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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Self-Locking Screw01:16

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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
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What is a Mode?01:07

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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
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Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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    A novel Fabry-Perot (FP) cavity design enables mode-locked lasers with narrow spectral linewidths. This method generates stable nanosecond pulses, offering a promising approach for optical pulse generation.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Mode-locked lasers are crucial for various applications requiring precise temporal control of light.
    • Achieving narrow spectral linewidths in mode-locked lasers remains a challenge.
    • Fabry-Perot cavities are known for their resonant properties, but their application in mode-locking for linewidth reduction is explored here.

    Purpose of the Study:

    • To demonstrate a novel scheme for generating mode-locked laser pulses with a narrow spectral linewidth.
    • To investigate the effect of a reflected Fabry-Perot (FP) cavity on pulse characteristics.
    • To explore the potential of this method for producing nanosecond optical pulses.

    Main Methods:

    • A novel laser cavity design incorporating a reflected Fabry-Perot (FP) cavity was implemented.
    • Continuous-wave (CW) mode-locking was achieved and characterized.
    • The optical thickness of the FP cavity was systematically varied to study its impact on pulse width.
    • Output power, repetition rate, and pulse duration were measured.

    Main Results:

    • Stable continuous-wave mode-locked operation was achieved at a repetition rate of 48 MHz.
    • A maximum average output power of 2.6 W was obtained with an incident pump power of 11.9 W.
    • Pulse durations were experimentally determined to be between 0.8 and 2.6 nanoseconds (ns).
    • The reflected FP cavity was identified as the critical component for nanosecond pulse generation.

    Conclusions:

    • The demonstrated scheme effectively utilizes a reflected FP cavity to achieve mode-locked laser operation with a narrow spectral linewidth.
    • The reflected FP cavity plays a key role in generating nanosecond pulse durations.
    • This approach presents a promising method for the generation of optical pulses with narrow spectral linewidths.