We presents a detailed studied of the linewidth of parametric light in clbo - opo caused by the linewidth of pumping beam , off axis phase matching , divergence angle of pumping , time above threshold , high gain coefficient of nlo crystal , fluctuate of cavitylength , spontaneous radiation , according to the momentum and energy conversion laws , and the sellmeier equations of the clbo , we calculated curves of the type - i and type - ii compared with the bbo ' s 根据能量动量守恒关系和clbo的色散方程，详细分析了由于泵浦光的线宽、泵浦光偏轴泵浦、泵浦光的发散角、泵浦光功率超过参量光振荡阈值一定倍数、高增益系数、有效腔长波动以及自发辐射引起的参量光线宽，并得到了与bbo晶体在类、类相位匹配下比较的理论曲线。
Spontaneous emission can be totally suppressed or strongly enhanced depending on the relative position of the resonant frequency from the edge of the photonic band gap and the photonic mode density . several novel phenomena can be obtained . the spontaneous emission displays an oscillatory behavior , classical light localization , photon - atom bound state , nonzero steady - state population and anomalously large vacuum rabi splitting . and localized mode associated with a defect site in an otherwise perfect photonic crystals , acts as a high - q micro - cavity 通过原子上能级与光子频率带隙边缘的相对位置或者光子态密度，可以抑制或增强原子的自发辐射。分析并得到了一些奇异的现象，如自发辐射的谐振子行为、光的局域、单光子?原子局域态、上能级中存在非零稳态原子布居数、类似于真空中的拉比频率分裂等。
In 1987 , a remarkable step was made by yablonovitch , who pointed out the possibility of the realization of photonic bandgaps , localized defect modes , and their applications to various optoelectronic devices , and by john who dicussed the strong localization of electromagnetic waves in disordered photonic crystals and also predicted many interesting quantum optical phenomena that can be realized in photonic crystals such as the bound state of photons and non - exponential decay of spontaneous emission 1987年yablonovitch和john开创性地提出光子晶体这一新概念， yablonovitch指出了有可能实现光子频率带隙和局域缺陷模以及许多光电技术方面的应用， john则讨论了在无序光子晶体中电磁波的强烈局域现象，并预言在光子晶体中存在许多有趣的量子光学现象，诸如光子局域态、自发辐射的非指数衰减。
Furthermore , the fiber phase - conjugator has been used in ld - pumped solid - state laser system with four - pass configuration to suppress the self - oscillating ( so ) phenomena caused by amplified spontaneous emitting ( ase ) in laser amplifier . when using 200 m fiber , the energy of so has been successfully decreased from 12mj to below the precision of energy - detector 将光纤相位共轭镜应用于四通放大结构中，有效抑制了放大级中的放大自发辐射引起的自激振荡现象，使得自激振荡输出能量从12mj降低到能量计最小精度以下。
Because power management in this thesis aims at amplified spontaneous emission noise of erbium ? oped fiber amplifier ( edfa ) , the thesis introduces the simplified stark ? split energy levels of er3 " , amplified working mechanisms of er3 * and working performance of edfa in details 因为本文所采用的功率管理主要是针对edfa掺饵光纤放大器所产生的自发辐射噪声去采取均衡措施，所以论文中详细介绍了edfa中铒离子的stark分裂的简化的能级模型、铒离子的放大工作机理及edfa的工作特性。
Such control can be realized in case where a atom interact with photonic band gap matericals when the atom is placed in photonic crystals whose density of modes is dramatically different from that of free space vacuum . it was known that control could be achieved by varying the frequency ( which leads to the changes of the relative position of the upper levels from the forbidden gap ) or by varying the photonic density of modes ( dos ) or by varying the intial atomic state 由于光子晶体具有不同于真空中的光子态密度，原子和光子带隙材料便发生相互作用，这样便可以控制原子的自发辐射。改变原子上能级与光子禁带边缘的相对位置、材料中的光子态密度或原子初态都可以控制原子的自发辐射。
