Efficiency of non-linear optical device

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Discussion Overview

The discussion revolves around the efficiency of non-linear optical devices in converting light into higher order frequency components. Participants explore the theoretical and practical aspects of efficiency, including technological limitations and specific examples from literature.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions the maximum efficiency of non-linear optical devices, asking if 100% efficiency is achievable.
  • Another participant suggests that achieving 100% efficiency is unlikely and notes that efficiency depends on the device's construction, referencing ongoing research and techniques.
  • A third participant provides a reference to a specific study that reports an external conversion efficiency of 82% under certain conditions, indicating that high efficiency is possible but not absolute.
  • A later reply expresses satisfaction with the 82% efficiency figure, indicating it meets their needs.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the maximum efficiency achievable by non-linear optical devices, with some suggesting limitations while others highlight specific instances of high efficiency.

Contextual Notes

The discussion reflects varying assumptions about the technological capabilities of non-linear optical devices and the conditions under which high efficiencies can be achieved. Specific definitions of efficiency and the context of the devices are not fully explored.

zhanhai
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It is said that a non-linear optical device may convert light into its higher order components. So what is the highest efficiency of the conversion? Can a non-linear device convert all input light into its higher order frequency?

Thanks.
 
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As dlgoff indicated, this is more a technological question instead of a question regarding fundamental quantum physics. Rüdiger Paschotta's Encyclopedia of Laser Physics and Technology is a nice resource for such questions. From its article onSecond Harmonic Generation, I got the following reference:

Optics Letters, Vol. 19, Issue 17, pp. 1325-1327 (1994)
R. Paschotta et al.
"We describe a frequency-doubling monolithic standing-wave resonator made of MgO: LiNbO3 with dielectric mirror coatings for impedance matching near 100 mW input power and near-optimum nonlinear coupling. An external conversion efficiency of 82% has been achieved."

This indicates that the efficiency can be made close to one under certain circumstances.
 
Thank dlgoff and kith. 82% is a good enough efficiency for my question.
 

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