A laser differs from other sources of light in that it emits light that is coherent. Spatial coherence allows a laser to be focused to a tight spot, enabling uses such as optical communication, [6] …

Dec 25, 2025 · Laser, a device that stimulates atoms or molecules to emit light at particular wavelengths and amplifies that light, typically producing a very narrow beam of radiation. The …

1957年：Townes的博士生Gordon Gould创造了“laser”这个单词，从理论上指出可以用光激发原子，产生一束相干光束，之后人们为其申请了专利，相关法律纠纷维持了近30年。

Nov 28, 2024 · An easy-to-understand explanation of how lasers work, with a simple diagram showing what's inside a laser.

The most powerful laser designed to date can be found at the European Extreme Light Infrastructure facility in Romania. Its lasers are some of the most intense in the world, …

Dec 11, 2024 · What is a Laser? A laser is an intense light source that is coherent, directional, and monochromatic. This means that the phases of the light waves are aligned, the waves …

激光 （英語： laser，新加坡称 镭射，香港称 激光/雷射，台湾称 雷射）是 英文 “ 受激辐射 产生的 光放大 ”（Light Amplification by Stimulated Emission of Radiation）的 缩写，指透过刺激 原 …

Jan 6, 2026 · A laser is an intense beam of light. In surgery, lasers can be used to create heat energy or to cut or sculpt. Ophthalmologists use lasers to treat certain eye problems, including …

Dec 25, 2025 · A laser uses a pair of mirrors facing each other—an optical resonator—to build up the light energy in the beam. As light bounces back and forth between the mirrors, it passes …

Dec 25, 2025 · The combination of laser medium and resonant cavity forms what often is called simply a laser but technically is a laser oscillator. Oscillation determines many laser properties, …