Vacuum-ultraviolet to infrared supercontinuum in hydrogen
... 2.5 μJ. At this pressure the zero-dispersion point is at 446 nm [Fig. 1(e)]. The supercontinuum spans from 124 to beyond 1200 nm—measurements with a mid-IR spectrometer (with uncalibrated absolute response) showed a strong signal from 1000 to 1200 nm [inset of Fig. 1(f)]. To check that the supercont ...
... 2.5 μJ. At this pressure the zero-dispersion point is at 446 nm [Fig. 1(e)]. The supercontinuum spans from 124 to beyond 1200 nm—measurements with a mid-IR spectrometer (with uncalibrated absolute response) showed a strong signal from 1000 to 1200 nm [inset of Fig. 1(f)]. To check that the supercont ...
OpticalDiagnostics-ScatteringDiagnostics
... “single point” diagnostics, i.e. the optics were only looking at one point. This seems archaic but it was still one of the better and more reliable diagnostics. ...
... “single point” diagnostics, i.e. the optics were only looking at one point. This seems archaic but it was still one of the better and more reliable diagnostics. ...
Metal-optic and Plasmonic Semiconductor
... Over the past few decades, semiconductor lasers have relentlessly followed the path towards miniaturization. Smaller lasers are more energy efficient, are cheaper to make, and open up new applications in sensing and displays, among many other things. Yet, up until recently, there was a fundamental p ...
... Over the past few decades, semiconductor lasers have relentlessly followed the path towards miniaturization. Smaller lasers are more energy efficient, are cheaper to make, and open up new applications in sensing and displays, among many other things. Yet, up until recently, there was a fundamental p ...
High frequency characterization of the Gsanger LM0202P eletro-optic [i.e. electro-optic] modulator
... implies that the behavior of a given source of monochromatic, linearly polarized ...
... implies that the behavior of a given source of monochromatic, linearly polarized ...
Interference [Hecht Ch. 9] Lai if necessary. 1
... Figure 4: The time-averaged intensity (blue) detected at the output of an interferometer plotted as a function of delay τ for the example waves in Figures 2 and 3. As the delay is changed by half a period, the interference switches between constructive and destructive. The black lines indicate the i ...
... Figure 4: The time-averaged intensity (blue) detected at the output of an interferometer plotted as a function of delay τ for the example waves in Figures 2 and 3. As the delay is changed by half a period, the interference switches between constructive and destructive. The black lines indicate the i ...
The List of Author`s Publications
... the laser medium, which leads to a spatial variation in temperature, and consequently internal stresses within the laser material and, in addition, deformation of the laser rod end faces due to differential expansion [12]. The net result is beam distortion due to thermal lensing, depolarization loss ...
... the laser medium, which leads to a spatial variation in temperature, and consequently internal stresses within the laser material and, in addition, deformation of the laser rod end faces due to differential expansion [12]. The net result is beam distortion due to thermal lensing, depolarization loss ...
Persistence of uranium emission in laser
... intensity and background increased with laser energy. For analytical applications, signal-to-noise (S/N) and signal-tobackground (S/B) ratios are important. In Fig. 3, the background-subtracted line intensity and signal to background ratio are plotted versus laser energy for the U I 356.18 nm line. ...
... intensity and background increased with laser energy. For analytical applications, signal-to-noise (S/N) and signal-tobackground (S/B) ratios are important. In Fig. 3, the background-subtracted line intensity and signal to background ratio are plotted versus laser energy for the U I 356.18 nm line. ...
5 The Basics of Confocal Microscopy
... high as sound i.e. “Acousto”. Light that passes the AOFT is diffracted depending on its own wavelength and the wavelength of the ultrasonic wave field. The ultrasonic wave field can be modulated so that the intensities of different laser lines can be changed between 0% to 100% by the software even d ...
... high as sound i.e. “Acousto”. Light that passes the AOFT is diffracted depending on its own wavelength and the wavelength of the ultrasonic wave field. The ultrasonic wave field can be modulated so that the intensities of different laser lines can be changed between 0% to 100% by the software even d ...
Pulsed Quasi-monochromatic x-ray source for radiography
... 3. Better spectral resolution can be obtained in the scheme when the radiation angle of incidence on the crystal surface is close to the crystal normal on the Rowland circle. On the other hand, it has various disadvantages over the flat crystal spectrometer such as 1. The bending of the crystals i ...
... 3. Better spectral resolution can be obtained in the scheme when the radiation angle of incidence on the crystal surface is close to the crystal normal on the Rowland circle. On the other hand, it has various disadvantages over the flat crystal spectrometer such as 1. The bending of the crystals i ...
Stable, mode-matched, medium-finesse optical cavity incorporating
... goal of observing and exploiting quantum aspects of either the radiation pressure or the micromechanical structures themselves. Outstanding goals in this area include laser cooling micromechanical systems,1,2 quantum-limited displacement measurements,3,4 generating squeezed5 and entangled6 light, an ...
... goal of observing and exploiting quantum aspects of either the radiation pressure or the micromechanical structures themselves. Outstanding goals in this area include laser cooling micromechanical systems,1,2 quantum-limited displacement measurements,3,4 generating squeezed5 and entangled6 light, an ...
New Approaches to Gyroscopic Lasers
... gain medium for the gyroscope. Both neodymium doped and erbium ytterbium co-doped phosphate glass lasers were constructed. Initially linear cavity designs were constructed to test the suitability of the gain media. Both laser systems employed longitudinal laser diode pumping. Thirty six perimeter ri ...
... gain medium for the gyroscope. Both neodymium doped and erbium ytterbium co-doped phosphate glass lasers were constructed. Initially linear cavity designs were constructed to test the suitability of the gain media. Both laser systems employed longitudinal laser diode pumping. Thirty six perimeter ri ...
Femtosecond laser pulse filamentation versus optical
... by the appearance of visible emission, the “flash” endpoint. The former definition is usually used when studying ultrashort pulses with durations shorter than 10 ps. In this case the threshold breakdown density is Ne th ≈ 1018 cm−3 . The latter definition is used for long pulses with durations on th ...
... by the appearance of visible emission, the “flash” endpoint. The former definition is usually used when studying ultrashort pulses with durations shorter than 10 ps. In this case the threshold breakdown density is Ne th ≈ 1018 cm−3 . The latter definition is used for long pulses with durations on th ...
"Theoretical Analysis of a Quartz-Enhanced Photoacoustic Spectroscopy Sensor",
... acoustic transducer [4]. A QEPAS sensor detects the weak acoustic pressure wave that is generated when optical radiation is absorbed by a trace gas. This pressure wave excites a resonant vibration of a quartz tuning fork (QTF) which is then converted into an electric signal (charge separation on the ...
... acoustic transducer [4]. A QEPAS sensor detects the weak acoustic pressure wave that is generated when optical radiation is absorbed by a trace gas. This pressure wave excites a resonant vibration of a quartz tuning fork (QTF) which is then converted into an electric signal (charge separation on the ...
Kerala University Optoelectronics Optical Communication
... level, density of states, life time and mobility of carriers, invariance of Fermi level at equilibrium, diffusion, continuity equation, excess carriers, quasi-fermi levels, optical properties, theory of recombination, radiative and non- radiative, absorption edge, photoconductivity, light emitting d ...
... level, density of states, life time and mobility of carriers, invariance of Fermi level at equilibrium, diffusion, continuity equation, excess carriers, quasi-fermi levels, optical properties, theory of recombination, radiative and non- radiative, absorption edge, photoconductivity, light emitting d ...
ABSTRACT PHOTON PAIR PRODUCTION FROM A HOT ATOMIC ENSEMBLE IN THE DIAMOND CONFIGURATION
... a laser pumped vapor cell of warm rubidium. The scheme takes advantage of a spontaneous four wave-mixing (4WM) interaction in the atoms to create photon pairs that are correlated in direction, frequency, polarization, and time. Correlated photon pairs have numerous applications and the main motivati ...
... a laser pumped vapor cell of warm rubidium. The scheme takes advantage of a spontaneous four wave-mixing (4WM) interaction in the atoms to create photon pairs that are correlated in direction, frequency, polarization, and time. Correlated photon pairs have numerous applications and the main motivati ...
13 Trapping and Cooling
... (on the average). Since the potential is harmonic this scheme applies to all pairs of neighboring motional states. Motional quanta are removed one-by-one in each optical cycle, and the ion ends up in the motional ground state which is then decoupled from the laser light. In experimental realizations ...
... (on the average). Since the potential is harmonic this scheme applies to all pairs of neighboring motional states. Motional quanta are removed one-by-one in each optical cycle, and the ion ends up in the motional ground state which is then decoupled from the laser light. In experimental realizations ...
Femtosecond self-guided atmospheric light strings
... the beam neither diffracts not self-focuses but instead maintains a stationary waveguide. A more refined calculation for a Gaussian beam yields a more accurate estimate of the critical power. Moreover, the critical power for collapse increases for ultrashort laser pulses when the wavelength is such ...
... the beam neither diffracts not self-focuses but instead maintains a stationary waveguide. A more refined calculation for a Gaussian beam yields a more accurate estimate of the critical power. Moreover, the critical power for collapse increases for ultrashort laser pulses when the wavelength is such ...
High resolution time-resolved imaging system in the
... originated from the fact that the spectral region is absorbed by air. The light in the VUV range should be used in a vacuum environment. The VUV radiations can be utilized for both bare and patterned wafer inspections by scattering. The intensity of scattered light is inversely proportional to its w ...
... originated from the fact that the spectral region is absorbed by air. The light in the VUV range should be used in a vacuum environment. The VUV radiations can be utilized for both bare and patterned wafer inspections by scattering. The intensity of scattered light is inversely proportional to its w ...
Chapter 3 Passive resonators
... properties of the laser beam. In this chapter, we will look at the spectral properties of the cavity, but also see how the cavity can shape the spatial structure of the laser beam. The cavity will affect 1. Direction of emission. The photons created by spontaneous emission will nearly all be elimina ...
... properties of the laser beam. In this chapter, we will look at the spectral properties of the cavity, but also see how the cavity can shape the spatial structure of the laser beam. The cavity will affect 1. Direction of emission. The photons created by spontaneous emission will nearly all be elimina ...
The Graduate School Eberly College of Science
... L1 drive the atom from the ground state to a virtually excited intermediate state i. Laser L2 then drives the atom from state i back to the desired excited state. It is important to note that the population in state i is virtual, and losses due to spontaneous emission are not allowed. By employing t ...
... L1 drive the atom from the ground state to a virtually excited intermediate state i. Laser L2 then drives the atom from state i back to the desired excited state. It is important to note that the population in state i is virtual, and losses due to spontaneous emission are not allowed. By employing t ...
design and analysis of variable gain amplifier with
... signal Power and pump Power are combined and through a WDM coupler and launched into an erbium doped. Its core is the erbium doped optical fiber system with the Erbium type material, which is typically a single-mode fiber. Pump light propagating along the EDF is depleted as erbium ions are raised to ...
... signal Power and pump Power are combined and through a WDM coupler and launched into an erbium doped. Its core is the erbium doped optical fiber system with the Erbium type material, which is typically a single-mode fiber. Pump light propagating along the EDF is depleted as erbium ions are raised to ...
PDF 170KB
... H27 and H13 promote transition to a virtual state near these levels. Depending on the laser wavelength, resonant excitation of 2s or 2p levels, in which fundamental photons may be involved in addition to harmonic photons, also takes place. In fact, the 2s level is excited through two-color two-photo ...
... H27 and H13 promote transition to a virtual state near these levels. Depending on the laser wavelength, resonant excitation of 2s or 2p levels, in which fundamental photons may be involved in addition to harmonic photons, also takes place. In fact, the 2s level is excited through two-color two-photo ...
Multifilamentation transmission through fog
... High-power, ultrashort 共femtosecond兲 laser pulses can propagate in air within a self-guided mode. This regime is often referred to as “filamentation” 关1兴. It requires that the beam power exceeds a critical power Pcr = 3.720 / 8n2, where n2 denotes the nonlinear Kerr index coefficient of dioxygen m ...
... High-power, ultrashort 共femtosecond兲 laser pulses can propagate in air within a self-guided mode. This regime is often referred to as “filamentation” 关1兴. It requires that the beam power exceeds a critical power Pcr = 3.720 / 8n2, where n2 denotes the nonlinear Kerr index coefficient of dioxygen m ...
2010_Haberberger
... At realistic pressures (~10atm), picosecond pulses can still be amplified by seeding a pulse with a spectrum that covers multiple rotational lines. In this case, the seed spectrum (assumed to be a smooth Gaussian) is filtered through amplification by the gain spectrum which has a modulation at 55GHz ...
... At realistic pressures (~10atm), picosecond pulses can still be amplified by seeding a pulse with a spectrum that covers multiple rotational lines. In this case, the seed spectrum (assumed to be a smooth Gaussian) is filtered through amplification by the gain spectrum which has a modulation at 55GHz ...
Ionization in strong low-frequency fields: from quantum S
... Substituting this into the TDSE shows that it does indeed work. Let’s be frank: Eq.(7) does not look very inviting. However, it this this general – and exact – expression where interesting approximations can be explicitly tried, sometimes based on rigorous math and sometimes based on physical reason ...
... Substituting this into the TDSE shows that it does indeed work. Let’s be frank: Eq.(7) does not look very inviting. However, it this this general – and exact – expression where interesting approximations can be explicitly tried, sometimes based on rigorous math and sometimes based on physical reason ...
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.