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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Published on: January 28, 2019

Subfemtowatt Laser Phase Tracking.

Callum S Sambridge¹, Lyle E Roberts¹, Andrew R Wade¹

¹Centre for Gravitational Astrophysics, Australian National University, Building 38 Science Road, Acton, Australian Capital Territory 2601, Australia.

Physical Review Letters

|November 24, 2023

Summary

This summary is machine-generated.

Researchers achieved low power optical phase tracking for intersatellite laser interferometry, demonstrating continuous tracking of subfemtowatt fields. This breakthrough enables future space missions with reduced optical power requirements.

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Area of Science:

Physics
Optical Engineering
Aerospace Engineering

Background:

Low power optical phase tracking is crucial for intersatellite laser interferometry.
Minimum trackable power significantly constrains mission design for laser links between satellites.

Purpose of the Study:

To demonstrate continuous tracking of subfemtowatt optical fields.
To investigate the feasibility of interspacecraft laser links with reduced received optical power.

Main Methods:

Combined laser stabilization and control-loop parameter optimization.
Experimental demonstration of tracking subfemtowatt optical fields.
Utilized two stabilized lasers for tracking Gravity Recovery and Climate Experiment (GRACE)-like signal dynamics.

Main Results:

Demonstrated continuous tracking of a subfemtowatt optical field with a mean time between slips exceeding 1000 seconds.
Experimental performance was limited by photon shot noise and laser frequency fluctuations.
Achieved 100 minutes of continuous phase tracking of GRACE-like signals with 1-7 fW optical carrier power and zero cycle slips.

Conclusions:

The study demonstrates the feasibility of low power optical phase tracking for intersatellite laser interferometry.
Future interspacecraft laser links can operate with significantly reduced received optical power.
Advanced laser stabilization and control techniques are key to achieving high-performance optical phase tracking.