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1. 发明授权

US06617188B2 Quantum well intermixing 失效
公开(公告)号：US06617188B2
公开(公告)日：2003-09-09
申请号：US09802071
申请日：2001-03-08
申请人： Boon Siew Ooi , Yee Loy Lam , Yuen Chuen Chan , Yan Zhou , Siu Chung Tam
发明人： Boon Siew Ooi , Yee Loy Lam , Yuen Chuen Chan , Yan Zhou , Siu Chung Tam
IPC分类号： H01L2100
CPC分类号： B82Y20/00 , G02B2006/12128 , H01L21/182 , H01S5/026 , H01S5/2063 , H01S5/2068 , H01S5/3413 , H01S5/3414
摘要： The present invention provides a novel technique based on gray scale mask patterning (110), which requires only a single lithography and etching step (110, 120) to produce different thickness of SiO2 implantation mask (13) in selected regions followed by a one step IID (130) to achieve selective area intermixing. This novel, low cost, and simple technique can be applied for the fabrication of PICs in general, and WDM sources in particular. By applying a gray scale mask technique in IID in accordance with the present invention, the bandgap energy of a QW material can be tuned to different degrees across a wafer (14). This enables not only the integration of monolithic multiple-wavelength lasers but further extends to integrate with modulators and couplers on a single chip. This technique can also be applied to ease the fabrication and design process of superluminescent diodes (SLDs) by expanding the gain spectrum to a maximum after epitaxial growth.

2. 发明授权

US06661827B2 Pumping source 失效
标题翻译：泵送源
公开(公告)号：US06661827B2
公开(公告)日：2003-12-09
申请号：US10196664
申请日：2002-07-15
申请人： Yee Loy Lam , Yuen Chuen Chan , Siu Chung Tam
发明人： Yee Loy Lam , Yuen Chuen Chan , Siu Chung Tam
IPC分类号： H01S30941
CPC分类号： H01S3/025 , H01S3/0405 , H01S3/042 , H01S3/0941
摘要： A pumping module for use in a solid state laser comprises an annular array of laser diode segments (10) forming a passage (24), each segment (10) comprising an extended body supporting a laser diode array (17) that extends along the longitudinal axis of the segment (10) for directing light into the passage (24) from an inner face (12) of the annular array, wherein adjacent side faces of any two segments (10) in the annular array are in sealing engagement. The inner faces (12) of the array of segments (10) form a continuous surface so that coolant can flow between a laser rod and the segments (10) to reduce localized heating.
摘要翻译：用于固体激光器的泵送模块包括形成通道（24）的激光二极管段（10）的环形阵列，每个段（10）包括支撑沿纵向延伸的激光二极管阵列（17）的延伸体（10）的轴线，用于将光从环形阵列的内表面（12）引导到通道（24）中，其中环形阵列中任何两个段（10）的相邻侧面处于密封接合。节段（10）阵列的内表面（12）形成连续表面，使得冷却剂可以在激光棒和段（10）之间流动，以减少局部加热。

3. 发明授权

US06449049B1 Profiling of aspheric surfaces using liquid crystal compensatory interferometry 有权
标题翻译：使用液晶补偿干涉法分析非球面
公开(公告)号：US06449049B1
公开(公告)日：2002-09-10
申请号：US09540653
申请日：2000-03-31
申请人： Yee Loy Lam , Zhisheng Yun , Yan Zhou , Siu Chung Tam
发明人： Yee Loy Lam , Zhisheng Yun , Yan Zhou , Siu Chung Tam
IPC分类号： G01B902
CPC分类号： G01B11/255
摘要： A method for sensing and analyzing topographic properties of an aspheric test element is disclosed. The principle of the measurement technique is to immerse the element under test into a container filled with liquid crystal. A polarized plane wave passes through front and back precisely processed glass plates of the container sandwiched between a polarizer and an analyzer. The two side plates are not transited by the plane wave of light but are deposited with conductive layers in order to generate an electrical field between them. This DC (direct current) external electrical field is supplied to help to align the molecular direction of the liquid crystal. In a thus-induced desired configuration, the molecular direction of liquid crystal is aligned to be perpendicular to the incident plane wave front. As the plane light wave propagates through the liquid crystal in the container, it will be divided into ordinary and extraordinary beams. These two beams will create interference behind the analyzer. In the presence of the aspheric optical element under test, which is not a uniaxial crystal, a compensatory interferogram will be formed. Analysis of the interferogram will allow the user to determine the topographic surface profile of the aspheric element under test.
摘要翻译：公开了一种用于感测和分析非球面测试元件的地形特性的方法。测量技术的原理是将被测元件浸入装有液晶的容器中。极化平面波通过夹在偏振器和分析器之间的容器的前后精确加工的玻璃板。两个侧板不被光的平面波转移，而是沉积有导电层，以便在它们之间产生电场。该DC（直流）外部电场被提供以帮助对准液晶的分子方向。在如此诱导的期望构型中，液晶的分子方向与入射平面波前垂直。当平面光波通过容器中的液晶传播时，它将被分为普通和非凡光束。这两个光束将在分析仪后面产生干扰。在不是单轴晶体的非球面光学元件的存在下，将形成补偿干涉图。干涉图的分析将允许用户确定被测非球面元件的地形表面轮廓。

4. 发明授权

US06842466B1 Semiconductor passive Q-switch providing variable outputs 有权
标题翻译：半导体无源Q开关提供可变输出
公开(公告)号：US06842466B1
公开(公告)日：2005-01-11
申请号：US09618431
申请日：2000-07-18
申请人： Siu Chung Tam , Jian Hui Gu , Yee Loy Lam
发明人： Siu Chung Tam , Jian Hui Gu , Yee Loy Lam
IPC分类号： G02F1/35 , H01S3/00 , H01S3/0941 , H01S3/098 , H01S3/10 , H01S3/11 , H01S3/113 , H01S3/16
CPC分类号： H01S3/1118 , G02F1/3523 , H01S3/005 , H01S3/09415 , H01S3/113 , H01S3/1611 , H01S3/1673
摘要： A semiconductor wafer with variable transmittance, serves as a saturable absorber for performing passive Q-switching in a laser system to produce laser pulses having defined output characteristics. By translating or rotating the semiconductor saturable absorber, loss properties of a laser cavity may be altered. In this manner, the output characteristics of the laser pulses can be varied without changing other parameters of laser operation. The output characteristics may include pulse duration, pulse repetition rate, peak power and average output power of the laser pulses. The semiconductor wafer can be made of doped or undoped GaAs, AlGaAs, InP, etc. Furthermore, the tunable Q-switch may simultaneously serve as an output coupler for the laser cavity.
摘要翻译：具有可变透射率的半导体晶片用作可饱和吸收体，用于在激光系统中进行无源Q开关以产生具有确定的输出特性的激光脉冲。通过平移或旋转半导体可饱和吸收体，可以改变激光腔的损耗特性。以这种方式，可以改变激光脉冲的输出特性而不改变激光器操作的其它参数。输出特性可以包括激光脉冲的脉冲持续时间，脉冲重复率，峰值功率和平均输出功率。半导体晶片可以由掺杂或未掺杂的GaAs，AlGaAs，InP等制成。此外，可调Q开关可以同时用作激光腔的输出耦合器。

5. 发明申请

US20120262067A1 BATTERY OPERATED DEVICES 审中-公开
标题翻译：电池操作装置
公开(公告)号：US20120262067A1
公开(公告)日：2012-10-18
申请号：US13517080
申请日：2011-01-05
申请人： Siu Chung Tam , Ka Wai Eric Cheng , Yanjie Bao , Daohong Wang , Wai Pang Yau
发明人： Siu Chung Tam , Ka Wai Eric Cheng , Yanjie Bao , Daohong Wang , Wai Pang Yau
IPC分类号： H05B37/02
CPC分类号： H05B33/0845 , H02J7/345 , H02J7/35 , H02J9/005
摘要： A battery operated device such as a road stud comprises a micro-controller, a battery, and a light source. The micro-controller is configured to operate the battery to provide a train of power pulses to the light source, and each power pulse has a characteristic pulse period and a characteristic duty cycle comprising an on-cycle and an off-cycle. The micro-controller is turned on during the on-cycle and turned into a power saving or sleep mode during the off cycle. Setting the micro-controller into the power saving or sleep mode during the off cycle of the power pulse means substantial battery power saved to extend the operation time per charging of the battery.
摘要翻译：诸如公路螺柱的电池操作装置包括微控制器，电池和光源。微控制器被配置为操作电池以向光源提供一系列功率脉冲，并且每个功率脉冲具有特征脉冲周期和包括接通周期和截止周期的特征占空比。微控制器在打开循环期间打开，并在关闭循环期间变为省电或睡眠模式。在电源脉冲关闭周期期间将微控制器设置为省电或睡眠模式意味着节省大量电池电量，以延长电池每次充电的运行时间。

6. 发明授权

US06983057B1 Methods for embedding image, audio and video watermarks in digital data 失效
标题翻译：将图像，音频和视频水印嵌入数字数据的方法
公开(公告)号：US06983057B1
公开(公告)日：2006-01-03
申请号：US09701809
申请日：1998-06-01
申请人： Anthony Tung Shuen Ho , Siu Chung Tam
发明人： Anthony Tung Shuen Ho , Siu Chung Tam
IPC分类号： G06K9/00
CPC分类号： G06T1/0035 , G06T2201/0052 , G10L19/018 , G11B20/00884 , H04N1/32154 , H04N1/32165 , H04N1/32176 , H04N5/913 , H04N9/8042 , H04N9/8047 , H04N19/467 , H04N2005/91335 , H04N2201/3233 , H04N2201/327 , H04N2201/328 , H04N2201/3283
摘要： A method for embedding an entire image, audio or video watermark sequence within another image, audio or video data sequence with minimum loss of data quality is presented. The method exploits the de-correlation property of data coefficients in the orthogonal transform domain, similar to the application in data compression through transform coding. The present invention describes the usage of a Discrete Cosine Transform as the embedding domain. However, other orthogonal transforms such as Fourier, Walsh-Hadamard, Haar, Sine and Wavelet can also be used for this operation. A unique key derived adaptively from spatial locations registering the thresholds of the ac transform energies is used to unlock or de-watermark the embedded image or audio sequence. Moreover, an exponential filter has been developed to compress and expand the watermark coefficients prior to the embedding and retrieval process. The method can be used in resolving multimedia copyright protection issues arising on the Internet and in the music industry, such as the inclusion of a company's logo or an artist's recorded voice. The method can also be incorporated as a built-in feature for digital recording devices, such as still and video cameras, as well as more recent devices such as VCD and DVD players. Moreover, the method can be applied to the commercial and service sectors, where security in transmission and reception of private information in terms of speech or image is of the utmost importance.
摘要翻译：提出了一种将图像整体，音频或视频水印序列嵌入另一图像，数据质量损失最少的音频或视频数据序列的方法。该方法利用正交变换域中数据系数的去相关属性，与通过变换编码的数据压缩中的应用相似。本发明描述了使用离散余弦变换作为嵌入域。然而，其他正交变换，如傅立叶，沃尔什 - 哈达玛，哈尔，正弦和小波也可以用于此操作。用于自动地从注册交流变换能量的阈值的空间位置导出的唯一密钥用于解锁或去嵌入嵌入的图像或音频序列。此外，已经开发了一种指数滤波器来在嵌入和检索过程之前压缩和扩展水印系数。该方法可用于解决互联网和音乐行业产生的多媒体版权保护问题，例如包括公司标志或艺术家录制的声音。该方法还可以作为诸如静止和摄像机之类的数字记录设备的内置特征以及诸如VCD和DVD播放器的更新的设备。此外，该方法可以应用于商业和服务部门，其中私人信息在言语或图像方面的传输和接收的安全性是至关重要的。

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