Ultrafast multiplex broadband optical switching in the infrared with a fluorinated polymer

Abstract

Frequency-resolved optical gating measurements with a sub-10-fs time resolution demonstrate that optical nonlinearities of fluorinated polymers (FPs) enable an ultrafast switching of ultrabroadband wavelength- and time-division multiplexed optical signals in the near-infrared (NIR) and short-wavelength infrared (SWIR) ranges. In the NIR region, the operation bandwidth of fluorinated polymer thin-film switches is mainly limited by material dispersion. In the SWIR range, material dispersion of a fluorinated polymer is much weaker. Low group delays (less than 40 attoseconds per 1 mm of polymer thickness per 1 THz of data-packet bandwidth) allow ultrafast optical switching of subpetahertz data packets.

Remote steering of laser beams by radar- and laser-induced refractive-index gradients in the atmosphere

“…The scalar approximation is accurate enough as long as the refractive index varies on a spatial scale much larger than the radiation wavelength, failing for nanowaveguide-type structures [13][14][15].…”

“…The macroscopic approach used above is valid when the radiation wavelength is much longer than the distance between atoms. The scalar approximation is accurate enough as long as the refractive index varies on a spatial scale much larger than the radiation wavelength, failing for nanowaveguide-type structures [13][14][15].…”

Ultrafast nonlinear-optical metrology of specialty fibers: parallel multimode fiber dispersion tracing by cross-correlation frequency-resolved optical gating

“…Cross-correlation frequency-resolved optical gating is a nonlinear-optical technique that is widely used for the characterization of ultrafast field waveforms [20,21], including light pulses with ultrabroadband, supercontinuum-type spectra [22][23][24]. This technique involves mixing the field waveform that needs to be characterized and a reference light pulse with a precalibrated spectrum and temporal envelope in a nonlinear crystal.…”

Analysis of using femtosecond laser scanning system to impurity-induced disordering of InGaAsP quantum wells

“…The interdiffusion between the quantum well (QW) and the adjacent barrier material was used for the selective control of energy band gap and other optical proper ties in different regions within the same epitaxial layer structure [28,29]. The impurity induced interdiffu sion technique is the commonly used intermixing 1 The article is published in the original. technique because of its ability to introduce defects densities.…”

“…In recent years, laser processing has become one of the most important tools for micro nano research, especially for femto second laser applications in the different technology fields [1][2][3][4], including semiconductor processing, solar photovoltaic, aerospace and military, laser abla tion [5][6][7], medical research [8][9][10][11], and other high precision technology development [12]. The femto second laser can achieve high precision machining at low temperature through photochemical machining, a two photon absorption mechanism, and a pulse fre quency (10 -15 ) that exceeds the thermal conductivity rate of the material (10 -12 ).…”