Ultrafast time-resolved spectroscopy of white-light continuum by optical Kerr grating

2017 ◽  
Author(s):  
Yusu Wang ◽  
Laizhi Sui ◽  
Yuanfei Jiang ◽  
Dunli Liu ◽  
Qingyi Li ◽  
...  
Keyword(s):  
White Light ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
White Light Continuum

Excited state dynamics of nanocrystalline VO 2 with white light continuum time resolved spectroscopy

2014 ◽  
Vol 333 ◽  
pp. 109-114 ◽  
Author(s):  
Ulaş Kürüm ◽  
H. Gul Yaglioglu ◽  
Betül Küçüköz ◽  
R. Mustafa Oksuzoglu ◽  
Mustafa Yıldırım ◽  
...  
Keyword(s):  
Excited State ◽  
White Light ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Excited State Dynamics ◽  
White Light Continuum

Time-resolved spectroscopy based on white-light generation of short pulses in a photonic crystal fiber

2005 ◽  
Author(s):  
Johannes Swartling ◽  
Andrea Bassi ◽  
Cosimo d'Andrea ◽  
Antonio Pifferi ◽  
Alessandro Torricelli ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
White Light ◽  
Time Resolved ◽  
Short Pulses ◽  
Time Resolved Spectroscopy ◽  
Crystal Fiber ◽  
White Light Generation ◽  
Light Generation

scholarly journals Self-induced birefringence of white-light continuum generated by interaction of focused femtosecond laser pulses with fused silica

2020 ◽  
Vol 8 ◽  
Author(s):  
J. Qian ◽  
G. D. Wang ◽  
K. Y. Lou ◽  
D. Y. Shen ◽  
Q. Fu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Time Evolution ◽  
White Light ◽  
Laser Energy ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Fused Silica ◽  
Time Resolved ◽  
White Light Continuum ◽  
Anisotropic Structures

White-light continuum can be induced by the interaction of intense femtosecond laser pulses with condensed materials. By using two orthogonal polarizers, a self-induced birefringence of continuum is observed when focusing femtosecond laser pulses into bulk fused silica. That is, the generated white-light continuum is synchronously modulated anisotropically while propagating in fused silica. Time-resolved detection confirms that self-induced birefringence of continuum shows a growth and saturation feature with time evolution. By adjusting laser energy, the transmitted intensity of continuum modulated by self-induced birefringence also varies correspondingly. Morphology analysis with time evolution indicates that it is the focused femtosecond laser pulses that induce anisotropic microstructures in bulk fused silica, and the anisotropic structures at the same time modulate the generated continuum.

scholarly journals State-of-the-Art Observations and Modeling of Stellar Flares

2012 ◽  
Vol 10 (H16) ◽  
pp. 99-100
Author(s):  
Adam F. Kowalski ◽  
Suzanne L. Hawley
Keyword(s):  
White Light ◽  
Binary Systems ◽  
Light Emission ◽  
Continuum Emission ◽  
M Dwarfs ◽  
Time Resolved ◽  
Color Distribution ◽  
Nonthermal Electrons ◽  
White Light Continuum ◽  
Stellar Flares

Flares are observed on a wide variety of stellar types, ranging from closely orbiting binary systems consisting of an evolved member (RS CVn's) and young, nearby super-active M dwarfs (dMe's). The timescales and energies of flares span many orders of magnitude and typically far exceed the scales of even the largest solar flares observed. In particular, the active M dwarfs produce an energetic signature in the near-UV and optical continuum, which is often referred to as the white-light continuum. White-light emission has been studied in Johnson UBVR filters during a few large-amplitude flares, and the best emission mechanism that fits the broadband color distribution is a T~104 K blackbody (Hawley & Fisher 1992). Time-resolved blue spectra have revealed a consistent picture, with little or no Balmer jump and a smoothly rising continuum toward the near-UV (Hawley & Pettersen 1991). However, the most recent self-consistent radiative-hydrodynamic (RHD) models, which use a solar-type flare heating function from accelerated, nonthermal electrons, do not reproduce this emission spectrum. Instead, these models predict that the white-light is dominated by Balmer continuum emission from Hydrogen recombination in the chromosphere (Allred et al. 2006). Moreover, Allred et al. (2006) showed that the Johnson colors of the model prediction exhibit a broadband distribution similar to a blackbody with T~9000 K.

Convenient Method of Measuring the Chirp Structure of Femtosecond White-Light Continuum Pulses

1995 ◽  
Vol 49 (10) ◽  
pp. 1513-1515 ◽  
Author(s):  
Shoichi Yamaguchi ◽  
Hiro-O Hamaguchi
Keyword(s):  
Absorption Spectroscopy ◽  
White Light ◽  
Convenient Method ◽  
Kerr Effect ◽  
Nonlinear Crystal ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Optical Kerr Effect ◽  
Time Resolved ◽  
White Light Continuum

We have developed a convenient method of measuring the temporal chirp structure of white-light continuum pulses used in femtosecond time-resolved absorption spectroscopy. This method, based on the nonresonant optical Kerr effect, is superior in many respects to the existing one that uses the sum or difference frequency generation by a nonlinear crystal.

White-light continuum probed femtosecond time-resolved absorption spectroscopic measurement of β-carotene under high pressure

2012 ◽  
Vol 532 ◽  
pp. 47-51 ◽  
Author(s):  
Wei-Long Liu ◽  
Zhi-Ren Zheng ◽  
Jian-Ping Zhang ◽  
Wen-Zhi Wu ◽  
Ai-Hua Li ◽  
...  
Keyword(s):  
High Pressure ◽  
White Light ◽  
Spectroscopic Measurement ◽  
Time Resolved ◽  
White Light Continuum ◽  
Β Carotene

scholarly journals Photophysical properties and fluorosolvatochromism of D–π–A thiophene based derivatives

RSC Advances ◽  
2020 ◽  
Vol 10 (71) ◽  
pp. 43459-43471
Author(s):  
Hussain A. Z. Sabek ◽  
Ahmed M. M. Alazaly ◽  
Dina Salah ◽  
Hesham S. Abdel-Samad ◽  
Mohamed A. Ismail ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Fluorescence Emission ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Solvation Models

Solvation-dependent photophysical properties of two push–pull thiophene-based compounds with donor–π–acceptor (D–π–A) structures were investigated using absorption, fluorescence emission and time resolved spectroscopy, and supported by different solvation models.

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