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Frequency-comb-assisted broadband precision spectroscopy with cascaded diode lasers
Optics Letters
|July 2, 2016
Summary
We developed a new method using cascaded frequency agile diode lasers for broadband spectroscopy. This technique achieves a 37.4 THz measurement bandwidth with megahertz resolution, enabling advanced molecular spectroscopy and microresonator dispersion characterization.
Area of Science:
- Spectroscopy
- Optical Physics
- Laser Technology
Background:
- Frequency-comb-assisted diode laser spectroscopy combines optical frequency comb accuracy with tunable diode laser bandwidth.
- Existing methods have limitations in measurement bandwidth and scanning speed.
Purpose of the Study:
- To present a novel method for extending measurement bandwidth in spectroscopy.
- To enable high-resolution, high-speed characterization of broadband spectra.
- To facilitate the dispersion characterization of integrated microresonators.
Main Methods:
- Utilized cascaded frequency agile diode lasers.
- Achieved a measurement bandwidth of 37.4 THz (1355-1630 nm).
- Operated at megahertz resolution with scanning speeds exceeding 1 THz/s.
Main Results:
- Demonstrated a significantly extended measurement bandwidth.
- Achieved high-speed spectral characterization.
- Enabled 4th-order dispersion characterization of integrated microresonators.
Conclusions:
- The cascaded frequency agile diode laser method is a powerful tool for broadband molecular spectroscopy.
- This technique advances the characterization capabilities for integrated photonic devices, particularly microresonators.
