Special Issue "Multi-Color Laser Emission for the Generation of Ultrashort Optical Pulse"


A special issue of Applied Sciences (ISSN 2076-3417).

Deadline for manuscript submissions: 31 March 2015

Special Issue Editor

Guest Editor
Prof. Dr. Totaro Imasaka
Department of Applied Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
Website: http://www.apan.cstm.kyushu-u.ac.jp/en/prof/rireki.html
E-Mail: imasaka@cstf.kyushu-u.ac.jp
Phone: +81-92-802-2883
Fax: +81-92-802-2888
Interests: analytical chemistry; analytical instrumentation; analytical science; trace analysis; lasers; non-linear optics; spectrometry

Special Issue Information

Dear Colleagues,

The pulse width of an electromagnetic wave is determined by the frequency band width of the wave used. Therefore, one femtosecond is the ultimate in pulse width for an “optical” wave. For this reason, several methods have been proposed for the generation of an ultrashort optical pulse. For example, resonance/non-resonance four-wave mixing would be one of the candidates for generating multi-color laser emission in an extremely wide spectral region, thus breaking the 1-fs barrier.

To date, numerous emission lines have been generated from the deep-ultraviolet to the near-infrared region (<45,000 cm−1). Such generations use a variety of techniques, such as four-wave Raman mixing in molecular hydrogen. This type of technique is promising for the generation of 1-fs optical pulses via phase locking and the Fourier synthesis of the emission lines. For verification, it would be necessary to develop a new method for measuring the pulse width, since the spectral band width approaches or is beyond one octave.

Ultrashort optical pulses can be utilized in a variety of applications in science and technology. For example, an ultrashort optical pulse can be used in the studies of ultrafast phenomena. More practically, a laser pulse shorter than 100 fs is reported to be useful in mass spectrometry for observing a molecular ion of triacetone triperoxide, an explosive used in terrorist attacks. A train of ultrashort optical pulses in the terahertz region, which has been generated in the optical cavity to enhance the nonlinear optical effect, would be employed as a clock pulse in optical computation/communication in future advanced industries. Therefore, it would be important to investigate a new frontier in the generation of multi-color laser emission for Fourier synthesis to generate ultrashort optical pulses and to publish a new issue of invited papers to clarify new trends in the state-of-the-art.

Prof. Dr. Totaro Imasaka
Guest Editor


Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. Papers will be published continuously (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are refereed through a peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed Open Access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 500 CHF (Swiss Francs). English correction and/or formatting fees of 250 CHF (Swiss Francs) will be charged in certain cases for those articles accepted for publication that require extensive additional formatting and/or English corrections.


  • multi-color laser
  • Fourier synthesis
  • ultrashort optical pulse
  • four-wave mixing
  • high-order sideband generation
  • ultrafast phenomena
  • data communication

Published Papers (5 papers)

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Displaying article 1-5
p. 515-524
by , , ,  and
Appl. Sci. 2014, 4(4), 515-524; doi:10.3390/app4040515
Received: 12 May 2014 / Revised: 6 November 2014 / Accepted: 10 November 2014 / Published: 26 November 2014
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p. 498-514
by ,  and
Appl. Sci. 2014, 4(4), 498-514; doi:10.3390/app4040498
Received: 26 September 2014 / Revised: 5 November 2014 / Accepted: 10 November 2014 / Published: 18 November 2014
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p. 444-467
by ,  and
Appl. Sci. 2014, 4(3), 444-467; doi:10.3390/app4030444
Received: 4 June 2014 / Revised: 22 July 2014 / Accepted: 12 August 2014 / Published: 22 September 2014
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p. 390-401
by  and
Appl. Sci. 2014, 4(3), 390-401; doi:10.3390/app4030390
Received: 27 May 2014 / Revised: 14 August 2014 / Accepted: 27 August 2014 / Published: 5 September 2014
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p. 318-330
by ,  and
Appl. Sci. 2014, 4(3), 318-330; doi:10.3390/app4030318
Received: 4 April 2014 / Revised: 29 May 2014 / Accepted: 13 June 2014 / Published: 1 July 2014
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Type of Paper: Article
Title: Sum-Frequency-Generation-Facilitated Laser Sidebands for Tunable Femtosecond Raman Spectroscopy in the Ultraviolet
Authors: Liangdong Zhu 1,2, Weimin Liu 1, Yanli Wang 1 and Chong Fang 1,2,*
Affiliations: 1 Department of Chemistry, Oregon State University, Corvallis, OR 97331-4003 USA;
2 Department of Physics, Oregon State University, Corvallis, OR 97331-4003 USA
Abstract: Femtosecond stimulated Raman spectroscopy (FSRS) is an emerging molecular structural dynamics technique for materials characterization typically in the visible to near-IR range. To expand its applications we have developed a versatile FSRS setup in the ultraviolet region. We use the combination of a narrowband, 400 nm Raman pump from a home-built second harmonic bandwidth compressor and a tunable broadband probe pulse from sumfrequency-generation-facilitated cascaded four-wave mixing (SFG-CFWM) laser sidebands in a thin BBO crystal. The ground state Raman spectrum of a laser dye Quinolon 390 in methanol that strongly absorbs at ~350 nm is systematically studied as a standard. Both the Stokes and anti-Stokes Raman spectra can be collected by selecting different orders of SFG-CFWM sidebands as the probe pulse. The stimulated Raman gain with the 400 nm Raman pump is >21 times larger than that with the 550 nm Raman pump when measured at 1,317 cm–1 for the aromatic ring deformation and ring-H rocking mode of the dye molecule, demonstrating that preresonance enhancement is effectively achieved in this unique UV-FSRS setup.
Keywords: femtosecond spectroscopy; four-wave mixing; tunable laser sidebands; stimulated Raman scattering; resonance enhancement; molecular vibrations

Type of Paper: Review
Fundamentals of Highly-Nondegenerate Cascaded Four Wave Mixing
H. Crespo 1 and R. Weigand 2
1 Departamento de Física e Astronomia e IFIMUP-IN, Faculdade de Ciências, Universidade do Porto, R. do Campo Alegre 68. 4169-007 Porto, Portugal;
Departamento de Óptica. Facultad de Ciencias Físicas. Universidad Complutense de Madrid. Avda. Complutense s/n. 28040 Madrid, Spain
By crossing two intense ultrashort laser pulses with different colours in a transparent medium, such as a simple piece of glass, a fan of multicoloured broadband light pulses can be simultaneously generated. These newly generated pulses are emitted in several well-defined directions and can cover a broad spectral range, from the infrared to the ultraviolet and beyond. This beautiful phenomenon, first observed and described 15 years ago, is due to highly-nondegenerate cascaded four-wave mixing (cascaded FWM, or CFWM).
Here we present a review of our work on the generation and measurement of multicoloured light pulses based on third-order nonlinearities in transparent solids, from the discovery and first demonstration of highly-nondegenerate CFWM, to the generation of isolated single-cycle pulses by coherent synthesis of multicoloured light pulses produced by CFWM. Along the way we will also present the development and main results of a nonlinear propagation 2.5-D model capable of adequately describing non-collinear FWM and CFWM processes, as well as a new method for the generation of femtosecond pulses in the deep-ultraviolet (DUV).
These experimental and theoretical results show that highly-nondegenerate third-order nonlinear optical processes are formally well understood and provide broader bandwidths than other nonlinear optical processes for the generation of ultrashort light pulses with wavelengths extending from the near-infrared to the deep-ultraviolet, which have many applications in science and technology.
Cascaded Four-Wave Mixing; single-cycle pulses; DUV ultrashort pulse generation

Last update: 9 February 2015

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