Abstract
Coherent optical sources in the 2–5 µm range, where room temperature laser diodes are not available, are required in fiberoptic chemical sensors, high resolution spectroscopy, and remote sensing applications. Desirable source characteristics include compactness, high efficiency, narrow spectral bandwidth, wide and continuous tuning range, and fast tunability. Sources1 based on difference frequency generation (DFG) can meet all of these requirements if near-IR laser diodes are used as the pump and signal sources. In one implementation2, 50 μw of 4.3 μm radiation was generated by mixing of Ti:Al2O3 laser and a high power laser diode in AgGaS2.
© 1995 Optical Society of America
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