A distance meter using a terahertz intermode beat in an optical frequency comb

Yokoyama, Shuko; Yokoyama, Tomoo; Hagihara, Yuki; Araki, Tsutomu; Yasui, Takeshi

doi:10.1364/oe.17.017324

Cited by 65 publications

(38 citation statements)

References 15 publications

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“…Multiheterodyne detection uses the detuning in mode spacing between two independent frequency combs to generate a different beat product from every unique pair of comb-lines, effectively mapping an optical spectrum into the RF domain, where a (spectrally) compressed comb is obtained. Similar techniques have been used in the past for spectroscopy [8], ranging [9,10], and linear characterization of optical elements [11]. In all of these cases, the comb sources are mutually coherent, which means that they share fluctuations which cancel out from the mixing products.…”

Section: Introductionmentioning

confidence: 96%

Multi-heterodyne mixing of frequency stabilized combs for ultrafast coherent signal processing

et al. 2010

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Fast and precise measurements of ultrafast optical waveforms are essential to the development of optical coherent signal processing. In this paper, multi-heterodyne mixing of stabilized optical frequency combs is presented as a simple technique for the measurement of ultrafast laser pulses and exotic arbitrary optical waveforms. This technique takes advantage of both the broadband nature of the frequency comb and the narrow line-width of the individual comb-lines to produce an array of radio-frequency beat-notes that share the characteristics of the optical spectrum. Measurements of comb characteristics across THz of bandwidth are enabled by this method, while maintaining the accuracy at the level of the individual comb-line width. Results show that both frequency modulation and amplitude modulation combs can be measured using this scheme.

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Section: Introductionmentioning

confidence: 96%

Multi-heterodyne mixing of frequency stabilized combs for ultrafast coherent signal processing

et al. 2010

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“…By resolving the coherent fringe the distance with higher accuracy also can be determined [7]. The accuracy less than an optical fringe of the distance measurement can be obtained with the combination of the time-of-flight [8] and coherent fringe-resolved techniques [9]. Other well-known approaches are intermode beats modification of the optical frequency comb and the used of the radio frequency (RF) range [10].…”

Section: Introductionmentioning

confidence: 99%

Optical frequency comb imaging using a single-pixel camera

Hayasaki

Pham

2014

2014 13th Workshop on Information Optics (WIO)

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We demonstrate an optical profilometer composed of an optical frequency comb source, a single pixel camera, and an optoelectronic interferometer in radio frequecny range. The system enables us to measure an object with a large depth much more than a light wavelength. The wide dynamic range is achieved by the high stability of the RF signal. The single pixel camera is used for two-dimensional imaging without a mechanical scanning, and the compressive sensing technique is used to reduce the number of measurements.

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“…The accuracy less than an optical fringe of the distance measurement can be obtained with the combination of the time-of-flight [9] and coherent fringe-resolved techniques [10]. Other well-known approaches are intermode beats modification of the optical frequency comb [11] and the used of the radio frequency range [12][13][14]. Technically, the object's profile can be absolutely determined by point-by-point measering the distance of all object's points, but it will be very time consuming and the accuracy is limited by the need to mechanically scan.…”

Section: Introductionmentioning

confidence: 99%

Optical frequency comb profilometry using a single-pixel camera

Hayasaki

Pham

2014

Optical Micro- And Nanometrology V

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We demonstrate an optical profilometer composed of an ultra-stabilized mode-locked femtosecond laser, a single pixel camera, and an optoelectronic interferometer. The combination of an optical frequency comb generated by the femtosecond laser and the optoelectronic interference in radio frequecny range enables us to measure an object with a large depth much more than a wavelength of light with a wide dynamic range giving no 2π phase ambiguity. The wide dynamic range is achieved by high stability of the optical frequency comb and easy selection of the frequency. The single pixel camera is used for twodimensional imaging without a mechanical scanning. It is performed by spatial light modulation of an object beam, the coherent summation of the spatially-modulated object beam with a single photo detector, and an inverse matrix calculation. We selected two approaches to reduce the number of measurements. One was the compressive sensing that well reduced the number when an object is sparse. The other was the reversal signal generation method that reduced the number to one-half of the sampling points for any object. We demonstrated the surface profilometry for an object with the depth of several centimeters.

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A distance meter using a terahertz intermode beat in an optical frequency comb

Cited by 65 publications

References 15 publications

Multi-heterodyne mixing of frequency stabilized combs for ultrafast coherent signal processing

Multi-heterodyne mixing of frequency stabilized combs for ultrafast coherent signal processing

Optical frequency comb imaging using a single-pixel camera

Optical frequency comb profilometry using a single-pixel camera

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