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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

1.8K
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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BJT Amplifiers01:14

BJT Amplifiers

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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...
1.3K
Instrumentation Amplifier01:25

Instrumentation Amplifier

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An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...
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MOSFET Amplifiers01:17

MOSFET Amplifiers

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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...
783
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

2.6K
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Related Experiment Video

Updated: May 1, 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

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Integrated ytterbium-Raman fiber amplifier.

Lei Zhang, Huawei Jiang, Shuzhen Cui

    Optics Letters
    |April 2, 2014
    PubMed
    Summary

    This study introduces a new ytterbium-Raman fiber amplifier for boosting Raman fiber laser power. A proof-of-principle experiment achieved 300 W output, showing potential for kilowatt-level scaling.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Raman fiber lasers offer unique wavelength flexibility.
    • Power scaling of fiber lasers is crucial for various applications.
    • Integrated amplifier architectures can enhance laser performance.

    Purpose of the Study:

    • To propose and demonstrate an integrated ytterbium-Raman fiber amplifier architecture.
    • To achieve power scaling of a Raman fiber laser system.
    • To investigate the power transfer mechanism between different wavelengths.

    Main Methods:

    • An all-fiber amplifier seeded with a multi-wavelength laser was designed.
    • The architecture combines ytterbium (Yb) fiber amplification with a passive Raman fiber.
    • Numerical and experimental investigations of power evolution at 1070 nm and 1120 nm were conducted.

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    Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
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    Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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    Main Results:

    • A 300 W all-fiber, linearly polarized, single-mode amplifier operating at 1120 nm was demonstrated.
    • An optical efficiency of 70% was achieved, limited by pump power.
    • The amplifier utilizes 4 m of Yb-doped fiber and 20 m of germanium-doped fiber.

    Conclusions:

    • The integrated ytterbium-Raman architecture effectively scales power by transferring energy to longer wavelengths.
    • The demonstrated system shows significant potential for scaling to kilowatt power levels.
    • This approach offers a promising route for high-power, all-fiber laser sources.