Department of Electrical Engineering, Technion-IIT, Haifa 32000, Israel.
Phys Rev Lett. 2010 Apr 30;104(17):173901. doi: 10.1103/PhysRevLett.104.173901. Epub 2010 Apr 28.
We show that the formation of pulses in actively mode-locked lasers exhibits in certain conditions a transition of the laser mode system to a light pulse state that is similar to Bose-Einstein condensation (BEC). The study is done in the framework of statistical light-mode dynamics with a mapping between the distribution of the laser eigenmodes to the equilibrium statistical physics of noninteracting bosons in an external potential. The light-mode BEC transition occurs for a mode-locking modulation that has a power law dependence on time with an exponent smaller than 2.
我们表明，在某些条件下，主动锁模激光器中脉冲的形成表现出激光模式系统向类似于玻色-爱因斯坦凝聚（BEC）的光脉冲状态的转变。这项研究是在统计光模式动力学的框架内进行的，其中激光本征模式的分布与外部势中非相互作用玻色子的平衡统计物理之间存在映射。对于时间上呈幂律依赖且指数小于 2 的锁模调制，会发生光模式 BEC 转变。
