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Related Concept Videos

Diode: Forward bias01:20

Diode: Forward bias

In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
The behavior of a diode in forward bias...
Diode: Reverse bias01:14

Diode: Reverse bias

A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
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...
BJT Amplifiers01:14

BJT Amplifiers

Bipolar Junction Transistors (BJTs) are pivotal components in amplifier circuits, functioning as voltage-controlled current sources in their active region. This characteristic allows them to efficiently control the collector current through variations in the base-emitter voltage. Essentially, BJTs amplify power due to their ability to take a weak input signal and output a much stronger signal.
In BJT amplifier configurations, particularly in common-emitter setups, the transistor's role extends...
Biasing of P-N Junction01:16

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
The Ideal Diode01:15

The Ideal Diode

A diode is a semiconductor device that allows current to flow in one direction only, making it a crucial component in electronic circuits for controlling the direction of current flow. An ideal diode is a simplified version of a real diode used to understand how diodes work in circuits. It possesses two terminals: the positive anode and the cathode, which is negative. When a positive voltage is applied to the anode relative to the cathode, the diode is in a forward-biased state, allowing...

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Related Experiment Video

Updated: Jun 19, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
10:17

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

Diode-pumped Nd:YLF regenerative amplifier.

M Gifford, K J Weingarten

    Optics Letters
    |October 3, 2009
    PubMed
    Summary

    This study demonstrates a diode-pumped neodymium-doped yttrium lithium fluoride (Nd:YLF) regenerative amplifier. The system achieves high-energy, ultrashort pulses with excellent contrast for various laser applications.

    Area of Science:

    • Laser Physics
    • Quantum Optics

    Background:

    • Regenerative amplifiers are crucial for generating high-energy laser pulses.
    • Nd:YLF lasers offer specific advantages for pulsed amplification.

    Purpose of the Study:

    • To develop and characterize a diode-pumped Nd:YLF regenerative amplifier.
    • To assess the performance of the amplifier in terms of pulse energy, duration, and repetition rate.

    Main Methods:

    • Utilized a diode-pumped Nd:YLF laser system.
    • Employed a Pockels cell for seed pulse switching with a half-wave configuration.
    • Achieved amplification through 50 round trips within the regenerative amplifier.

    Main Results:

    • Generated 88-microJ, 11-ps pulses at 1047 nm with a 1-kHz repetition frequency.

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    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

    Published on: July 12, 2017

    Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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  • Demonstrated a contrast ratio of 20:1 for seed pulse switching.
  • Achieved an overall energy gain of 73 dB.
  • Obtained 46 microJ/pulse at 524 nm and 8.1 microJ/pulse at 262 nm via frequency doubling and quadrupling at 1 kHz.
  • Produced 97 mW at 524 nm and 15.8 mW at 262 nm at a 3.5 kHz repetition rate.
  • Conclusions:

    • The diode-pumped Nd:YLF regenerative amplifier is a high-performance system for generating ultrashort, high-energy pulses.
    • Efficient frequency conversion to visible and UV wavelengths was achieved.
    • The amplifier shows promise for applications requiring high-power, tunable laser sources.