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Note: laser frequency shifting by using two novel triple-pass acousto-optic modulator configurations
E de Carlos-López1, J M López, S López
1División de Tiempo y Frecuencia, Centro Nacional de Metrología, El Marqués, Querétaro 76246, México. edlopez@cenam.mx
The Review of Scientific Instruments
|December 5, 2012
Summary
We designed novel triple-pass acousto-optic modulator (AOM) systems. These systems offer larger frequency shifts and can simplify laser setups for applications like atomic clocks.
Area of Science:
- Optics
- Photonics
- Acousto-Optics
Background:
- Acousto-optic modulators (AOMs) are crucial optical devices.
- Double-pass AOM configurations minimize angle dependence on modulation frequency.
- Existing systems face limitations in frequency shift and laser count for specific applications.
Purpose of the Study:
- To design novel triple-pass acousto-optic modulator systems.
- To explore configurations that enhance frequency shift capabilities.
- To investigate potential simplifications for laser systems in applications like atomic clocks.
Main Methods:
- Developed two distinct triple-pass AOM configurations.
- Utilized a retro-reflecting mirror in one design.
- Incorporated a right-angle prism in the second design for a third beam pass.
Main Results:
- The triple-pass systems achieve a frequency shift three times the AOM's central frequency.
- Diffraction efficiencies of approximately 27% and 44% were obtained with the two configurations.
- The designs extend the functionality of AOMs for advanced optical systems.
Conclusions:
- Triple-pass AOM systems offer significantly larger frequency shifts compared to double-pass systems.
- These novel designs can potentially reduce the number of lasers required in applications such as Cesium-beam frequency standards.
- The use of retro-reflecting mirrors or right-angle prisms provides viable methods for achieving triple-pass configurations with good diffraction efficiencies.
