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Related Concept Videos

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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Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
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Thermal Strain01:19

Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Thermal Expansion01:22

Thermal Expansion

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The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
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Thermal Stress01:09

Thermal Stress

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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Optical Scatter Microscopy Based on Two-Dimensional Gabor Filters
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Ultranarrow-bandwidth filter based on a thermal EIT medium.

Gang Wang1,2, Yu-Sheng Wang1, Emily Kay Huang1

  • 1Department of Physics, National Tsing Hua University, Hsinchu, 30013, Taiwan.

Scientific Reports
|May 23, 2018
PubMed
Summary
This summary is machine-generated.

We achieved high-contrast electromagnetically-induced-transparency (EIT) spectra in 87Rb vapor, demonstrating a stable, tunable bandpass filter with high transmission and narrow linewidth for precise optical applications.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Optics

Background:

  • Electromagnetically-induced-transparency (EIT) offers unique light-matter interaction properties.
  • Achieving high-contrast EIT spectra with narrow linewidths is crucial for advanced optical applications.

Purpose of the Study:

  • To present high-contrast EIT spectra in a heated 87Rb vapor cell.
  • To demonstrate the application of this EIT profile as a stable and tunable bandpass filter.

Main Methods:

  • Utilizing a heated vapor cell with single isotope 87Rb atoms.
  • Generating and analyzing electromagnetically-induced-transparency (EIT) spectra.
  • Characterizing the spectral profile, transmission, and linewidth.

Main Results:

  • Obtained high-contrast EIT spectra with resonant transmission up to 67% and a narrow linewidth of 1.1 MHz.
  • Verified theoretical predictions against experimental data.
  • Demonstrated a bandpass filter with a tuning range >100 MHz and out-of-band blocking ≥15 dB.

Conclusions:

  • The demonstrated EIT spectra provide a robust basis for a high-precision, tunable bandpass filter.
  • The narrow-linewidth, high-contrast profile enables the generation of subnatural linewidth light fields.
  • The EIT profile's nonlinearity is beneficial for various EIT-based applications.