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... scattering at the boundary. However, the scattering inside the stadium is so weak that the spatial intensity distribution of lasing mode across the stadium could not be observed from the top. By tuning the bandpass filter away from cavity resonances, we took the near-field image of amplified spontan ...
... scattering at the boundary. However, the scattering inside the stadium is so weak that the spatial intensity distribution of lasing mode across the stadium could not be observed from the top. By tuning the bandpass filter away from cavity resonances, we took the near-field image of amplified spontan ...
Exp. 71 - Caltech
... Fabry-Perot cavities (also called Fabry-Perot etalons) are ubiquitous elements in optical physics, and they are used for such applications as sensitive wavelength discriminators, as stable frequency references, and for building up large field intensities with low input powers. Also, lasers are all ma ...
... Fabry-Perot cavities (also called Fabry-Perot etalons) are ubiquitous elements in optical physics, and they are used for such applications as sensitive wavelength discriminators, as stable frequency references, and for building up large field intensities with low input powers. Also, lasers are all ma ...
Laser-based displays: a review - Optical Microsystems Laboratory
... red VCSELs with an AlGaInP active region, which emit in the 650–690 nm region [28]. But the use of this wavelength region is not preferred for displays, as the human eye is less responsive here, requiring higher optical power from the red for effective white balancing of the display. More about colo ...
... red VCSELs with an AlGaInP active region, which emit in the 650–690 nm region [28]. But the use of this wavelength region is not preferred for displays, as the human eye is less responsive here, requiring higher optical power from the red for effective white balancing of the display. More about colo ...
EXPERIMENT 06 Helium Neon Laser
... neon are approximately 10 times longer as those of the pstates. An immediate population inversion between the 3s and the 2p levels will therefore be generated. The 2s level is emptied due to spontaneous emission into the 1s level. After this the neon atoms reaching their ground state again, primaril ...
... neon are approximately 10 times longer as those of the pstates. An immediate population inversion between the 3s and the 2p levels will therefore be generated. The 2s level is emptied due to spontaneous emission into the 1s level. After this the neon atoms reaching their ground state again, primaril ...
Optical cooling of interacting atoms in a tightly confined trap
... spin and external DOF, and between dispersive and dissipative effects. One such mechanism is the so-called Sisyphus cooling or polarization-gradient cooling mechanism [21, 23] which leads to temperatures much lower than Doppler cooling. The method of Sisyphus cooling of atoms was first proposed by P ...
... spin and external DOF, and between dispersive and dissipative effects. One such mechanism is the so-called Sisyphus cooling or polarization-gradient cooling mechanism [21, 23] which leads to temperatures much lower than Doppler cooling. The method of Sisyphus cooling of atoms was first proposed by P ...
The Construction and Characterization of a Magneto
... and the Doppler shifts in the atomic energy levels means that photons of a given frequency are only in resonance with atoms belonging to a narrow velocity group [2]. A cold (T ...
... and the Doppler shifts in the atomic energy levels means that photons of a given frequency are only in resonance with atoms belonging to a narrow velocity group [2]. A cold (T ...
workshop on laser-matter interaction 2010
... High Frequency Behaviour of the Maxwell-Bloch Model with Relaxations: Convergence to the Schrödinger-Boltzmann System ............................................. 27 On three-wave coupling system and the related simulations of the Brillouin Backscattering for ICF target. ........................... ...
... High Frequency Behaviour of the Maxwell-Bloch Model with Relaxations: Convergence to the Schrödinger-Boltzmann System ............................................. 27 On three-wave coupling system and the related simulations of the Brillouin Backscattering for ICF target. ........................... ...
Chapter 3 Passive resonators
... The first role of the laser is to provide a positive feedback in order to enhance the gain1 . Obviously, spectral properties of both the gain medium and the cavity will affect the final properties of the laser beam. In this chapter, we will look at the spectral properties of the cavity, but also see ...
... The first role of the laser is to provide a positive feedback in order to enhance the gain1 . Obviously, spectral properties of both the gain medium and the cavity will affect the final properties of the laser beam. In this chapter, we will look at the spectral properties of the cavity, but also see ...
LD Didactic (LEYBOLD) Scientific Teaching Manual
... almost excited using discharge lamps, optical pumpfrom state 4 to state 3 without radiation. The laser transiing with laser diodes is becoming more significant. tion takes place from level 3 into level 2 which is thermally 3. This is because laser diodes are available econominot populated. From her ...
... almost excited using discharge lamps, optical pumpfrom state 4 to state 3 without radiation. The laser transiing with laser diodes is becoming more significant. tion takes place from level 3 into level 2 which is thermally 3. This is because laser diodes are available econominot populated. From her ...
Intense, ultrashort light and dense, hot matter
... knowledge of NLO. As we saw, boosting of peak intensities implies boosting peak power of laser pulses. The peak power is boosted by successive amplification of laser pulses in a set of light amplifiers. As peak powers go up, the larger electric fields give rise to nonlinear processes. One of the non ...
... knowledge of NLO. As we saw, boosting of peak intensities implies boosting peak power of laser pulses. The peak power is boosted by successive amplification of laser pulses in a set of light amplifiers. As peak powers go up, the larger electric fields give rise to nonlinear processes. One of the non ...
Observation of Stimulated Emission of Surface Plasmon Polaritons Muralidhar Ambati, Sung Hyun Nam,
... SPP waveguides of different widths are transferred into the glass wafer substrates by photolithography and dry-etching process. The resulting depth of the trenches is around 22 nm. A thin film of pure gold (∼20 nm) with a flash of chromium (∼2 nm) is then evaporated to fill the trenches. The lift-of ...
... SPP waveguides of different widths are transferred into the glass wafer substrates by photolithography and dry-etching process. The resulting depth of the trenches is around 22 nm. A thin film of pure gold (∼20 nm) with a flash of chromium (∼2 nm) is then evaporated to fill the trenches. The lift-of ...
Nanosecond laser-induced breakdown in pure and - AS
... injection seeding control system requires constant feedback at the laser’s normal repetition rate of 10 Hz to servo-lock the Q-switched laser cavity length to resonance with the cw seed laser frequency and ensure reliable single-frequency output. In the laser’s normal single-shot mode, the laser cav ...
... injection seeding control system requires constant feedback at the laser’s normal repetition rate of 10 Hz to servo-lock the Q-switched laser cavity length to resonance with the cw seed laser frequency and ensure reliable single-frequency output. In the laser’s normal single-shot mode, the laser cav ...
Optical pumping of a lithium atomic beam for atom interferometry
... beams are imperfect: the polarizer or the quarter-wave plate may have small defects; the quarter-wave plate axis is not perfectly adjusted; the angle between the laser beam axis and the magnetic field is not exactly zero; the windows crossed by the laser beams when entering the vacuum chamber are sl ...
... beams are imperfect: the polarizer or the quarter-wave plate may have small defects; the quarter-wave plate axis is not perfectly adjusted; the angle between the laser beam axis and the magnetic field is not exactly zero; the windows crossed by the laser beams when entering the vacuum chamber are sl ...
Miscellaeous features - JLab Tech Notes Home Page
... The wavelength range of the laser will be 1–14 µm. This range was chosen to allow for the use of ZnSe windows in the optical transport. The system should be designed so that nothing fundamentally forbids operation at longer wavelengths. The gain is optimized if the optical mode is wrapped tightly ar ...
... The wavelength range of the laser will be 1–14 µm. This range was chosen to allow for the use of ZnSe windows in the optical transport. The system should be designed so that nothing fundamentally forbids operation at longer wavelengths. The gain is optimized if the optical mode is wrapped tightly ar ...
Advances in laser cooling of thulium-doped glass
... Moreover, parasitic absorption due to uncontrolled impurities in the material further limits the effective range of long-wavelength excitations. The practical range of the energy difference h f ⫺ h is of the order of thermal energy (k B T) as a consequence of the ground-state Boltzmann distribut ...
... Moreover, parasitic absorption due to uncontrolled impurities in the material further limits the effective range of long-wavelength excitations. The practical range of the energy difference h f ⫺ h is of the order of thermal energy (k B T) as a consequence of the ground-state Boltzmann distribut ...
CHAPTER 4---
... Figure 5.3-10 The use of Brewster windows in a gas laser provides a linearly polarized laser beam. Light polarized in the plane of incidence (the TM wave) is transmitted without reflection loss through a window placed at the Brewster angle. The orthogonally polarized (TE) mode suffers reflection los ...
... Figure 5.3-10 The use of Brewster windows in a gas laser provides a linearly polarized laser beam. Light polarized in the plane of incidence (the TM wave) is transmitted without reflection loss through a window placed at the Brewster angle. The orthogonally polarized (TE) mode suffers reflection los ...
Cavity-enhanced generation of 6 W cw second
... Generation (SHG) in QPM crystals, for frequencies from the IR to the UV range, in different configurations and emission regimes (pulsed or cw). Efficient cw SHG requires high power pump sources and long interaction lengths [2–7]. In single-pass generation optimal efficiency requires tight focusing c ...
... Generation (SHG) in QPM crystals, for frequencies from the IR to the UV range, in different configurations and emission regimes (pulsed or cw). Efficient cw SHG requires high power pump sources and long interaction lengths [2–7]. In single-pass generation optimal efficiency requires tight focusing c ...
Strong enhancement of light extraction efficiency in GaInAsP 2D
... [6]–[8]. An extraction efficiency of more than 20% was theoretically expected for a typical GaAs–AlAs DBR [9] and experimentally observed in a GaInAs LED with the DBR’s [10]. These values are limited by the existence of nonextracted guided and leaky modes. Further enhancement of the efficiency is ex ...
... [6]–[8]. An extraction efficiency of more than 20% was theoretically expected for a typical GaAs–AlAs DBR [9] and experimentally observed in a GaInAs LED with the DBR’s [10]. These values are limited by the existence of nonextracted guided and leaky modes. Further enhancement of the efficiency is ex ...
Ultrasensitive absorption spectroscopy with a high
... comparable to the intrinsic cavity loss, the gain rolls off as the absorption begins to limit the effective number of passes rather than the losses at the mirrors. The above analysis shows that the cavity provides tremendous signal gains even if the cavity resonances are completely suppressed. In fa ...
... comparable to the intrinsic cavity loss, the gain rolls off as the absorption begins to limit the effective number of passes rather than the losses at the mirrors. The above analysis shows that the cavity provides tremendous signal gains even if the cavity resonances are completely suppressed. In fa ...
Portable Ultrafast Blue Light Sources Designed With Frequency
... Straightforward frequency doubling of near-infrared femtosecond lasers remains one of the simplest and most efficient access routes into the blue spectral region, due mainly to the inherently high-peak intensities of the ultrashort laser pulses. While conventional titanium–sapphire lasers have long ...
... Straightforward frequency doubling of near-infrared femtosecond lasers remains one of the simplest and most efficient access routes into the blue spectral region, due mainly to the inherently high-peak intensities of the ultrashort laser pulses. While conventional titanium–sapphire lasers have long ...
Michelson Interferometer
... beam is approximately parallel with the top of the interferometer and strikes the mirror at the centre. 5. Set the viewing screen opposite of the adjustable mirror M2. Note that the viewing screen should be placed at 1-2meter from the adjustable mirror to get better resolution. 6. To get circular fr ...
... beam is approximately parallel with the top of the interferometer and strikes the mirror at the centre. 5. Set the viewing screen opposite of the adjustable mirror M2. Note that the viewing screen should be placed at 1-2meter from the adjustable mirror to get better resolution. 6. To get circular fr ...
Medical physics of diagnostic and therapeutic equipment_2
... A. devices for establishment of the spatial distributing in the organism of radionuclide B. devices, determining nature of radio-active element, patient artificially entered in an organism C. devices, comparing the image of sick tissue with the image of healthy tissue D. devices by which determine t ...
... A. devices for establishment of the spatial distributing in the organism of radionuclide B. devices, determining nature of radio-active element, patient artificially entered in an organism C. devices, comparing the image of sick tissue with the image of healthy tissue D. devices by which determine t ...
Department of medical physics diagnostic and treatment equipment
... 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 ...
Manipulation of two-level quantum systems with narrow transition
... with symmetrical frequency chirping and counterpropagating to the first asymmetrically chirped one interacts with all velocity groups of QS’s. This pulse excites the QS’s with v , v c and pushes them toward the central velocity in the direction of wave vector k2 by transmitting to them a momentum \k ...
... with symmetrical frequency chirping and counterpropagating to the first asymmetrically chirped one interacts with all velocity groups of QS’s. This pulse excites the QS’s with v , v c and pushes them toward the central velocity in the direction of wave vector k2 by transmitting to them a momentum \k ...
OSA journals template (MSWORD)
... A schematic diagram of the LOFI experimental setup is shown in Fig. 1(a). Typically, the laser is a CW microchip laser [20]. The laser beam is conventionally sent towards a frequency shifter that is composed of two acousto-optic deflectors (AOD), respectively supplied by a RF signal at 81.5 MHz and ...
... A schematic diagram of the LOFI experimental setup is shown in Fig. 1(a). Typically, the laser is a CW microchip laser [20]. The laser beam is conventionally sent towards a frequency shifter that is composed of two acousto-optic deflectors (AOD), respectively supplied by a RF signal at 81.5 MHz and ...
Laser pumping
Laser pumping is the act of energy transfer from an external source into the gain medium of a laser. The energy is absorbed in the medium, producing excited states in its atoms. When the number of particles in one excited state exceeds the number of particles in the ground state or a less-excited state, population inversion is achieved. In this condition, the mechanism of stimulated emission can take place and the medium can act as a laser or an optical amplifier. The pump power must be higher than the lasing threshold of the laser.The pump energy is usually provided in the form of light or electric current, but more exotic sources have been used, such as chemical or nuclear reactions.