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Related Concept Videos

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...
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...
Small-Signal Analysis of MOSFET Amplifiers01:23

Small-Signal Analysis of MOSFET Amplifiers

In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear.
Inverting and Non-inverting OpAmps01:20

Inverting and Non-inverting OpAmps

In an inverting amplifier, the input voltage is connected through a resistor to the inverting terminal. Meanwhile, the non-inverting terminal is grounded and a feedback resistor is established between the inverting and output terminal, as depicted in Figure 1.

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Related Experiment Video

Updated: Jun 12, 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

Nonlinear regenerative amplification using tunable intracavity cascaded quadratic nonlinearities.

Chengyong Feng, Robert Holcomb, Christophe Dorrer

    Optics Express
    |June 11, 2026
    PubMed
    Summary

    This study introduces nonlinearity-tunable regenerative amplification using cascaded quadratic nonlinearities, enabling tunable spectral broadening and high-energy ultrashort pulse generation without self-focusing. This method enhances laser performance for diverse applications.

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    Area of Science:

    • Laser Physics
    • Nonlinear Optics

    Background:

    • Conventional regenerative amplifiers use Kerr nonlinearity for spectral broadening.
    • Kerr nonlinearity can lead to undesirable self-focusing effects.
    • Spectral gain narrowing limits high-energy ultrashort pulse generation.

    Purpose of the Study:

    • To introduce and demonstrate nonlinearity-tunable regenerative amplification.
    • To utilize cascaded quadratic nonlinearities for controlled spectral broadening.
    • To generate high-energy, ultrashort pulses free of self-focusing.

    Main Methods:

    • Implementing cascaded quadratic nonlinearities via type-I second-harmonic generation.
    • Tuning nonlinearity magnitude and sign using phase-mismatching.
    • Developing a nonlinear Yb:YAG thin-disk regenerative amplifier.

    Main Results:

    • Demonstrated experimental and numerical validation of the technique.
    • Achieved 1-kHz, >0.4-mJ pulses with durations of ~200 fs.
    • Generated high-quality beams free of self-focusing, with tunable net nonlinearity (positive or negative).

    Conclusions:

    • Cascaded quadratic nonlinearities offer a controllable alternative to Kerr nonlinearity in regenerative amplifiers.
    • The developed amplifier can be scaled to >100 W average power.
    • This technique advances ultrashort pulse generation for various applications.