Intracavity adaptive optics. 3: Hsuria performance
J M Spinhirne1, D Anafi, R H Freeman
1United Technologies Research Center, Optics & Applied Technology Laboratory, P.O. Drawer 4181, West Palm Beach, Florida 33402, USA.
Applied Optics
|April 17, 2010
Summary
Adaptive optics can improve resonator performance by correcting aberrations. However, secondary maxima lock-on in the multidither servo control limits full adaptive correction in half-symmetric unstable resonators with intracavity axicons.
Area of Science:
- Optical Engineering
- Laser Physics
- Adaptive Optics
Background:
- Half-symmetric unstable resonators with intracavity axicons (HSURIA) are susceptible to aberrations.
- Aberrations can arise from misfigure or misalignment of intracavity conical optics.
Purpose of the Study:
- To investigate the efficacy of intracavity adaptive optics in improving HSURIA performance.
- To identify limitations in adaptive correction for HSURIA systems.
Main Methods:
- Experimental study using a deformable mirror for aberration correction.
- Implementation of multidither servo control for adaptive correction.
- Analysis of far-field performance and sensitivity to perturbations.
Main Results:
- Near diffraction-limited far-field performance was achieved with adequate deformable mirror spatial frequency correction.
- Secondary maxima lock-on by the multidither servo control significantly restricted adaptive correction.
- HSURIA demonstrated extreme sensitivity to perturbations (as small as λ/140) near the optic axis.
Conclusions:
- Intracavity adaptive optics can enhance HSURIA performance but face limitations.
- Perturbation sensitivity is a primary cause of secondary maxima lock-on.
- Precise deformable mirror figures are crucial for successful multidither servo control lock-on.
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