Picosecond spectroscopy using the inverse Raman effect
TL;DR: Inverse Raman spectra are obtained when the intense continuous spectrum of a self-phase modulated picosecond pulse is coincident in liquid and solid samples with an intense 5300 A laser pulse.
About: This article is published in Chemical Physics Letters.The article was published on 1971-03-15. It has received 90 citations till now. The article focuses on the topics: Picosecond & Inverse Raman effect.
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250 citations
TL;DR: In this article, a review of the evolution of the self-focus phenomenon in light beams is presented, and the current status of this rapidly growing area of nonlinear optics and laser physics is discussed.
Abstract: 2012 marked the 50th anniversary of the first published prediction of the self-focusing phenomenon in light beams. The recent revived interest in the subject is due to advances in high-power femtosecond laser technology and due to the possibility they provided of creating extended filaments of high light field intensity in gases and condensed media. This review shows in retrospect how our understanding of the self-action of light evolved from the self-focusing of laser beams in the 1960s to the filamentation of femtosecond laser pulses at present. We also describe the current status of this rapidly growing area of nonlinear optics and laser physics. Finally, we discuss, in general terms, what the phenomena of laser beam self-focusing and laser pulse filamentation have in common and how they differ.
145 citations
TL;DR: In this paper, the transient absorption spectra of a number of compounds in solution at room temperature have been measured with picosecond-scale time resolution and unprecedented accuracy and reliability.
Abstract: The transient absorption spectra of a number of compounds in solution at room temperature have been measured with picosecond‐scale time resolution and unprecedented accuracy and reliability. It is found that the spectra of benzophenone, xanthone, 9‐fluorenone, p‐benzoquinone, acridine, quinoxaline, t‐stilbene all show significant evolution following excitation with the 353 nm third harmonic of a mode‐locked Nd:glass laser. These spectral changes provide evidence for previously unrecognized photophysical behavior in the systems studied, including vibrationally nonthermalized triplet states in benzophenone which persist for tens of picoseconds, and formerly unobserved singlet absorptions in acridine, quinoxaline, fluorenone, and benzoquinone. The inadequacy of single wavelength probing techniques in deducing the dynamics of complex molecular systems such as these is demonstrated by the large extent to which spectra of different states overlap. In many cases a reinterpretation of previous single wavelength results is required because of the presence of vibrationally and electronically unrelaxed species. The apparatus used here to obtain the high quality visible transient spectra is described and its performance characterized.
141 citations
TL;DR: In this article, the authors describe the shaping and analysis of picosecond light pulses and the space-time coherence effects due to the new situation arising in optics such as the circumstances when large amounts of energy are carried by every one of the space time modes of the radiation, a situation realized for example with the laser pulses.
Abstract: Publisher Summary This chapter describes shaping and analysis of picosecond light pulses and the space-time coherence effects due to the new situation arising in optics such as the circumstances when large amounts of energy are carried by every one of the space-time modes of the radiation, a situation realized for example with picosecond laser pulses. The chapter presents basic pulse types frequently involved in operations of shaping or analysis—quasi-monochromatic pulses, having time frequency defined enough for them to obey simple scalar diffraction laws, and the corresponding notion of quasi single space frequency pulses, with well defined space frequency, obeying simple dispersion laws. The chapter explains deterministic pulse shaping by interaction with filters and modulators in terms of temporally coherent optics. In addition, the chapter reviews methods for measurements of pulse durations and devotes its main development to the observations of complex amplitude distributions at the picosecond or sub-picosecond time scale.
141 citations
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TL;DR: In this paper, small-scale filaments were observed in calcite, quartz, sodium chloride, and several glasses under picosecond pulse excitation, and the physical mechanism responsible for these processes is the change in refractive index resulting from electronic distortion.
Abstract: Frequency broadening and small-scale filaments were observed in calcite, quartz, sodium chloride, and several glasses under picosecond pulse excitation. The physical mechanism responsible for these processes is the change in refractive index resulting from electronic distortion.
690 citations
192 citations
89 citations