scholarly journals Controllability of random laser output waveshape under femtosecond laser pumping

2011 ◽  
Vol 60 (7) ◽  
pp. 074203
Author(s):  
Zhu Qi-Hua ◽  
Zhang Qing-Quan ◽  
Lü Jian-Tao ◽  
Wang Ke-Jia ◽  
Liu Jin-Song ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Output ◽  
Random Laser ◽  
Laser Pumping

Luminescence response of synthetic opal under femtosecond laser pumping

2015 ◽  
Vol 166 ◽  
pp. 233-237 ◽  
Author(s):  
M.V. Vasnetsov ◽  
V.Yu. Bazhenov ◽  
I.N. Dmitruk ◽  
A.D. Kudryavtseva ◽  
N.V. Tcherniega
Keyword(s):  
Femtosecond Laser ◽  
Synthetic Opal ◽  
Laser Pumping

Femtosecond Magnetooptics and the Orbital Model of the Ultrafast Magnetic Dynamics

2016 ◽  
Vol 845 ◽  
pp. 189-194
Author(s):  
Mikhail Ivanovich Kurkin ◽  
Natalia Borisovna Orlova
Keyword(s):  
Femtosecond Laser ◽  
Qualitative Analysis ◽  
Magnetization Reversal ◽  
Critical Analysis ◽  
Quantitative Description ◽  
Frequency Range ◽  
Magnetic Dynamics ◽  
Femtosecond Optics ◽  
Laser Pumping

The critical analysis of the magnetization reversal processes and magnetooptics of ferromagnets was carried out. The condition of the formation of nonequilibrium orbital momenta lpf after turning off the femtosecond laser pumping was found. The frequency range for processes involving lpf was estimated as 106 Hz to 1015 Hz. Such objects were not known in the magnetism before using the methods of femtosecond optics. The estimated frequency range covers all the processes related to femtosecond magnetism. Our qualitative analysis of these processes allows us to hope that their quantitative description does not require significant changes in the existing theories of magnetism.

Organic random laser in an optofluidic chip fabricated by femtosecond laser

2010 ◽  
Author(s):  
Krishna Chaitanya Vishnubhatla ◽  
Roberto Osellame ◽  
Guglielmo Lanzani ◽  
Roberta Ramponi ◽  
Tersilla Virgili
Keyword(s):  
Femtosecond Laser ◽  
Random Laser ◽  
Optofluidic Chip

PARTIALLY PUMPED RANDOM LASERS

2014 ◽  
Vol 28 (05) ◽  
pp. 1430001 ◽  
Author(s):  
JONATHAN ANDREASEN ◽  
NICOLAS BACHELARD ◽  
SHIVAKIRAN B. N. BHAKTHA ◽  
HUI CAO ◽  
PATRICK SEBBAH ◽  
...  
Keyword(s):  
Laser Cavity ◽  
Laser Output ◽  
Mode Interaction ◽  
Experimental Investigations ◽  
Random Laser ◽  
Difficult Case ◽  
Scattering Medium ◽  
Random Lasers ◽  
Gain Material ◽  
The Impact

Conventional lasers consist of two components: a gain material that is pumped in order to provide amplification of light and a cavity to provide feedback. Random lasers replace the traditional laser cavity with a random, multiple-scattering medium. This can give rise to complex lasing behavior, such as unpredictable multidirectional and multifrequency output. Controlling these systems has proved difficult and, until now, has consisted of material and structural manipulations. In random lasers, the most common pumping mechanism is an optical field, which can be applied uniformly or partially across the scattering medium. Partial pumping, referring to the restricted spatial extent of the pump applied to the gain material, is therefore quite ubiquitous in such systems. In contrast to conventional lasers, however, the impact of partial pumping can be significant in random lasers as a subset of the scattering medium is probed. In this review, we discuss state-of-the-art investigations of partially pumped random lasers. Numerical and experimental investigations of how even a simple spot profile of the pump can dramatically alter random laser output are presented. First, the simple case of partial pumping in strongly scattering systems where laser modes are spatially confined is described. Then the most common but more difficult case of weakly scattering random lasers is considered. Here, modes are spatially extended, forcing greater mode interaction and making the random laser output more difficult to predict. Finally, we review recent works that show how the pumping degree of freedom allows a general increase in control over random lasers.

scholarly journals Air-guided photonic-crystal-fiber pulse-compression delivery of multimegawatt femtosecond laser output for nonlinear-optical imaging and neurosurgery

2012 ◽  
Vol 100 (10) ◽  
pp. 101104 ◽  
Author(s):  
Aleksandr A. Lanin ◽  
Il’ya V. Fedotov ◽  
Dmitrii A. Sidorov-Biryukov ◽  
Lyubov V. Doronina-Amitonova ◽  
Olga I. Ivashkina ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Femtosecond Laser ◽  
Optical Imaging ◽  
Photonic Crystal Fiber ◽  
Nonlinear Optical ◽  
Pulse Compression ◽  
Laser Output ◽  
Crystal Fiber ◽  
Nonlinear Optical Imaging

Random laser action under picosecond laser pumping

2020 ◽  
Vol 52 (10) ◽  
Author(s):  
R. A. Ejbarah ◽  
J. M. Jassim ◽  
S. M. Hamidi
Keyword(s):  
Laser Action ◽  
Picosecond Laser ◽  
Random Laser ◽  
Laser Pumping

A 1 μm laser output based on an Er-doped fiber femtosecond laser

2017 ◽  
Vol 397 ◽  
pp. 161-165 ◽  
Author(s):  
H. Liu ◽  
S. Cao ◽  
W. Wang ◽  
B. Lin ◽  
W. Lu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Output ◽  
Er Doped
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