Methods, systems, and devices for multibeam coherent detection and speckle mitigation

摘要

Methods, systems, and devices are provided that may facilitate multibeam coherent detection and/or speckle mitigation. For example, some embodiments provide for multiple simultaneous independent speckle realizations in light reflected from an actively illuminated target while also may simultaneously provide reference beams inherently aligned to each speckle. These tools and techniques may facilitate coherent detection of light returned from a target. In some cases, this may provide the basis for substantial speckle mitigation. With the addition of illumination phase or frequency modulation and/or intelligent algorithmic methods, some designs may utilize the multiple speckle returns to actively mitigate speckle noise, and can further be used to separately measure speckle phase to implement interferometric resolution surface tilt measurement and/or surface imaging. These tools and techniques may be utilized for other purposes related to multibeam coherent detection and/or speckle mitigation.

主权项

1. A system for facilitating multibeam coherent detection, the system comprising:
a coherent light source; a first beam splitter that generates at least two beams from light emitted from the coherent light source; a second beam splitter that transmits a portion of the at least two beams as interrogation beams towards one or more target interrogation regions of a target to be interrogated and that redirects light counter-propagating with respect to the interrogation beams from the one or more target interrogation regions; and a third beam splitter that reflects a portion of energy from each of the at least two interrogation beams back towards the second beam splitter and transmits towards the second beam splitter the counter-propagating light with respect to the interrogation beams from the one or more target interrogation regions.