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To evaluate models for efficient second-harmonic generation based on charge transport by hopping the authors have prepared fibres at 300 and 77 K. No significant differences in the evolution and conversion efficiency were observed.<<ETX>>
Seeded second harmonic generation (SHG) is compared between room temperature (RT) and liquid N/sub 2/ temperature (LNT) in GeO/sub 2/-doped silica fibres. At RT the SH power grows much more rapidly. The corresponding conversion efficiency after seeding for 2 h is over 20 times larger than at LNT.<<ETX>>
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