Optical Low-pass Filter
... optical low-pass filter, and this is proportional to the width of the low-pass filter. Pseudo-signal: Generated by solid-state image pickup devices, pseudo-signals causes horizontal lines to look jagged or the black-and-white lattice fringe to be colored. ...
... optical low-pass filter, and this is proportional to the width of the low-pass filter. Pseudo-signal: Generated by solid-state image pickup devices, pseudo-signals causes horizontal lines to look jagged or the black-and-white lattice fringe to be colored. ...
A method for controlling the bandwidth of high-energy, few
... 52 nm. The full width at half maximum (FWHM) of the pulse is found to be 18 fs at the energy 4 nJ (see Fig. 2). The wavelength of the oscillator beam can be tuned in the wavelength region 750–850 nm, using a variable optical slit and a couple of prisms. The Ti:sapphire emission is spread spatially a ...
... 52 nm. The full width at half maximum (FWHM) of the pulse is found to be 18 fs at the energy 4 nJ (see Fig. 2). The wavelength of the oscillator beam can be tuned in the wavelength region 750–850 nm, using a variable optical slit and a couple of prisms. The Ti:sapphire emission is spread spatially a ...
resolution
... D larger than optical case, but wavelength much larger (cm's to m's), e.g. for wavelength = 1 cm, diameter = 100 m, resolution = 20". ...
... D larger than optical case, but wavelength much larger (cm's to m's), e.g. for wavelength = 1 cm, diameter = 100 m, resolution = 20". ...
Investigation of possible microcavity effect on lasing threshold of nonradiative-scattering-dominated semiconductor lasers
... the medium). Thus, the material gain gmat, which is proportional to the pumping rate density, is purely a local property and completely independent of the boundary conditions of the cavity. In essence, the rate of spontaneous emission can certainly be altered by changing the electromagnetic mode den ...
... the medium). Thus, the material gain gmat, which is proportional to the pumping rate density, is purely a local property and completely independent of the boundary conditions of the cavity. In essence, the rate of spontaneous emission can certainly be altered by changing the electromagnetic mode den ...
Optical fiber sensors
... Susceptible to power fluctuation of the light source Susceptible to fiber bending losses Variation in modal power distribution in Multi-mode fiber (MMF) ...
... Susceptible to power fluctuation of the light source Susceptible to fiber bending losses Variation in modal power distribution in Multi-mode fiber (MMF) ...
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.