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Continuous-wave tunable 8.7-microm spectroscopic source pumped by fiber-coupled communications lasers
Optics Letters
|November 3, 2009
Summary
Room temperature tunable narrow-band continuous-wave difference-frequency generation was achieved using silver gallium selenide (AgGaSe2) crystals. This method enabled high-resolution spectroscopy of sulfur dioxide (SO2).
Area of Science:
- Nonlinear optics
- Laser spectroscopy
- Materials science
Background:
- Difference-frequency generation (DFG) is a crucial nonlinear optical process for generating coherent light.
- Silver gallium selenide (AgGaSe2) is a promising nonlinear crystal for infrared applications.
- High-resolution spectroscopy requires stable, tunable, narrow-band light sources.
Purpose of the Study:
- To demonstrate tunable narrow-band continuous-wave (cw) difference-frequency generation (DFG) in AgGaSe2 at room temperature.
- To utilize the generated DFG output for high-resolution spectroscopy of sulfur dioxide (SO2).
Main Methods:
- Utilized a silver gallium selenide (AgGaSe2) crystal for DFG.
- Pumped the crystal with an Er/Yb-codoped fiber amplifier at 1.554 µm and a Nd:YAG laser at 1.319 µm.
- Achieved tunable narrow-band cw output via DFG.
Main Results:
- Demonstrated tunable narrow-band cw DFG at 8.7 µm in AgGaSe2.
- Successfully applied the DFG output for high-resolution spectroscopy of sulfur dioxide (SO2).
- Operated the DFG process at room temperature.
Conclusions:
- Room temperature operation of DFG in AgGaSe2 is feasible.
- The demonstrated DFG system is suitable for high-resolution gas spectroscopy.
- AgGaSe2 is an effective material for generating tunable mid-infrared radiation.
