Miniaturized fiber raster scanner for endoscopy

David R. Rivera; Demirhan Kobat; Chris Xu

doi:10.1117/12.874176

16 February 2011 Miniaturized fiber raster scanner for endoscopy

David R. Rivera, Demirhan Kobat, Chris Xu

Proceedings Volume 7895, Optical Biopsy IX; 78950X (2011) https://doi.org/10.1117/12.874176
Event: SPIE BiOS, 2011, San Francisco, California, United States

Abstract

A miniaturized scanning mechanism is a crucial component in the creation of endoscopes for microscopic imaging. Several groups have developed resonant scanners (e.g., spiral or Lissajous scan pattern), but these suffer from limitations in non-uniform spatial coverage and sampling time, in comparison to a raster scanner. Additionally, a resonant scanner lacks the ability to perform line-scan imaging, a crucial capability in measuring a variety of fast, dynamic physiological phenomena (e.g., blood flow, molecular diffusion, etc.). However, current miniaturized raster scanners are limited in terms of their physical dimensions and scan speed. We demonstrate a novel hybrid resonant/non-resonant miniaturized raster scanner, fabricated by mounting a double clad fiber onto two perpendicularly oriented piezo bimorphs. The fiber scanner has a total length of 2.6cm, a width/thickness [less than or equal to] 1mm, achieves [greater than or equal to] fiber tip deflection for both the resonant and non-resonant axes, and allows for imaging at approximately 4 frames per second (512 lines per frame). An essentially uniform spatial coverage and sampling time can be achieved by utilizing the middle portion (e.g., middle 500 μm) of the resonant scanning range. The small size allows for the fiber scanner to be easily packaged along with miniaturized lenses to form an endoscope for microscopic imaging. We bonded a stiffening fiber alongside the vibrating fiber to break its cylindrical symmetry. Thus, only one vibration mode is excited, generating a purely linear spatial motion. In order to demonstrate the fiber scanner's imaging capabilities we have taken transmission and fluorescence images, in which the double clad fiber's inner clad is used for fluorescence collection.

Citation Download Citation

David R. Rivera, Demirhan Kobat, and Chris Xu "Miniaturized fiber raster scanner for endoscopy", Proc. SPIE 7895, Optical Biopsy IX, 78950X (16 February 2011); https://doi.org/10.1117/12.874176

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