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LiDAR, Ranging, and Satellite Laser Ranging (SLR)

LiDAR, Ranging, and Satellite Laser Ranging (SLR)

High-Precision Distance Measurements using Time-Resolved Laser Detection

An optical technique that analyzes light emission under electrical excitation to reveal electronic properties of electroluminescent materials.
Satellite Laser Ranging station emitting green laser beam at night sky
Table of contents

Precision Distance Measurement with LiDAR

What is LiDAR?

LiDAR (Light Detection and Ranging) is a laser-based measurement technique used to determine distances by measuring the time it takes for short laser pulses to travel to a target and back. By analyzing this time-of-flight, LiDAR provides precise distance and ranging information. Laser ranging refers to the same fundamental measurement principle, while Satellite Laser Ranging (SLR) represents a specialized implementation applied to Earth–satellite distance measurements. All approaches share the same physical basis but differ in measurement scale, accuracy requirements, and application domain.

Schematic of a time-of-flight LiDAR system showing laser emission, photon detection, and timing-based distance calculation.

How does LiDAR work?

LiDAR systems emit short laser pulses toward a target and record the arrival time of reflected photons relative to the emission event. The measured time-of-flight is converted into distance using the known speed of light. Repeated measurements enable accurate ranging and, in scanning systems, spatial mapping. While laser ranging applies this principle to point-to-point distance measurements, SLR extends it to Earth–orbit distances, requiring extremely precise timing, synchronization, and time-resolved photon detection.

LiDAR Data & Analysis

LiDAR measurements generate time-stamped photon arrival data that are analyzed to extract precise distance information. Key analysis steps include time-of-flight calculation, signal filtering, and statistical averaging to improve accuracy and precision. In advanced setups, photon timing distributions enable range resolution at the millimeter or even sub-millimeter level. For SLR, data analysis incorporates long-distance corrections, such as atmospheric effects and orbital modeling, while maintaining the same fundamental time-resolved ranging workflow used in LiDAR measurements.

Why use LiDAR?

LiDAR enables non-contact, highly accurate distance measurements across a wide range of scales, from laboratory metrology to satellite ranging. Its reliance on time-resolved laser pulses allows precise and repeatable measurements, largely independent of ambient light conditions. LiDAR-based ranging is well suited for applications requiring high spatial accuracy, long measurement distances, or fast acquisition. Satellite Laser Ranging extends these benefits to geodetic and space applications, where extreme precision and long-term measurement stability are essential.

Prima – Compact 3-color picosecond laser with pulsed and CW operation for flexible excitation in time-resolved spectroscopy and microscopy.

Instrumentation requirements for LiDAR

Reliable LiDAR measurements require short-pulse laser sources, fast single-photon detectors, and precise time measurement electronics. High temporal resolution is critical for accurate time-of-flight determination, while low timing jitter directly improves distance precision. Stable synchronization and high data throughput are essential, especially for long-range or high-repetition-rate systems. For SLR applications, additional requirements include ultra-stable timing references and robust signal detection at very low photon return rates, while preserving the same core time-resolved measurement architecture.

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PicoQuant Instrumentation for LiDAR

Explore PicoQuant’s compatible components designed for DOT & DOI.

PicoQuant pulsed laser and LED sources

Laser Sources

Picosecond pulsed diode lasers provide controlled near-infrared excitation for time-resolved LiDAR measurements. Stable repetition rates and short pulse durations enable precise characterization of photon propagation in scattering tissue.

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PicoQuant's hybrid and SPAD single-photon detectors

Single-Photon Counting Detectors

Single-photon sensitive detectors record weak transmitted or fluorescent signals with high timing precision. Low timing jitter and high sensitivity are essential for accurate extraction of absorption and scattering properties.

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Overview image of PicoQuant Time Tagging and TCSPC units including HydraHarp 500, MultiHarp 150/160, PicoHarp 330, and TimeHarp 260.

Time Tagging & TCSPC Electronics

Time-Correlated Single Photon Counting (TCSPC) and time tagging electronics measure photon arrival times with picosecond resolution across multiple channels. This enables precise reconstruction of temporal point spread functions for quantitative tissue imaging.

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Application Examples

The following examples demonstrate how PicoQuant laser and TCSPC technologies enable next generation LiDAR concepts from Doppler velocimetry and underwater imaging to quantum enhanced and SWIR flash depth sensing.

Schematic of Doppler single-photon LiDAR using a pulsed laser, SPAD detector, TCSPC electronics, and galvo scanners, with resulting 3D point cloud showing per-pixel velocity information.

Doppler Single-Photon LiDAR with the Prima 3-Color Picosecond Laser

Using the Prima 3-Color stand-alone picosecond laser, Doppler single-photon LiDAR enables simultaneous distance and velocity measurement from extremely weak reflections. This breakthrough approach delivers real-time 3D imaging with per-pixel motion information, unlocking new capabilities for autonomous navigation, remote sensing, and high-speed dynamic scene analysis.

3D depth reconstructions of a submerged brass pipe connector at increasing attenuation lengths up to 7.5 AL using a single-photon LiDAR system with 532 nm pulsed laser illumination.

Real-Time Underwater 3D Imaging Using the PicoQuant VisUV Laser

A fully submerged single-photon LiDAR system achieved real-time 3D imaging in highly scattering underwater environments using the PicoQuant VisUV 532 nm pulsed laser. Time-correlated single-photon counting enabled depth reconstruction up to 7.5 attenuation lengths with GPU-based processing.

Time-resolved intensity and coincidence correlation images demonstrating entanglement-based quantum LiDAR depth extraction immune to classical light interference.

Entanglement-Based Quantum LiDAR for Interference-Resilient Depth Imaging

A quantum LiDAR system exploited spatially entangled photon pairs generated by a 355 nm pulsed pump laser to retrieve depth information immune to classical spoofing and background interference. Time-resolved coincidence detection with a SPAD camera enabled accurate distance extraction even in synchronous and asynchronous jamming scenarios.

Experimental setup for temperature-dependent SPAD timing jitter measurements using picosecond lasers and TCSPC electronics.

Temperature-Dependent SPAD Timing Jitter Characterization for LiDAR Using PicoQuant Lasers

CMOS SPAD structures were characterized from 0 °C to 60 °C using PicoQuant picosecond lasers at 405 nm, 780 nm, and 905 nm. TCSPC measurements revealed strong temperature-dependent jitter in devices with weak electric fields, while optimized field engineering significantly suppressed diffusion-induced timing tails critical for stable LiDAR distance resolution.

Outdoor flash LiDAR intensity and depth images at 3 m and 10 m distance acquired with a 1550 nm InGaAs/InP SPAD array and PicoQuant VisIR-1550-HC pulsed laser.

Room-Temperature SWIR Flash LiDAR with PicoQuant VisIR-1550-HC

A 96×96 3D-stacked InGaAs/InP SPAD array enabled room-temperature flash LiDAR at 1550 nm using the PicoQuant VisIR-1550-HC pulsed laser. With 3 ns nanosecond gating and time-sliding acquisition, the system achieved up to 100 m range and 2 cm depth resolution under strong ambient sunlight (120 klux).

Related Methods

Schematic and photograph of an underwater single-photon LiDAR system using a 532 nm pulsed laser, optical fiber delivery, SPAD detector array, and FPGA-based timing electronics.

Single-Photon LiDAR

A time-of-flight LiDAR technique that detects and time-tags individual photons to reconstruct distance from extremely weak reflections. By using SPAD detectors and TCSPC electronics, it enables long-range and photon-efficient 3D imaging in low-light or high-background environments.

Time-resolved intensity and coincidence images demonstrating entanglement-based quantum LiDAR depth extraction resilient to classical background interference.

Quantum LiDAR

An emerging LiDAR approach that exploits quantum properties of light, such as entanglement or photon correlations, to enhance resilience against background noise and spoofing. It enables interference-resistant depth measurements and improved target discrimination beyond classical detection schemes.

Scientific Insights & Resources

Latest Blog Articles

Experimental Doppler single-photon lidar setup using a Prima pulsed laser, SPAD detector, and TCSPC timing electronics with resulting 3D range and velocity reconstruction.
May 11, 2025

Turning Vision into Results with Doppler Single-Photon Lidar

Experimental setup for temperature-dependent SPAD timing jitter measurements using picosecond lasers and TCSPC electronics.
January 23, 2025

SPAD Timing Jitter Revealed by TCSPC

Experimental Doppler single-photon lidar setup using a Prima pulsed laser, SPAD detector, and TCSPC timing electronics with resulting 3D range and velocity reconstruction.
May 11, 2025

Turning Vision into Results with Doppler Single-Photon Lidar

Experimental setup for temperature-dependent SPAD timing jitter measurements using picosecond lasers and TCSPC electronics.
January 23, 2025

SPAD Timing Jitter Revealed by TCSPC

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