The illustration of aberration correction using adaptive optics
- Adaptive Optics refers to optical systems which adapt to compensate for optical effects introduced by the medium between the object and its image.
- Adaptive Optics works by measuring the distortions in a wavefront and compensating for them with a device that corrects those errors, such as a deformable mirror or liquid-crystal spatial light modulators.
- LCoS can be used to improve the performance of optical systems by reducing the effect of wavefront distortion.
LCoS based spatial light modulators (SLMs) are versatile adaptive optical elements. For aberration correction, the required scene-based wavefront sensing can be implemented as a modified correlation-based Shack-Hartmann approach where a high-resolution SLM first senses and then corrects the aberrations. A very high wavefront correction precision can be obtained using JDC LCoS micro-display, due to its high pixel density and very small pixel pitch.
Most adaptive optics systems consist of three elements:
- The wavefront sensor which measures phase variations.
- The wavefront correction device (JDC Phase Mode LCoS micro-display).
- A control computer which must be very fast to correct for real time variations.
Adaptive Optics Applications
- Correcting the atmospheric turbulence
- Recording of high resolution retinal images
- Adaptive Optics visual simulator
- Advanced ophthalmic (eye related) optics element
- Optical Trapping
- Solar telescope
- Free space optical communication system
- Portable high power laser beam manipulation
Adaptive optics can be used to correct aberration; therefore it can be applied in astronomy telescope, high-energy-laser beam control, and vision science. The inspection of retina showing clinical features of microaneurysms, haemorrhages, hard exudates, neovascularization, maculopathy, edema represents the disease of diabetes, hypertension, and arteriosclerosis.
JDC’s LCoS micro-displays have the advantage of precisely controlled multi-level phase modulation (our unique modulation method allows at least 4096 (12bits) RMS voltage levels). In adaptive optics such control is the key in achieving better optical efficiency (low loss) and improved aberration correction.
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