Introduction

Grischkowsky, D.; Mittleman, Daniel M.

doi:10.1007/978-3-540-45601-8_1

Cited by 9 publications

(3 citation statements)

References 528 publications

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“…[14][15][16] The THz properties of materials are important for both investigating fundamental physical properties and for developing THz applications such as generators, detectors, and amplifiers in the THz region.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Wave Generation from GaP with Continuous Wave and Pulse Pumping in the 1–1.2 μm Region

Tanabe

Nishizawa²,

Suto³

et al. 2007

Mater. Trans.

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The terahertz (THz) region, which lies between the microwave and infrared regions, offers a wealth of untapped potential. We generated widely frequency-tunable coherent THz waves from GaP crystal pumped using continuous-wave (CW) semiconductor lasers and compared it with pulse pumping using Q-switched high-power lasers at 1-1.2 mm. THz wave generation was based on difference-frequency generation via the excitation of phonon-polaritons in GaP. CW THz waves were generated from GaP by enhancing the power density of the pumping light from semiconductor lasers. The power and phase-matched condition for THz wave generation are discussed with respect to the pumping method compared to pulse pumping. Semiconductor lasers have light power stability with a narrow linewidth. Therefore, CW THz waves can be used as a light source in high-resolution THz spectroscopy, as well as in multichannel communication.

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Section: Introductionmentioning

confidence: 99%

Terahertz Wave Generation from GaP with Continuous Wave and Pulse Pumping in the 1–1.2 μm Region

Tanabe

Nishizawa²,

Suto³

et al. 2007

Mater. Trans.

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“…A promising method involves the illumination by the pump beam of a larger area representing many pixels; a multi-element array detector such as a charge coupled device is used for detection [Wu et al 1996, Shan et al 2000, Ruffin et al 2001. More complete descriptions of terahertz imaging systems are available [Mittleman 2003]. …”

Section: Fig 2 Schematic Layout Of a Transmission Terahertz Pulsed mentioning

confidence: 99%

“…The most sensitive detectors of this type were liquid helium cooled bolometers, which give a relatively noisy signal and have low sensitivity. The key advances that have made terahertz imaging a practical proposition have been in the fields of ultrashort pulsed lasers, non-linear optics and crystal growth techniques [Grischkowsky and Mittleman 2003]. These have resulted in sources of bright, coherent, broadband terahertz pulses and enabled coherent room temperature detection [Auston and Nuss 1988].…”

Section: Introductionmentioning

confidence: 99%

Time-Frequency Analysis in Terahertz-Pulsed Imaging

Berry

Boyle²,

Fitzgerald

et al.

Advances in Pattern Recognition

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Recent advances in laser and electro-optical technologies have made the previously under-utilized terahertz frequency band of the electromagnetic spectrum accessible for practical imaging. Applications are emerging, notably in the biomedical domain. In this chapter the technique of terahertz pulsed imaging is introduced in some detail. The need for special computer vision methods, which arises from the use of pulses of radiation and the acquisition of a time series at each pixel, is described. The nature of the data is a challenge since we are interested not only in the frequency composition of the pulses, but also how these differ for different parts of the pulse. Conventional and short-time Fourier transforms and wavelets were used in preliminary experiments on the analysis of terahertz pulsed imaging data. Measurements of refractive index and absorption coefficient were compared, wavelet compression assessed and image classification by multidimensional clustering techniques demonstrated. It is shown that the timefrequency methods perform as well as conventional analysis for determining material properties. Wavelet compression gave results that were robust through compressions that used only 20% of the wavelet coefficients. It is concluded that the time-frequency methods hold great promise for optimizing the extraction of the spectroscopic information contained in each terahertz pulse, for the analysis of more complex signals comprising multiple pulses or from recently introduced acquisition techniques.

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Applications of Terahertz Wave Technology in Smart Textiles

Yang¹

2015

Handbook of Smart Textiles

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Introduction

Cited by 9 publications

References 528 publications

Terahertz Wave Generation from GaP with Continuous Wave and Pulse Pumping in the 1–1.2 μm Region

Terahertz Wave Generation from GaP with Continuous Wave and Pulse Pumping in the 1–1.2 μm Region

Time-Frequency Analysis in Terahertz-Pulsed Imaging

Applications of Terahertz Wave Technology in Smart Textiles

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Introduction

Cited by 9 publications

References 528 publications

Terahertz Wave Generation from GaP with Continuous Wave and Pulse Pumping in the 1&ndash;1.2 &mu;m Region

Terahertz Wave Generation from GaP with Continuous Wave and Pulse Pumping in the 1&ndash;1.2 &mu;m Region

Time-Frequency Analysis in Terahertz-Pulsed Imaging

Applications of Terahertz Wave Technology in Smart Textiles

Contact Info

Product

Resources

About

Terahertz Wave Generation from GaP with Continuous Wave and Pulse Pumping in the 1–1.2 μm Region

Terahertz Wave Generation from GaP with Continuous Wave and Pulse Pumping in the 1–1.2 μm Region