| 1. |
- Mauritsson, Johan, et al.
(author)
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Attosecond electron interferometry
- 2013
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In: Attosecond Physics : Attosecond Measurements and Control of Physical Systems - Attosecond Measurements and Control of Physical Systems. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 1556-1534 .- 0342-4111. - 9783642376221 - 9783642376238 ; 177, s. 121-134
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Book chapter (peer-reviewed)abstract
- Attosecond extreme ultraviolet light pulses have the potential to resolve the ultrafast electron dynamics that govern basic properties of atoms, molecules, and solids. Here we present three different interferometric pump-probe methods aiming to access not only the temporal dynamics, but also state specific phase information after excitation/ionization using attosecond pulses.
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| 2. |
- Bood, Joakim, et al.
(author)
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Diagnostic properties of two-photon-pumped stimulated emission in atmospheric species
- 2018
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In: Springer Series in Optical Sciences. - Cham : Springer International Publishing. - 1556-1534 .- 0342-4111. ; 208, s. 1-17
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Book chapter (peer-reviewed)abstract
- Two-photon excitation provides access to atoms and molecules with absorption resonances in the vacuum ultraviolet (VUV), i.e., to the species otherwise inaccessible for probing under atmospheric conditions, since the atmosphere strongly absorbs VUV radiation. In addition, for high enough laser intensities, two-photon pumping may create population inversion between the pumped energy state and a lower-lying intermediate state, resulting in stimulated emission. In this chapter such an emission is discussed in terms of its diagnostic capacity. The method has primarily been investigated for the detection of a number of atomic species, such as oxygen and nitrogen, and a few small molecules, for example, CO and NH3. The major benefits of the technique are that the signal propagates in a laser-like beam, the backward-directed beam allows single-ended diagnostics, strong signals allow trace-level detection, and the optical setup is relatively simple. The main disadvantages are the poor and sometimes ambiguous spatial resolution and the difficulties with modeling the process due to the nonlinear dependence of the signal on the concentration of the active species and the integrative-growth nature of the signal. Besides exploring the potential for diagnostics, early works on two-photon-induced stimulated emission have been imperative for today’s development of air-lasing concepts based on backward-directed stimulated emission. This chapter is devoted to a review and summary of these pioneering studies.
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| 3. |
- Carré, B., et al.
(author)
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Characterization of attosecond pulse trains
- 2007
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In: Ultrafast Optics V. - New York, NY : Springer New York. - 1556-1534 .- 0342-4111. - 9780387491172 ; 132, s. 45-56
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Conference paper (peer-reviewed)abstract
- Ultrashort light pulses, as short as 100 as, can be produced from high harmonic generation (HHG) in an atomic gas medium. This major achievement of the last 6 years in high field physics has now been demonstrated in different conditions of medium-field interaction [1].
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| 4. |
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| 5. |
- Lu, W., et al.
(author)
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Introduction to physics and optical properties of semiconductors
- 2018
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In: Springer series in optical sciences. - Cham : Springer. - 0342-4111 .- 1556-1534. ; 215, s. 23-71
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Journal article (peer-reviewed)abstract
- As the theoretical basis for the whole book, we introduce fundamental physics and optical properties of semiconductors in this chapter. We start the chapter by describing the electrons and their energy band structures in semiconductors based on quantum mechanics, then the electromagnetic field by the Maxwell’s equations. The focus of the chapter, and actually the central theme of the book, namely, the light-matter interaction, is studied in terms of first quantizing the electromagnetic field in terms of the number of photons and the energy carried per photon then calculating the optical transition of the electron between energy bands in semiconductors after either absorbing or emitting one photon. We also describe the phonon spectrum of the semiconductor which is responsible for many key features in the infrared spectra of the semiconductors.
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| 6. |
- Lu, W., et al.
(author)
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Modulation spectroscopy
- 2018
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In: Springer series in optical sciences. - Cham : Springer. - 0342-4111 .- 1556-1534. ; 215, s. 159-183
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Journal article (peer-reviewed)abstract
- Optical spectroscopy is studied when a periodic external perturbation, such as an electromagnetic field, temperature, and static pressure or uniaxial stress, is applied to the semiconductor during the process of experimental measurement. The modulation spectroscopy, i.e., the change of the optical spectrum produced by the external perturbation, rather than the absolute spectrum itself, reveals many fine structures in the electronic energy diagram of the semiconductor.
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| 7. |
- Lu, W., et al.
(author)
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Optical spectral measurement
- 2018
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In: Springer Series in Optical Sciences. - Cham : Springer. - 0342-4111 .- 1556-1534. ; , s. 1-21
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Journal article (peer-reviewed)abstract
- A monochromatic light is quantified by its brightness and color, i.e., its optical power and wavelength. And a light beam is normally composed of many monochromatic lights of different powers and wavelengths. In this chapter we discuss three optical dispersive devices, namely, prism, diffraction grating, and Fourier transform spectroscopy, to resolve the compositing monochromatic lights of a light beam. Prism and diffraction grating disperse the compositing monochromatic lights in the light beam into different spatial regions, and are therefore denoted as spatial dispersion, while Fourier transform spectroscopy disperses the light beam in the time domain.
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| 8. |
- Lu, W., et al.
(author)
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Photocurrent spectroscopy
- 2018
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In: Springer Series in Optical Sciences. - Cham : Springer. - 0342-4111 .- 1556-1534. ; , s. 185-205
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Journal article (peer-reviewed)abstract
- Applying an external electric bias on a semiconductor can produce an electric current. Impinging a light on a semiconductor already having an external electric bias can generate an extra electric current called photocurrent whose amplitude depends on the optical power and the wavelength of the light. In this chapter we study the photocurrent spectra of quantum well infrared photodetector and solar cells using quantum dots. We also study the photocurrent induced by multiphoton excitation.
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| 9. |
- Lu, W., et al.
(author)
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Reflection and transmission
- 2018
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In: Springer Series in Optical Sciences. - Cham : Springer. - 0342-4111 .- 1556-1534. ; 215, s. 73-106
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Journal article (peer-reviewed)abstract
- In this chapter we study how a material reflects and transmits a light beam in terms of the macroscopic effective dielectric coefficient of the material. The focus of the chapter is to extract the effective dielectric coefficient of the material using the harmonic oscillator model and the Kramers–Kronig relationship by properly designing the reflection and transmission spectroscopic measurements including the reflection and transmission spectra from and through a thin film and the reflection spectrum from a thin film on a substrate.
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| 10. |
- Larsson, Anders, 1957, et al.
(author)
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Single-mode VCSELs
- 2013
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In: Springer Series in Optical Sciences. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 0342-4111. ; 166, s. 119-144
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Journal article (peer-reviewed)
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