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The LiDAR with Reduced-Length Linear Detector Array improves upon a prior fast-wavelength-steering, time-division-multiplexing 3D imaging system with two key advancements: laser linewidth broadening to reduce speckle noise and improve the signal-to-noise ratio, and the integration of a slow-scanning mirror with wavelength-steering technology to enable 2D swath mapping capabilities. Range and velocity are measured using the time-of-flight of short laser pulses. This highly efficient LiDAR incorporates emerging technologies, including a photonic integrated circuit seed laser, a high peak-power fiber amplifier, and a linear-mode photon-sensitive detector array. With no moving parts, the transmitter rapidly steers a single high-power laser beam across up to 2,000 resolvable footprints. Fast beam steering is achieved through an innovative high-speed wavelength-tuning technology and a single grating design that enables wavelength-to-angle dispersion while rejecting solar background for all transmitted wavelengths. To optimize receiver power and reduce data volume, sequential returns from up to 10 different tracks are time-division-multiplexed and digitized by a high-speed digitizer for surface ranging. Each track’s atmospheric return can be digitized in parallel at a lower resolution using an ultra-low-power digitizer. Originally developed by NASA for SmallSat missions, this system’s precise and accurate observation capabilities—combined with reduced costs, size, weight, and power constraints—make it applicable to a wide range of LiDAR applications. The LiDAR with Reduced-Length Linear Detector Array is currently at Technology Readiness Level (TRL) 4 (validated in a laboratory environment) and is available for patent licensing.