公开(公告)号：US07606273B2

公开(公告)日：2009-10-20

申请号：US11872642

申请日：2007-10-15

申请人： Sheng-Bai Zhu ,  Ningyi Luo ,  Jing Yu

发明人： Sheng-Bai Zhu ,  Ningyi Luo ,  Jing Yu

IPC分类号： H01S3/30 ,  H01S3/04 ,  H01S3/00

CPC分类号： H01S3/1312 ,  H01S3/067 ,  H01S3/0941 ,  H01S3/1305 ,  H01S5/0652

摘要： An efficient and low-noise solid-state laser is optically pumped by one or more laser diode(s) driven by RF modulated current. The solid-state laser operation is stabilized by the pump source stable in both spectrum and intensity, in conjunction with automatic power control wherein the feedback loop accurately reflects the true drift in the output power. Moreover, the pump efficiency is optimized and the optical noise is minimized by adjusting the diode operation temperature such that the pump wavelength coincides with the absorption peak of the gain medium. By internally or externally modulating the amplitude of the drive current, the pump diode(s) operate in pulsed mode with controllable shape, width, repetition rate, and pulse-to-pulse intervals, which enables essentially constant optical energy produced from each pulse of the solid-state laser in high repetition rates with variable pulse-to-pulse intervals.

摘要翻译： 由RF调制电流驱动的一个或多个激光二极管光泵浦有效和低噪声的固态激光器。 固态激光器的操作通过泵浦源稳定在光谱和强度两个方面，结合自动功率控制，其中反馈回路准确反映输出功率的真实漂移。 此外，通过调节二极管工作温度使得泵浦波长与增益介质的吸收峰值一致，从而优化泵效率并使光学噪声最小化。 通过内部或外部调制驱动电流的幅度，泵浦二极管以脉冲模式运行，具有可控的形状，宽度，重复率和脉冲间隔，这使得基本上恒定的光能从每个脉冲 具有可变脉冲间隔的高重复率的固态激光器。

公开(公告)号：US07535938B2

公开(公告)日：2009-05-19

申请号：US11464424

申请日：2006-08-14

申请人： Ningyi Luo ,  Sheng-Bai Zhu

发明人： Ningyi Luo ,  Sheng-Bai Zhu

IPC分类号： H01S3/10

CPC分类号： H01S3/09415 ,  H01S3/0612 ,  H01S3/0627 ,  H01S3/07 ,  H01S3/08054 ,  H01S3/08086 ,  H01S3/0815 ,  H01S3/082 ,  H01S3/09408 ,  H01S3/0941 ,  H01S3/109 ,  H01S3/115 ,  H01S3/1611 ,  H01S3/1673

摘要： A method for producing low-noise laser output at wavelengths ranging from IR through visible to UV in various operation modes from a monolithic microchip laser comprises schemes of (1) generating one or two fundamental beam(s) from light source(s) selected upon the desired wavelength(s), polarization(s), and other features related to the desired laser output; (2) intracavity beam combination/separation due to the walk-off effect in one or more birefringent crystal(s) transparent to the propagating lights and highly anisotropic; (3) wavelength conversion in one or more nonlinear optical crystal(s); (4) compact and efficient pump source(s); and (5) minimization of intracavity loss/noise. One resonator cavity supports only one fundamental beam, which eliminates the green problem. The gain media can be selected from an extensive group of materials including isotropic and naturally birefringent crystals, with polarization dependent or independent laser emissions. Laser devices constructed in accordance with the inventive method are demonstrated with various configurations.

摘要翻译： 一种从单片微芯片激光器以各种操作模式从IR到可见光到UV的波长的低噪声激光输出的方法包括以下方案：（1）从根据光源选择的光源产生一个或两个基本光束， 期望的波长，极化以及与期望的激光输出有关的其它特征; （2）由于在对传播光透明的一个或多个双折射晶体中的离散效应而具有高度各向异性的腔内光束组合/分离; （3）一个或多个非线性光学晶体中的波长转换; （4）紧凑高效的泵浦源; 和（5）最小化腔内损失/噪音。 一个谐振腔仅支持一个基波束，消除了绿色问题。 增益介质可以从广泛的材料组中选择，包括各向同性和天然双折射晶体，具有偏振相关或独立的激光发射。 根据本发明方法构造的激光装置用各种配置进行演示。

公开(公告)号：US20070291810A1

公开(公告)日：2007-12-20

申请号：US11424471

申请日：2006-06-15

申请人： Ningyi Luo ,  Sheng-Bai Zhu

发明人： Ningyi Luo ,  Sheng-Bai Zhu

IPC分类号： H01S5/00

CPC分类号： H01S3/0627 ,  H01S3/0606 ,  H01S3/0621 ,  H01S3/08054 ,  H01S3/0809 ,  H01S3/09415 ,  H01S3/1083 ,  H01S3/109 ,  H01S3/1673 ,  H01S3/2383 ,  H01S3/2391 ,  H01S2301/20

摘要： A method for reducing speckle noise of a monolithic microchip laser with intracavity beam combining and sum frequency mixing is based on time averaging of uncorrelated speckle patterns generated from a large number of independent longitudinal modes and comprises schemes including selection of gain media and nonlinear optical materials to support broadband sum frequency mixing; adoption of gain-conjugated and/or chirped mirrors for flat-top spectra and/or mode phase diversification; multimode laser operation introduced by RF modulation; and multiplication of source modes in frequency mixing process featured with degeneration free and narrowed/uneven intervals. A device and an apparatus for generating low speckle noise red, green, blue lasers adaptable for color display systems are developed based on the inventive method.

摘要翻译： 一种用于减小单体微芯片激光器的腔内光束组合和和频混合的斑点噪声的方法是基于从大量独立纵向模式产生的不相关散斑图案的时间平均，并且包括包括选择增益介质和非线性光学材料的方案 支持宽频和频混频; 采用增益共轭和/或啁啾反射镜，用于平顶光谱和/或模式相位多样化; 通过RF调制引入的多模激光器操作; 频率混合过程中源模式的乘法特征为退化和变窄/不均匀间隔。 基于本发明的方法开发了用于产生适用于彩色显示系统的低散斑噪声红，绿，蓝激光器的装置和装置。

公开(公告)号：US20060245460A1

公开(公告)日：2006-11-02

申请号：US11414492

申请日：2006-04-28

申请人： Ningyi Luo ,  Sheng-Bai Zhu

发明人： Ningyi Luo ,  Sheng-Bai Zhu

IPC分类号： H01S3/11 ,  H01S3/091 ,  H01S3/10 ,  H01S3/04 ,  H01S3/093 ,  H01S3/094 ,  H01S3/08 ,  H01S3/092

CPC分类号： H01S3/025 ,  H01S3/08054 ,  H01S3/094084 ,  H01S3/0941 ,  H01S3/1083 ,  H01S3/109 ,  H01S3/1312 ,  H01S3/161 ,  H01S3/1611 ,  H01S3/1618 ,  H01S3/1653 ,  H01S3/1673

摘要： Solid-state lasers pumped by incoherent or partially coherent, monochromatic light sources such as high power VCSEL arrays. Efficient and uniform injection of pumping energy into gain medium is achieved through spectral match of the pump source with the gain medium absorption and multi-bounce reflections of unabsorbed pump light in a diffusing pump chamber. One preferred embodiment of the diffusing pump chamber is a hollow cylinder coaxially surrounding the gain medium. One or more transparent windows, slit-shaped or otherwise, for transmission of pump light are evenly distributed around the perimeter of the chamber and are parallel to the axis. Another preferred embodiment of the diffusing pump chamber is a highly reflecting compound parabolic concentrator. A 2-D VCSEL array is employed as the pump source and the gain medium is located at the focusing point of the chamber. This invention demonstrates solid-state lasers that are compact, robust, low-cost, and able to produce high power output in CW or pulse modes for practical applications. An important application of the present invention is high-power solid-state lasers featuring wavelength conversion such as optical parametric oscillation and second-harmonic generation. Another important application of the present invention is injection seeding, especially for pulse mode with high repetition rates.

摘要翻译： 由非相干或部分相干的单色光源（如大功率VCSEL阵列）泵浦的固态激光器。 通过泵浦光源与扩散泵室中未吸收的泵浦光的增益介质吸收和多反射反射的光谱匹配，可以将抽运能量高效均匀地注入增益介质。 扩散泵室的一个优选实施例是同轴地围绕增益介质的中空圆筒。 用于泵浦光传输的一个或多个透明窗口，狭缝形或其它方式均匀地分布在室的周边周围并且平行于轴线。 扩散泵室的另一优选实施例是高反射复合抛物面聚光器。 采用2-D VCSEL阵列作为泵浦源，并且增益介质位于腔室的聚焦点。 本发明示出了紧凑，稳健，低成本且能够在实际应用中以CW或脉冲模式产生高功率输出的固态激光器。 本发明的重要应用是具有诸如光参量振荡和二次谐波产生的波长转换的大功率固态激光器。 本发明的另一个重要应用是注射接种，特别是对于具有高重复率的脉冲模式。

公开(公告)号：US07468998B2

公开(公告)日：2008-12-23

申请号：US11386950

申请日：2006-03-22

申请人： Ningyi Luo ,  Sheng-Bai Zhu ,  Joshua Ji

发明人： Ningyi Luo ,  Sheng-Bai Zhu ,  Joshua Ji

IPC分类号： H01S3/00

CPC分类号： H01S5/0687 ,  H01S5/005 ,  H01S5/024 ,  H01S5/02415

摘要： A low-noise laser diode module comprises a laser diode for emitting light with a wavelength in the range from UV to IR, a drive circuit for injecting electrical current into said diode, and an automatic power control circuit for monitoring and adjusting laser output power using front-facet photodiode external to the laser assembly and a feedback loop. Said drive circuit produces injection current modulated by an RF signal with variable degrees, depending on the wavelength to be stabilized, the desired spectral bandwidths of the laser output, and/or other applications. Said RF signal can be a sine wave, a distorted sine wave, a rectified sine wave, a non-sine wave, a series of narrow pulses, or repetitive shunt. The present invention encompasses a method for producing stable, broadband, and low-coherent laser. The present invention also encompasses a method for producing stable narrowband or single longitudinal mode laser. The present invention further encompasses a compact light source applicable to DPSS lasers, fiber lasers, optical parametric oscillators, low-speckle laser display systems, and seeders, with or without nonlinear frequency conversion processes.

摘要翻译： 低噪声激光二极管模块包括用于发射波长在从UV到IR的范围的光的激光二极管，用于将电流注入到所述二极管中的驱动电路，以及用于监测和调整激光输出功率的自动功率控制电路，其使用 激光组件外部的前端光电二极管和反馈回路。 所述驱动电路根据待稳定的波长，激光输出的期望的光谱带宽和/或其他应用产生由可变度的RF信号调制的注入电流。 所述RF信号可以是正弦波，失真正弦波，整流正弦波，非正弦波，一系列窄脉冲或重复分流。 本发明包括用于产生稳定的，宽带的和低相干的激光的方法。 本发明还包括用于产生稳定的窄带或单纵模激光的方法。 本发明还包括适用于具有或不具有非线性频率转换过程的DPSS激光器，光纤激光器，光参量振荡器，低散斑激光显示系统和播种机的紧凑光源。

公开(公告)号：US07457330B2

公开(公告)日：2008-11-25

申请号：US11424471

申请日：2006-06-15

申请人： Ningyi Luo ,  Sheng-Bai Zhu

发明人： Ningyi Luo ,  Sheng-Bai Zhu

IPC分类号： H01S3/108

CPC分类号： H01S3/0627 ,  H01S3/0606 ,  H01S3/0621 ,  H01S3/08054 ,  H01S3/0809 ,  H01S3/09415 ,  H01S3/1083 ,  H01S3/109 ,  H01S3/1673 ,  H01S3/2383 ,  H01S3/2391 ,  H01S2301/20

摘要： A method for reducing speckle noise of a monolithic microchip laser with intracavity beam combining and sum frequency mixing is based on time averaging of uncorrelated speckle patterns generated from a large number of independent longitudinal modes and comprises schemes including selection of gain media and nonlinear optical materials to support broadband sum frequency mixing; adoption of gain-conjugated and/or chirped mirrors for flat-top spectra and/or mode phase diversification; multimode laser operation introduced by RF modulation; and multiplication of source modes in frequency mixing process featured with degeneration free and narrowed/uneven intervals. A device and an apparatus for generating low speckle noise red, green, blue lasers adaptable for color display systems are developed based on the inventive method.

摘要翻译： 一种用于减小单体微芯片激光器的腔内光束组合和和频混合的斑点噪声的方法基于从大量独立纵向模式产生的不相关散斑图案的时间平均，并且包括包括选择增益介质和非线性光学材料的方案， 支持宽频和频混频; 采用增益共轭和/或啁啾反射镜，用于平顶光谱和/或模式相位多样化; 通过RF调制引入的多模激光器操作; 频率混合过程中源模式的乘法特征为退化和变窄/不均匀间隔。 基于本发明的方法开发了用于产生适用于彩色显示系统的低散斑噪声红，绿，蓝激光器的装置和装置。

公开(公告)号：US20080089369A1

公开(公告)日：2008-04-17

申请号：US11549696

申请日：2006-10-16

申请人： Ningyi Luo ,  Sheng-Bai Zhu

发明人： Ningyi Luo ,  Sheng-Bai Zhu

IPC分类号： H01S3/10

CPC分类号： H01S3/10092

摘要： A method for effective injection seeding is based on continuous wavelength sweeping for matching the injected seeds with one or more longitudinal mode(s) of the slave oscillator in every pulse. This is achieved through rapidly varying laser drive current, as a result of RF modulation. Depending on the modulation parameters, the seeder may be operated in CW or quasi-CW or pulsed mode, with a narrow or broad bandwidth, for injection seeding of single longitudinal mode or multimode. The wavelength and bandwidth of the laser output can be tuned according to the needs. Injection seeding of high repetition rates is achievable. From pulse to pulse, the master-slave resonance persists though may occur at different longitudinal modes upon cavity length fluctuations. Cavity length control and phase locking schemes are consequently not required. The present invention also encompasses an injection seeding laser system, which is constructed in accordance with the inventive method, and a novel application of RF modulated laser diode to spectrum/wavelength control and to producing high power Gaussian beam with narrow pulse width in a stable, reliable, and cost-effective manner.

摘要翻译： 用于有效注射接种的方法是基于连续波长扫描，以将注入的种子与从属振荡器的每个脉冲的一个或多个纵向模式匹配。 这是通过快速变化的激光驱动电流实现的，作为RF调制的结果。 根据调制参数，播种机可以以CW或准CW或脉冲模式操作，具有窄或宽带宽，用于单纵向模式或多模式的注射播种。 可以根据需要调整激光输出的波长和带宽。 可以实现高重复率的注射播种。 从脉冲到脉冲，主从共振仍然存在，尽管在腔长度波动时可能发生在不同的纵向模式。 因此，不需要腔长度控制和相位锁定方案。 本发明还包括根据本发明方法构建的注射接种激光系统和RF调制激光二极管在频谱/波长控制中的新应用，并且在稳定的，稳定的， 可靠，经济有效的方式。

公开(公告)号：US20060209912A1

公开(公告)日：2006-09-21

申请号：US11378552

申请日：2006-03-18

申请人： Ningyi Luo ,  Sheng-Bai Zhu ,  Shaoping Lu

发明人： Ningyi Luo ,  Sheng-Bai Zhu ,  Shaoping Lu

IPC分类号： H01S3/10 ,  H01S3/11 ,  H01S3/091 ,  H01S3/094 ,  H01S3/092

CPC分类号： G02F1/3534 ,  G02F1/3544 ,  H01S3/005 ,  H01S3/0405 ,  H01S3/0602 ,  H01S3/0604 ,  H01S3/0612 ,  H01S3/0627 ,  H01S3/07 ,  H01S3/08 ,  H01S3/08054 ,  H01S3/08086 ,  H01S3/0809 ,  H01S3/0811 ,  H01S3/082 ,  H01S3/09415 ,  H01S3/108 ,  H01S3/1083 ,  H01S3/109 ,  H01S3/1611 ,  H01S3/1643 ,  H01S3/1673 ,  H01S3/2383 ,  H01S2302/00

摘要： A method for producing low-noise laser output at various wavelengths and/or in various operation modes in a monolithic microchip laser comprises schemes of generating two fundamental beams in separate cavities, precise intracavity beam combination based on the walk-off effect in birefringent crystal, and wavelength conversion in nonlinear optical crystals. The fundamental beams are produced from light sources selected upon the desired wavelengths, polarizations, and other features related to the laser output. Low-noise laser devices operated in SLM or with spectra of flat-top or desired bandwidths are constructed according to the method. High-volume fabrication is feasible. Apparatus of compact size and efficient frequency conversion is demonstrated with various configurations including those for generating low-noise 491 nm laser, as a replacement of Argon ion laser.

公开(公告)号：US07813390B2

公开(公告)日：2010-10-12

申请号：US11846681

申请日：2007-08-29

申请人： Ningyi Luo ,  Sheng-Bai Zhu

发明人： Ningyi Luo ,  Sheng-Bai Zhu

IPC分类号： H01S3/13

CPC分类号： H01S3/10092 ,  H01S3/0606 ,  H01S3/0627 ,  H01S3/0809 ,  H01S3/0816 ,  H01S3/083 ,  H01S3/09415 ,  H01S3/102 ,  H01S3/109 ,  H01S3/1115 ,  H01S3/113

摘要： An injection seeding laser system in which the seeded laser has a monolithic structure without any moving parts. The seeder emits light whose wavelength is swept in a radio frequency (RF) over a range that covers one or more longitudinal mode(s) of the seeded laser, which eliminates the need for active cavity length control and phase locking between the injected and output signals. The gain medium of the seeded laser is an active medium whose population is substantially inversed in response to an excitation, which can be electrical or optical. Time synchronization between the injected seeds and the triggering signal to the slave is generally not required. The present invention enables fiber MOPO that produces high power laser pulses in an efficient and cost-effective manner.

摘要翻译： 一种注射种子激光系统，其中种子激光器具有没有任何运动部分的整体结构。 播种机发射波长在覆盖种子激光器的一个或多个纵向模式的范围内的射频（RF）扫描的光，这消除了在注入和输出之间的主动腔长度控制和相位锁定的需要 信号。 种子激光器的增益介质是一种活性介质，其种群响应于可以是电的或光学的激发而基本上反转。 通常不需要将注入的种子与到从属设备的触发信号之间的时间同步。 本发明使得能够以有效和成本有效的方式产生高功率激光脉冲的光纤MOPO。

公开(公告)号：US07430231B2

公开(公告)日：2008-09-30

申请号：US11414492

申请日：2006-04-28

申请人： Ningyi Luo ,  Sheng-Bai Zhu

发明人： Ningyi Luo ,  Sheng-Bai Zhu

IPC分类号： H01S3/091

CPC分类号： H01S3/025 ,  H01S3/08054 ,  H01S3/094084 ,  H01S3/0941 ,  H01S3/1083 ,  H01S3/109 ,  H01S3/1312 ,  H01S3/161 ,  H01S3/1611 ,  H01S3/1618 ,  H01S3/1653 ,  H01S3/1673

摘要： Solid-state lasers pumped by incoherent or partially coherent, monochromatic light sources such as high power VCSEL arrays. Efficient and uniform injection of pumping energy into gain medium is achieved through spectral match of the pump source with the gain medium absorption and multi-bounce reflections of unabsorbed pump light in a diffusing pump chamber. One preferred embodiment of the diffusing pump chamber is a hollow cylinder coaxially surrounding the gain medium. One or more transparent windows, slit-shaped or otherwise, for transmission of pump light are evenly distributed around the perimeter of the chamber and are parallel to the axis. Another preferred embodiment of the diffusing pump chamber is a highly reflecting compound parabolic concentrator. A 2-D VCSEL array is employed as the pump source and the gain medium is located at the focusing point of the chamber. This invention demonstrates solid-state lasers that are compact, robust, low-cost, and able to produce high power output in CW or pulse modes for practical applications. An important application of the present invention is high-power solid-state lasers featuring wavelength conversion such as optical parametric oscillation and second-harmonic generation. Another important application of the present invention is injection seeding, especially for pulse mode with high repetition rates.

摘要翻译： 由非相干或部分相干的单色光源（如大功率VCSEL阵列）泵浦的固态激光器。 通过泵浦光源与扩散泵室中未吸收的泵浦光的增益介质吸收和多反射反射的光谱匹配，可以将抽运能量高效均匀地注入增益介质。 扩散泵室的一个优选实施例是同轴地围绕增益介质的中空圆筒。 用于泵浦光传输的一个或多个透明窗口，狭缝形或其它方式均匀地分布在室的周边周围并且平行于轴线。 扩散泵室的另一优选实施例是高反射复合抛物面聚光器。 采用2-D VCSEL阵列作为泵浦源，并且增益介质位于腔室的聚焦点。 本发明示出了紧凑，稳健，低成本且能够在实际应用中以CW或脉冲模式产生高功率输出的固态激光器。 本发明的重要应用是具有诸如光参量振荡和二次谐波产生的波长转换的大功率固态激光器。 本发明的另一个重要应用是注射接种，特别是对于具有高重复率的脉冲模式。