High spectral brightness QCLs

2021 ◽  
Author(s):  
Enrique Cristobal ◽  
Hong Shu ◽  
Arkadiy A. Lyakh
Keyword(s):  
Spectral Brightness

scholarly journals Linear optics control of sideband instability for improved free-electron laser spectral brightness

2020 ◽  
Vol 23 (11) ◽  
Author(s):  
G. Perosa ◽  
E. M. Allaria ◽  
L. Badano ◽  
N. Bruchon ◽  
P. Cinquegrana ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Spectral Brightness ◽  
Linear Optics

Combined use of spectral brightness and polarization characteristics of upward radiation in remote sensing of inland waterbodies

1996 ◽  
pp. 233-236
Author(s):  
Anatoly A. Buznikov ◽  
Gennady A. Lakhtanov ◽  
Kirill A. Mokievsky ◽  
Viktor B. Rumyantsev ◽  
Stefanida G. Shvareva
Keyword(s):  
Remote Sensing ◽  
Spectral Brightness ◽  
Combined Use ◽  
Polarization Characteristics

Ultrahigh-spectral-brightness Excimer Lasers as Pump Sources for Coherent Soft X-ray Generation

1981 ◽  
Author(s):  
H. Egger ◽  
H. Pummer ◽  
T. Srinivasan ◽  
C. K. Rhodes
Keyword(s):  
Excimer Lasers ◽  
Spectral Brightness ◽  
X Ray

scholarly journals A Vigilance Explanation of Musical Chills? Effects of Loudness and Brightness Manipulations

2020 ◽  
Vol 3 ◽  
pp. 205920432091565
Author(s):  
Scott Bannister
Keyword(s):  
Emotional Experience ◽  
Spectral Brightness ◽  
Musical Structure ◽  
Low Level ◽  
Complex Interactions ◽  
Musical Structures ◽  
Study Participants ◽  
And Control ◽  
Auditory Looming ◽  
Control Piece

Recent research has suggested that low-level psychoacoustic parameters such as loudness and spectral brightness are correlated with musical chills, a subjective emotional experience accompanied by goosebumps, shivers, and tingling sensations. These relationships may be explained by a vigilance theory of chills, through the process of auditory looming; however, these correlations or theories have never been causally tested. In the current study, participants ( N = 40) listened to five variations (original, low loudness, high loudness, low brightness, high brightness) of an experimental and control piece of chills music, characterized by a crescendo and guitar solo respectively; this qualitative distinction was made based on whether the underlying musical structure of the pieces was or was not capable of engaging auditory looming processes. It was predicted that increases in loudness would result in increased chills frequency across participants, indicated by button presses; brightness was included as an exploratory parameter. Results show that for the experimental piece, increases in loudness resulted in significantly more frequent chills experiences, and increases in brightness significantly reduced the frequency of chills, whereas no effects were found for the control piece. Findings are discussed in terms of vigilance and social bonding theories of chills, and the complex interactions between low-level psychoacoustic properties and higher-level musical structures.

scholarly journals The potential of future light sources to explore the structure and function of matter

IUCrJ ◽  
2015 ◽  
Vol 2 (2) ◽  
pp. 230-245 ◽  
Author(s):  
Edgar Weckert
Keyword(s):  
Storage Ring ◽  
Structural Changes ◽  
Imaging Techniques ◽  
Single Pulse ◽  
Storage Rings ◽  
Correlation Spectroscopy ◽  
Light Sources ◽  
Spectral Brightness ◽  
Diffractive Imaging ◽  
X Ray

Structural studies in general, and crystallography in particular, have benefited and still do benefit dramatically from the use of synchrotron radiation. Low-emittance storage rings of the third generation provide focused beams down to the micrometre range that are sufficiently intense for the investigation of weakly scattering crystals down to the size of several micrometres. Even though the coherent fraction of these sources is below 1%, a number of new imaging techniques have been developed to exploit the partially coherent radiation. However, many techniques in nanoscience are limited by this rather small coherent fraction. On the one hand, this restriction limits the ability to study the structure and dynamics of non-crystalline materials by methods that depend on the coherence properties of the beam, like coherent diffractive imaging and X-ray correlation spectroscopy. On the other hand, the flux in an ultra-small diffraction-limited focus is limited as well for the same reason. Meanwhile, new storage rings with more advanced lattice designs are under construction or under consideration, which will have significantly smaller emittances. These sources are targeted towards the diffraction limit in the X-ray regime and will provide roughly one to two orders of magnitude higher spectral brightness and coherence. They will be especially suited to experiments exploiting the coherence properties of the beams and to ultra-small focal spot sizes in the regime of several nanometres. Although the length of individual X-ray pulses at a storage-ring source is of the order of 100 ps, which is sufficiently short to track structural changes of larger groups, faster processes as they occur during vision or photosynthesis, for example, are not accessible in all details under these conditions. Linear accelerator (linac) driven free-electron laser (FEL) sources with extremely short and intense pulses of very high coherence circumvent some of the limitations of present-day storage-ring sources. It has been demonstrated that their individual pulses are short enough to outrun radiation damage for single-pulse exposures. These ultra-short pulses also enable time-resolved studies 1000 times faster than at standard storage-ring sources. Developments are ongoing at various places for a totally new type of X-ray source combining a linac with a storage ring. These energy-recovery linacs promise to provide pulses almost as short as a FEL, with brilliances and multi-user capabilities comparable with a diffraction-limited storage ring. Altogether, these new X-ray source developments will provide smaller and more intense X-ray beams with a considerably higher coherent fraction, enabling a broad spectrum of new techniques for studying the structure of crystalline and non-crystalline states of matter at atomic length scales. In addition, the short X-ray pulses of FELs will enable the study of fast atomic dynamics and non-equilibrium states of matter.

Calculating the Spectral Brightness of Atmospheric Discharges

2016 ◽  
Vol 58 (12) ◽  
pp. 1330-1335
Author(s):  
Yu. A. Plastinin ◽  
I. Yu. Skryabysheva
Keyword(s):  
Spectral Brightness ◽  
Atmospheric Discharges

Production and diagnosis of single-mode giant pulse lasers of high spectral brightness

1968 ◽  
Vol 4 (5) ◽  
pp. 366-366 ◽  
Author(s):  
D. Bradley ◽  
A. McCullough ◽  
C. Mitchell
Keyword(s):  
Single Mode ◽  
Spectral Brightness ◽  
Giant Pulse

scholarly journals Efficient Raman converter in the yellow range with high spatial and spectral brightness

2018 ◽  
Vol 57 (24) ◽  
pp. 6892 ◽  
Author(s):  
Minh Châu Phan Huy ◽  
Philippe Delaye ◽  
Gilles Pauliat ◽  
Sylvie Lebrun
Keyword(s):  
Spectral Brightness
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