Frequency Doubling

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Frequency Doubling

• Sytse Postma
• Supervision Klaus Boller
• Internship at InnoLight
• (Germany, Hannover)

ICPS 2003, Odense Denmark
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Contents presentation

• Goal
• Laser set up
• Quasi phase matching
• Single pass
• Double pass
• Resonator doubling
• Conclusion
• Recommendations

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Goal

• Doubling the frequency in single pass, double
  pass and in an external resonator.
• Conserving the good beam properties of the
  infrared light.

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Laser set up 2
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Non Linear Optics
In this work only the first non linear term is
used. The non linear polarization is then
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Quasi phase matching
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Single pass 1

• Only one times through the crystal
• The maximum conversion is

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Single pass 2

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Single pass 3
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Single pass 4
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Double pass 1

• Two times with the beam through the crystal means
  four times so much light that will be have the
  doubled frequency
• Therefore the crystals have a wedge will this
  succeed.

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Resonator
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Resonator
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Conclusions

• It is possible doubling the frequency with PPKTP
  crystals.
• 1319, 1064 and 946 nm laser light is doubled in
  resonator and single pass. Only 1064nm light is
  in double pass doubled.
• Whit PPKTP crystals is it possible to double
  light from 700-4000 nm.

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Recommendations

• Unfortunately the project is not completely
  fulfilled while many PPKTP crystals not function
  after they are coated.
• Thereby the wedge was forgotten in some crystals.