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    • 2. 发明授权
    • Eyesafe laser system using transition metal-doped group II-VI
semiconductor as a passive saturable absorber Q-switch
    • 使用过渡金属掺杂组II-VI半导体作为无源可饱和吸收剂Q开关的眼睛安全激光系统
    • US5832008A
    • 1998-11-03
    • US790350
    • 1997-01-24
    • Milton BirnbaumRobert D. StultzMarly B. Camargo
    • Milton BirnbaumRobert D. StultzMarly B. Camargo
    • H01S3/113H01S3/16
    • H01S3/113H01S3/1608H01S3/164
    • An eyesafe laser system includes a Q-switch crystal formed of a semiconductor host material having noncentrosymmetric tetrahedral substitutional sites doped with transition metal ions in concentrations from about 0.001 to about 0.10 atomic percent, which functions as to be a saturable absorber of light at eyesafe wavelengths with a relatively long relaxation lifetime. Co.sup.2+ :ZnSe has been demonstrated to have advantageously high absorption cross section and advantageously high relaxation lifetime at both 1.54 .mu.m (Er:glass laser) and 1.6 .mu.m (Er:YAG laser). Other candidate host materials include other zinc chalcogenides, cadmium chalcogenides and zinc oxide. The resultant Q-switch does not require additional focusing optics inside the cavity and has a saturation fluence which is approximately one order of magnitude less than other state of the art saturable absorbers in the "eyesafe" wavelength region, thereby permitting substantially faster Q-switch bleaching, lower thermal loads, and less potential for damage than was hitherto possible.
    • 一种眼睛安全的激光系统包括由半导体主体材料形成的Q开关晶体,该半导体主体材料具有掺杂有约0.001至约0.10原子百分比浓度的过渡金属离子的非中心对称四面体取代位点,其功能是在眼睛安全波长处的可饱和吸收体 具有较长的松弛寿命。 已经证明Co2 +:ZnSe在1.54μm(Er:玻璃激光)和1.6μm(Er:YAG激光器)两者中具有有利的高吸收截面和有利的高弛豫寿命。 其他候选主体材料包括其他硫化锌,硫化镉和氧化锌。 所产生的Q开关不需要在腔内部附加的聚焦光学元件,并且具有比“眼睛”波长区域中的其它状态的可饱和吸收体大约一个数量级的饱和能量密度,从而允许基本上更快的Q开关 漂白,降低热负荷,并且损坏的可能性远低于迄今为止。
    • 7. 发明授权
    • Intra-cavity non-degenerate laguerre mode generator
    • 腔内非退化Laguerre模式发生器
    • US07675958B2
    • 2010-03-09
    • US11497824
    • 2006-08-02
    • Robert D. StultzSteven C. MatthewsBillie G. Hendry
    • Robert D. StultzSteven C. MatthewsBillie G. Hendry
    • H01S3/08
    • H01S3/08059H01S3/061H01S3/07H01S3/08045H01S3/08072H01S3/0813H01S3/083H01S3/115H01S3/1618H01S3/1643H01S2301/20H01S2301/203
    • A lasing method including the steps of providing a laser resonator; utilizing birefringence compensation in said resonator whereby said resonator is induced to operate in a Laguerre-Gaussian higher order mode; and utilizing polarized outcoupling of lasing energy at said higher order mode from said resonator. In the illustrative application, the laser resonator is a high-power, solid-state laser resonator. In the specific embodiment, the inventive method further includes the step of changing an outcoupling preference for a non-degenerate high-order Laguerre-Gaussian mode. In one embodiment, the step of changing outcoupling preference includes the step of changing an outcoupling polarization. In another embodiment, the step of changing outcoupling preference includes the step of changing an orientation of a roof edge of a prism in the laser resonator. Lower order Laguerre modes are discouraged from appearing in an output of the resonator by adding loss at the center of the rod aperture of the resonator or detuning the orientation of a first or a second quarter-wave plate. In the illustrative embodiment, the gain lifetime of the resonator is longer than an interpulse period thereof.
    • 一种激光方法,包括提供激光谐振器的步骤; 在所述谐振器中利用双折射补偿,由此所述谐振器被诱导以拉格尔 - 高斯高阶模式工作; 并且利用来自所述谐振器的所述高阶模式的激光能量的极化输出耦合。 在说明性应用中,激光谐振器是大功率固态激光谐振器。 在具体实施例中,本发明的方法还包括改变非退化高阶Laguerre-Gaussian模式的输出偏好的步骤。 在一个实施例中,改变输出耦合偏好的步骤包括改变输出耦合极化的步骤。 在另一个实施例中,改变输出耦合偏好的步骤包括改变激光谐振器中的棱镜的顶部边缘的方向的步骤。 不希望通过在谐振器的杆孔的中心处增加损耗或使第一或第二四分之一波片的取向失谐来降低低阶Laguerre模式出现在谐振器的输出中。 在说明性实施例中,谐振器的增益寿命长于其脉冲间隔。
    • 10. 发明授权
    • Single focus backward Raman laser
    • 单焦点向后拉曼激光
    • US5272717A
    • 1993-12-21
    • US822374
    • 1992-01-17
    • Robert D. Stultz
    • Robert D. Stultz
    • H01S3/30
    • H01S3/305
    • A single focus backward Raman laser that is a compact, efficient apparatus for converting light at a first wavelength provided by a pump laser to light at a Raman-shifted wavelength. The laser is comprised of a gas cell, two lenses, a feedback mirror, an optical isolator, and a dichroic mirror, and the gas cell contains a Raman gas medium. The Raman gas medium may be methane, hydrogen, or deuterium, for example. The two lenses bring the pump and Raman light to a single focus in the gas cell and also recollimate the light after it exits the cell. The optical isolator is used to prevent the backward-scattered pump light from reentering the pump laser. The dichroic mirror is used to reflect out the backward-scattered Raman light, while transmitting the pump laser light. The present laser has a much improved beam divergence and is much less sensitive to optical misalignments than conventional Raman half-resonator designs. The present laser is also less complex and is more compact than a multiple focus backward Raman laser, with substantially identical Raman conversion efficiency and beam divergence. The present laser is adapted to replace the Raman half-resonator and the multiple focus backward Raman laser in high pulse repetition rate (>1 Hz), medium-energy (.ltoreq.100 mJ, 1.54 .mu.m) eyesafe laser designs.