Imaging scanning tunneling microscope
... The prospect of creating photonic devices based on surface plasmon propagation is attracting increasing attention.1–5 The motivation has been to create miniaturized optics that would enable higher bandwidth optical computing, all-optical interconnects for telecommunications, or even ‘‘nano-lasers.’’ ...
... The prospect of creating photonic devices based on surface plasmon propagation is attracting increasing attention.1–5 The motivation has been to create miniaturized optics that would enable higher bandwidth optical computing, all-optical interconnects for telecommunications, or even ‘‘nano-lasers.’’ ...
MEMS Tunable Silicon Fabry-Perot Cavity
... The devices are fabricated by silicon micromachining. We fabricate the Fabry Perot and the optical fiber grooves in one single step of deep reactive ion etching (DRIE) on a 70µm thick silicon on insulator (SOI) wafer. The process flow is shown on figure 3. (a) We start with 70µm thick device layer s ...
... The devices are fabricated by silicon micromachining. We fabricate the Fabry Perot and the optical fiber grooves in one single step of deep reactive ion etching (DRIE) on a 70µm thick silicon on insulator (SOI) wafer. The process flow is shown on figure 3. (a) We start with 70µm thick device layer s ...
Investigation of Physical Properties in II-VI
... wave guides and solar cells require knowledge of refractive index and Energy gap of all above Arsenide Group alloys. The Energy gap of Semiconductor alloys determines Threshold for absorption of photons in semiconductors. Refractive index is measure of transparency of Semiconductor alloys to inciden ...
... wave guides and solar cells require knowledge of refractive index and Energy gap of all above Arsenide Group alloys. The Energy gap of Semiconductor alloys determines Threshold for absorption of photons in semiconductors. Refractive index is measure of transparency of Semiconductor alloys to inciden ...
Phys. Rev. Lett. 102, 223901 (2009)
... lines spontaneous fluorescence. The second repumper at 854 nm is periodically blocked using a chopper. If this repumper is present [situation (a)], all ions stay in the cooling cycle. A blocked repumper leads to transfer of the ions into the dark state, and the fluorescence from the cooling laser de ...
... lines spontaneous fluorescence. The second repumper at 854 nm is periodically blocked using a chopper. If this repumper is present [situation (a)], all ions stay in the cooling cycle. A blocked repumper leads to transfer of the ions into the dark state, and the fluorescence from the cooling laser de ...
Laser and nonlinear optics
... Transitions from the pump level |3 > to the upper laser level |2 > and from the lower laser level |1 > to the ground state |0 > occur very rapidly (approx. 10−12 s) and without radiation (=heat), whereas state |2 > has a noticeably longer lifetime (approx. 3·10−4 s). Pump radiation can be absorbed b ...
... Transitions from the pump level |3 > to the upper laser level |2 > and from the lower laser level |1 > to the ground state |0 > occur very rapidly (approx. 10−12 s) and without radiation (=heat), whereas state |2 > has a noticeably longer lifetime (approx. 3·10−4 s). Pump radiation can be absorbed b ...
Tao Yuan, Jingzhou Xu, and Xicheng Zhang Rensselaer
... diffraction: x /NA, which is the so called Rayleigh Criterion. The limitation is more serious for THz image system because of the long wavelength used (~300 m for 1THz). Sub-wavelength resolution can be achieved by near field technology shown in figure 1 (b) and (c), which are subwavelength ape ...
... diffraction: x /NA, which is the so called Rayleigh Criterion. The limitation is more serious for THz image system because of the long wavelength used (~300 m for 1THz). Sub-wavelength resolution can be achieved by near field technology shown in figure 1 (b) and (c), which are subwavelength ape ...
Helium Neon Laser - Educational Lasers
... waist w’ outside of the resonator. The measurements of lateral intensity profiles are performed at different distances z behind the expected new waist w’. To do this, a waist meter or an aperture (diameter about 0.2 mm) with a large area photodiode can be used. The aperture has to be adjustable in b ...
... waist w’ outside of the resonator. The measurements of lateral intensity profiles are performed at different distances z behind the expected new waist w’. To do this, a waist meter or an aperture (diameter about 0.2 mm) with a large area photodiode can be used. The aperture has to be adjustable in b ...
Student Study Guide
... and consist of a positively charged nucleus of protons and neutrons orbited by a cloud of negatively charged electrons. Heat, light, and electricity are among the things that can excite atoms. Once excited, the atom’s electrons absorb energy and briefly move from their normal orbit level to one slig ...
... and consist of a positively charged nucleus of protons and neutrons orbited by a cloud of negatively charged electrons. Heat, light, and electricity are among the things that can excite atoms. Once excited, the atom’s electrons absorb energy and briefly move from their normal orbit level to one slig ...
Optical amplifier
An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Optical amplifiers are important in optical communication and laser physics.There are several different physical mechanisms that can be used to amplify a light signal, which correspond to the major types of optical amplifiers. In doped fibre amplifiers and bulk lasers, stimulated emission in the amplifier's gain medium causes amplification of incoming light. In semiconductor optical amplifiers (SOAs), electron-hole recombination occurs. In Raman amplifiers, Raman scattering of incoming light with phonons in the lattice of the gain medium produces photons coherent with the incoming photons. Parametric amplifiers use parametric amplification.