The master equation of a three-level atomic system interacting with a two-mode field at two-photon resonance is given. The two-photon gain coefficient formula is deduced.
给出了阶梯型三能级原子系统在相等偏调情况下的运动主方程，得到了双光子增益系数公式。
Analyzing the carrier density and photon density of VCL in active region, the physical mechanism of gain clamping was revealed.
分析有源区内载流子和VCL光子密度的变化，揭示了增益钳制的物理机理。
Using rate equation theory, the equation group including the population inversion density of the gain medium, photon density and the absorber ground state population density is acquired.
利用速率方程理论，得到包含激光增益介质反转密度、光子密度和饱和吸收介质基态布居数密度的速率方程组。
The multiple elastic scattering of photon can effectively enhance the gain length.
光子和散射颗粒的多次弹性散射可以增大有效增益长度。
This detector is a kind of photon counting imaging detectors, which has some properties such as high gain, small distortion and high resolution.
该探测器属于光子计数成像探测器，具有增益高、图像畸变小、分辨率高等优点。
To avoid the phenomena of photon overlap, many measures such as neutral optical attenuator, gate witch and reducing the gain of PMT, are taken to enhance accuracy of ozone measurements.
为避免产生光子并合现象的产生，可以利用在接收光路上加装中性衰减片、提高光电倍增管开始工作的高度和降低光电倍增管增益等措施来分段测量，提高臭氧测量的精度。
Our results show that the laser gain comes from two basic processes, i. e., a two-photon process and a two-step process.
本文的结果表明，激光增益来源于两个基本过程：两个光子过程和两步过程。
This is because a photon takes an increasingly long time to escape from the pull of the black hole to allow the distant observer to gain information on the object's fate.
这是因为一个光子获得了长时间来逃逸黑洞引力，就使得远距离观察者获得物体命运的资讯。
The weak-signal gain of laser comes from two elementary processes:two-photon process and two-step process.
并指出，激光的弱讯号增益来源于两个基本过程：两个光子过程和两步过程。
The weak-signal gain of laser comes from two elementary processes:two-photon process and two-step process.
并指出，激光的弱讯号增益来源于两个基本过程：两个光子过程和两步过程。
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