Researchers use laser light to form a tiny "optical pinhole" inside a nonlinear crystal, which also turns the infrared image into a visible image that a traditional silicon-based camera sensor can detect. With this setup, the researchers captured clear, wide-depth images without using any lenses, even in very low light. Credit: Kun Huang, East China Normal University Researchers have used the centuries-old idea of pinhole imaging to create a high-performance mid-infrared imaging system without l...