Optimization of the pulse detection structure of the active ranging optical system

Jinsuk Hong, Jung Hwan Shin, Hae Seog Koh, Sug Whan Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution


An active range detection system with high power laser source requires a high precision of pulse timing. Although the trigger time stamp can be obtained electrically on the circuit board level, it is crucial to detect the actual transmitting laser pulse signal to monitor the malfunction of the laser. To detect the signal, inserting a reflector in the optical path is suggested so that the photodiode can detect the signal directly. To insert the reflector and pulse detection photodiode in the optical path of the transmitting laser, it is required to confirm the obscuration ratio of the laser module by the shadow of the reflector. The shape of the reflector was set to be rectangular due to the manufacturability although the elliptical reflector shows a better performance in the aspect of the vignette. As a result, it is confirmed that the obscuration is tolerable enough to cover the requirement of 0.8 of the nominal irradiances of the signal of each pixel when the reflector angle is set to be 47 ° and insertion depth is between 0.9 mm and 2 mm.

Original languageEnglish
Title of host publicationHigh-Power Lasers and Applications X
EditorsRuxin Li, Upendra N. Singh, Shibin Jiang
ISBN (Electronic)9781510630796
Publication statusPublished - 2019
EventHigh-Power Lasers and Applications X 2019 - Hangzhou, China
Duration: 2019 Oct 222019 Oct 23

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceHigh-Power Lasers and Applications X 2019

Bibliographical note

Publisher Copyright:
© 2019 SPIE.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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