Understanding Waveform & Autocorrelation in Pulse Lasers

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SUMMARY

The discussion centers on the principles of autocorrelation in pulse laser systems, specifically comparing a single wave with a wavelength of 400nm to two overlapping waves of 800nm. It is established that overlapping two 800nm waves results in destructive interference when they are half a wavelength apart, leading to no intensity rather than producing a 400nm wavelength. The confusion arises from the association of a single wavelength with laser pulses, which is clarified through the understanding of wave interference and autocorrelation techniques.

PREREQUISITES
  • Understanding of pulse laser systems
  • Knowledge of wave interference principles
  • Familiarity with autocorrelation techniques
  • Basic concepts of wavelength and frequency
NEXT STEPS
  • Research co-linear autocorrelation methods in laser applications
  • Study the principles of wave interference and its effects on laser intensity
  • Explore the characteristics of different wavelengths in laser technology
  • Learn about the applications of pulse lasers in scientific research
USEFUL FOR

Laser physicists, optical engineers, and researchers working with pulse laser systems who seek to deepen their understanding of wave properties and autocorrelation techniques.

Ted goldmund lee
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So, I was working on autocorrelation for my pulse laser system and I started to wonder what is the difference between single wave with 400nm of wavelength and two 800nm waves overlapped.
In the knowledge, I know of, is that wavelength is the length between two picks.

And when it is pulse laser, often we use co-linear autocorrelation to obtain time width of our pulse. When I do this, how accurately I overlap two beams it shows 800nm not 400nm but in my dumb head I can't help but think this should be 400nm.

I know it is not 400nm because I saw it, but I just want to know what is the main difference.
 

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If you overlap two 800 nm waves, exactly half a wavelength apart, you will get destructive interference and no intensity. You will not get a wave of wavelength 400 nm.
 
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Ted goldmund lee said:
Summary: So, I was working on autocorrelation for my pulse laser system and I started to wonder what is the difference between single wave with 400nm of wavelength and two 800nm waves overlapped.
In the knowledge, I know of, is that wavelength is the length between two picks.

I'm confused- why do you associate a single wavelength with a laser pulse?
 

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