Polarized Light
... Whoa? What about unpolarized lasers??? • Coherence is an ideal, the phase of a laser eventually (in a coherence time) “forgets” is past – coherence time, or coherence length, varies greatly between different laser types – during a coherence time polarization of a laser stays constant – to acknowledg ...
... Whoa? What about unpolarized lasers??? • Coherence is an ideal, the phase of a laser eventually (in a coherence time) “forgets” is past – coherence time, or coherence length, varies greatly between different laser types – during a coherence time polarization of a laser stays constant – to acknowledg ...
Wavelength swept amplified spontaneous emission source
... physical limitations of the maximum achievable sweep speed could be overcome and additionally, high output power levels at low ASE background can be achieved. In FDML lasers, an optical delay line in the laser resonator enables to drive the tunable optical bandpass filter synchronously to the round ...
... physical limitations of the maximum achievable sweep speed could be overcome and additionally, high output power levels at low ASE background can be achieved. In FDML lasers, an optical delay line in the laser resonator enables to drive the tunable optical bandpass filter synchronously to the round ...
Medical physics of diagnostic and therapeutic equipment_2
... C. The longest time an unstable atom can exist in this unstable state D. The longest time an unstable atom can exist in this unstable state E. The average time it takes for the electron to decay from higher state to a lower state ANSWER: E CO2 laser is A. an atomic laser B. a laser that works with m ...
... C. The longest time an unstable atom can exist in this unstable state D. The longest time an unstable atom can exist in this unstable state E. The average time it takes for the electron to decay from higher state to a lower state ANSWER: E CO2 laser is A. an atomic laser B. a laser that works with m ...
Department of medical physics diagnostic and treatment equipment
... The kernel of atom consists of 90 protons and 144 neutrons. After emitting of two beta particles, and then one alpha-particle this kernel will have: ... A. 85 protons and 140 neutrons B. 87 protons and 140 neutrons C. 96 protons and 142 neutrons D. 90 protons and 142 neutrons E. 90 protons and 140 n ...
... The kernel of atom consists of 90 protons and 144 neutrons. After emitting of two beta particles, and then one alpha-particle this kernel will have: ... A. 85 protons and 140 neutrons B. 87 protons and 140 neutrons C. 96 protons and 142 neutrons D. 90 protons and 142 neutrons E. 90 protons and 140 n ...
Polarization effects and the calibration of a donut beam axial optical
... where φ is the azimuthal angle and l is an integer representing the topological charge. The result is a helical wave front with a phase singularity at the centre that produces a dark region along the optical axis. A more flexible way to introduce a spiral phase is with a phase-only spatial light mod ...
... where φ is the azimuthal angle and l is an integer representing the topological charge. The result is a helical wave front with a phase singularity at the centre that produces a dark region along the optical axis. A more flexible way to introduce a spiral phase is with a phase-only spatial light mod ...
The Impact of Energy Band Diagram and Inhomogeneous
... filling reduction whose peak values may exceed considerably the valence band peaks as seen in the large spacing cases of Fig. 1. However, the increase in differential gain is hindered by neutrality conditions which are only satisfied for high ground-state occupation of electrons. The electron-state ...
... filling reduction whose peak values may exceed considerably the valence band peaks as seen in the large spacing cases of Fig. 1. However, the increase in differential gain is hindered by neutrality conditions which are only satisfied for high ground-state occupation of electrons. The electron-state ...
Full-Text PDF
... cavity and how it affects the spatial mode and nonlinear response in ML operation, and the standard compensation for nonlinear astigmatism (and its disadvantages) are discussed. Dispersion management is addressed in Section 9: analytic expressions for calculating the group delay dispersion are provi ...
... cavity and how it affects the spatial mode and nonlinear response in ML operation, and the standard compensation for nonlinear astigmatism (and its disadvantages) are discussed. Dispersion management is addressed in Section 9: analytic expressions for calculating the group delay dispersion are provi ...
Thickness dependence of amplified spontaneous emission in low-absorbing organic waveguides
... range of thickness (far from hcut-off of the TE0 mode), λASE appears at approximately the same spectral position (very close to the maximum of the gain spectrum). On the other hand, in DFB lasers, λDFB is determined by the grating period and by the effective index (neff ) of the film. This latter pa ...
... range of thickness (far from hcut-off of the TE0 mode), λASE appears at approximately the same spectral position (very close to the maximum of the gain spectrum). On the other hand, in DFB lasers, λDFB is determined by the grating period and by the effective index (neff ) of the film. This latter pa ...
High-Power Diode Lasers under External Optical Feedback
... The general function of diode lasers is based on optical feedback. Photons emitted from the active region are backreflected by the AR and high-reflection (HR) mirrors into the gain medium. In this way, optical feedback is realized and finally controls the process of stimulated emission. This type of ...
... The general function of diode lasers is based on optical feedback. Photons emitted from the active region are backreflected by the AR and high-reflection (HR) mirrors into the gain medium. In this way, optical feedback is realized and finally controls the process of stimulated emission. This type of ...
A New Type of Frequency Chain and Its Application to Fundamental
... PCF and 73 fs pulses at 75 MHz repetition rate from a Mira 900 system (Coherent Inc.) we have seen an exceptionally broad spectrum from 450 to 1400 nm with excessive broadband noise, way above the shot noise. Using 25 fs pulses at a repetition rate of 625 MHz for the frequency chain reported below, ...
... PCF and 73 fs pulses at 75 MHz repetition rate from a Mira 900 system (Coherent Inc.) we have seen an exceptionally broad spectrum from 450 to 1400 nm with excessive broadband noise, way above the shot noise. Using 25 fs pulses at a repetition rate of 625 MHz for the frequency chain reported below, ...
Huge density-dependent blueshift of indirect excitons in biased
... redshift of the luminescence due to reduction of the GaAs band gap with increasing temperature.26 The initial redshift of the luminescence in Fig. 3共b兲 can be interpreted as arising from the gap shift of the lattice, which relaxes quickly back to the bath temperature of 2 K. In the case of Fig. 3共a兲 ...
... redshift of the luminescence due to reduction of the GaAs band gap with increasing temperature.26 The initial redshift of the luminescence in Fig. 3共b兲 can be interpreted as arising from the gap shift of the lattice, which relaxes quickly back to the bath temperature of 2 K. In the case of Fig. 3共a兲 ...
Feedback-induced catastrophic optical mirror damage
... Today broad area semiconductor lasers (BALs) have found a wide range of industrial, medical, scientific, space and military applications including the pumping of solid-state, disk and fiber lasers [1]. These high-power diode lasers are the most efficient narrow-band light sources and convert up to 7 ...
... Today broad area semiconductor lasers (BALs) have found a wide range of industrial, medical, scientific, space and military applications including the pumping of solid-state, disk and fiber lasers [1]. These high-power diode lasers are the most efficient narrow-band light sources and convert up to 7 ...
Slide 1
... For E-field out of plane, no interference for =45o since now the two E-fields are perpendicular. ...
... For E-field out of plane, no interference for =45o since now the two E-fields are perpendicular. ...
Laser Ignition in Internal Combustion Engines
... needed ignition energy in a very short time (pulse). So, this ignition process can also be achieved using quasi continuous wave (cw) lasers. Another type, resonant breakdown, involves non-resonant multi-photon dissociation of a molecule followed by resonant photo ionization of an atom. As well as ph ...
... needed ignition energy in a very short time (pulse). So, this ignition process can also be achieved using quasi continuous wave (cw) lasers. Another type, resonant breakdown, involves non-resonant multi-photon dissociation of a molecule followed by resonant photo ionization of an atom. As well as ph ...
Weak probe readout of coherent impurity orbital superpositions in
... THz-pumped orbital excitations of silicon impurities have been controlled and detected both incoherently and coherently to provide various dynamical timescales T1 [1, 8, 9] (including the ionised donor recombination rate [10] and the inter-donor tunnelling rate [11]), T2 [7] and T2* [8, 12]. The Blo ...
... THz-pumped orbital excitations of silicon impurities have been controlled and detected both incoherently and coherently to provide various dynamical timescales T1 [1, 8, 9] (including the ionised donor recombination rate [10] and the inter-donor tunnelling rate [11]), T2 [7] and T2* [8, 12]. The Blo ...
Ultracold Triplet Molecules in the Rovibrational
... two STIRAP pulses (diamonds in Fig. 2). Any such molecules would quickly be removed by laser 1 at the end of the first STIRAP pulse, which is kept on at maximum power for 1 s after ramping down laser 2. Thus, all molecules that are retrieved after the second STIRAP transfer have been deeply bound i ...
... two STIRAP pulses (diamonds in Fig. 2). Any such molecules would quickly be removed by laser 1 at the end of the first STIRAP pulse, which is kept on at maximum power for 1 s after ramping down laser 2. Thus, all molecules that are retrieved after the second STIRAP transfer have been deeply bound i ...
chenjiqualv04 - Physics at UC Merced
... The FWM phase-matching bandwidth can be continuous and hundreds of nanometers wide. ...
... The FWM phase-matching bandwidth can be continuous and hundreds of nanometers wide. ...
B. Gaussian Beam Transformation by a Lens.
... Some flats have surfaces that are at a slight angle to each other, forming a wedged flat. In this case the interference pattern due to a collimated beam will be alternating bright and dark fringes that are spaced as far apart as possible since the two reflected plane waves will be interfering at a ...
... Some flats have surfaces that are at a slight angle to each other, forming a wedged flat. In this case the interference pattern due to a collimated beam will be alternating bright and dark fringes that are spaced as far apart as possible since the two reflected plane waves will be interfering at a ...
PDF
... objects towards the focus with the highest intensity, and a stable trapping is achieved when they overcome the scattering and gravity forces. Usually, these objects (such as particles or biological cells) have a material composition and, thus, refractive indices different from that of the surroundin ...
... objects towards the focus with the highest intensity, and a stable trapping is achieved when they overcome the scattering and gravity forces. Usually, these objects (such as particles or biological cells) have a material composition and, thus, refractive indices different from that of the surroundin ...
polarization_magnifier
... For N silica plates with n = 1.45 (visible and near IR range) at Brewster incidence B = 55.4°, one obtains k = 1/(0.8737)N (see Appendix), while the transmission for the perpendicular component is Ty 1 . With the chosen value of N 6 , this leads to k = 2.247. However, due to the requirement tha ...
... For N silica plates with n = 1.45 (visible and near IR range) at Brewster incidence B = 55.4°, one obtains k = 1/(0.8737)N (see Appendix), while the transmission for the perpendicular component is Ty 1 . With the chosen value of N 6 , this leads to k = 2.247. However, due to the requirement tha ...
Theory of x-ray absorption by laser-dressed atoms
... i.e., F (r) ≈ r0 + (r − r0 ) eiθ . The parameter λ in Eq. (9) is a measure of how smooth the bending around r0 is; it is referred to as smoothness of the path. A complex electron coordinate transformation of the Hamiltonian with a smooth path is termed smooth exterior complex scaling (SES) [47]. Pra ...
... i.e., F (r) ≈ r0 + (r − r0 ) eiθ . The parameter λ in Eq. (9) is a measure of how smooth the bending around r0 is; it is referred to as smoothness of the path. A complex electron coordinate transformation of the Hamiltonian with a smooth path is termed smooth exterior complex scaling (SES) [47]. Pra ...
Synchronization of Micromechanical Oscillators Using Light
... resulting optical resonance splits into a symmetric, lower frequency mode (fig. 1c) and an anti-symmetric higher frequency mode (fig. 1d). Light coupled to any of these supermodes interacts with both the L and the R cavities and therefore we can choose to pump light only into one of the cavities (th ...
... resulting optical resonance splits into a symmetric, lower frequency mode (fig. 1c) and an anti-symmetric higher frequency mode (fig. 1d). Light coupled to any of these supermodes interacts with both the L and the R cavities and therefore we can choose to pump light only into one of the cavities (th ...
Program Overview Erich Ippen
... • Explore the possibilities for an atomic hydrogen optical clock • Develop and apply techniques for measuring the frequencies of optical transitions • Stimulate the development and application of optical frequency combs ...
... • Explore the possibilities for an atomic hydrogen optical clock • Develop and apply techniques for measuring the frequencies of optical transitions • Stimulate the development and application of optical frequency combs ...
Particles in a gas may be viewed as wavepackets with an extent of
... magnetic trapping schemes, as a prelude to the MOT) as well as a hybrid trap (MOT). I will then describe the theory of sub-Doppler cooling (including evaporative cooling). Following that will be a brief overview of a few of the variations on trapping schemes (both hybrid and magnetic) used in creati ...
... magnetic trapping schemes, as a prelude to the MOT) as well as a hybrid trap (MOT). I will then describe the theory of sub-Doppler cooling (including evaporative cooling). Following that will be a brief overview of a few of the variations on trapping schemes (both hybrid and magnetic) used in creati ...
Laser
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term ""laser"" originated as an acronym for ""light amplification by stimulated emission of radiation"". The first laser was built in 1960 by Theodore H. Maiman at Hughes Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow. A laser differs from other sources of light in that it emits light coherently. Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography. Spatial coherence also allows a laser beam to stay narrow over great distances (collimation), enabling applications such as laser pointers. Lasers can also have high temporal coherence, which allows them to emit light with a very narrow spectrum, i.e., they can emit a single color of light. Temporal coherence can be used to produce pulses of light as short as a femtosecond.Among their many applications, lasers are used in optical disk drives, laser printers, and barcode scanners; fiber-optic and free-space optical communication; laser surgery and skin treatments; cutting and welding materials; military and law enforcement devices for marking targets and measuring range and speed; and laser lighting displays in entertainment.