公开(公告)号：US20050169326A1

公开(公告)日：2005-08-04

申请号：US11045737

申请日：2005-01-28

Applicant: James Jacob ,  Andrew Merriam

Inventor： James Jacob ,  Andrew Merriam

IPC: H01S3/00 ,  H01S3/067 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/108 ,  H01S3/109 ,  H01S3/16 ,  H01S3/23

CPC classification number: H01S3/2391 ,  H01S3/0085 ,  H01S3/0092 ,  H01S3/067 ,  H01S3/06712 ,  H01S3/06754 ,  H01S3/0941 ,  H01S3/108 ,  H01S3/109 ,  H01S3/1611 ,  H01S3/1618

Abstract: Several methods are disclosed for the generation of coherent short-wavelength electromagnetic radiation through optical nonlinear frequency mixing means. The invention involves several stages of efficient nonlinear frequency conversion to shift the output of high-power infra-red fiber-lasers into the vacuum ultraviolet (VUV). The described laser source architecture is designed around non-critically phase-matched (NCPM) sum-frequency mixing (SFM) interactions in the nonlinear crystal CLBO. The NCPM interaction is an optimum condition for bulk frequency conversion of cw radiation because it allows tight focusing of the input laser radiation without Poynting vector walk-off, thereby increasing the non-linear drive significantly. The sub-200-nm output wave is generated from SFM of a long-wave IR laser field and a short-wave UV laser field. The long-wave laser beam may be derived directly from a rare-earth-doped fiber laser, whereas the short-wavelength UV beam is provided as the fourth frequency harmonic of a second rare-earth-doped fiber laser system.

Abstract translation: 公开了通过光学非线性频率混合装置产生相干短波长电磁辐射的几种方法。 本发明涉及高效非线性频率转换的几个阶段，以将大功率红外光纤激光器的输出转换成真空紫外线（VUV）。 所描述的激光源架构设计在非线性晶体CLBO中的非临界相位匹配（NCPM）和频混频（SFM）相互作用。 NCPM相互作用是cw辐射的体积频率转换的最佳条件，因为它允许输入激光辐射的紧密聚焦，而没有坡印廷矢量离散，从而显着增加非线性驱动。 亚200nm输出波由长波红外激光场和短波紫外激光场的SFM产生。 长波激光束可以直接从稀土掺杂的光纤激光器得到，而短波长的紫外光束则作为第二稀土掺杂光纤激光器系统的第四频率谐波。

公开(公告)号：US06249537B1

公开(公告)日：2001-06-19

申请号：US09304434

申请日：1999-05-03

Applicant: Andrew Merriam ,  Guang-Yu Yin

Inventor： Andrew Merriam ,  Guang-Yu Yin

IPC: H01S308

CPC classification number: H01S3/0826

Abstract: A self-seeding laser comprises a slave oscillator cavity coupled to a Littman cavity that operates in a single longitudinal mode. The slave oscillator cavity comprises the following elements positioned in sequential order to provide a first beam path: an end mirror, a gain medium, a grating having a groove spacing, and an output mirror. The first beam path has an angle of incidence upon the grating, and light traveling along the first beam path is zeroth-order diffracted by the grating. A tuning mirror faces the grating, for reflecting light diffracted away from the first beam path by the grating. The tuning mirror establishes the Littman cavity. The gain medium is pumped by a pulsed pump beam. The pump beam activates a pump region within the gain medium, the pump region having a radius. The Littman cavity operates in the single longitudinal mode because the angle of incidence, the groove spacing, and the radius are adjusted so that an adjacent mode walk-off time of the Littman cavity is less than a mode build-up time of the Littman cavity. A gain in the Littman cavity is initially greater than a gain in the slave oscillator cavity; the laser is thereby self-seeded in the single longitudinal mode.

Abstract translation: 自种子激光器包括耦合到在单个纵向模式下操作的Littman腔的从属振荡器腔。 从振荡器腔包括以下顺序的元件，以提供第一光束路径：端镜，增益介质，具有凹槽间隔的光栅和输出镜。 第一光束路径具有入射到光栅的角度，并且沿着第一光束路径行进的光被光栅衍射为零级。 调谐镜面对光栅，用于反射由光栅从第一光束路径衍射的光。 调音镜建立了Littman腔。 增益介质由脉冲泵浦泵浦。 泵浦光束激活增益介质内的泵浦区域，泵浦区域具有半径。 Littman腔在单纵向模式下工作，因为入射角，凹槽间距和半径被调整，使得Littman腔的相邻​​模式离开时间小于Littman腔的模式建立时间 。 Littman腔中的增益最初大于从振荡器腔中的增益; 因此激光器在单一纵向模式下自接种。