Open-aperture Z-scan Study for Absorption Saturation: Accurate Measurement of Saturation Intensity in YLF:Yb for Optical Refrigeration

2021 ◽  
Author(s):  
Azzurra Volpi ◽  
Jackson Kock ◽  
Alexander Albrecht ◽  
Markus Hehlen ◽  
Richard Epstein ◽  
...  
Keyword(s):  
Open Aperture ◽  
Absorption Saturation ◽  
Optical Refrigeration ◽  
Saturation Intensity

The role of absorption saturation in optical refrigeration (Conference Presentation)

2020 ◽  
Author(s):  
Azzurra Volpi ◽  
Jackson Kock ◽  
Alexander R. Albrecht ◽  
Markus P. Hehlen ◽  
Richard I. Epstein ◽  
...  
Keyword(s):  
Absorption Saturation ◽  
Optical Refrigeration

Physical methods of research and monitoring

2019 ◽  
Vol 85 (1(I)) ◽  
pp. 35-44
Author(s):  
S. G. Sandomirski
Keyword(s):  
Heat Treatment ◽  
Coercive Force ◽  
Remanent Magnetization ◽  
Structural Changes ◽  
Mechanical Load ◽  
Magnetic Hysteresis ◽  
Steel Structures ◽  
Magnetic Characteristics ◽  
Magnetic Parameters ◽  
Saturation Intensity

The main magnetic parameters sensitive to the structure of steels are the parameters of their saturation loop of magnetic hysteresis: the coercive force Hcs and remanent magnetization Mrs. The saturation magnetization or saturation intensity Mr is most sensitive to the phase composition of steels. The variety of steel grades and modes of technological treatment (e.g., heat treatment, mechanical load) determined the use of magnetic structurescopy and magnetic characteristics — the coercive force Hc, remanent magnetization Mr , and specific hysteresis losses Wh on the subloops of the magnetic hysteresis of steels — as control parameters in diagnostics of the stressed and structural states of steel structures and pipelines. It has been shown that changes in Hc, Mr , and Wh are more sensitive to structural stresses and structures of steels than the parameters of the saturation hysteresis loop of magnetic hysteresis (Hcs, Mrs, and Mrs). The formulas for calculating Hc, Mr and Wh are presented to be used for estimation of changes in the parameters upon heat treatment of steels. Features of the structural sensitivity of the subloop characteristics and expediency of their use for magnetic structural and phase analyzes are determined. Thus, the range of changes in Ìr attributed to the structural changes in steels upon gradual Hm decrease is many times wider compared to the range of possible changes in Mrs under the same conditions. Conditions (relations between the magnetic parameters) and recommendations regarding the choice of the field strength Hm are given which provide the justified use of Hc, Mr and Wh parameters in magnetic structurescopy

scholarly journals Dynamics of carbon nanotube-based mode-locking fiber lasers

Nanophotonics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 2731-2761 ◽  
Author(s):  
Lin Huang ◽  
Yusheng Zhang ◽  
Xueming Liu
Keyword(s):  
Carbon Nanotube ◽  
Fiber Lasers ◽  
Modulation Depth ◽  
Laser System ◽  
Physical Nature ◽  
Mode Locking ◽  
Environmental Stability ◽  
Saturation Intensity ◽  
Soliton Dynamics ◽  
Deep Modulation

AbstractCarbon nanotube (CNT) can work as excellent saturable absorber (SA) due to its advantages of fast recovery, low saturation intensity, polarization insensitivity, deep modulation depth, broad operation bandwidth, outstanding environmental stability, and affordable fabrication. Its successful application as SA has promoted the development of scientific research and practical application of mode-locked fiber lasers. Besides, mode-locked fiber laser constitutes an ideal platform for investigating soliton dynamics which exhibit profound nonlinear optical dynamics and excitation ubiquitous in many fields. Up to now, a variety of soliton dynamics have been observed. Among these researches, CNT-SA is a key component that suppresses the environmental perturbation and optimizes the laser system to reveal the true highly stochastic and non-repetitive unstable phenomena of the initial self-starting lasing process. This review is intended to provide an up-to-date introduction to the development of CNT-SA based ultrafast fiber lasers, with emphasis on recent progress in real-time buildup dynamics of solitons in CNT-SA mode-locked fiber lasers. It is anticipated that study of dynamics of solitons can not only further reveal the physical nature of solitons, but also optimize the performance of ultrafast fiber lasers and eventually expand their applications in different fields.

Optical refrigeration of the Yb3+-doped YAG crystal close to the thermoelectric cooling limit

2021 ◽  
Vol 118 (13) ◽  
pp. 131104
Author(s):  
Biao Zhong ◽  
Yongqing Lei ◽  
Xuelu Duan ◽  
Tao Yang ◽  
Jianping Yin
Keyword(s):  
Thermoelectric Cooling ◽  
Optical Refrigeration

Absorption saturation in germanium, silicon, and gallium arsenide at 10.6 μm

1972 ◽  
Vol 21 (8) ◽  
pp. 356-357 ◽  
Author(s):  
A.F. Gibson ◽  
C.A. Rosito ◽  
C.A. Raffo ◽  
M.F. Kimmitt
Keyword(s):  
Gallium Arsenide ◽  
Absorption Saturation ◽  
Germanium Silicon
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