Calculating Photon Energy Needed to Exceed Fused Silica Glass Band Gap

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SUMMARY

The discussion centers on calculating the minimum number of photons required to exceed the band gap of fused silica glass, which is 4eV. It highlights that using 800nm light, which corresponds to a photon energy of approximately 1.55eV, necessitates the absorption of at least three photons to bridge the band gap through multiphoton absorption. The calculation involves using the formula for photon energy, E = hc/λ, and understanding the relationship between photon energy and the material's band gap. Participants confirmed the solution after initial confusion regarding the calculation process.

PREREQUISITES
  • Understanding of photon energy calculation using E = hc/λ
  • Knowledge of band gap energy in materials, specifically fused silica glass
  • Familiarity with multiphoton absorption processes
  • Basic principles of optics and light-matter interaction
NEXT STEPS
  • Research the properties of fused silica glass and its applications in optics
  • Learn about multiphoton absorption and its significance in laser-material interactions
  • Explore the calculation of photon energy for different wavelengths and materials
  • Investigate advanced photonic techniques used in high-intensity light applications
USEFUL FOR

Physicists, optical engineers, and researchers in materials science focusing on light-matter interactions and photonic applications.

vachan
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Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. This works through a process known as multiphoton absorption. In this process, several photons are absorbed at the same time. If very intense light whose photons carry 2eV of energy is shined onto a material with a band gap of 4eV, that light can be absorbed through two-photon absorption, because two photons have the right amount of energy to bridge the band gap. What is the minimum number of photons of 800nm- light that are needed to equal or exceed the band gap of fused silica glass?

I tried Energy of photon= hc/\lambda... but then after that i don't know what to do. ... i know that energy is the J/ photon... so i multiply it by the energy in the band.,... but didnt get it! anyone knows how to do it?!
 
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never mind i got it..
 

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