Abstract:
PROBLEM TO BE SOLVED: To provide a waveform reconstruction device capable of easily reconstructing the accurate time waveform of an optical signal without using an ultrafast time gate or a reference light source. SOLUTION: The waveform reconstruction device 140 includes: a phase spectrum calculation section 143 which calculates power spectrum of an output optical signal with respect to each of input optical signals with multiple intensities when a phase spectrum of each of the input optical signals with multiple intensities is assumed to have a predetermined phase spectrum, by simulating propagation of the input optical signal through an optical fiber using a parameter relating to self-phase modulation of the optical fiber, and calculates, as the phase spectrum of the input optical signal, the predetermined phase spectrum in which the difference value between the calculated power spectrum and a measured power spectrum is equal to or less than a predetermined threshold value; and a waveform reconstruction section 144 which reconstructs the time waveform of the input optical signal by frequency/time transforming the calculated phase spectrum and the power spectrum of the input optical signal. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
A terahertz spectrometer is provided to achieve the miniaturization of the terahertz spectrometer by inducing a pulse light to an emitter through an optical fiber without using an optical lens. A terahertz spectrometer includes an optical fiber(11C) and an emitter(12), and the emitter is distributed from a gain fiber configuring an ultra-short pulse oscillator. The emitter generates a terahertz wave by using the pulse light that passes through the optical fiber via the gain fiber, and the optical fiber offsets the spreading of the pulse width of the pulse light outputted from the gain fiber.
Abstract:
본 발명은 증기 투과속도의 측정을 위해 실행되는 캐비티 링-다운 분석기(CRDS) 기술을 이용하는 시스템 및 방법을 대상으로 한다. 일 실시예에서, 측정되는 증기 함량은 광 캐비티 내에 포함된다. 광이 그 다음에 한계치 수준까지 캐비티에 조사되며 조사된 광의 지연 시간이 측정된다. 조사된 광의 파장이 증기의 흡수 특징과 공진할 때, 감쇠 시간은 증기 함량의 기능으로서 선형으로 증가된다. 이 방식으로, 증기 함량은 더 긴 지연 시간을 야기하며 그에 따라 필름을 통과하는 증기의 양(필름 투과속도)이 실시간으로 판단될 수 있다.
Abstract:
PROBLEM TO BE SOLVED: To provide a terahertz spectroscopic apparatus for simplifying a constitution, and measuring a sample. SOLUTION: An optical fiber OF2 is directly coupled to a gain fiber 11C in an ultrashort fiber laser device 11 through an optical coupler 11D. A pulse light (a pump light) is output from the gain fiber 11C, and guided to an emitter 12 through the optical fiber OF2. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
A system and method of optical spectrum analysis that circumvents the trade-off between resolution and sensitivity by combining two spectral measurements: a first spectrum (102) from first spectral measurement means (240), having high resolution and low sensitivity; and a second spectrum (103) from second spectral measurement means (220), having lower resolution but higher resolution. The input of the of the first spectral measurement means (240) is amplified by an optical amplifier (230), being the effects induced by said amplifier (230) on the first spectrum (102) corrected at processing means (270) by comparison with the second spectrum (103).
Abstract:
A system (1; 2; 3) for coherent Raman spectroscopy, comprises a first optical parametric amplifier (30) providing a first light pulse (100), a pulsed laser (20) providing a second light pulse (200) such that a first fraction (201) of the second light pulse (200) pumps the first optical parametric amplifier (30), and a cw-laser (10) seeding the first optical parametric amplifier (30). Therein, the first light pulse (100) and a second fraction (202) of the second light pulse (200) are converted into a synchronised pump pulse (103) and Stokes pulse (203) for coherent Raman spectroscopy with a predetermined tunable frequency difference between the pump pulse (103) and the Stokes pulse (203).
Abstract:
A terahertz spectrometer includes an optical fiber and an emitter. The optical fiber is branched from a gain fiber constituting an ultra-short pulse oscillator. The emitter generates a terahertz wave from a pulse beam guided from the gain fiber through the optical fiber.
Abstract:
A broadband light source includes one or more laser diodes that are capable of generating a pump signal having a wavelength shorter than 2.5 microns, a pulse width of at least 100 picoseconds and a pump optical spectral width. The light source also includes one or more optical amplifiers that are coupled to the pump signal and are capable of amplifying the pump signal to a peak power of at least 500 W. The light source further includes a first fiber that is coupled to the one or more optical amplifiers. The first fiber including an anomalous group-velocity dispersion regime and a modulational instability mechanism that operates to modulate the pump signal. In one particular embodiment, the pump signal wavelength resides in the anomalous group-velocity dispersion regime of the first fiber and where different intensities in the pump signal can cause relative motion between different parts of the modulated pump signal produced through modulational instability in the first fiber. The light source also including a nonlinear element that is coupled to the first fiber that is capable of broadening the pump optical spectral width to at least 100 nm through a nonlinear effect in the nonlinear element.