Cr^4＋：YAG被动调Q五激光发态吸收饱和

运用速率方程计算了Ｒ＾４＋：ＹＡＧ晶体的基态吸收，激发态吸收与入射脉冲的能量密度和强度的关系。在测量晶体透过率的实验中，发现Ｃｒ＾４＋；ＹＡＧ晶体的激发态吸收趋于饱和。理论计算与实验数据拟合给出了包括基态吸收截面，激发态吸收截面和寿命等参数。     

Cr^4＋：YAG的可饱和吸收特性与被动Q开关性能研究

运用速率方程计算了Ｃｒ＾４＋：ＹＡＧ晶体的可饱和吸收特性参数，包括初始吸收系数，饱和吸收系数，饱和光强和损耗调制度，用Ｃｒ＾４＋：ＹＡＧ对脉冲和连续Ｎｄ：ＹＡＧ激光器进行了被动调Ｑ，在脉冲Ｎｄ：ＹＡＧ激光器上得到了８ｎｓ的调Ｑ激光脉冲，在连续Ｎｄ：ＹＡＧ激光器的调Ｑ中得到了间隔和幅度抖动小于５％的输出脉冲充列。     

Cr￣(4+):YAG可饱和吸收特性测量

测量了Ｃｒ４＋ＹＡＧ材料的可饱和吸收特性，用多种数据分析方法处理了实验结果，Ｃｒ４＋ＹＡＧ的基态吸收截面σｇｓ＝１１×１０－１９ｃｍ２，激发态吸收截面σｅｓ＝１．２×１０－１９ｃｍ２。     

Cr^4＋：YAG调Q特性的理论和实验研究

从理论和实验两个方面研究Ｃｒ＾４＋：ＹＡＧ的调Ｑ特性，测量了Ｃｒ＾４＋：ＹＡＧ调ＱＮｄ＾３＋：ＹＡＧ激光器在不同条件下脉冲能量和脉冲宽度，并与理论结果进行比较，结果显示脉冲能量的理论结果与实验结果能较发地符合，脉冲工的理论结果与实验结果变化趋势大致相一致，文中还对Ｃｒ＾４＋：ＹＡＧ调ＱＮｄ＾３＋：ＹＡＧ激光器的其它实验现象给出定性解释。     

氟磷酸锶晶体Cr4+:YAG被动调Q激光特性研究

采用氙灯泵浦,实现了掺钕氟磷酸锶晶体以Ｃｒ＾４＋：ＹＡＧ作为被动调Ｑ元件的１．０５９μｍ激光运转,测量了Ｃｒ＾４＋：ＹＡＧ 同小爱过率及不同泵浦能量上激光单脉冲的输出能量、脉冲宽度、重复率,给出了Ｎｄ：Ｓ－ＦＡＰ晶体Ｃｒ＾４＋：ＹＡＧ调Ｑ工作原理的方程组,数值求解该方程组得的理论结果与实验值相符。     

Cr^4＋：YAG在对撞脉冲锁模的Nd：YAG激光器中实现被动锁模的研究

在理论上提出了Ｃｒ＾４＋：ＹＡＧ作为可饱和吸收体在Ｎｄ：ＹＡＧ激光器中实现被动锁模的可能性，运用速率方程组导出在强激光脉冲作用下Ｃｒ＾４＋：ＹＡＧ激发态吸收的恢复时间和饱和光强。实验上在带有抗共振环结构的接近于介稳腔的脉冲式Ｎｄ：ＹＡＧ激光器中用Ｃｒ＾４＋：ＹＡＧ作为可饱和吸收体实现被动锁模运转，得到能量１３．５ｍＪ、平均脉宽１８０ｐｓ的锁模脉冲序列。     

YAG晶体中Cr4+和Yb3+的光谱和荧光特性研究

报道了（Ｃｒ＾４＋,Ｙｂ＾３＋）：ＹＡＧ晶体的吸收光谱和荧光光谱特性。在室温下,（Ｃｒ＾４＋,Ｙｂ＾３＋）：ＹＡＧ晶体在９３７ｎｍ和９６８ｎｍ处存在两个吸收带,能与ＩｎＧａＡｓ激光二级管有效耦合：而且在１０３０ｎｍ处有一Ｃｒ＾４＋吸收峰,可以实现对Ｙｂ＾３＋的自调Ｑ激光输出。（Ｃｒ＾＋,Ｙｂ＾３＋）：ＹＡＧ 荧光光谱与Ｙｂ＾３＋：ＹＡＧ晶体一样,发光中心也是位于１０２９ｎｍ,但其强度比Ｙｂ＾３＋：     

Cr^4＋：YAG,Cr^4＋：Mg2SiO4近红外荧光辐射温度特性研究

测量了Ｃｒ＾４＋，ＹＡＧ、Ｃｒ＾４＋，Ｍｇ２ＳｉＯ４晶体在室温和液氮温度下的荧光光谱，吸收光谱和激发态寿命，讨论了温度变化时，两种晶体中Ｃｒ＾４＋近红外辐射积分强度变化与激光发态寿命变化的关系，得出结论：在７７Ｋ￣３００Ｋ范围内，Ｃｒ＾４＋的＾３Ｔ２能级荧光辐射截面本身受温度影响不大，Ｃｒ＾４＋辐射荧光的变化，主要是由无辐射弛豫速率随温度变化而引起的。     

Passive Q-switching of Pulsed and CW Nd: YAG Lasers with Cr~(4 ): YAG

Ｐａｓｓｉｖｅ　Ｑ－ｓｗｉｔｃｈｉｎｇ　ｏｆ　Ｐｕｌｓｅｄ　ａｎｄ　ＣＷ　Ｎｄ：ＹＡＧ　Ｌａｓｅｒｓ　ｗｉｔｈ　Ｃｒ￣（４＋）：ＹＡＧＰａｓｓｉｖｅＱ－ｓｗｉｔｃｈｉｎｇｏｆＰｕｌｓｅｄａｎｄＣＷＮｄ：ＹＡＧＬａｓｅｒｓｗｉｔｈＣｒ￣（４＋）：ＹＡＧ...     

Cr，Tm∶YAG晶体中的能量转移

通过对Ｃｒ∶ＹＡＧ、Ｔｍ∶ＹＡＧ和Ｃｒ，Ｔｍ∶ＹＡＧ晶体吸收光谱和发射光谱的比较，研究了Ｃｒ，Ｔｍ∶ＹＡＧ晶体中的能量转移过程．指出Ｃｒ３＋→Ｔｍ３＋能量转移过程中，无辐射能量转移占绝对优势．     

Cr^4＋：YAG被动调Q激光器输出特性的解析分析

在考虑Cr^4＋：YAG晶体激发态吸收的情况下，给出了Cr^4＋：YAG被动调Q的Nd：YAG激光器的速率方程组，从该速率方程组出发推导出了Nd：YAG被动调Q激光器的输出能量、脉冲宽度和效率的解析解，并分析了各参量之间的相互耦合关系。结果表明，在考虑了Cr^4＋：YAG晶体激发态吸收的情况下，理论上能够正确地反应出Cr^4＋：YAG晶体的吸收特性，对设计和优化Cr^4＋：YAG被动调Q激光器有一定的指导意义。     

Saturable Excited State Absorption of Cr~(4 ) : YAG for Q-switching Nd : YAG Laser

ＳａｔｕｒａｂｌｅＥｘｃｉｔｅｄＳｔａｔｅＡｂｓｏｒｐｔｉｏｎｏｆＣｒ４＋ＹＡＧｆｏｒＱ┐ｓｗｉｔｃｈｉｎｇＮｄＹＡＧＬａｓｅｒＷＡＮＸｉａｏｋｅＬＩＮＬｉｈｕａｎｇＯＵＹＡＮＧＢｉｎＤＩＮＧＹａｎｈｕａＸＵＪｕｎＤＥＮＧＰｅｉｚｈｅｎ（Ｓｈａｎｇ...     

Efficient and low-threshold Cr4+:YAG double-clad crystal fiber laser

A significant advancement of cw lasing in Cr4+:Y3Al5O12 (Cr4+:YAG) double-clad crystal fiber grown by the codrawing laser-heated pedestal growth technique was demonstrated at RT. The optical-to-optical slope efficiency of 33.9% is the highest, to the best of our knowledge, among all Cr4+:YAG lasers, whether they are in bulk or fiber forms. The low-threshold lasing of 78.2?mW and high efficiency are in good agreement with the simulation. The keys to the high laser efficiency are twofold: one is the improved Cr4+ emission cross section and fluorescence lifetime due to release of the strain on the distorted Cr4+ tetrahedron, which also mitigates photobleaching in Cr4+:YAG; the other is the improved core uniformity at long fiber lengths. In addition, because of the low threshold, the impact of excited state absorption of the pump light is significantly reduced. The effects of crystal-orientation, self-selected, and pump-dependent linear polarization states were also addressed.     

激光二极管抽运的被动调QNd3+:YAG微晶片激光器及其稳定性

从理论和实验两个方面研究了连续激光二极管抽运的Cr~(4+):YAG被动调QNd~(3+):YAG微晶片激光器。考虑Cr~(4+):YAG饱和吸收体激发态吸收,推导了连续抽运的被动调Q微晶片激光器的速率方程,分析了微晶片参量对调Q脉冲半峰全宽和峰值功率的影响;提出了实现稳定脉冲输出的微晶片激光器设计原则。在饱和吸收体初始透过率较低(T_0≈40％)的情况下,获得了脉冲峰值功率不稳定性小于±0.7％、脉冲宽度不稳定性小于±1.0％、峰值功率高达千瓦量级的高重复频率激光输出。     

Study of the effects of Cr ions on Yb in Cr,Yb:YAG crystal

The absorption and fluorescence spectra of Cr,Yb:YAG crystal were measured. There are two absorption bands at 940 nm and 968 nm although the absorption coefficient is lower than that of the absorption peak of Yb:YAG superimposed in Cr:YAG absorption peak. The emission peak intensity is 4 times lower than that of Yb:YAG, which may be caused by the existence of the ground state absorption of Cr⁴⁺ which quenches the Yb³⁺ emission intensity. Although the emission peak of Cr,Yb:YAG is lower than that of Yb:YAG, there is an advantage of this crystal which combines the saturable absorber and gain medium into one and can be a self-Q switching laser crystal if Cr,Yb:YAG crystal is pumped with high energy power.     

Investigation of Absorption Spectra of (Cr4+,Yb3+):YAG Crystal

The absorption spectra characters of the (Cr,Yb):YAG,Cr:YAG and Yb:YAG crystals are reported. In the absorption spectra of the (Cr,Yb): YAG crystal,there are two absorption bands at 937 nm and 968 nm respectively,which are suitable for InGaAs diode laser pumping;and there is an absorption band of Cr4+ near 1030 nm,which is suitable for passive Q switch laser output at 1.03 μm. This Cr-Yb-codoped crystal may be a potential material for compact,diode laser pumped passive Q-switched solid-state laser with efficient,high-stable.     

Investigation of Absorption Spectra of(Cr~(4 ),Yb~(3 )):YAG Crystal

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Cr4+∶YAG固体激光器效率的理论分析

对Cr4+∶YAG固体激光器的吸收效率、量子效率、储存效率和提取效率等本征效率进行了分析.Cr4+∶YAG晶体的吸收截面、发射截面、上能级寿命和激活离子浓度等对激光器的本征效率有很大的影响.提高Cr4+∶YAG晶体的光学品质和激活离子的掺杂浓度，优化泵浦源的运转波长和激光腔的设计都能显著改善Cr4+∶YAG固体激光器的本征效率.