Coherent Narrow-Band Light Source for Miniature Endoscopes

Zhan Yu Chen, Ankur Gogoi, Shao Yu Lee, Yuan Tsai-Lin, Po Wei Yi, Ming Kuan Lu, Chih Cheng Hsieh, Jin Chang Ren, Stephen Marshall, Fu Jen Kao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


In this work, we report the successful implementation of a coherent narrow-band light source for miniature endoscopy applications. An RGB laser module that provides much higher luminosity than traditional incoherent white light sources is used for illumination, taking advantages of the laser light's high spatial coherence for efficient light coupling. Notably, the narrow spectral band of the laser light sources also enables spectrally resolved imaging, to distinguish certain biological tissues or components. A monochrome CMOS camera is employed to synchronize with the time lapsed RGB laser module illumination for color image acquisition and reconstruction, which provides better spatial resolution than a color CMOS camera of comparable pixel number, in addition to spectral resolving.

Original languageEnglish
Article number7100707
JournalIEEE Journal of Selected Topics in Quantum Electronics
Issue number1
StatePublished - 1 Jan 2019


  • Endoscope
  • RGB laser
  • monochrome CMOS
  • narrow-band imaging (NBI)


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