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Method for extra-high speed transformation of time signal into two-dimensional space signal

外国特許コード F110005571
整理番号 RJ001P01US
掲載日 2011年9月8日
出願国 アメリカ合衆国
出願番号 93752200
公報番号 7102810
出願日 平成12年3月24日(2000.3.24)
公報発行日 平成18年9月5日(2006.9.5)
国際出願番号 JP2000001816
国際公開番号 WO2000058784
国際出願日 平成12年3月24日(2000.3.24)
国際公開日 平成12年10月5日(2000.10.5)
優先権データ
  • 特願1999-083905 (1999.3.26) JP
  • 2000WO-JP01816 (2000.3.24) WO
発明の名称 (英語) Method for extra-high speed transformation of time signal into two-dimensional space signal
発明の概要(英語) (US7102810)
A signal light pulse to be converted into a two-dimensional space signal and a reference ultra-short light pulse are directed to a dispersion device, a second-harmonic is generated by introducing a one-dimensional frequency light distribution obtained by a one-dimensional Fourier transform lens, the second-harmonic is then subjected to time-to-space conversion through a one-dimensional Fourier transform lens so as to obtain a light wave distribution, and the light wave distribution is then subjected to filtering by a time-frequency filter provided on a filter plane of a one-dimensional space frequency filtering optical system and is further converted into a two-dimensional space signal corresponding to a time-frequency expanded two-dimensional light distribution which represents a relation between time and frequency of the signal pulse light.
Thereby, there is provided a specific technique of realizing ultra-fast conversion of signal form from time signal into two-dimensional space signal without any active-scan and also displaying the two-dimensional signal in a visible region with a temporally steady state.
特許請求の範囲(英語) [claim1]
1. A method for ultra-fast conversion of time signal into two-dimensional space signal, the method comprising: introducing a signal light pulse and a reference ultra-short light pulse having an appropriate width in space into a nonlinear crystal through a dispersion device and a one-dimensional Fourier transformation optical system;
subjecting a second-harmonic, which is generated by satisfying a phase matching condition in the nonlinear crystal, to time-to-space conversion through an inverse one-dimensional Fourier transformation optical system so as to be converted into a one-dimensional space distribution;
and subjecting the time-to-space converted one-dimensional space distribution to filtering with a time-frequency filter provided on a filter plane of a one-dimensional space frequency filtering optical system,wherein a time-frequency expanded two-dimensional light distribution representing a relation between time and frequency of the signal light pulse is regarded as a two-dimensional space signal.
[claim2]
2. A method for ultra-fast conversion of time signal into two-dimensional space signal, the method comprising: introducing a signal light pulse and a reference ultra-short light pulse having an appropriate width in space into a dispersion device at angles symmetric with respect to an optical axis;
passing light waves from the signal light pulse and the reference ultra-short light pulse, which are dispersed due to a time difference generated by a difference of incident positions on the dispersion device, through a one-dimensional Fourier transformation optical system so as to be converted into one-dimensional frequency light distributions having different incident angles depending on the incident positions on the dispersion device;introducing the one-dimensional frequency light distributions into a nonlinear optical crystal;subjecting a second-harmonic, which is generated by satisfying a phase matching condition determined depending on an angle formed by the incident one dimensional frequency light distributions, to time-to-space conversion through an inverse one-dimensional Fourier transformation optical system so as to be converted to a one-dimensional space distribution;converting the time-to-space converted one-dimensional space distribution into a one-dimensional space frequency distribution by a one-dimensional Fourier transformation optical system;subjecting the one-dimensional space frequency distribution to filtering by a time-frequency filter;
and subjecting the light wave thus obtained to time-frequency expansion through an inverse one-dimensional Fourier transform optical system so as to obtain an intensity distribution of a two-dimensional light distribution,wherein the time-frequency expanded two-dimensional light distribution representing a relation between time and frequency of the signal light pulse is regarded as a two-dimensional space signal.
[claim3]
3. The method for ultra-fast conversion of time signal into two-dimensional space signal according to claim 1, wherein a space frequency filter is employed as the time-frequency filter.
[claim4]
4. The method for ultra-fast conversion of time signal into two-dimensional space signal according to claim 1, wherein the time-frequency filter has a different transmissivity distribution and a vertical cut out position of a space frequency component of a light wave outputted from the one-dimensional Fourier Transform light system is arbitrarily selected.
[claim5]
5. The method for ultra-fast conversion of time signal into two-dimensional space signal according to claim 2, wherein a space frequency filter is employed as the time-frequency filter.
[claim6]
6. The method for ultra-fast conversion of time signal into two-dimensional space signal according to claim 2, wherein the time-frequency filter has a different transmissivity distribution and a vertical cut out position of a space frequency component of a light wave outputted from the one-dimensional Fourier Transform light system is arbitrarily selected.
[claim7]
7. The method for ultra-fast conversion of time signal into two-dimensional space signal according to claim 3, wherein the time-frequency filter has a different transmissivity distribution and a vertical cut out position of a space frequency component of a light wave outputted from the one-dimensional Fourier Transform light system is arbitrarily selected.
  • 発明者/出願人(英語)
  • ICHIOKA YOSHIKI
  • KONISHI TSUYOSHI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • 359/328
  • 359/326
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