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1. 发明申请

US20110038034A1 QUASI-PHASE-MATCHED WAVELENGTH CONVERTER 失效
标题翻译：相位匹配波长转换器
公开(公告)号：US20110038034A1
公开(公告)日：2011-02-17
申请号：US12855477
申请日：2010-08-12
申请人： Raman KASHYAP , Amirhossein Tehranchi
发明人： Raman KASHYAP , Amirhossein Tehranchi
IPC分类号： G02F1/37
CPC分类号： G02F1/3775 , G02F2202/20
摘要： There is provided an optical frequency converter comprising: an optical guiding structure having an input and an output, and comprising: a first grating portion adjacent to the input; a second grating portion adjacent to output, and a third grating between the first and second grating portion to form an apodized step-chirped grating extending between the input and the output. Each grating portion comprises a plurality of sections each comprising a plurality of segments. Each segment has a segment width and comprises a poled region having a poled width at least equal to one micron and a reversely poled region. The segment width for all of the grating portions and a duty ratio of the poled width to the segment width are constant within each section. The duty ratio increases within the first grating portion, decreases within the second grating portion, and is constant within the third grating portion.
摘要翻译：提供一种光学变频器，包括：具有输入和输出的光导结构，包括：与输入相邻的第一光栅部分; 与输出相邻的第二光栅部分和在第一和第二光栅部分之间的第三光栅，以形成在输入和输出之间延伸的变迹的步进啁啾光栅。每个光栅部分包括多个部分，每个部分包括多个部分。每个段具有段宽度并且包括具有至少等于1微米的极化宽度的极化区域和反向极化区域。所有光栅部分的片段宽度和极化宽度与片段宽度的占空比在每个部分内是恒定的。占空比在第一光栅部分内增加，在第二光栅部分内减小，并且在第三光栅部分内是恒定的。

2. 发明申请

US20120312028A1 METHODS FOR LASER COOLING OF FLUORESCENT MATERIALS 审中-公开
标题翻译：荧光材料激光冷却方法
公开(公告)号：US20120312028A1
公开(公告)日：2012-12-13
申请号：US13469635
申请日：2012-05-11
申请人： Raman KASHYAP , Galina NEMOVA
发明人： Raman KASHYAP , Galina NEMOVA
IPC分类号： F25B21/00
CPC分类号： F25B23/00
摘要： Methods for cooling fluorescent material are provided. A first method includes providing a sample of the material having an elongated direction of light propagation, exhibiting fluorescence at a mean fluorescence wavelength and capable of emitting superradiant pulses with a formation delay time. The method then involves generating a pump pulsed laser beam having a wavelength longer than the mean fluorescence wavelength, a pump power at which superradiant pulses are emitted and a pulse duration shorter than the formation delay time. The pulses are directed onto the sample along the direction of light propagation to produce the superradiant pulses in an anti-Stokes process inducing a cooling of the sample. A second laser cooling method includes a combination of a traditional anti-Stokes cooling cycle and an upconversion cooling cycle, wherein the two cooling cycles act cooperatively to cool the sample.
摘要翻译：提供了用于冷却荧光材料的方法。第一种方法包括提供具有细长的光传播方向的材料的样品，以平均荧光波长显示出荧光并且能够发射具有形成延迟时间的超辐射脉冲。该方法然后涉及产生具有比平均荧光波长长的波长的泵脉冲激光束，发射超辐射脉冲的泵浦功率和比形成延迟时间短的脉冲持续时间。沿着光传播的方向将脉冲引导到样品上，以在反斯托克斯方法中产生超辐射脉冲，引起样品的冷却。第二激光冷却方法包括传统的反斯托克斯冷却循环和上变频冷却循环的组合，其中两个冷却循环协同工作来冷却样品。

3. 发明申请

US20120106893A1 GRATING INSCRIBING IN OPTICAL WAVEGUIDES 审中-公开
标题翻译：光刻波形中的刻蚀
公开(公告)号：US20120106893A1
公开(公告)日：2012-05-03
申请号：US13286335
申请日：2011-11-01
申请人： Raman KASHYAP , Mathieu GAGNE
发明人： Raman KASHYAP , Mathieu GAGNE
IPC分类号： G02B6/34 , C03B37/10
CPC分类号： G02B6/02147 , G02B6/02133
摘要： There is described herein a method and system for inscribing gratings in optical waveguides. The waveguides may be hydrogen-free, germanium-free, low germanium, low hydrogen, and a combination thereof. Such gratings written in hydrogen-free fibers are suitable for sensor applications in which the use of hydrogen for photosensitizing fibers is undesirable owing to their increased sensitivity to nuclear radiation. The grating are formed by at least one pulse having a wavelength comprised between about 203 nm and about 240 nm. The laser source may be a Continuous Wave (CW) laser source or a pulsed laser source generating at least one pulse having a width in the order of nanoseconds (109).
摘要翻译：这里描述了一种在光波导中刻录光栅的方法和系统。波导可以是无氢的，无锗的，低锗的，低氢的，以及它们的组合。这种用无氢纤维编写的光栅适用于传感器应用，其中使用氢气来感光纤维是不希望的，因为它们对核辐射的敏感度增加。光栅由至少一个具有在约203nm和约240nm之间的波长的脉冲形成。激光源可以是连续波（CW）激光源或脉冲激光源，其产生具有大约数毫安（109）的宽度的至少一个脉冲。

4. 发明申请

US20090260501A1 MULTI-MODE OPTICAL FIBER SENSOR 审中-公开
标题翻译：多模光纤传感器
公开(公告)号：US20090260501A1
公开(公告)日：2009-10-22
申请号：US12426746
申请日：2009-04-20
申请人： Raman KASHYAP
发明人： Raman KASHYAP
IPC分类号： G10D3/10 , G02B6/00
CPC分类号： G01H9/004 , G01D5/35345 , G01K11/32 , G01L1/242
摘要： There is described an optical fiber sensor for sensing one of vibration, temperature, and strain, comprising: a laser source; a first single mode optical fiber having a first end and a second end, the first end connected to the laser source for receiving and propagating light from the laser source; a multimode optical fiber having a first end and a second end, the first end connected to the second end of the first single mode optical fiber for receiving the light and thereby exciting a plurality of modes of the multimode optical fiber, the multimode optical fiber being stretched at an out of band frequency and operated at a point at which an output is a linear function of a displacement of the multimode fiber; and a sampling photo-detector module connected to the second end of the multimode optical fiber for spatially filtering an output of the multimode fiber to obtain a spatially filtered interference pattern, and for detecting a variation of the spatially filtered interference pattern when one of the vibration, temperature, and strain is applied to the multimode optical fiber.
摘要翻译：描述了用于感测振动，温度和应变之一的光纤传感器，包括：激光源; 第一单模光纤，具有第一端和第二端，所述第一端连接到所述激光源，用于接收和传播来自所述激光源的光; 具有第一端和第二端的多模光纤，所述第一端连接到所述第一单模光纤的第二端，用于接收所述光，从而激发所述多模光纤的多种模式，所述多模光纤为在带外频率下拉伸，并在输出是多模光纤的位移的线性函数的点处操作; 以及连接到所述多模光纤的第二端的采样光检测器模块，用于对所述多模光纤的输出进行空间滤波以获得空间滤波的干涉图案，并且用于当所述振动中的一个振动，温度和应变被施加到多模光纤。

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