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<http://schema.org/keywords>
"Physics,general,Physical Chemistry,Optics,Lasers,Photonics,Optical Devices,Quantum Optics,Engineering"
<https://link.springer.com/article/10.1007/s003400000425?error=cookies_not_supported&code=2a68e8ce-8ff1-42f1-9ad3-e5067ae7629c>