Efficient terahertz wave generation from GaP crystals pumped by chirp-controlled pulses from femtosecond photonic crystal fiber amplifier

Li, Jiang; Chai, Lu; Shi, Junkai; Liu, Bowen; Bo, Xu; Hu, Minglie; Li, Yanfeng; Xing, Qirong; Wang, Chingyue; Fedotov, A. B.; Желтиков, А. М.

doi:10.1063/1.4862270

Cited by 19 publications

(11 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pump pulses are pre-chirped by a −500 fs 2 dispersive mirror to compensate for the focusing lens, output coupler, and crystal dispersion. In comparison to other studies [23,24], we have not observed any significant dependence of the generated THz radiation on the chirp of the laser pulses. This can be explained by use of comparably thinner crystals in our study, which only cause less than 10% elongation of the driving IR laser pulse inside the crystal.…”

Section: Methodscontrasting

confidence: 89%

Optical rectification of ultrafast Yb lasers: pushing power and bandwidth of terahertz generation in GaP

et al. 2019

View full text Add to dashboard Cite

We demonstrate broadband high-power terahertz (THz) generation at megahertz repetition rates by optical rectification in GaP driven by an ultrafast Yb-based thin-disk laser (TDL) oscillator. We investigate the influence of pulse duration in the range of 50-220 fs and thickness of the GaP crystal on the THz generation. Optimization of these parameters with respect to the broadest spectral bandwidth yields a gap-less THz spectrum extending to nearly 7 THz. We further tailor the driving laser and the THz generation parameters for the highest average power, demonstrating 0.3 mW THz radiation with a spectrum extending to 5 THz. This was achieved using a 0.5 mm thick GaP crystal pumped with a 95 fs, 20 W TDL, operating at 48 MHz repetition rate. We also provide a simple method to estimate the THz spectrum, which can be used for design and optimization of similar THz systems

show abstract

Section: Methodscontrasting

confidence: 89%

Optical rectification of ultrafast Yb lasers: pushing power and bandwidth of terahertz generation in GaP

et al. 2019

View full text Add to dashboard Cite

show abstract

“…O ptical rectification (OR) of ultrashort pulses is widely used to generate broadband THz pulses. [1][2][3][4][5][6][7][8][9] Since it is based on the second-order optical nonlinearity of crystalline materials, the interaction volume can readily be scaled up (limited only by the crystal dimensions), while the intensity of the generated THz pulse is proportional to the pump pulse intensity squared. 5,6) These features are in stark contrast to those of a more traditional approach using photoconductive antennas (PCAs), 1) where the output power may be limited owing to the saturation of photocurrent in PCAs.…”

mentioning

confidence: 99%

Effects of chirp of pump pulses on broadband terahertz pulse spectra generated by optical rectification

Hamazaki

Furusawa

Sekine

et al. 2016

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

The effects of the chirp of the pump pulse in broadband terahertz (THz) pulse generation by optical rectification (OR) in GaP were systematically investigated. It was found that the pre-compensation for the dispersion of GaP is important for obtaining smooth and single-peaked THz spectra as well as high power-conversion efficiency. It was also found that an excessive amount of chirp leads to distortions in THz spectra, which can be quantitatively analyzed by using a simple model. Our results highlight the importance of accurate control over the chirp of the pump pulse for generating broadband THz pulses by OR.

show abstract

“…As a result, GaN devices offer higher output power and operation frequency compared with other conventional III-V devices. [221][222][223][224] The fundamental plasma frequency is given as E Q -T A R G E T ; t e m p : i n t r a l i n k -; e 0 0 1 ; 1 1 6 ; 7 2 3…”

Section: Advances In Terms Of Materialsmentioning

confidence: 99%

Survey of terahertz photonics and biophotonics

et al. 2020

View full text Add to dashboard Cite

We review the advances of terahertz (THz) science and technology in biophotonics, including related challenges and solutions. The main impediment to THz spectroscopy and imaging in this field is the high absorption of the THz beam in water. Hence, transmission imaging and spectroscopy of thick wet tissue using THz radiation has generally been quite difficult. However, the absorption of THz waves by water molecules is so strong that increasing the power of the THz source can lead to structural and functional changes in tissues, so solutions must go beyond a larger power output. In terms of resolution, THz imaging is superior to ultrasound but inferior to visible light microscopy. Owing to its unique material analysis capabilities, promising diagnosis applications have been demonstrated through THz imaging and spectroscopy. Unfortunately, many applications are limited by beam penetration depth and resolution. Hence, researchers from a wide variety of scientific and technical fields have been actively improving these features through the development of electronic devices and materials. In addition, groundbreaking optical architecture and materials to reduce beam absorption in the optics of a system and generate focused beams with smaller diameters have been proposed. On the software side, image processing techniques to computationally enhance the resolution and quality of THz imaging have been proposed. Data science and machine learning to automate the diagnosis of defects and diseases through processing THz images and spectroscopy data have been proposed. We have reviewed the applications of THz radiation in biophotonics and research achievements toward advancing these applications. A conclusion with a roadmap toward increasing the footprint of the THz technology in biophotonics is also proposed.

show abstract

Efficient terahertz wave generation from GaP crystals pumped by chirp-controlled pulses from femtosecond photonic crystal fiber amplifier

Cited by 19 publications

References 28 publications

Optical rectification of ultrafast Yb lasers: pushing power and bandwidth of terahertz generation in GaP

Optical rectification of ultrafast Yb lasers: pushing power and bandwidth of terahertz generation in GaP

Effects of chirp of pump pulses on broadband terahertz pulse spectra generated by optical rectification

Survey of terahertz photonics and biophotonics

Contact Info

Product

Resources

About