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Related Concept Videos

Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
RLC Circuit as a Damped Oscillator01:30

RLC Circuit as a Damped Oscillator

An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
Active Filters01:25

Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
MOSFET Amplifiers01:17

MOSFET Amplifiers

The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
Cascaded Op Amps01:16

Cascaded Op Amps

Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...

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Fabrication and Testing of Microfluidic Optomechanical Oscillators
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Low cost active-active oscillator utilizing loss feedback control.

D L Smith, J H Kelly, M J Shoup Iii

    Applied Optics
    |June 18, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel, low-cost phosphate glass laser oscillator was developed using active mode-locking and Q-switching. This system efficiently produces high-energy, picosecond pulses by employing an acousto-optic feedback system to control relaxation oscillations.

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    Area of Science:

    • Laser Physics
    • Materials Science

    Background:

    • Mode-locked and Q-switched lasers are crucial for various scientific applications.
    • Phosphate glasses offer potential as laser gain media due to their properties.

    Purpose of the Study:

    • To develop a low-cost, actively mode-locked and Q-switched laser oscillator.
    • To achieve high-energy pulse generation in the picosecond regime.

    Main Methods:

    • Construction of a phosphate glass laser oscillator.
    • Implementation of active mode-locking and Q-switching techniques.
    • Utilizing an acousto-optic feedback system to manage relaxation oscillations.

    Main Results:

    • The oscillator successfully produced pulses with durations ranging from 150 to 1000 picoseconds.
    • High pulse energy was achieved.
    • The acousto-optic feedback system effectively reduced the time for relaxation oscillations to decay.

    Conclusions:

    • A cost-effective, actively mode-locked and Q-switched phosphate glass laser oscillator has been successfully constructed.
    • The developed system demonstrates efficient generation of high-energy picosecond pulses.
    • The acousto-optic feedback mechanism is key to the oscillator's performance.