at 1 kHz repetition rate is reported. We successfully apply a MWIR spatial light modulator (SLM) for the generation of ultrashort idler pulses at 5 Îźm wavelength. Only bulk optics and active phase control of the 3.5 Îźm signal pulses via the SLM are employed for generating compressed idler pulses with a duration of 80 fs. The 80-fs pulse duration corresponds to less than five optical cycles at the central wavelength of 5.0 Îźm. The pulse energy amounts to 1.0 mJ, which translates into a peak power of 10 GW. The generated pulse parameters represent record values for high-intensity MWIR OPCPAs
Surface and buried planar waveguide lasers based on KY(WO<sub>4</sub>)<sub>2</sub>:Yb<sup>3+</sup>
Highly efficient CW laser emission based on thin layers of KY(WO4)2:Yb3+ grown by liquid-phase epitaxy was demonstrated at room temperature
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Few-cycle 65-ÂľJ pulses at 11.4 Âľm for ultrafast nonlinear longwave-infrared spectroscopy
Low-energy excitations can provide insight into the basic ultrafast nonequilibrium dynamics of condensed matter. High-energy femtosecond pulses in the long-wavelength infrared are required to induce such processes, and can be generated in an optical parametric chirped pulse amplification (OPCPA) system comprising three GaSe stages. A femtosecond Cr:ZnS laser serves as the front-end, providing the seed for the 2.0-Âľm pump and the 2.4-Âľm signal pulses without nonlinear conversion processes. The OPCPA system is pumped at 2.05 Âľm by a picosecond Ho:YLF regenerative amplifier at a 1-kHz repetition rate. The recompressed idler pulses at 11.4 Âľm have a duration of 185 fs and an unprecedented energy of 65 ÂľJ, corresponding to a pump-to-idler conversion efficiency of 1.2%. Nonlinear transmission experiments in the range of the L2 infrared band of liquid water demonstrate the potential of the pulses for nonlinear vibrational spectroscopy of liquids and solids
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