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Asynchronous midinfrared ultrafast optical parametric oscillator for dual-comb spectroscopy
Zhaowei Zhang1, Chenglin Gu, Jinghua Sun
1Scottish Universities Physics Alliance (SUPA), Department of Physics, School of Engineering and Physical Sciences, Heriot-Watt University, Riccarton, Edinburgh, UK. z.zhang@hw.ac.uk
Optics Letters
|August 3, 2012
Summary
Researchers generated two synchronized infrared laser pulse trains using an ultrafast optical parametric oscillator. This breakthrough enables advanced optical sampling techniques and future dual-comb spectroscopy applications.
Area of Science:
- Optics and Photonics
- Ultrafast Laser Technology
Background:
- Generating precisely controlled asynchronous laser pulses is crucial for advanced spectroscopy.
- Ultrafast optical parametric oscillators (OPOs) offer a versatile platform for generating tailored laser pulses.
Purpose of the Study:
- To develop a method for generating two independent, asynchronous broadband infrared pulse trains.
- To establish a timing signal for pulse coincidence in an asynchronous system.
Main Methods:
- Utilized an ultrafast optical parametric oscillator to produce two broadband 3.3 µm pulse trains.
- Achieved a stabilized repetition-rate difference of up to 5 kHz between the pulse trains.
- Employed non-phase-matched sum-frequency mixing for timing signal generation.
Main Results:
- Successfully generated two asynchronous, broadband 3.3 µm pulse trains with ~100 mW average power each.
- Demonstrated independent operation of the two oscillation channels.
- Established a reliable timing signal indicating pulse coincidence.
Conclusions:
- The developed system is immediately applicable to incoherent asynchronous optical sampling.
- Potential for coherent dual-frequency-comb spectroscopy with carrier-envelope-offset stabilization.
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