Fusion Initiation with Lasers: Challenges & Opportunities

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How is fusion initiated with a laser? What are the difficulties that are preventing physicists from using it?
 
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Have you read about the National Ignition Facility (NIF) at Livermore? See
https://lasers.llnl.gov/programs/nic/icf/
The difficulties include billions of dollars, and decades of time.
 
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