Widely tunable femtosecond optical parametric amplifier at 250 kHz with a Ti:sapphire regenerative amplifier

Reed, Murray K.; Steiner-Shepard, Michael K.; Negus, Daniel K.

doi:10.1364/ol.19.001855

Cited by 89 publications

(29 citation statements)

References 13 publications

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“…The first experimental demonstration of the SC generation in sapphire dates back to 1994 [201], revealing sapphire as a long sought solid-state material to replace the liquid media commonly used at that time, putting the technology of femtosecond optical parametric amplifiers on all-solid state grounds (see also [202] for more details). Since then, sapphire became a routinely used nonlinear medium for SC generation with Ti:sapphire driving lasers, providing a high quality seed signal that boosted the development of modern ultrafast optical parametric amplifiers [45,47,203].…”

Section: Laser Hostsmentioning

confidence: 99%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

156

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Nonlinear propagation of intense femtosecond laser pulses in bulk transparent media leads to a specific propagation regime, termed femtosecond filamentation, which in turn produces dramatic spectral broadening, or superbroadening, termed supercontinuum generation. Femtosecond supercontinuum generation in transparent solids represents a compact, efficient and alignment-insensitive technique for generation of coherent broadband radiation at various parts of the optical spectrum, which finds numerous applications in diverse fields of modern ultrafast science. During recent years, this research field has reached a high level of maturity, both in understanding of the underlying physics and in achievement of exciting practical results. In this paper we overview the state-of-the-art femtosecond supercontinuum generation in various transparent solid-state media, ranging from wide-bandgap dielectrics to semiconductor materials and in various parts of the optical spectrum, from the ultraviolet to the mid-infrared spectral range. A particular emphasis is given to the most recent experimental developments: multioctave supercontinuum generation with pumping in the mid-infrared spectral range, spectral control, power and energy scaling of broadband radiation and the development of simple, flexible and robust pulse compression techniques, which deliver few optical cycle pulses and which could be readily implemented in a variety of modern ultrafast laser systems.

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Section: Laser Hostsmentioning

confidence: 99%

Ultrafast supercontinuum generation in bulk condensed media

Dubietis¹,

Tamošauskas²,

Šuminas³

et al. 2017

Lith. J. Phys.

156

View full text Add to dashboard Cite

show abstract

“…The single filament continuum was generated by focusing a small intensity fraction of the amplifier output onto a 1 mm thick sapphire glass. [41][42][43] The NOPA output pulse was compressed with a pair of chirp mirrors and then with a prism pair, resulting in a Fourier-transform (FT) limited pulse duration of 6.7 fs. The pulse from the NOPA with the spectrum extending from 535 to 725 nm was split into two as the pump and probe pulses with energies of about 45 and 5 nJ, respectively.…”

Section: Methodsmentioning

confidence: 99%

Classification of Dynamic Vibronic Couplings in Vibrational Real-Time Spectra of a Thiophene Derivative by Few-Cycle Pulses

2007

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Pump-probe spectroscopy was performed with a few cycle pulses of 6.7 fs duration. The electronic transition intensity modulation was induced by molecular vibration in a quinoid thiophene molecule in solution. The real-time vibrational features were analyzed in terms of dependence of vibrational amplitude and phase on probe photon energy. The electronic transition probability is modulated by molecular vibration via vibronic coupling. Changes in the spectral shape and intensity of the time-resolved spectrum were studied by tracking characteristic spectral features including the peak frequency and intensity, spectral bandwidth, and band-integrated intensity. From the analysis the modulation mechanisms were classified into two groups: (1) Condon type and (2) non-Condon type. The features of the wave packet motions were also classified into zeroth-order derivatives due to quasi-pure non-Condon type and first- and second-order derivative types due to the displacement of the potential minimum and the potential curvature change associated with the relevant vibronic transition, respectively.

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“…Figure 1C shows the experimental set-up. We used pulses with a duration of 50-80 fs at around 680 nm with pulse energies of about 100 nJ from a home-built optical parametric amplifier [32] pumped by a regenerative Ti : sapphire amplifier (COHERENT REGA) at a repetition rate of 200 kHz. Careful alignment using FROG [33] made sure that the pulses were chirp-free, which is essential for the experiment.…”

Section: Methodsmentioning

confidence: 99%