Topic
Femtosecond
About: Femtosecond is a research topic. Over the lifetime, 35106 publications have been published within this topic receiving 691405 citations. The topic is also known as: 1 E-15 s & fs.
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TL;DR: In this paper, the first THz imaging spectrometer based on continuous-wave THz radiation is presented, which uses a two-colour external-cavity laser diode.
Abstract: The first THz imaging spectrometer based on continuous-wave THz radiation is presented. The new setup is less expensive than conventional time-domain imaging systems that comprise femtosecond lasers. The system uses a two-colour external-cavity laser diode. Hence it is much more compact as compared to systems based on optically pumped solid-state lasers. As an example we investigate a human liver with metastasis.
168 citations
TL;DR: In this paper, the role of background gas in determining the spectral properties of silicon was analyzed in terms of femtosecond pulses in the presence of SF6, H2S, SiH4, and a mixture of Ar and SF6.
Abstract: We irradiated silicon with a train of femtosecond pulses in the presence of SF6, H2S, H2, SiH4, and a mixture of Ar and SF6 in order to analyze the role of the background gas in determining the mor...
168 citations
TL;DR: Femtosecond laser frequency combs are used to convert optical frequency references to the microwave domain, where the synthesis of 10-GHz signals having a fractional frequency instability of < or =3.3 fs is demonstrated.
Abstract: We use femtosecond laser frequency combs to convert optical frequency references to the microwave domain, where we demonstrate the synthesis of 10-GHz signals having a fractional frequency instability of ??3.5×10?15 at a 1-s averaging time, limited by the optical reference. The residual instability and phase noise of the femtosecond-laser-based frequency synthesizers are 6.5×10?16 at 1s and ?98dBc?Hz at a 1-Hz offset from the 10-GHz carrier, respectively. The timing jitter of the microwave signals is 3.3fs.
168 citations
TL;DR: In this article, a near-IR femtosecond laser was used to directly write a 1 cm long optical waveguide in Nd-doped silicate glass, achieving a gain of 1.5 dB/cm at a signal wavelength of 1054 nm.
Abstract: A near-IR (775 nm) femtosecond laser has been used to directly write a 1 cm long optical waveguide in Nd-doped silicate glass. A gain of 1.5 dB/cm was obtained at a signal wavelength of 1054 nm for /spl sim/346 mW of 514 nm pump power, in front of the input coupling objective.
167 citations
TL;DR: In this article, the real-time dynamics of wave packet resonance (due to photofragment trapping) in the reaction of NaI is reported using femtosecond transition-state spectroscopy (FTS).
167 citations