Supercontinuum generation in 800-nm wavelength region with semiconductor laser pulses

2004 ◽  
Author(s):  
H. Yokoyama ◽  
M. Shirane ◽  
Y. Sasaki ◽  
H. Ito ◽  
H. Taniguchi
Keyword(s):  
Semiconductor Laser ◽  
Wavelength Region ◽  
Laser Pulses ◽  
Supercontinuum Generation

scholarly journals Circularly-polarized THz wave emission from a micro-thin water flow

2020 ◽  
Author(s):  
Hsin-Hui Huang ◽  
Saulius Juodkazis ◽  
Eugene Gamaly ◽  
Takeshi Nagashima ◽  
Tetsu Yonezawa ◽  
...  
Keyword(s):  
Water Flow ◽  
Wavelength Region ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Intense Laser ◽  
Practical Implementation ◽  
Focal Volume ◽  
Circularly Polarized ◽  
Thz Wave ◽  
Wave Emission

Abstract Intense THz wave sources are highly expected for further progresses in nonlinear THz science and practical implementation of non-ionizing radiation in sensing and communications. Solid-based sources have inherent limits of material breakdown, while intense laser irradiation of liquids is a promising emerging technique for THz wave and hard X-ray emission. Water-based THz emission shows intensity enhancements up to 103 times when laser-pulse pairs with nanosecond delay are used. Here we show circularly- polarized THz wave emission from thin water flow irradiated by two time-separated and linearly-polarized femtosecond laser pulses. THz time-domain spectroscopy reveals the circularly-polarized THz emission dominates 4.7 ns after the first pulse irradiation. THz wave detection delay in the spectroscopy and time-resolved micrography indicate that the THz wave emission originates from the rarefied volume in front of the flow. Radial relaxation of charges (currents) in the focal volume where ponderomotive charge depletion occurred is the origin for the circular polarization; tight focusing localized THz wave emission to the sub-wavelength region.

scholarly journals Supercontinuum generation in holey microstructure fibers by femtosecond laser pulses

2004 ◽  
Vol 53 (2) ◽  
pp. 478
Author(s):  
Li Shu-Guang ◽  
Ji Yu-Ling ◽  
Zhou Gui-Yao ◽  
Hou Lan-Tian ◽  
Wang Qing-Yue ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Supercontinuum Generation ◽  
Femtosecond Laser Pulses

scholarly journals Multioctave supercontinuum generation and frequency conversion based on rotational nonlinearity

2020 ◽  
Vol 6 (34) ◽  
pp. eabb5375 ◽  
Author(s):  
John E. Beetar ◽  
M. Nrisimhamurty ◽  
Tran-Chau Truong ◽  
Garima C. Nagar ◽  
Yangyang Liu ◽  
...  
Keyword(s):  
Frequency Conversion ◽  
Laser Pulses ◽  
Optical Nonlinearity ◽  
Supercontinuum Generation ◽  
Intense Laser ◽  
Short Pulses ◽  
Laser Amplifiers ◽  
Industrial Grade ◽  
Intense Laser Pulses ◽  
Nonlinear Compression

The field of attosecond science was first enabled by nonlinear compression of intense laser pulses to a duration below two optical cycles. Twenty years later, creating such short pulses still requires state-of-the-art few-cycle laser amplifiers to most efficiently exploit “instantaneous” optical nonlinearities in noble gases for spectral broadening and parametric frequency conversion. Here, we show that nonlinear compression can be much more efficient when driven in molecular gases by pulses substantially longer than a few cycles because of enhanced optical nonlinearity associated with rotational alignment. We use 80-cycle pulses from an industrial-grade laser amplifier to simultaneously drive molecular alignment and supercontinuum generation in a gas-filled capillary, producing more than two octaves of coherent bandwidth and achieving >45-fold compression to a duration of 1.6 cycles. As the enhanced nonlinearity is linked to rotational motion, the dynamics can be exploited for long-wavelength frequency conversion and compressing picosecond lasers.

Generation of short wavelength-tunable semiconductor laser pulses

1999 ◽  
Author(s):  
Dieter Huhse ◽  
Christian Warmuth ◽  
Markus Schulze ◽  
Dieter Bimberg
Keyword(s):  
Semiconductor Laser ◽  
Short Wavelength ◽  
Laser Pulses ◽  
Wavelength Tunable
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