Carrier-envelope phase shift caused by grating-based stretchers and compressors
1J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506, USA. chang@phys.ksu.edu
Applied Optics
|October 28, 2006
Summary
Mechanical vibrations and thermal motion can cause significant carrier-envelope phase shifts in optical systems. Suppressing this phase noise requires specific feedback loop configurations for stretchers and compressors in chirped pulse amplifiers.
Area of Science:
- Physics
- Optical Engineering
- Laser Technology
Background:
- Carrier-envelope phase (CEP) stability is crucial for ultrafast laser systems.
- Optical stretchers and compressors are key components in chirped pulse amplification (CPA) systems.
- Mechanical vibrations and thermal fluctuations can introduce phase noise.
Purpose of the Study:
- To analyze the impact of grating displacement on carrier-envelope phase drift in optical systems.
- To determine the necessary feedback control strategies for stabilizing CEP in CPA systems.
Main Methods:
- Theoretical analysis of phase shift due to grating displacement.
- Modeling of feedback control loops for optical stretcher and compressor stabilization.
- Utilizing f-to-2f interferometry for phase drift measurement.
Main Results:
- A grating displacement of half the grating constant induces a 2π rad phase shift.
- One feedback loop is sufficient to stabilize the compressor.
- Two feedback loops are required to stabilize the stretcher.
Conclusions:
- Feedback control is essential for mitigating CEP noise in CPA systems.
- Either the stretcher or compressor can be stabilized using an f-to-2f interferometer-based feedback loop.
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