Understanding Impurity Doping: An Explanation

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Impurity doping refers to the intentional introduction of impurities into a semiconductor material to modify its electrical properties. This process enhances conductivity by creating additional charge carriers, either electrons or holes, depending on the type of dopant used. Common dopants include elements like phosphorus or boron, which alter the material's band structure. Understanding the specific context and application of impurity doping is crucial for a comprehensive explanation. Without this context, discussions may remain vague and uninformative.
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What is impurity doping? Can somebody please explain it?
 
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Er... doping something with impurities?

Unless you are willing to put some effort into describing the CONTEXT of your problem, you'll get the same vague, ambiguous answer.

Zz.
 
Thread 'Unexpected irregular reflection signal from a high-finesse cavity'

Thread 'Unexpected irregular reflection signal from a high-finesse cavity'

I am observing an irregular, aperiodic noise pattern in the reflection signal of a high-finesse optical cavity (finesse ≈ 20,000). The cavity is normally operated using a standard Pound–Drever–Hall (PDH) locking configuration, where an EOM provides phase modulation. The signals shown in the attached figures were recorded with the modulation turned off. Under these conditions, when scanning the laser frequency across a cavity resonance, I expected to observe a simple reflection dip. Instead...
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