Observation of Self-Phase Modulation and Small-Scale Filaments in Crystals and Glasses

Alfano, R. R.; Shapiro, S. L.

doi:10.1103/physrevlett.24.592

Cited by 680 publications

(258 citation statements)

References 17 publications

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“…As all cubic sesquioxides form continuous series of solid solutions [16], the mixed sesquioxides YScO 3 , LuScO 3 , and ScYLO possess similar crystallographic properties compared to pure sesquioxides containing only one kind of metal ions. Among the rare-earth ions that form cubic oxides, Y has the largest ionic radius (0.9 A˚ ), whereas Sc exhibits the smallest radius (0.75 A˚ ) and Note that the experimentally demonstrated pulse durations in KLM operation can be shorter than the theoretical limit given above due to spectral broadening caused by nonlinear effects such as self-phase modulation [24] The resulting gain spectra for the well-established Yb:Lu 2 O 3 and the mixed sesquioxides Yb:LuScO 3 , Yb:YScO 3 , and Yb:ScYLO can be found in Fig. 3 for typical inversion levels of TDLs from 0 to 30 %.…”

Section: Spectroscopic Investigationsmentioning

confidence: 99%

Yb-doped mixed sesquioxides for ultrashort pulse generation in the thin disk laser setup

Beil¹,

Saraceno

Schriber

et al. 2013

Appl. Phys. B

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Section: Spectroscopic Investigationsmentioning

confidence: 99%

Yb-doped mixed sesquioxides for ultrashort pulse generation in the thin disk laser setup

Beil¹,

Saraceno

Schriber

et al. 2013

Appl. Phys. B

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“…This phenomenon was first observed by R. Alfano and S. Shapiro in 1970 [21]. Such a spectral broadening is driven by the nonlinear effects of self-phase modulation (SPM).…”

Section: White Light Continuummentioning

confidence: 94%

Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides

Sie

2018

Springer Theses

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Semiconductors that are thinned down to a few atomic layers can exhibit novel properties beyond those encountered in bulk forms. Transition-metal dichalcogenides (TMDs) such as MoS 2 , WS 2 and WSe 2 are prime examples of such semiconductors. They appear in layered structure that can be reduced to a stable single layer where remarkable electronic properties can emerge. Monolayer TMDs have a pair of electronic valleys which have been proposed as a new way to carry information in next generation devices, called valleytronics. However, these valleys are normally locked in the same energy level, which limits their potential use for applications.This dissertation presents the optical methods to split their energy levels by means of coherent light-matter interactions. Experiments were performed in a pump-probe technique using a transient absorption spectroscopy on MoS 2 and WS 2 , and a newly developed XUV light source for time and angle-resolved photoemission spectroscopy (TR-ARPES) on WSe 2 and WTe 2 . Hybridizing the electronic valleys with light allows us to optically tune their energy levels in a controllable valley-selective manner. In particular, by using off-resonance circularly polarized light at small detuning, we can tune the energy level of one valley through the optical Stark effect. At larger detuning, we observe a separate contribution from the so-called Bloch-Siegert effect, a delicate phenomenon that has eluded direct observation in solids. The two effects obey opposite selection rules, which enables us to separate the two effects at two different valleys.Monolayer TMDs also possess strong Coulomb interaction that enhances many-body interactions between excitons, both bonding and non-bonding interactions. In the former, bound excitonic quasiparticles such as biexcitons play a unique role in coherent light-matter interactions where they couple the two valleys to induce opposite energy shifts. In the latter, non-bonding interactions between excitons are found to exhibit energy shifts that effectively mimics the Lennard-Jones interactions between atoms. Through these works, we demonstrate new methods to optically tune the energy levels of electronic valleys in monolayer TMDs. AcknowledgmentsFirst and foremost, I would like to thank my advisor Prof. Nuh Gedik for his mentorship and support. He has been a constant source of inspiration since I first started my graduate studies. Actually it was even before that. I remember my first meeting at a conference in Boston where he presented a real-time image of crystalline lattice motion. The idea of watching Michael Jackson performing Billie Jean flashed through my head, because he was that cool and inspiring, and he continues to be so. He has been a tremendous support since day one, where I was given the opportunity to design and build the XUV beamline for ARPES in the lab as well as the freedom to build the white-light setup next to it. His vigor to make new innovations in timeresolved experiments is always inspiring. Throughout my graduate studies, he...

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“…Since its demonstration in the early 1970s [41], the supercontinuum generation has been the focus of significant research activities. It has attracted much attention owing to its enormous spectral broadening (for instance, it is possible to obtain a white light spectrum covering the entire visible range from 400 to 700 nm), which have many useful applications in telecommunication [42], frequency metrology [43], optical coherence tomography [44], and device characterization [45].…”

Section: Generation Of Supercontinuummentioning

confidence: 99%

Supercontinuum and ultrashort-pulse generation from nonlinear Thomson and Compton scattering

2014

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Nonlinear Thomson and Compton processes, in which energetic electrons collide with an intense optical pulse, are investigated in the framework of classical and quantum electrodynamics. Spectral modulations of the emitted radiation, appearing as either oscillatory or pulsating structures, are observed and explained. It is shown that both processes generate a bandwidth radiation spanning the range of few MeV, which occurs in a small cone along the propagation direction of the colliding electrons. Most importantly, these broad bandwidth structures are temporarily coherent which proves that Thomson and Compton processes lead to generation of a supercontinuum. It is demonstrated that the radiation from the supercontinuum can be synthesized into zeptosecond (possibly even yoctosecond) pulses. Thus, confirming that Thomson and Compton scattering can be used as novel sources of an ultra-short radiation, opening routes to new physical domains for strong laser physics.

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Observation of Self-Phase Modulation and Small-Scale Filaments in Crystals and Glasses

Cited by 680 publications

References 17 publications

Yb-doped mixed sesquioxides for ultrashort pulse generation in the thin disk laser setup

Yb-doped mixed sesquioxides for ultrashort pulse generation in the thin disk laser setup

Coherent Light-Matter Interactions in Monolayer Transition-Metal Dichalcogenides

Supercontinuum and ultrashort-pulse generation from nonlinear Thomson and Compton scattering

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