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    • 18. 发明授权
    • Frequency locking of multisection laser diodes
    • 多段激光二极管的频率锁定
    • US07339962B2
    • 2008-03-04
    • US10489115
    • 2002-08-12
    • Thomas FarrellTommy MullaneDavid MacDonald
    • Thomas FarrellTommy MullaneDavid MacDonald
    • H01S3/13
    • H01S5/06256H01S5/0617H01S5/0687H01S5/1209
    • A multi-section laser diode control system comprising a multi-section laser diode (10), microprocessor controller (24), digital-to-analogue converter (28), driver circuit (30) and wavelength locker (14) is modified by inclusion of a locking circuit (40) which generates an analogue correction signal . . . 1 V ph responsive to measurements of the laser output made by the wavelength locker. The analogue correction signal is added to the preset phase voltage V ph asserted by the microprocessor controller to provide fast feedback that bypasses the microprocessor controller. This novel feedback is made possible by avoiding the use of the standard prior art control algorithm which requires a division calculation to be performed. Instead, novel control algorithms based purely on additions, subtractions and multiplications are used. The laser can thus be locked to its target output frequency without having to place slow analogue-to-digital and digital-to-analogue converters in the feedback control path.
    • 包括多段激光二极管(10),微处理器控制器(24),数模转换器(28),驱动电路(30)和波长锁存器(14)的多段激光二极管控制系统通过包含 锁定电路(40)产生模拟校正信号。 。 。 1 V ph响应于由波长锁定器制成的激光输出的测量。 模拟校正信号被添加到由微处理器控制器断言的预设相位电压V ph,以提供绕过微处理器控制器的快速反馈。 通过避免使用需要执行分割计算的标准现有技术控制算法,可以实现这种新颖的反馈。 相反,使用纯粹基于加法,减法和乘法的新型控制算法。 因此,激光器可以锁定到其目标输出频率,而不必在反馈控制路径中放置慢速模拟数字和数模转换器。
    • 20. 发明申请
    • Displacement measuring interferometer system and method using tunable lasers
    • 位移测量干涉仪系统和方法采用可调激光器
    • US20060126073A1
    • 2006-06-15
    • US11298068
    • 2005-12-09
    • Thomas FarrellDavid McDonald
    • Thomas FarrellDavid McDonald
    • G01B9/02
    • G01B11/026G02B6/29317G02B6/29359
    • A displacement measuring interferometer system and method for measuring the distance between two known points is disclosed. An interferometer is configured to provide a reference reflection of a reference point and a measurement reflection of a measurement point. A tunable laser is used to scan in wavelength into the interferometer to detect interferometer characteristics to measure the distance between the reference point and the measurement point from the interferometer characteristics. The invention describes a displacement measuring interferometer which uses a scanning tunable laser to accurately map out a fringe such that significant improvement in accuracy can be achieved by use of a tunable laser to scan the wavelengths and determine the fringe.
    • 公开了用于测量两个已知点之间的距离的位移测量干涉仪系统和方法。 干涉仪被配置为提供参考点的参考反射和测量点的测量反射。 使用可调谐激光器将波长扫描到干涉仪中以检测干涉仪特性,以从干涉仪特性测量参考点和测量点之间的距离。 本发明描述了一种位移测量干涉仪,其使用扫描可调谐激光器来精确地绘出边缘,使得可以通过使用可调谐激光器来扫描波长并确定边缘来实现精确度的显着改善。