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Frequency doubling with a free-running long-pulse Nd:YAG laser and LBO or KTP nonlinear crystals yields conversion efficiency of up to 17.5% and 162 W peak power in the second harmonic. This efficiency is obtained for a TEM00 beam with rectangular temporal pulse shape of 50 to 400 μs. To our knowledge, this is the highest second-harmonic generation (SHG) efficiency reported for the long-pulse free-running configuration. The efficiency is limited by optical damage with much lower threshold than in the Q-switch domain. The damage is preceded by a saturation effect of the SHG efficiency. Both wavelengths (fundamental and second-harmonic) are necessary for the creation of the catastrophic damage. We present first evidence for a mechanism that involves creation of transient absorption centers by the second-harmonic radiation due to multiphoton absorption. Absorption of the fundamental wave at these centers leads to local heating and ultimately catastrophic damage.
Published in:
Quantum Electronics, IEEE Journal of
(Volume:39
,
Issue:
6
)
Date of Publication: June 2003
- Page(s):
- 733 - 740
- ISSN :
- 0018-9197
- INSPEC Accession Number:
- 7648076
- Digital Object Identifier :
- 10.1109/JQE.2003.810764
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 28 May 2003
- Issue Date :
- June 2003
- Sponsored by :
- IEEE Photonics Society
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