UC知道物理专业英语翻译
来源：百度知道 编辑：UC知道 时间：2024/07/03 12:31:30
For laser oscillation to occur, the laser gain---the increase in the intensity of the light as it passes through the laser medium---must exceed the loss of beam intensity caused by imperfections in the mirrors and other factors. This requirement is known as the laser threshold condition. Conventional lasers must have a medium containing huge numbers of atoms or molecules to provide enough gain to exceed the loss. For example, a helium-neon laser emitting one milliwatt of power contains several thousand trillion neon atoms and about l0 times as many helium atoms. The light amplification reaches equilibrium when about one billion photons are bouncing between the resonator mirrors. In other words, several million neon atoms and tens of millions of helium atoms are needed to maintain each photon in the resonator.
There are several ways to reduce the number of atoms required. One can limit the loss of beam intensity by improving the reflectivity of the mirrors, so that the photons are
There are several ways to reduce the number of atoms required. One can limit the loss of beam intensity by improving the reflectivity of the mirrors, so that the photons are
google的翻译，可参考，
激光振荡发生，激光增益---增加强度的光穿过激光介质---必须超过损失束流强度不完善所造成的反射镜及其他因素。这一规定被称为激光阈值条件。常规激光器必须含有大量的原子或分子提供足够的增益超过损失。例如，氦氖激光发射1毫瓦的功率包含几千万亿氖原子和大约10倍之多氦原子。根据扩增达到平衡时，约10亿光子是弹跳之间的谐振镜子。换句话说，几百万氖原子和数以千万计的氦原子，需要保持每个光子在谐振。
有几种方法，以减少所需的原子。一个可以限制损失的束流强度的提高反射率的反射镜，使光子被存放更长的谐振，可以建立更容易。在某些情况下，可以提高激光增益通过减少一些背景原子干涉光放大的碰撞积极原子。但在实践中，即使是最有效的常规激光器至少需要10万原子每光子储存在谐振。显然，传统的激光不能产生束只有一个原子。