公开(公告)号：US06246707B1

公开(公告)日：2001-06-12

申请号：US09195477

申请日：1998-11-18

Applicant: Yusong Yin ,  Dmitry Donskoy

Inventor： Yusong Yin ,  Dmitry Donskoy

IPC: H01S310

CPC classification number: H01S3/08009 ,  H01S3/0812 ,  H01S3/094 ,  H01S3/1024

Abstract: A pulsed laser preferably a tunable laser having a narrow band width is provided which has a high conversion efficiency at a high repetition rate. The laser includes a diffraction grating located in the laser's optical cavity. The optical cavity is defined by a mirror and diffraction grating or two mirrors with a diffraction grating therebetween. A tunable laser material is located within the optical cavity between the mirror and the diffraction grating. Desirably the diffraction grating is movably mounted within the optical cavity so that a beam of a presected wave length diffracted by the grating can be directed across the laser material. Optionally where two mirrors define the optical cavity, one of the mirrors or the grating or both can be movably mounted within the optical cavity. Preferable the movable grating and the movable mirror are rotatably mounted.

Abstract translation: 提供脉冲激光器，优选具有窄带宽的可调激光器，其以高重复率具有高转换效率。 激光器包括位于激光器光腔中的衍射光栅。 光学腔由反射镜和衍射光栅或其间具有衍射光栅的两个反射镜限定。 可调激光材料位于反射镜和衍射光栅之间的光学腔内。 理想地，衍射光栅可移动地安装在光腔内，使得由光栅衍射的被预测波长的光束可以被引导穿过激光材料。 可选地，两个反射镜限定光腔，反射镜之一或光栅或两者可移动地安装在光腔内。 优选可移动光栅和可移动镜可旋转地安装。

公开(公告)号：US06061370A

公开(公告)日：2000-05-09

申请号：US277394

申请日：1999-03-26

Applicant: Yusong Yin

Inventor： Yusong Yin

IPC: H01S3/109 ,  H05K3/00 ,  H01S3/10

CPC classification number: H01S3/109 ,  H05K3/0026

Abstract: A fourth harmonic frequency generating method and apparatus is provided. The system includes within the optical cavity an active laser medium, a second harmonic generator for generating second harmonic frequency of the fundamental frequency emitted by the laser. The fundamental beam is directed to a second harmonic generation crystal where a portion of the fundamental beam is converted to a second harmonic beam. Both the second harmonic and unconverted fundamental beams are directed back across the second harmonic generator by reflective surfaces for a second pass prior to any conversion of second harmonic beam to a higher harmonic beam. Preferably the second harmonic and fundamental beams are reflected by one of the laser cavity reflective surfaces for the second pass. Optionally, there can be separate reflective surfaces to reflect each of the fundamental and second harmonic beams. A third harmonic generator for generating third harmonic frequency of the fundamental frequency, a fourth harmonic generator for generating a fourth harmonic frequency of the fundamental frequency and a wavelength selective coupling to facilitate the removal of the fourth harmonic beam from the optical cavity are provided in optical communication with the reflected second harmonic and fundamental beam. Optionally the unconverted second harmonic beam can be directed through the laser medium as additional pumping. Optionally substantially all UV beams are removed from the laser cavity preferably 99% or greater. The resulting laser has improved conversion efficiency and an improved mode quality.

Abstract translation: 提供了一种第四谐波频率产生方法和装置。 该系统在光腔内包括有源激光介质，二次谐波发生器，用于产生由激光器发射的基频的二次谐波频率。 基波束被引导到二次谐波产生晶体，其中基波束的一部分被转换成二次谐波波束。 在将二次谐波束转换成高次谐波束之前，二次谐波和未转换的基波束都通过反射表面引导回第二遍。 优选地，二次谐波和基波束被用于第二遍的激光腔反射表面之一反射。 可选地，可以有单独的反射表面以反射每个基波和二次谐波。 用于产生基频的三次谐波频率的三次谐波发生器，用于产生基频的第四谐波频率的四次谐波发生器和有助于从光腔移除四次谐波的波长选择耦合的光电二极管 与反射的二次谐波和基波束的通信。 可选地，未转换的二次谐波束可以作为额外的泵送被引导通过激光介质。 可选地，基本上所有UV光束优选地从激光腔去除99％以上。 所得到的激光器具有改进的转换效率和改进的模式质量。