THz generation by optical rectification of near
... The refractive index n3 and the absorption coefficient α3 were also measured at THz frequencies using THz time-domain spectroscopy. The refractive index drops from 2.3 to 2.2 as the THz frequency increases from 0.3 to 1.5 THz and matches the NIR group index well, in particular for wavelengths betwee ...
... The refractive index n3 and the absorption coefficient α3 were also measured at THz frequencies using THz time-domain spectroscopy. The refractive index drops from 2.3 to 2.2 as the THz frequency increases from 0.3 to 1.5 THz and matches the NIR group index well, in particular for wavelengths betwee ...
Optical polarization tutorial
... a half-wave plate with its optical axis oriented at angle φ, the polarization will rotate by 2|φ − θ| (Fig. A.3). Exercise A.2 What will a half-wave plate do with the elliptical polarization? Make a calculation and give a graphical description. 1 Birefringence, or double refraction, is an optical pr ...
... a half-wave plate with its optical axis oriented at angle φ, the polarization will rotate by 2|φ − θ| (Fig. A.3). Exercise A.2 What will a half-wave plate do with the elliptical polarization? Make a calculation and give a graphical description. 1 Birefringence, or double refraction, is an optical pr ...
Sodium vapor cell laser guide star experiments for continuous wave
... Figure 5 shows the power spectral density from the fast photodiode signal used in the self-heterodyne experiment. For the case of a Lorentzian-shaped laser power spectrum, the displayed lineshape width is twice the linewidth of the laser under test.13 A Lorentzian fit is applied to the data and the ...
... Figure 5 shows the power spectral density from the fast photodiode signal used in the self-heterodyne experiment. For the case of a Lorentzian-shaped laser power spectrum, the displayed lineshape width is twice the linewidth of the laser under test.13 A Lorentzian fit is applied to the data and the ...
Using ray matrices to derive analytical expressions of optical
... In summary, we have introduced a new way to treat spherical aberration in terms of the extended 3×3 ray matrix method. We believe this is a powerful tool to derive related analytical expressions which otherwise require very extensive derivations. Therefore it is a useful tool to teach aberrations to ...
... In summary, we have introduced a new way to treat spherical aberration in terms of the extended 3×3 ray matrix method. We believe this is a powerful tool to derive related analytical expressions which otherwise require very extensive derivations. Therefore it is a useful tool to teach aberrations to ...
Stellar Activity with SONG
... Half wave plate retards one polarisation by a half wavelength, or 180 degrees. This type of wave plate rotates the polarization direction of linear polarized light. ...
... Half wave plate retards one polarisation by a half wavelength, or 180 degrees. This type of wave plate rotates the polarization direction of linear polarized light. ...
Cold atoms: A field enabled by light - HAL
... form tightly-bound molecules with bosonic character) to the mechanism of BCS pairing (when they form weaklybound Cooper pairs), which is responsible for the lack of dissipation in ordinary superconductors. Optical Lattices. The second tool was provided by light in form of optical lattices. These are ...
... form tightly-bound molecules with bosonic character) to the mechanism of BCS pairing (when they form weaklybound Cooper pairs), which is responsible for the lack of dissipation in ordinary superconductors. Optical Lattices. The second tool was provided by light in form of optical lattices. These are ...
1.1 Objectives
... The phenomena associated with self-focusing of laser beams have been investigated since laser invention [1]. This kind of nonlinear propagation of a wave in a transparent medium particularly depends on the transversal intensity profile and power of the laser beam. Self-focusing is self-induced (Kerr ...
... The phenomena associated with self-focusing of laser beams have been investigated since laser invention [1]. This kind of nonlinear propagation of a wave in a transparent medium particularly depends on the transversal intensity profile and power of the laser beam. Self-focusing is self-induced (Kerr ...
Components of Optical Networks
... It is possible to do 1R regeneration optically (with all its benefits and drawbacks). Furthermore optical amplifiers have large gain bandwidths (one regenerator is enough for the entire band). But, they introduce additional noise (noise that accumulates). (Gain should be also flat over the entire ba ...
... It is possible to do 1R regeneration optically (with all its benefits and drawbacks). Furthermore optical amplifiers have large gain bandwidths (one regenerator is enough for the entire band). But, they introduce additional noise (noise that accumulates). (Gain should be also flat over the entire ba ...
The Time-Shift Technique for Measurement of Size and Velocity of
... The time-shift technique is used here in a somewhat modified form. This technique was first introduced by Semidetnov (1985) [3] and is further developed in Damaschke et al (2002) and Albrecht et al (2003). It is realized by creating an illuminated volume considerably smaller than the size of the par ...
... The time-shift technique is used here in a somewhat modified form. This technique was first introduced by Semidetnov (1985) [3] and is further developed in Damaschke et al (2002) and Albrecht et al (2003). It is realized by creating an illuminated volume considerably smaller than the size of the par ...
The Equation of Number the Total Internal of Reflection Angles
... close to the axis and at various angles, allowing efficient coupling of light into the fiber .However, this high numerical aperture increases the amount of dispersion as rays at different angles have different path length and therefore take different times to traverse the fiber.In graded – index fib ...
... close to the axis and at various angles, allowing efficient coupling of light into the fiber .However, this high numerical aperture increases the amount of dispersion as rays at different angles have different path length and therefore take different times to traverse the fiber.In graded – index fib ...
Fast-Fourier-domain delay line for in vivo optical coherence
... group delay. Although scan rates up to 28.6 kHz have been reported,9 these systems suffer from high nonlinearity in group delay because of the cube geometry, forcing a trade-off between larger size 共decreased nonlinearity兲 and scan rate. A scan rate of 2.58 kHz was achieved with the combination of a ...
... group delay. Although scan rates up to 28.6 kHz have been reported,9 these systems suffer from high nonlinearity in group delay because of the cube geometry, forcing a trade-off between larger size 共decreased nonlinearity兲 and scan rate. A scan rate of 2.58 kHz was achieved with the combination of a ...
Persistent spectral hole burning in an organic material for temporal
... take place in the Fourier-transform space. In the present work, correlation is effected between temporal shapes. The time-to-frequency Fourier transform of the reference pattern is recorded in a persistent spectral holeburning material. The reference image has to include phase and amplitude informat ...
... take place in the Fourier-transform space. In the present work, correlation is effected between temporal shapes. The time-to-frequency Fourier transform of the reference pattern is recorded in a persistent spectral holeburning material. The reference image has to include phase and amplitude informat ...
ps fiber laser for CARS-authorproof-v2
... the spectral sidebands that generally occur in soliton mode-locking. This is necessary to avoid subsequent preferential amplification of the sidebands. The SESAM is glued to the polished end of the fiber so the oscillator is alignment-free. With this design, a stable and self-starting mode-locked op ...
... the spectral sidebands that generally occur in soliton mode-locking. This is necessary to avoid subsequent preferential amplification of the sidebands. The SESAM is glued to the polished end of the fiber so the oscillator is alignment-free. With this design, a stable and self-starting mode-locked op ...
Nanosecond laser-induced breakdown in pure and - AS
... amplifiers. We used a pulsed, single longitudinal mode, TEM00 laser at 1.064 µm, with 7.5-nsec pulse duration, focused to a 7.45-µm-radius spot inside a fused silica window, to measure the single shot optical breakdown threshold irradiances of 4.7E11 and 6.4E11 W/cm2 respectively for pure fused sili ...
... amplifiers. We used a pulsed, single longitudinal mode, TEM00 laser at 1.064 µm, with 7.5-nsec pulse duration, focused to a 7.45-µm-radius spot inside a fused silica window, to measure the single shot optical breakdown threshold irradiances of 4.7E11 and 6.4E11 W/cm2 respectively for pure fused sili ...
Beam manipulation: prisms vs. mirrors
... are commonly used in beam manipulation applications include: the right angle prism, the dove prism, the rhomboid prism, and wedge prisms (see figure 6). The right angle prism is quite a versatile component. Depending on orientation, a right angle prism can either be used to turn a beam 90° by reflec ...
... are commonly used in beam manipulation applications include: the right angle prism, the dove prism, the rhomboid prism, and wedge prisms (see figure 6). The right angle prism is quite a versatile component. Depending on orientation, a right angle prism can either be used to turn a beam 90° by reflec ...
High-precision, high-accuracy ultralong-range swept
... Reducing the speed and sweep range enables meterdepth-range measurements (configuration C in Table 1). In this case, the trigger, OCT signal, and calibrating (MZI) signal were acquired using a 1 GHz oscilloscope. An optical fiber patchcord was inserted in one arm of a second MZI interferometer and i ...
... Reducing the speed and sweep range enables meterdepth-range measurements (configuration C in Table 1). In this case, the trigger, OCT signal, and calibrating (MZI) signal were acquired using a 1 GHz oscilloscope. An optical fiber patchcord was inserted in one arm of a second MZI interferometer and i ...
Doppler-Free Spectroscopy MIT Department of Physics
... or depopulation is central to saturated absorption laser spectroscopy. In the two-level case considered here, this phenomenon requires considerable laser power and/or a relatively long excited-state lifetime τ . The long lifetime helps because it delays the atom’s return to the original state. The p ...
... or depopulation is central to saturated absorption laser spectroscopy. In the two-level case considered here, this phenomenon requires considerable laser power and/or a relatively long excited-state lifetime τ . The long lifetime helps because it delays the atom’s return to the original state. The p ...
Ultrahigh-resolution optical coherence tomography
... near perfect cancellation of dispersion oscillations can be achieved. For practical reasons, 5:2 reflections on mirrors of type A and B are used instead of the optimum 6:2. This combination results in sufficiently flat dispersion characteristics so that broadband emission is obtained with a smooth m ...
... near perfect cancellation of dispersion oscillations can be achieved. For practical reasons, 5:2 reflections on mirrors of type A and B are used instead of the optimum 6:2. This combination results in sufficiently flat dispersion characteristics so that broadband emission is obtained with a smooth m ...
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Optical tweezers
Optical tweezers (originally called ""single-beam gradient force trap"") are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch to physically hold and move microscopic dielectric objects similar to tweezers. Optical tweezers have been particularly successful in studying a variety of biological systems in recent years.