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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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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
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Related Experiment Video

Updated: Nov 12, 2025

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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Tunable fiber Fabry-Perot cavities with high passive stability.

Carlos Saavedra, Deepak Pandey, Wolfgang Alt

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    We developed stable fiber Fabry-Perot cavities (FFPCs) with piezoelectric tuning for precise optical control. These compact devices offer high mechanical stability and low frequency noise, ideal for advanced applications.

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    Area of Science:

    • Optics and Photonics
    • Mechanical Engineering
    • Materials Science

    Background:

    • High-finesse optical cavities are crucial for precision measurements and quantum technologies.
    • Existing Fabry-Perot cavities often face challenges with mechanical stability and tunability.
    • Monolithic designs offer potential improvements in stability and alignment.

    Purpose of the Study:

    • To present novel monolithic fiber Fabry-Perot cavities (FFPCs) with enhanced passive mechanical stability.
    • To demonstrate fast, wide-range frequency tuning capabilities using integrated piezoelectric elements.
    • To characterize the frequency noise and stability of these FFPCs.

    Main Methods:

    • Fabrication of three monolithic fiber Fabry-Perot cavities with mirrors fixed in slotted glass ferrules.
    • Integration of piezoelectric elements for active frequency tuning in two designs.
    • Experimental characterization of cavity resonance locking bandwidths and frequency noise spectrum.

    Main Results:

    • Achieved high passive mechanical stability, enabling sub-Hertz feedback bandwidths.
    • Demonstrated fast tuning over the entire free-spectral range.
    • Suppressed root-mean-square frequency fluctuations to ~2% of the cavity linewidth.
    • Identified thermal noise as the dominant noise source at mechanical resonances.

    Conclusions:

    • The developed FFPCs exhibit excellent mechanical stability and tunability.
    • These compact devices are suitable for diverse applications including sensing, optical filtering, and quantum interfaces.
    • The design overcomes limitations of traditional cavities, paving the way for improved optical systems.