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second harmonic conversion
It is shown that, in such crystals, the maximal efficiency of fundamental-to-second harmonic conversion is low, and the dependence of the average intensity of the second harmonic on the fundamental intensity differs considerably from a square law.
      
Neglecting pump depletion, it is found that for samples of well-defined symmetry, the second harmonic conversion efficiency scales with film thickness, with no observed enhancement owing to coherence length effects.
      
We show that the double grating feedback improves the second harmonic conversion efficiency by several orders of magnitude as compared to the freely running laser.
      
In this report we examine the second harmonic conversion characteristics of a 3.8?mm thick birefringently phase matched Yb:YAB crystal which is then examined in more detail by slicing into four thinner sections each approximately 400?μm thick.
      
Very low second harmonic conversion efficiency has been observed until now.
      
 

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