Progress on the Starshot laser propulsion system

Area of Science:

• Aerospace Engineering
• Applied Physics
• Laser Technology

Background:

• The Breakthrough Starshot initiative proposes interstellar probes propelled by light sails.
• These nanocraft spacecraft are designed to reach nearby stars within a human lifespan.
• Propulsion relies on photon momentum transfer from a powerful ground-based laser.

Purpose of the Study:

• To identify and address key challenges in developing the laser system for Breakthrough Starshot.
• To explore early efforts and potential solutions for overcoming these technological hurdles.
• To assess the feasibility of the proposed laser technology for interstellar missions.

Main Methods:

• Analysis of requirements for a kilometer-scale, 100 GW coherent phased-array laser.
• Review of current laser technologies and potential advancements.
• Exploration of engineering and physics challenges associated with high-power laser arrays.

Main Results:

• Several major challenges for the Starshot laser system have been identified.
• Early exploratory efforts suggest potential pathways to overcome these challenges.
• No fundamental physical or economic restrictions were found that would prevent the laser's development.

Conclusions:

• The development of a 100 GW laser for Breakthrough Starshot faces significant but surmountable challenges.
• Ongoing research and technological innovation are crucial for realizing this interstellar mission.
• The proposed laser system remains a viable concept for enabling rapid interstellar travel.