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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Published on: February 4, 2017

Coherent Two-Photon LIDAR with Incoherent Light.

Chung-Hyun Lee¹, Yosep Kim¹, Dong-Gil Im¹

¹Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.

Physical Review Letters

|December 15, 2023

Summary

This summary is machine-generated.

Coherent two-photon LIDAR overcomes range limitations of traditional LIDAR by using two-photon interference, enabling precise distance measurements even with short coherence times and in noisy conditions.

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Area of Science:

Optics and Photonics
Quantum Optics
Remote Sensing

Background:

Coherent light detection and ranging (LIDAR) uses first-order interference for precise distance measurements.
Its range is limited by the light source's coherence time, which depends on spectral bandwidth.

Purpose of the Study:

To introduce a novel coherent two-photon LIDAR scheme.
To overcome the coherence time limitation inherent in conventional coherent LIDAR systems.
To demonstrate robust distance ranging beyond the coherence time limit.

Main Methods:

Utilizing the phenomenon of two-photon interference of thermal light.
Leveraging second-order interference, which is independent of coherence time.
Combining with transverse two-photon interference for range determination without time-domain fringes.

Main Results:

Demonstrated distance ranging significantly beyond the coherence time limit.
The coherent two-photon LIDAR scheme proved robust against environmental turbulence and ambient noise.
Successfully achieved distance measurements without relying on traditional time-domain interference.

Conclusions:

Coherent two-photon LIDAR effectively eliminates range limitations imposed by coherence time.
The developed scheme offers a robust and novel approach to remote sensing.
This work highlights new applications for two-photon correlation in classical light.