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When focusing a laser beam into a crystal, e.g. a pump beam into a nonlinear crystal for frequency doubling, it is often advisable to focus such that the Rayleigh length is of the order of the crystal length. One could achieve even higher optical intensities in the crystal with stronger focusing, but in that case only over a shorter length because of the strong beam divergence. Similarly, for end pumping off a laser crystal and will usually not want to make the (effective) Rayleigh length substantially shorter than the crystal length.

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For beams with imperfect beam quality and a given waist radius, the Rayleigh length is effectively decreased by the so-called M2 factor. This implies that such beams have a larger beam divergence for a given beam waist radius.

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Fiber mode as such does not have a Rayleigh length; by definition, its amplitude profile does not diverge. Outside the fiber (in free space) it does diverge, and there you could calculate an effective Rayleigh length for each mode. Higher-order modes would generally have shorter values of that length. The calculation could be based on numerical beam propagation, for example.

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Georgia Olympia Brikis, Director of Physics-Informed AI Research, Siemens Gerard Andrews, Product Marketing, Robotics, NVIDIA Holger Kenn, Director of Business Strategy, AI, Data, and Emerging Technology, Microsoft Corp. Paul Thomas, Director of Machine Vision and Applied AI in Global Engineering, P&G Rashmi Misra, Chief AI Officer, Analog Devices

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NVIDIA Omniverse, Metropolis, Isaac, and cuOpt™ together offer an “AI gym” in which users can train AI agents to help robots and humans sync with their environment to navigate unpredictable or complex events in industrial spaces.

A workflow using Isaac Manipulator can generate grasp poses and robot motions, first evaluating them in Isaac Sim, and then executing them in the real world with the Intrinsic platform, and visualizing the process in Flowstate.

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The Rayleigh length (or Rayleigh range) of a laser beam is the distance from the beam waist (in the propagation direction) where the beam radius is increased by a factor of the square root of 2. For a circular beam, this means that the mode area is doubled at that point. Typically, the Rayleigh length is considered for Gaussian beams; it is determined by the Gaussian (<$1/e^2$>) beam waist radius <$w_0$> and the wavelength <$\lambda$>:

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where <$\lambda$> is the wavelength in the medium, i.e., the vacuum wavelength divided by the refractive index <$n$> of the material.

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The (effective) Rayleigh length is a convenient quantity for calculations in the context of focused laser beams. Essentially, it determines the depth of focus.

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The article on laser beams contains a paragraph titled “Limitations for the Focusing of Laser Beams”, where the effective Rayleigh length is also discussed.

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