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A new mid-infrared tunable spectroscopic source based on fibre coupled difference frequency generation in bulk periodically-poled LiNbO3 for trace gas detection is reported. The source mixes the outputs of a fibre coupled external cavity diode laser and a 1083 nm seeded Yb-doped fibre amplifier. Powers up to 0.8 µW are obtained in the 3.8 – 4.3 µm range.
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Lancaster et al. (1998) studied this question.
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