scholarly journals Gain control dynamics of thulium-doped fibre amplifier at 2 μm

2016 ◽  
Author(s):  
M. A. Khamis ◽  
K. Ennser
Keyword(s):  
Gain Control ◽  
Fibre Amplifier

scholarly journals Pulses on Demand in Fibre and Hybrid Lasers

2019 ◽  
Vol 65 (11-12) ◽  
pp. 680-689
Author(s):  
Rok Petkovšek ◽  
Vid Agrež ◽  
Jaka Petelin ◽  
Luka Černe ◽  
Udo Bünting ◽  
...  
Keyword(s):  
Gain Control ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Laser Source ◽  
Single Shot ◽  
Transfer Printing ◽  
On Demand ◽  
Laser Transfer ◽  
Hybrid Lasers ◽  
Fibre Amplifier

This paper presents an investigation of pulse-on-demand operation in fibre and hybrid lasers. Two methods for efficient gain control that enable the generation of laser pulses at arbitrary times with controlled pulse parameters are presented. The method of direct modulation of the pump power in the high-power laser oscillator is shown to generate pulses with a duration in the nanosecond range, with repetition rates varying during operation from a single shot to over 1 MHz. An advanced method using a combination of marker and idler seeding a fibre amplifier chain is investigated. Such a system can easily achieve repetition rates of several tens of MHz. The lasers’ performances were successfully tested in a real environment on an industrial platform for laser transfer printing. Similar concepts were used for a laser source with ultrashort laser pulses (femtosecond range) on demand by using a mode-locked seed as a source and a solid-state amplifier to achieve high pulse energy and peak power.

1480 nm pumped erbium doped fibre amplifier with all optical automatic gain control

1994 ◽  
Vol 30 (12) ◽  
pp. 962-964 ◽  
Author(s):  
J.F. Massicott ◽  
R.A. Lobbett ◽  
J.R. Armitage ◽  
S.D. Willson ◽  
R. Kashyap ◽  
...  
Keyword(s):  
Automatic Gain Control ◽  
Gain Control ◽  
Fibre Amplifier ◽  
Erbium Doped ◽  
All Optical

Automatic gain control in cascaded erbium doped fibre amplifier systems

1991 ◽  
Vol 27 (3) ◽  
pp. 193 ◽  
Author(s):  
A.D. Ellis ◽  
R.M. Percival ◽  
A. Lord ◽  
W.A. Stallard
Keyword(s):  
Automatic Gain Control ◽  
Gain Control ◽  
Fibre Amplifier ◽  
Erbium Doped

Video-Enhanced Microscopy--Better Visibility of Plant Cell Structures

1982 ◽  
Vol 40 ◽  
pp. 182-185
Author(s):  
N.S. Allen ◽  
R.D. Allen
Keyword(s):  
Diffraction Pattern ◽  
Theoretical Basis ◽  
Numerical Aperture ◽  
Gain Control ◽  
Control Unit ◽  
Camera Control ◽  
Variable Gain ◽  
Contrast Method ◽  
Fine Detail ◽  
Cell Structures

Various methods of video-enhanced microscopy combine TV cameras with light microscopes creating images with improved resolution, contrast and visibility of fine detail, which can be recorded rapidly and relatively inexpensively. The AVEC (Allen Video-enhanced Contrast) method avoids polarizing rectifiers, since the microscope is operated at retardations of λ/9- λ/4, where no anomaly is seen in the Airy diffraction pattern. The iris diaphram is opened fully to match the numerical aperture of the condenser to that of the objective. Under these conditions, no image can be realized either by eye or photographically. Yet the image becomes visible using the Hamamatsu C-1000-01 binary camera, if the camera control unit is equipped with variable gain control and an offset knob (which sets a clamp voltage of a D.C. restoration circuit). The theoretical basis for these improvements has been described.

Orienting and Focusing in Voluntary and Involuntary Visuospatial Attention Conditions

2010 ◽  
Vol 24 (3) ◽  
pp. 198-209 ◽  
Author(s):  
Yan Wang ◽  
Jianhui Wu ◽  
Shimin Fu ◽  
Yuejia Luo
Keyword(s):  
Gain Control ◽  
Event Related Potentials ◽  
Stimulus Onset ◽  
Orientation Discrimination ◽  
Involuntary Attention ◽  
Attention Condition ◽  
Voluntary Attention ◽  
Visual Spatial ◽  
Related Potentials ◽  
Underlying Mechanisms

In the present study, we used event-related potentials (ERPs) and behavioral measurements in a peripherally cued line-orientation discrimination task to investigate the underlying mechanisms of orienting and focusing in voluntary and involuntary attention conditions. Informative peripheral cue (75% valid) with long stimulus onset asynchrony (SOA) was used in the voluntary attention condition; uninformative peripheral cue (50% valid) with short SOA was used in the involuntary attention condition. Both orienting and focusing were affected by attention type. Results for attention orienting in the voluntary attention condition confirmed the “sensory gain control theory,” as attention enhanced the amplitude of the early ERP components, P1 and N1, without latency changes. In the involuntary attention condition, compared with invalid trials, targets in the valid trials elicited larger and later contralateral P1 components, and smaller and later contralateral N1 components. Furthermore, but only in the voluntary attention condition, targets in the valid trials elicited larger N2 and P3 components than in the invalid trials. Attention focusing in the involuntary attention condition resulted in larger P1 components elicited by targets in small-cue trials compared to large-cue trials, whereas in the voluntary attention condition, larger P1 components were elicited by targets in large-cue trials than in small-cue trials. There was no interaction between orienting and focusing. These results suggest that orienting and focusing of visual-spatial attention are deployed independently regardless of attention type. In addition, the present results provide evidence of dissociation between voluntary and involuntary attention during the same task.

Thermal properties of an erbium-doped fibre amplifier

1990 ◽  
Vol 137 (3) ◽  
pp. 155 ◽  
Author(s):  
C.A. Millar ◽  
T.J. Whitley ◽  
S.C. Fleming
Keyword(s):  
Thermal Properties ◽  
Fibre Amplifier ◽  
Erbium Doped

The process of investigating Diocesan Curia in Lublin by the PRL’s apparatus of repression in the years 1946-1974

2013 ◽  
Vol 67 (1) ◽  
Author(s):  
Elżbieta Kosobudzka
Keyword(s):  
Catholic Church ◽  
Gain Control ◽  
Source Analysis ◽  
Secret Police ◽  
Personal Lives ◽  
Catholic Clergy ◽  
Recorded Data ◽  
The Government ◽  
Operational Activities ◽  
Intensive Surveillance

SUMMARYThe article below focuses on the source analysis of the process of investigating Diocesan Curia in Lublin in the years 1946-1947, during the period when two Lublin ordinaries were in charge: Bishop Stefan Wyszyński (1946-1948) and Bishop Piotr Kałwa (1949-1974). Diocesan Curia, as the most important institution in the Church administrative hierarchy, was subject to intensive surveillance by PRL’s apparatus of repression.At the beginning, the process of investigating the management structure on the diocese level was not conducted by specially selected departments but was performed as a part of broadly conceived actions directed against Catholic clergy. In the years 1946-1948,when bishop Stefan Wyszyński was in charge, operational activities against the clergy and the bishops were led by 5th Section of 5th Department of Voivodeship Public Security Office (Sekcja V Wydziału V Wojewódzkiego Urzędu Bezpieczeństwa) in Lublin (until the February of 1953). It can be inferred from the recorded data that until 1949 the Diocesan Curia’s circle in Lublin was very poorly uncovered by Polish communist secret police and their activity amounted only to gathering and verifying data received from informants. The shortage of well-trained agents prevented taking more intensive actions against Bishop Wyszyński and Diocesan Curia in Lublin.In the years 1949-1974, when Bishop Piotr Kałwa was in charge, the 5th Section of the 5th Department of VPSO continued their operational activities aimed against the Lublin’s Curia. In 1953 a new department was created on the basis of 5th Section. The so-called 11th Department took over the entirety of cases pertaining to the Catholic Church. In 1955 the 11th Department was transformed into 6th Department of VPSO in Lublin. 3rd Department of VPSO in Lublin and 1st Section of 6th Department of Polish communist secret police of Voivodeship Polish Citizen Militia Headquarters in Lublin (referat Służby Bezpieczeństwa w Komendzie Wojewódzkiej Milicji Obywatelskiej), respectively, also conducted investigation activities concerning the bishops and Curia.As of 1949, the Diocesan Curia in Lublin was subject to intensive surveillance by the PRL’s security service apparatus. Its main aim at that point was to restrict the Curia’s activity so as to gain control over it. In order to achieve that, the activity of Curial employees and bishops was documented and revealed. Additionally, the conflicts between the bishops, Curial employees and KUL’s management were incited and deepened. What is more, the secret police attentively scrutinized bishops’ and Curial employees’ personal lives in order to gather compromising data, gained secret collaborators (47 secret agents were involved in the process) and limited Curia employees’ departures for studies abroad. Almost every type of operation activities was used against Bishop Piotr Kałwa. The secret police applied phone tapping, bugging, surveillance, reading mail and sending anonymous letters in order to undermine his authority. What is more, the secret police tried to set bishop Kałwa at variance with Primate Wyszyński. However, these actions did not change Bishops Kałwa’s stance who, until his death, unwaveringly defended the Catholic Church’s independence from the government.

The Dual Use of Religious-Faith in Intimate Partner Abuse Perpetration: Perspectives of Latino Men in a Parish-based Intervention Program

2020 ◽  
Vol 47 (4) ◽  
pp. 71-95
Author(s):  
Maxine Davis ◽  
Melissa Jonson-Reid
Keyword(s):  
Partner Violence ◽  
Intervention Program ◽  
Protective Factor ◽  
Partner Abuse ◽  
Religious Faith ◽  
Gain Control ◽  
Intimate Partner ◽  
Latino Men ◽  
Spiritual Abuse ◽  
The Relationship

Little is known about the role that religious-faith plays in the lives of men who have acted abusively against an intimate partner. Studies report mixed findings about the relationship between religious-faith and intimate partner violence/abuse (IPV/A) perpetration. This study explored the perceptions of Latino men involved in a parish-based partner abuse intervention program (PAIP). Two focus groups were conducted with members of the PAIP (N=18). Two major themes emerged. Participants reported using religious-faith as a mechanism for ending violence. However, participants also reported past misuse of religion in order to gain control over intimate partners. These apparently conflicting roles of religion were further elucidated in several sub-themes. Religious-faith is complex. This study offers insight into how faith may serve as both a risk and protective factor for IPV/A perpetration. Implications for how intervention programs may address participants’ religious-faith during treatment and how religio-spiritual abuse is measured are discussed.

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