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Pseudo-type-II tuning behavior and mode identification in whispering gallery optical parametric oscillators
Optics Express
|July 14, 2016
Summary
Whispering gallery optical parametric oscillators (OPOs) demonstrate unique wavelength tuning behaviors, unlike conventional OPOs. This study confirms novel tuning characteristics in type-0 phase matching, offering enhanced control and functionality.
Area of Science:
- Nonlinear Optics
- Quantum Optics
- Photonics
Background:
- Conventional optical parametric oscillators (OPOs) exhibit specific wavelength tuning curves based on phase-matching types (type-0, I, II).
- Whispering gallery mode (WGM) resonators offer enhanced light-matter interaction for nonlinear optical processes.
Purpose of the Study:
- To investigate and demonstrate novel wavelength tuning behaviors in whispering gallery optical parametric oscillators (WG-OPOs).
- To explore the influence of mode number coincidence on tuning characteristics in type-0 phase-matched WG-OPOs.
- To leverage the high nonlinear-optical coefficient of lithium niobate for advanced parametric oscillation.
Main Methods:
- Theoretical prediction of wavelength tuning in WG-OPOs.
- Experimental implementation using a millimeter-sized radially-poled lithium niobate disk.
- Pumping the device at 1 μm and generating signal/idler waves between 1.7-2.6 μm.
Main Results:
- Demonstrated that WG-OPOs with type-0 phase matching can exhibit both parabolic and crossing tuning branches.
- Tuning behavior depends on whether the mode numbers of generated signal and idler waves coincide or differ.
- Experimental results show excellent agreement with theoretical predictions.
Conclusions:
- Whispering gallery OPOs offer versatile wavelength tuning, surpassing conventional OPO limitations.
- The study confirms a controlled type-II-like wavelength tuning in a type-0 phase-matched system.
- The demonstrated WG-OPO integrates high nonlinearity, tunable output, and potential for self-phase locking.
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