Abstract

We propose and demonstrate an overall non-mechanical spectrally steered laser rangefinder using the dispersion-tuned swept laser (DTSL) and a passive diffractive element. The DTSL has no mechanical moving parts, making it possible to achieve an inertial-free high wavelength sweeping speed. The inherent intensity-modulation characteristic of the DTSL allows the modulation phase-shift method to be applied, similar to that used for an amplitude-modulated continuous-wave (AMCW) rangefinder. Since the pulse repetition rate of the DTSL is chirped, standard signal processing techniques for AMCW are not applicable. In this paper, we propose a novel chirped amplitude-modulated phase-shift (CAMPS) method with a signal processing technique to obtain the phase-shift information from a chirped amplitude-modulated signal. As a proof of concept, we demonstrated the CAMPS LiDAR with an axial ranging resolution of ∼50 μm at a scanning speed of 10 kHz.

Ranging disambiguation of LiDAR using chirped amplitude-modulated phase-shift method

Zheyuan Zhang, Takuma Shirahata, Ruiyan Chen, Shinji Yamashita, and Sze Yun Set
Opt. Express 31(16) 26577-26590 (2023)

Photon-counting chirped amplitude modulation lidar using a smart premixing method

Zijing Zhang, Jianlong Zhang, Long Wu, Yong Zhang, Yuan Zhao, and Jianzhong Su
Opt. Lett. 38(21) 4389-4392 (2013)

Solid-state FMCW LiDAR with two-dimensional spectral scanning using a virtually imaged phased array

Zhi Li, Zihan Zang, Yaqi Han, Lican Wu, and H. Y. Fu
Opt. Express 29(11) 16547-16562 (2021)

Diode laser lidar wind velocity sensor using a liquid-crystal retarder for non-mechanical beam-steering

Peter John Rodrigo, Theis F. Q. Iversen, Qi Hu, and Christian Pedersen
Opt. Express 22(22) 26674-26679 (2014)

Swept Source Lidar: simultaneous FMCW ranging and nonmechanical beam steering with a wideband swept source

Masayuki Okano and Changho Chong
Opt. Express 28(16) 23898-23915 (2020)