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    • 1. 发明授权
    • Ferrofluid 3-D gyroscope and light modulator
    • 铁磁流体3-D陀螺仪和光调制器
    • US06400457B2
    • 2002-06-04
    • US09861432
    • 2001-05-18
    • Weili LuoTengda DuJie Huang
    • Weili LuoTengda DuJie Huang
    • G01B902
    • G01P15/006G01P15/00G01P15/038G01P15/093G01P15/18
    • Apparatus and methods for passing a focused laser beam through a thin ferrofluid cell creates a spatial distribution in the refractive index of the ferrofluid and generates a diffraction ring patterns. Using a pair of perpendicularly placed ferrofluid cells, two sets of diffraction ring patterns can be produced on two viewing screens. Deformations in the diffraction patterns due to an acceleration can be viewed on the screens, providing a ferrofluid accelerometer. By applying an electric or a magnetic field on a thin ferrofluid sample, the light passing through the sample can be modulated by the field, providing a light modulator. The apparatus and method has applications for detecting acceleration information within a gyroscope and for use in toys.
    • 将聚焦激光束通过薄铁流体池的装置和方法在铁磁流体的折射率中产生空间分布并产生衍射环图案。 使用一对垂直放置的铁磁流体电池,可以在两个观察屏幕上产生两组衍射环图案。 可以在屏幕上观察由加速引起的衍射图案的变形,提供铁磁流体加速度计。 通过在薄的铁磁流体样品上施加电场或磁场,通过样品的光可以通过场调制,提供光调制器。 该装置和方法具有用于检测陀螺仪内的加速度信息并用于玩具中的应用。
    • 3. 发明授权
    • Hybrid cell
    • 混合细胞
    • US07106508B2
    • 2006-09-12
    • US10654261
    • 2003-09-03
    • Tengda DuXin LuoPing XieEvan Green
    • Tengda DuXin LuoPing XieEvan Green
    • G02B27/28
    • G02B6/12007G02B6/2861G02B6/2935G02B2006/12109G02B2006/12116G02B2006/12164
    • The present invention is a hybrid cell that utilizes a PBS pair in conjunction with a wedge tuner and a crystal to achieve a more stable interleaver. A first PBS splits an incoming optical signal into two orthogonally polarized beams which follow different optical paths through the cell. The length of the wedge tuner and crystal are selected such that the periodicity of the cell is approximately inversely proportional to the free spectral range at a target frequency. The length of the wedge tuner and crystal are also selected such that there is no change in an optical path difference between the two optical paths with respect to a change in temperature over an operating temperature range.
    • 本发明是利用PBS对与楔形调谐器和晶体结合以实现更稳定的交织器的混合单元。 第一PBS将输入的光信号分成两个正交偏振光束,该正交偏振光束遵循穿过单元的不同光路。 选择楔形调谐器和晶体的长度,使得单元的周期性与目标频率处的自由光谱范围大致成反比。 楔形调谐器和晶体的长度也被选择为使得两个光路之间的光程差相对于工作温度范围内的温度变化没有变化。
    • 4. 发明授权
    • Free-space optical isolator with integrated quarter-wave plate
    • 具有集成四分之一波片的自由空间光隔离器
    • US06977763B1
    • 2005-12-20
    • US10701674
    • 2003-11-05
    • Steve WangMingkun ShiFrank H. LevinsonTengda Du
    • Steve WangMingkun ShiFrank H. LevinsonTengda Du
    • G02B26/00G02B27/28G02F1/03
    • G02B27/286G02B27/288
    • The present invention provides low cost methods and apparatuses for filtering out polarized light reflections in a free-space optical isolator. In one embodiment, a laser directs a non-polarized optical signal through a series of polarizers and rotators in order to isolate an optical signal having a specific polarization. The present invention also includes a quarter-wave plate placed in series with the rotators and polarizers, to help filter away reflections occurring while the signal passes through free space. The inclusion of the quarter-wave plate helps filter away a greater amount of near-end reflections from going back to the laser, even with the use of low cost polarizers. Accordingly, the present invention can polarize an optical signal more efficiently than with prior methods, and at a much lower cost.
    • 本发明提供了用于过滤自由空间光隔离器中的偏振光反射的低成本方法和装置。 在一个实施例中,激光器通过一系列偏振器和旋转器引导非偏振光信号,以隔离具有特定极化的光信号。 本发明还包括与旋转器和偏振器串联布置的四分之一波片,以帮助滤除信号通过自由空间时发生的反射。 包括四分之一波片有助于滤除更大量的近端反射回到激光,即使使用低成本的偏振器。 因此,本发明可以比现有方法更有效地偏振光学信号,并且成本低得多。