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1. 发明授权

US08073021B2 Methods for obtaining stabilized output beams from frequency converted light sources and frequency converted light sources utilizing the same 失效
标题翻译：用于从变频光源获得稳定的输出光束的方法和利用其的变频光源
公开(公告)号：US08073021B2
公开(公告)日：2011-12-06
申请号：US12476303
申请日：2009-06-02
申请人： Vikram Bhatia , Dragan Pikula , Madhan Mothi Raj
发明人： Vikram Bhatia , Dragan Pikula , Madhan Mothi Raj
IPC分类号： H01S3/10 , H01S3/13
CPC分类号： H01S5/0683 , G02F1/3775 , H01S5/0617 , H01S5/06256 , H01S5/0687 , H01S5/141
摘要： A method for operating a frequency converted light source includes sweeping a wavelength control signal of a semiconductor laser over an initial signal range and measuring an optical power of an output beam emitted from a wavelength conversion device coupled to the semiconductor laser. The wavelength control signal of the semiconductor laser may then be swept over at least one truncated signal range and the optical power of the resulting output beam is measured. The at least one truncated signal range may be centered on a point corresponding to a maximum power of the output beam of the sweep of the wavelength control signal over the preceding signal range. An operational signal range for the wavelength control signal is determined such that a midpoint of the operational signal range corresponds to the maximum optical power of the resulting output beam of the sweep over the preceding signal range. Closed-loop feedback control of the wavelength control signal in the operational signal range may then be initiated.
摘要翻译：一种用于操作频率转换的光源的方法包括在初始信号范围上扫描半导体激光器的波长控制信号，并测量从耦合到半导体激光器的波长转换器件发射的输出光束的光功率。然后可以将半导体激光器的波长控制信号扫过至少一个截断的信号范围，并测量所得到的输出光束的光功率。所述至少一个截断的信号范围可以在对应于在先前信号范围上的波长控制信号的扫描的输出波束的最大功率的点上居中。确定用于波长控制信号的操作信号范围，使得操作信号范围的中点对应于在先前信号范围上的扫描的结果输出光束的最大光功率。然后可以启动操作信号范围内的波长控制信号的闭环反馈控制。

2. 发明授权

US08045260B2 Optimized signal control in frequency-doubled laser sources 失效
标题翻译：在倍频激光源中优化信号控制
公开(公告)号：US08045260B2
公开(公告)日：2011-10-25
申请号：US12288639
申请日：2008-10-22
申请人： Vikram Bhatia , Jacques Gollier , Dragan Pikula , Daniel Ohen Ricketts
发明人： Vikram Bhatia , Jacques Gollier , Dragan Pikula , Daniel Ohen Ricketts
IPC分类号： H01S3/136 , H01S3/131 , H01S3/10
CPC分类号： H01S5/06256 , H01S5/0092 , H01S5/06837 , H01S5/0687 , H04N9/3129 , H04N9/3188
摘要： The present disclosure relates generally to semiconductor lasers and laser projection systems. According to one embodiment of the present disclosure, a method of operating a laser projection system is provided. According to the method, the laser projection system is utilized to display a sequence of pixelized image frames comprising an alternating sequence of relatively high intensity active projection periods ModON and relatively low intensity inactive projection periods ModOFF. A complementary control signal transitions between an active state QON during the relatively high intensity active projection periods ModON and an inactive state QOFF during the relatively low intensity inactive projection periods ModOFF. The transition of the complementary control signal from the inactive state QOFF to the active state QON is conditioned to anticipate initiation of relatively high intensity active projection periods ModON such that it is optimized upon initiation of the relatively high intensity active projection periods ModON. Additional embodiments are disclosed and claimed.
摘要翻译：本公开一般涉及半导体激光器和激光投影系统。根据本公开的一个实施例，提供了一种操作激光投影系统的方法。根据该方法，激光投影系统用于显示包括相对高强度的活动投影周期ModON和相对低强度非活动投影周期ModOFF的交替序列的像素化图像帧序列。互补控制信号在相对高强度的有效投影周期ModON期间的活动状态QON和在相对低强度的非活动投影周期ModOFF期间的无效状态QOFF之间转变。补充控制信号从无效状态QOFF到活动状态QON的转变被调节以预期开始相对高强度的有效投影周期ModON，使得在相对高强度的活动投影周期ModON的开始时被优化。公开并要求保护附加实施例。

3. 发明申请

US20100303107A1 Methods for Obtaining Stabilized Output Beams from Frequency Converted Light Sources and Frequency Converted Light Sources Utilizing the Same 失效
标题翻译：从变频光源获得稳定输出光束的方法及利用其的变频光源
公开(公告)号：US20100303107A1
公开(公告)日：2010-12-02
申请号：US12476303
申请日：2009-06-02
申请人： Vikram Bhatia , Dragan Pikula , Madhan Mothi Raj
发明人： Vikram Bhatia , Dragan Pikula , Madhan Mothi Raj
IPC分类号： H01S5/06
CPC分类号： H01S5/0683 , G02F1/3775 , H01S5/0617 , H01S5/06256 , H01S5/0687 , H01S5/141
摘要： A method for operating a frequency converted light source includes sweeping a wavelength control signal of a semiconductor laser over an initial signal range and measuring an optical power of an output beam emitted from a wavelength conversion device coupled to the semiconductor laser. The wavelength control signal of the semiconductor laser may then be swept over at least one truncated signal range and the optical power of the resulting output beam is measured. The at least one truncated signal range may be centered on a point corresponding to a maximum power of the output beam of the sweep of the wavelength control signal over the preceding signal range. An operational signal range for the wavelength control signal is determined such that a midpoint of the operational signal range corresponds to the maximum optical power of the resulting output beam of the sweep over the preceding signal range. Closed-loop feedback control of the wavelength control signal in the operational signal range may then be initiated.
摘要翻译：一种用于操作频率转换的光源的方法包括在初始信号范围上扫描半导体激光器的波长控制信号，并测量从耦合到半导体激光器的波长转换器件发射的输出光束的光功率。然后可以将半导体激光器的波长控制信号扫过至少一个截断的信号范围，并测量所得到的输出光束的光功率。所述至少一个截断的信号范围可以在对应于在先前信号范围上的波长控制信号的扫描的输出波束的最大功率的点上居中。确定用于波长控制信号的操作信号范围，使得操作信号范围的中点对应于在先前信号范围上的扫描的结果输出光束的最大光功率。然后可以启动操作信号范围内的波长控制信号的闭环反馈控制。

4. 发明申请

US20100118306A1 Alignment Optimization For Optical Packages 有权
标题翻译：光学封装的对准优化
公开(公告)号：US20100118306A1
公开(公告)日：2010-05-13
申请号：US12267777
申请日：2008-11-10
申请人： Vikram Bhatia , Steven Joseph Gregorski , Fumio Nagai , Yukihiro Ozeki
发明人： Vikram Bhatia , Steven Joseph Gregorski , Fumio Nagai , Yukihiro Ozeki
IPC分类号： G01B11/00 , H01L21/66
CPC分类号： G02B6/4204 , G02B6/4225 , G02B6/4227 , G02F1/3775 , H01S5/0092
摘要： Methods of optimizing optical alignment in an optical package are provided. In one embodiment, the optical package includes a laser diode, a wavelength conversion device, coupling optics positioned along an optical path extending from the laser diode to the wavelength conversion device, and one or more adaptive actuators. The method involves adjusting the optical alignment of the wavelength conversion device in a non-adaptive degree of freedom by referring to a thermally-dependent output intensity profile of the laser diode and a thermally-dependent coupling efficiency profile of the optical package. The adjustment in the non-adaptive degree of freedom is quantified such that, over a given operating temperature range of the optical package, portions of the coupling efficiency profile characterized by relatively low coupling efficiency offset portions of the output intensity profile characterized by relatively high laser output intensity and portions of the coupling efficiency profile characterized by relatively high coupling efficiency offset portions of the output intensity profile characterized by relatively low laser output intensity. Additional embodiments are disclosed and claimed.
摘要翻译：提供了优化光学封装中的光学对准的方法。在一个实施例中，光学封装包括激光二极管，波长转换装置，沿着从激光二极管延伸到波长转换装置的光路定位的耦合光学器件，以及一个或多个自适应致动器。该方法包括通过参考激光二极管的热依赖输出强度分布和光学封装的热依赖耦合效率分布来调整波长转换器件在非自适应自由度中的光学对准。量化非自适应自由度的调节，使得在光学封装的给定工作温度范围内，耦合效率分布的部分以相对较低的耦合效率为特征，输出强度分布的偏移部分表现为相对较高的激光输出强度和耦合效率分布的部分以由输出强度分布相对较高的耦合效率偏移部分表征，其特征在于相对低的激光输出强度。公开并要求保护附加实施例。

5. 发明申请

US20080089373A1 WAVELENGTH CONTROL IN SEMICONDUCTOR LASERS 有权
标题翻译：半导体激光器的波长控制
公开(公告)号：US20080089373A1
公开(公告)日：2008-04-17
申请号：US11549856
申请日：2006-10-16
申请人： Vikram Bhatia , Jacques Gollier , Martin Hai Hu , David August Sniezek Loeber , Daniel Ohen Ricketts , Chung-En Zah
发明人： Vikram Bhatia , Jacques Gollier , Martin Hai Hu , David August Sniezek Loeber , Daniel Ohen Ricketts , Chung-En Zah
IPC分类号： H01S3/00
CPC分类号： H04N9/3129
摘要： The present invention relates generally to semiconductor lasers and laser scanning systems and, more particularly, to schemes for controlling wavelength in semiconductor lasers. According to one embodiment of the present invention, a method of minimizing laser wavelength variations in a semiconductor laser is provided. According to the method, one or more of the laser drive currents is configured to comprise a drive portion and a wavelength recovery portion. The wavelength recovery portion of the drive current comprises a recovery amplitude IR that is distinct from the drive amplitude ID and a recovery duration tR that is less than the drive duration tD. The recovery amplitude IR and duration tR are sufficient to recover carrier density distribution distorted by gain compression effects prior to recovery. Additional embodiments are disclosed and claimed.
摘要翻译：本发明一般涉及半导体激光器和激光扫描系统，更具体地，涉及用于控制半导体激光器中的波长的方案。根据本发明的一个实施例，提供了一种使半导体激光器中的激光波长变化最小化的方法。根据该方法，一个或多个激光驱动电流被配置为包括驱动部分和波长恢复部分。驱动电流的波长恢复部分包括不同于驱动振幅I SUB和恢复持续时间t R的恢复幅度I SUB，这小于驱动持续时间t D D。恢复振幅I R和持续时间t R N足以恢复在恢复之前由增益压缩效应失真的载流子密度分布。公开并要求保护附加实施例。

6. 发明授权

US06545798B2 Thermal ripple-compensating, gain-flattening filter for an optical amplifier 有权
标题翻译：光学放大器的热纹波补偿，增益平坦化滤波器
公开(公告)号：US06545798B2
公开(公告)日：2003-04-08
申请号：US09829590
申请日：2001-04-09
申请人： Glenn D. Bartolini , Vikram Bhatia , Peter G. Wigley
发明人： Glenn D. Bartolini , Vikram Bhatia , Peter G. Wigley
IPC分类号： H04B1012
CPC分类号： H01S3/06758 , H01S3/302 , H01S2301/04
摘要： An optical device including an optical amplifier to amplify optical signals received through an optical input, and to supply the amplified optical signals from an optical output, and an optical filter component to compensate for variations in the gain spectrum of the optical amplifier that occur as a function of wavelength and operating temperature. The optical filter component includes a first optical filter having an athermalized transmission spectrum and a second optical filter having a transmission (or insertion loss) spectrum that varies as a function of operating temperature.
摘要翻译：一种光学装置，包括：光放大器，用于放大通过光输入接收的光信号;以及提供来自光输出的放大的光信号;以及光滤波器部件，以补偿光放大器的增益谱的变化，波长和工作温度的功能。滤光器部件包括具有非热化透射光谱的第一滤光器和具有作为工作温度的函数而变化的透射（或插入损耗）光谱的第二滤光器。

7. 发明授权

US08913241B2 Hyperspectral imaging system and method for imaging a remote object 有权
标题翻译：高光谱成像系统和远程物体成像方法
公开(公告)号：US08913241B2
公开(公告)日：2014-12-16
申请号：US13555428
申请日：2012-07-23
申请人： Vikram Bhatia , Carl Edgar Crossland , Paul G Dewa , Michael Lucien Genier
发明人： Vikram Bhatia , Carl Edgar Crossland , Paul G Dewa , Michael Lucien Genier
IPC分类号： G01J3/28
CPC分类号： G01J3/021 , G01J3/0294 , G01J3/04 , G01J3/08 , G01J3/2823 , G01J3/36
摘要： A hyperspectral imaging system and method are described herein for providing a hyperspectral image of an area of a remote object (e.g., scene of interest). The hyperspectral imaging system includes at least one optic, a scannable slit mechanism, a spectrometer, a two-dimensional image sensor, and a controller. The scannable slit mechanism can be a micro-electromechanical system spatial light modulator (MEMS SLM), a diffractive Micro-Opto-Electro-Mechanical Systems (MOEMS) spatial light modulator (SLM), a digital light processing (DLP) system, a liquid crystal display, a rotating drum with at least one slit formed therein, or a rotating disk with at least one slit formed therein.
摘要翻译：本文描述了一种用于提供远程对象（例如，感兴趣的场景）的区域的高光谱图像的高光谱成像系统和方法。高光谱成像系统包括至少一个光学元件，可扫描狭缝机构，光谱仪，二维图像传感器和控制器。可扫描狭缝机构可以是微机电系统空间光调制器（MEMS SLM），衍射微光电机械系统（MOEMS）空间光调制器（SLM），数字光处理（DLP）系统，液体晶体显示器，其中形成有至少一个狭缝的旋转滚筒或其中形成有至少一个狭缝的旋转盘。

8. 发明申请

US20090032713A1 Controlled misalignment in wavelength-converted laser sources 失效
公开(公告)号：US20090032713A1
公开(公告)日：2009-02-05
申请号：US11888461
申请日：2007-08-01
申请人： Vikram Bhatia
发明人： Vikram Bhatia
IPC分类号： G01T1/20
CPC分类号： G02F1/3501 , G02B6/422 , G02F1/37 , G02F2001/3503 , H04N9/3129
摘要： Methods of controlling semiconductor lasers are provided where the semiconductor laser generates an output beam that is directed towards the input face of a wavelength conversion device. Particular aspects of the present invention relate to alignment and/or intentional misalignment of a beam spot of an output beam on an input face of a wavelength conversion device. Additional embodiments are disclosed and claimed.

9. 发明授权

US07483458B2 Wavelength control in semiconductor lasers 有权
标题翻译：半导体激光器中的波长控制
公开(公告)号：US07483458B2
公开(公告)日：2009-01-27
申请号：US11549856
申请日：2006-10-16
申请人： Vikram Bhatia , Jacques Gollier , Martin H. Hu , David A. Loeber , Daniel Ohen Ricketts , Chung-En Zah
发明人： Vikram Bhatia , Jacques Gollier , Martin H. Hu , David A. Loeber , Daniel Ohen Ricketts , Chung-En Zah
IPC分类号： H01S3/00
CPC分类号： H04N9/3129
摘要： The present invention relates generally to semiconductor lasers and laser scanning systems and, more particularly, to schemes for controlling wavelength in semiconductor lasers. According to one embodiment of the present invention, a method of minimizing laser wavelength variations in a semiconductor laser is provided. According to the method, one or more of the laser drive currents is configured to comprise a drive portion and a wavelength recovery portion. The wavelength recovery portion of the drive current comprises a recovery amplitude IR that is distinct from the drive amplitude ID and a recovery duration tR that is less than the drive duration tD. The recovery amplitude IR and duration tR are sufficient to recover carrier density distribution distorted by gain compression effects prior to recovery. Additional embodiments are disclosed and claimed.
摘要翻译：本发明一般涉及半导体激光器和激光扫描系统，更具体地，涉及用于控制半导体激光器中的波长的方案。根据本发明的一个实施例，提供了一种使半导体激光器中的激光波长变化最小化的方法。根据该方法，一个或多个激光驱动电流被配置为包括驱动部分和波长恢复部分。驱动电流的波长恢复部分包括与驱动振幅ID不同的恢复幅度IR和小于驱动持续时间tD的恢复持续时间tR。恢复幅度IR和持续时间tR足以恢复在恢复之前由增益压缩效应失真的载流子密度分布。公开并要求保护附加实施例。

10. 发明授权

US07333687B2 Dual-filter architecture for reduced dispersion 失效
标题翻译：双滤波器结构，减少色散
公开(公告)号：US07333687B2
公开(公告)日：2008-02-19
申请号：US10766680
申请日：2004-01-27
申请人： Vikram Bhatia
发明人： Vikram Bhatia
IPC分类号： G02B6/28 , G02B6/26 , G02B6/30
CPC分类号： H04B10/25133 , H04J14/02
摘要： Chromatic dispersion of thin-film based mux/demux and add/drop modules can be reduced. Thin-film devices can be arranged in a specific order in the module. Multiple kinds of filters are used to remove “even” and “odd” channels, or other divisions of channels. At least one filter type can be designed for a higher dispersion in transmission but lower dispersion in reflection. At least another filter type can be designed in conjunction with the first filter type such that the sum of the dispersion from the reflection and that from transmission is as low as possible. This ensures that the overall dispersion of the odd and even channels is lower than what one can achieve with one uniform filter.
摘要翻译：可以减少基于薄膜的多路复用器/解复用器和分插模块的色散。薄膜器件可以按照模块中的特定顺序排列。使用多种滤波器去除“偶数”和“奇数”信道，或其他信道分割。至少一种滤波器类型可以设计用于传输中较高的色散，但反射率较低。至少另一种滤波器类型可以与第一滤波器类型一起设计，使得来自反射的色散和来自透射的色散的总和尽可能低。这确保奇数和偶数通道的总体色散低于使用一个均匀滤光片可实现的色散。

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