Mode-locked ring laser with output pulse width of 0.4 ps

1999 ◽  
Vol 48 (6) ◽  
pp. 1018-1022 ◽  
Author(s):  
K. Kuroda ◽  
H. Takakura
Keyword(s):  
Pulse Width ◽  
Ring Laser ◽  
Output Pulse

PWM Chopper of Ultrasonic Power Supply Based on FPGA

2012 ◽  
Vol 476-478 ◽  
pp. 1305-1308
Author(s):  
Chun Feng Sun ◽  
Wei Guang Zhang
Keyword(s):  
Power Supply ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Output Pulse ◽  
Open Loop ◽  
Control Circuit ◽  
Ultrasonic Power ◽  
Pwm Control ◽  
Power Regulation ◽  
Regulation Method

Pulse width modulation (PWM) is often one of the important power regulation method of ultrasonic power supply. The traditional PWM control circuit has the shortcomings of complex design structure, slow dynamic response and low reliability. An advanced PWM technique for choppers of ultrasonic power supply based on FPGA is proposed. Through open-loop operation, it regulates the output pulse width of ultrasonic power supply dynamically. The simulation result shows that the PWM control circuit based on FPGA can realize to adjust the width of PWM signal and power regulation conveniently.

Dual-Mode Controlled Pulse Width Monostable Multivibrator Using DVCCs

2015 ◽  
Vol 24 (09) ◽  
pp. 1550143 ◽  
Author(s):  
Hung-Chun Chien
Keyword(s):  
Integrated Circuits ◽  
Pulse Width ◽  
Experimental Tests ◽  
Output Pulse ◽  
Voltage Source ◽  
Current Conveyors ◽  
Monostable Multivibrator ◽  
Dual Mode ◽  
Passive Components ◽  
Theoretical Analyses

This paper proposes a dual-mode controlled pulse width monostable multivibrator used for analogue signal processing applications that employs two differential voltage current conveyors (DVCCs), four passive components and an analogue switch. Unlike the traditional operational-amplifier-based monostable multivibrators, the proposed circuit contributes a dual-mode controlled scheme for adjusting the output pulse width through a voltage source and a grounded resistor. This paper discusses several previous designs and presents the circuit operations, related governing formulas, non-ideal effect problems, design considerations, and experimental examples of the proposed circuit. A prototype circuit was implemented, and commercially integrated circuits and discrete passive components were used to execute the experimental tests. The features of the proposed circuit are discussed, and the experimental results indicated that the circuit is feasibly used in dual-mode controlled pulse width for the output pulse and were consistent with those of the theoretical analyses.

scholarly journals Using Nonuniform Fiber to Generate Slow Light via SBS

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Wenhai Li ◽  
Xiaoyi Bao ◽  
V. P. Kalosha ◽  
Liang Chen ◽  
Ming-Jun Li
Keyword(s):  
Pulse Width ◽  
Slow Light ◽  
Brillouin Scattering ◽  
Beat Frequency ◽  
Single Mode ◽  
Output Pulse ◽  
Single Mode Fiber ◽  
Pulse Delay ◽  
Slope Coefficient ◽  
Stimulated Brillouin

The data pulse delay based on slow light induced by stimulated Brillouin scattering (SBS) in a nonuniform dispersion decreasing fiber (DDF) is demonstrated experimentally, and the distortions of data pulses at different beat frequencies are studied. We found that a delay exceeding a pulse width can be achieved at particular beat frequency, and the DDF has larger delay versus gain slope coefficient with much better output pulse quality than single-mode fiber.

scholarly journals EXPERIMENTAL IDENTIFICATION OF SENSITIVITY OF TILT SENSOR

2019 ◽  
pp. 114-120
Author(s):  
Michal Kelemen
Keyword(s):  
Tilt Angle ◽  
Pulse Width ◽  
Output Pulse ◽  
Angle Sensor ◽  
Target Setting ◽  
Sensing System ◽  
Zero Shift ◽  
Sensor Properties ◽  
Tilt Sensor ◽  
Is Value

Urgency of the research. Robots and vehicles which locomote on high slope ground has tendency to overturning and they lost stability during the locomotion. The problem also occurs in area of automotive industry. Target setting. All vehicles moving on the rough and inclined ground has a problem with stability. Emergency system for warning before dangerous tilt angle can be mounted inside the vehicles and robots as prevention of side overturning. Actual scientific researches and issues analysis. The problem is to find the reliable sensor for detection of dangerous tilt angle. Task is to identify the sensor properties as sensitivity, zero shift and also uncertainty of measurement. Before using it is necessary to identify sensor properties. Uninvestigated parts of general matters defining. The questions of the filtering of data acquisition by tilt angle sensor are uninvestigated, because the next research will be focused to this topic. The research objective. Sine bar is used for verification and testing of tilt sensor. Sine bar angle is adjusted using the parallel length gauge blocks. Sensor reacts to the changed tilt angle proportionally with pulse width on output pulse width signal. Indication of sensed data is made via using the microcontroller and LCD display. Also all calculations are executed inside the microcontroller. The statement of basic materials. The tilt sensor can be mounted inside the problematic vehicles to detect dangerous tilt angle and also automatic system for change the center of gravity position can be designed. The system will compensate the dangerous tilt angle. Conclusions. Evaluated uncertainties are related to overall sensing system and not only for sensor. Only sensor alone cannot be tested, because the sensor has no indication module. Expanded uncertainty of the system for measurement of tilt has been obtained and it is value should be taken into account before the sensor using.

Actively Q-switched Nd:YLF laser emitting at 908 nm

Laser Physics ◽  
2021 ◽  
Vol 32 (1) ◽  
pp. 015801
Author(s):  
Jiale Zhang ◽  
Jian Ma ◽  
Tingting Lu ◽  
Xiaolei Zhu
Keyword(s):  
Pulse Width ◽  
Energy Input ◽  
Output Pulse ◽  
Maximum Output ◽  
Double Crystal ◽  
Pump Pulse Energy ◽  
Cavity Structure ◽  
Parasitic Oscillation ◽  
First Time ◽  
Pulse Energies

Abstract An actively Q-switched quasi-three-level Nd:YLF laser emitting at 908 nm, for the first time to our knowledge, was demonstrated. A RTP double-crystal scheme was used to realize electro-optical Q-switcher, and a L-shaped cavity structure was designed to suppress parasitic oscillation at 1047 nm. An 806 nm laser diode was used as the pump source with about 480 μs pulse width. With 46.4 mJ pump pulse energy input at repetition rate of 100 Hz, maximum output pulse energies of 0.84 mJ and 0.73 mJ were obtained with output transmissions of 6.5% and 11%, respectively. The corresponding peak pulse powers were up to 14.3 kW and 12.1 kW, and the output pulse widths were 58.6 ns and 60.3 ns. The central laser wavelengths were both at 908.3 nm with spectral bandwidth of over 0.7 nm.

Picosecond pulse-width ultra-low repetition rate passive mode-locked fibre ring laser

2020 ◽  
Vol 56 (18) ◽  
pp. 947-948
Author(s):  
M.M. Correia ◽  
P. Tovar ◽  
F. Calliari ◽  
G.C. Amaral ◽  
J.P. von der Weid
Keyword(s):  
Repetition Rate ◽  
Pulse Width ◽  
Ring Laser ◽  
Picosecond Pulse ◽  
Passive Mode ◽  
Fibre Ring ◽  
Fibre Ring Laser
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