Abstract:
본 발명은 펄스 레이저 생성기를 이용한 광섬유 센서 시스템에 관한 것으로서, 펄스 레이저 생성기에서 생성되는 펄스 레이저 광을 제1입력단으로부터 수신받아 제1출력단과 제2출력단으로 분기시켜 출력하고, 제1출력단과 제2출력단으로부터 역으로 각각 입력되는 광을 제3출력단을 통해 출력하는 메인 광커플러와, 제1출력단과 접속된 레퍼런스 광섬유와, 제2출력단과 접속되며 복수의 센싱 포인트에 대응되게 광섬유가 직렬 또는 병렬상으로 접속된 멀티 포인트 센싱 광섬유부와, 제3출력단과 접속된 광검출부와, 광검출부에서 출력되는 신호로부터 센싱포인트들에 대한 물리량의 변화를 검출하는 진단처리부를 구비한다. 이러한 센서 시스템에 의하면, 다수의 포인트에 대한 물리량의 측정이 용이하면서도 광검출부에 입력되는 광을 시간상으로 분석할 수 있어 분석을 위한 구조가 단순해 지는 장점을 제공한다.
Abstract:
A broadband optical accumulator and tunable narrowband optical source use a microstructured optical fiber into which optical energy is coupled at a first wavelength. The input optical energy is spectrally broadened as it propagates through the fiber, and the output signal is directed to a wavelength separator such as a Bragg grating. A narrowband portion of the output signal is redirected by the grating, while the remainder is reinjected into the fiber. Adjustment of the output wavelength band may be accomplished by changing the incidence angle of the output signal by pivoting the grating. The grating may be located in a housing and surrounded by index matching fluid, and the narrowband portion of the output signal isolated by the grating may be redirected to an output location by a reflector that moves with pivoting of the grating.
Abstract:
The present invention provides a light source apparatus capable of producing stable oscillation and performing high-speed wavelength sweeping over a desired wavelength range. A swept light source apparatus in which oscillation wavelength is continuously changeable is provided. The apparatus includes, inside a resonator, an optical amplification medium that amplifies light, a first device configured to disperse light emitted from the optical amplification medium and thus produce beams having different wavelengths, a second device functioning as a non-focusing optical element and configured to collimate the beams having different wavelengths resulting from the dispersion by the first device, and a selecting device configured to select a beam having a specific wavelength from among the beams collimated by the second device. The beam having the specific wavelength selected by the selecting device is fed back to the optical amplification medium.
Abstract:
A method of operating a laser projection system is provided. The projection system (100) comprises an external cavity laser (10), an optical intensity monitor (20), laser projection optics (30), and a controller (40). The external cavity laser comprises a laser diode, an intra-cavity wavelength conversion device (50), and a wavelength selective element (60). According to the method, the position of the wavelength selective element is adjusted relative to an optical axis Z of the external cavity laser to optimize output intensity. Specifically, the position of the wavelength selective element is adjusted by (i) tilting the wavelength selective element about its wavelength selective axis Y to reflect a wavelength of interest along an optimum path in an XZ plane of the external laser cavity and (ii) tipping the wavelength selective element about its wavelength insensitive axis X to reflect the wavelength of interest along an optimum path in a YZ plane of the external laser cavity. Additional embodiments are disclosed and claimed.
Abstract:
A compact mid-IR laser device utilizes an external cavity to tune the laser. The external cavity may employ a Littrow or Littman cavity arrangement. In the Littrow cavity arrangement, a filter, such as a grating, is rotated to provide wavelength gain medium selectivity In the Littman cavity arrangement, a reflector is rotated to provide tuning. A quantum cascade laser gain medium provides mid-IR frequencies suitable for use in molecular detection by signature absorption spectra. The compact nature of the device is obtained owing to an efficient heat transfer structure, the use of a small diameter aspheric lens for both the output lens and the external cavity lens and a monolithic assembly structure to hold the optical elements in a fixed position relative to one another. Efficient heat transfer is achieved using a thermo-electric cooler combined with a heat spreader onto which the quantum cascade laser gain medium is thermally coupled.
Abstract:
A high power narrow band, high repetition rate laser light source optical improvement apparatus and methods are disclosed with a fast angularly positionable mirror having a mirror mounting frame, a reflective optic with a coefficient different from that of the mounting frame, at least one flexure mount framed in the mounting frame that is flexible having flexure arm attached the flexture to the mounting frame. The apparatus may include a flexure force mechanism having an elongated rod. The force mechanism may prestress the flexure. The mirror maybe a grating which includes a substrate with metallic layer formed on the substrate, and a protective coating made of silica formed on the reflective metallic layer. The grating maybe actively tuned using an electro- or magneto- sensitive element. Oxides of the metal in the reflective layer may be removed by a hydrogen purge system exposed to deep ultraviolet radiation.
Abstract:
Ein hochrepetierendes Lasersystem nach dem Prinzip des wiederherstellbaren Verstärkers mit mindestens einem verstärkenden Lasermedium (6), einem Laserresonator mit mindestens einem Resonatorspiegel (5) und mindestens einem Modulator (3) und einer Pumpquelle, insbesondere eine Laserdiodenquelle, zum Pumpen des Lasermediums (6), wird durch Integration eines Pulsstreckers (7) mit struktur- und/oder materialbedingt hochdispersiver Wirkung in den Laserresonator kompakt ausgestaltet.
Abstract:
Wavelength stability of an optical oscillator has been enhanced by feedback from an external position-sensing detector to control the position or tilt of an intracavity optical element, such as a mirror. The wavelength stability results from stabilization of the intracavity beam position relative to an aperture in the oscillator. The wavelength selectivity of the aperture results from incorporation of a dispersive element in the oscillator cavity that produces a mapping of wavelength to beam position at the aperture.
Abstract:
Apparatus and method of providing an easily aligned directly pivotable grating suitable for high power agile wavelength laser tuners. A mounting and adjustment plane (26) is located on a rotational axis (28) and on a grating (27). An external adjustment mechanism and thermal bonding (40) reduce rotational moment and enable high power applications. The implementation is capable of utilizing grating blank materials that resist tapping or drilling. Low cost is achieved by construction in a matrix of ruling blanks (52) thereby complimenting the characteristics of ruling engines.