| The Motivation |
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| • | Parametric
frequency conversion offers advantages |
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| over normal laser
action |
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| | Generated
output wavelength determined by energy and |
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| momentum
conservation rather than an atomic energy level |
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| structure |
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| | Level
of tuneability not available from traditional laser |
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| sources
(based on phasematching conditions) |
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| | Output
profiles generally determined by pump pulse |
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| characteristics |
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| Þ | Predetermined
and predictable spectral and temporal |
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| characteristics |
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