What is unusual is that this laser is the exact inverse of most pulsed lasers: it's on most of the time, but periodically turns itself off for a short time.

有所不同的是，这种激光器与其它脉冲激光器完全相反：在大多数的时间里它是打开着的，但它会周期性的短暂自动关闭。

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High frequency pulsed sounds might be used for echolocation, and low frequency time continuous signals related with communication and emotive state expression.

高频脉冲信号可能与回声定位有关，而低频连续信号可能与通信和情感表达有关。

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The time characteristics of a pulsed ti: sapphire laser have been studied theoretically based on the rate equation of four-level system.

本文从四能级结构激光速率方程出发，对脉冲掺钛蓝宝石激光器的时间特性进行了理论研究。

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