Minimally disruptive laser-induced breakdown in water
... pulses (filled circles) and 200-ps pulses (squares) in water. Each point is averaged over 100 pulses. In the 200-ps data, the open squares represent a range in pulse energy where some pulses produce no signal, while others significantly exceed the average. tently from shot-to-shot. This difference i ...
... pulses (filled circles) and 200-ps pulses (squares) in water. Each point is averaged over 100 pulses. In the 200-ps data, the open squares represent a range in pulse energy where some pulses produce no signal, while others significantly exceed the average. tently from shot-to-shot. This difference i ...
TDLS98AbBook
... This talk will review recent results from research conducted at the University of Oklahoma on the development of new IV-VI semiconductor (lead salt) epitaxial growth and laser fabrication procedures that can ultimately lead to dramatic increases in mid-IR laser operating temperatures. Work has focus ...
... This talk will review recent results from research conducted at the University of Oklahoma on the development of new IV-VI semiconductor (lead salt) epitaxial growth and laser fabrication procedures that can ultimately lead to dramatic increases in mid-IR laser operating temperatures. Work has focus ...
Ultrashort-Pulse Generation and Ultrafast Phenomena
... mirrors developed in our group, provide high reflectivity and well controlled dispersion over 400 nm in the case of single mirrors or even over one octave using specially matched mirror pairs. These components are a prerequisite for miniaturized ultrabroadband femtosecond lasers necessary for biomed ...
... mirrors developed in our group, provide high reflectivity and well controlled dispersion over 400 nm in the case of single mirrors or even over one octave using specially matched mirror pairs. These components are a prerequisite for miniaturized ultrabroadband femtosecond lasers necessary for biomed ...
LEP 2.6.07 Helium Neon Laser
... Moreover, the He-Ne laser requires a narrow capillary. The recombination process of the laser cycle takes place on its walls. As far as the active material is concerned, the diameter of the capillary should be as small as possible to enable an optimal laser output, but it should not be too small as ...
... Moreover, the He-Ne laser requires a narrow capillary. The recombination process of the laser cycle takes place on its walls. As far as the active material is concerned, the diameter of the capillary should be as small as possible to enable an optimal laser output, but it should not be too small as ...
Practical uses of femtosecond laser micro
... micro-chemistry. Laser ablation, because of its non-contact nature, allows the micromachining and surface patterning of materials with minimal mechanical and thermal deformation. It is now well known that for many of these applications, the femtosecond regime offers advantages over the nanosecond re ...
... micro-chemistry. Laser ablation, because of its non-contact nature, allows the micromachining and surface patterning of materials with minimal mechanical and thermal deformation. It is now well known that for many of these applications, the femtosecond regime offers advantages over the nanosecond re ...
Time of flight-photoemission electron microscope for ultrahigh
... 20 eV and the laser signal was used as a time marker for DLD. The slices are extracted from the full 3D (x, y, t) data stack by setting a condition for the arrival time of the photoelectrons in the TOF operation mode. Photoelectron generation with a 400 nm laser is a 2PPE process. This can be seen i ...
... 20 eV and the laser signal was used as a time marker for DLD. The slices are extracted from the full 3D (x, y, t) data stack by setting a condition for the arrival time of the photoelectrons in the TOF operation mode. Photoelectron generation with a 400 nm laser is a 2PPE process. This can be seen i ...
Sample pages 2 PDF
... Among energy states, the state with the lowest energy is most stable. Therefore, the electrons in semiconductors tend to stay in low energy states. If they are excited by thermal energy, light, or electron beams, the electrons absorb these energies and transit to high energy states. These transition ...
... Among energy states, the state with the lowest energy is most stable. Therefore, the electrons in semiconductors tend to stay in low energy states. If they are excited by thermal energy, light, or electron beams, the electrons absorb these energies and transit to high energy states. These transition ...
HOLOGRAM(REFLECTION)
... the incident diverged laser beam. As indicated above, in this geometry, the film itself serves as the beam splitter with the direct beam being the reference beam and the light from the object being the object beam. Film that fits the film holder has been precut and placed in a black envelope inside ...
... the incident diverged laser beam. As indicated above, in this geometry, the film itself serves as the beam splitter with the direct beam being the reference beam and the light from the object being the object beam. Film that fits the film holder has been precut and placed in a black envelope inside ...
Generation Of Coherent, Femtosecond, X-ray Pulses In The
... the fundamental beam without simultaneously obscuring the harmonic radiation. The lower efficiency of this grating results in much lower signal-to-noise ratio (SNR). Nevertheless, we can observe harmonic radiation transmitted through a 0.2- m Ti filter, terminating for wavelengths shorter than the T ...
... the fundamental beam without simultaneously obscuring the harmonic radiation. The lower efficiency of this grating results in much lower signal-to-noise ratio (SNR). Nevertheless, we can observe harmonic radiation transmitted through a 0.2- m Ti filter, terminating for wavelengths shorter than the T ...
a = l 0
... uncondensed polaritons can be neglected, is almost equidistant even for rather larger values of the polaritonpolariton interaction parameter inside the condensate. This makes polariton parabolic traps promising candidates for realization of bosonic cascade lasers. [T.C. H. Liew, et. al., Phys. Rev. ...
... uncondensed polaritons can be neglected, is almost equidistant even for rather larger values of the polaritonpolariton interaction parameter inside the condensate. This makes polariton parabolic traps promising candidates for realization of bosonic cascade lasers. [T.C. H. Liew, et. al., Phys. Rev. ...
Ultracold Hydrogen—D. Kleppner, T. J. Greytak
... 32-fold frequency divider and is then compared with the synthesizer signal in the digital phase detector. The properly filtered and amplified phase error signal controls the pump power via an acousto-optic modulator, which directly controls the carrier-envelope frequency of the modelocked laser [11] ...
... 32-fold frequency divider and is then compared with the synthesizer signal in the digital phase detector. The properly filtered and amplified phase error signal controls the pump power via an acousto-optic modulator, which directly controls the carrier-envelope frequency of the modelocked laser [11] ...
AHS用スキャニングレーザレンジファインダー の試作及びそれを用いた
... Fig. 6 illustrates the signals from the emitter, the ror falls out of the horizontal angular range. At this receiver and the reference threshold voltage. To moment, the laser beam emission is suppressed and measure the elapsed time between the emission and the acquired data starts to be processed. t ...
... Fig. 6 illustrates the signals from the emitter, the ror falls out of the horizontal angular range. At this receiver and the reference threshold voltage. To moment, the laser beam emission is suppressed and measure the elapsed time between the emission and the acquired data starts to be processed. t ...
Semiconductor microcavities: half light, half matter
... increases exponentially as the population of the initial state increases. The gain therefore also increases exponentially with pump power and can be higher than 107 cm–1. This gain is bigger than that of any other known material – a stunning finding that implies that semiconductor microcavities coul ...
... increases exponentially as the population of the initial state increases. The gain therefore also increases exponentially with pump power and can be higher than 107 cm–1. This gain is bigger than that of any other known material – a stunning finding that implies that semiconductor microcavities coul ...
Doppler-Free Saturated Absorption Spectroscopy of Rubidium Using a Tunable Diode Laser
... Tunable diode lasers are often used in atomic physics because they’re relatively inexpensive, reliable sources of narrow-band light [1]. By using a diode laser with a high reflectivity coating on its back facet and a reduced reflectivity on the output facet, along with a diffraction grating with a h ...
... Tunable diode lasers are often used in atomic physics because they’re relatively inexpensive, reliable sources of narrow-band light [1]. By using a diode laser with a high reflectivity coating on its back facet and a reduced reflectivity on the output facet, along with a diffraction grating with a h ...
Bismuth-doped optical fibers: a challenging active medium
... via observation in a limited spectral region. Such measurements do not allow one to interpret the luminescence spectra correctly. Recently, we measured the luminescence intensity Ilum of Bi-doped fibers based on both emission and excitation wavelengths within a wide spectral range of 450–1700 nm. Th ...
... via observation in a limited spectral region. Such measurements do not allow one to interpret the luminescence spectra correctly. Recently, we measured the luminescence intensity Ilum of Bi-doped fibers based on both emission and excitation wavelengths within a wide spectral range of 450–1700 nm. Th ...
DTS0116-Optical Coatings.qxd
... Q: What wavelength range for coating is available? A: We cover 300-2500 nm spectral range. Q: Can you custom design coatings for our application? A: Yes, we'll be glad to provide custom thin film designs. Keep in mind that for custom size parts a non-recurring engineering charge may be necessary to ...
... Q: What wavelength range for coating is available? A: We cover 300-2500 nm spectral range. Q: Can you custom design coatings for our application? A: Yes, we'll be glad to provide custom thin film designs. Keep in mind that for custom size parts a non-recurring engineering charge may be necessary to ...
Micro-machining with ultrashort laser pulses: From
... for all pulse duration values at about half the time. Additionally a negative conicity which is desirable for certain applications can be achieved easily, see Figure 15. The addition of a quarter wave plate to the optical setup allows to maintain the polarization in the p-orientation which turned ou ...
... for all pulse duration values at about half the time. Additionally a negative conicity which is desirable for certain applications can be achieved easily, see Figure 15. The addition of a quarter wave plate to the optical setup allows to maintain the polarization in the p-orientation which turned ou ...
Soliton pairs in a fiber laser: from anomalous to normal average
... K. Tamura, E. P. Ippen, H. A. Haus, and L. E. Nelson, “77-fs pulse generation from a stretched-pulse mode-locked all-fiber ring laser,” Opt. Lett. 18, 1080-1082 (1993). ...
... K. Tamura, E. P. Ippen, H. A. Haus, and L. E. Nelson, “77-fs pulse generation from a stretched-pulse mode-locked all-fiber ring laser,” Opt. Lett. 18, 1080-1082 (1993). ...
DFB Quantum Cascade Laser Arrays The Harvard community has
... ability to choose a desired mode/frequency of laser emission with a DFB grating. We apply a theoretical framework developed for general DFB gratings to analyze DFB-QCL arrays. We calculate how the performance characteristics of DFB-QCLs are affected by the coupling strength of the grating, and the r ...
... ability to choose a desired mode/frequency of laser emission with a DFB grating. We apply a theoretical framework developed for general DFB gratings to analyze DFB-QCL arrays. We calculate how the performance characteristics of DFB-QCLs are affected by the coupling strength of the grating, and the r ...
A pulsed dye laser for photo-ionization of magnesium atoms
... which uses a plane mirror and a grating in grazing incidence. When a grating is used in Littrow mount (diracted beam collinear with the incident beam) the resolution can be much improved by using a beam expander in the cavity. Early beam expanders consisted of a lens telescope (as in the Haensch de ...
... which uses a plane mirror and a grating in grazing incidence. When a grating is used in Littrow mount (diracted beam collinear with the incident beam) the resolution can be much improved by using a beam expander in the cavity. Early beam expanders consisted of a lens telescope (as in the Haensch de ...
Bichromatic Frequency Conversion in Potassium Niobate.
... generating intense blue light with convenient solidstate laser sources. Conversion eff iciencies of 50% or more can be achieved if the crystal is placed inside a passive buildup cavity that resonantly enhances the fundamental light.1 The fundamental IR radiation can be provided by high-power semicon ...
... generating intense blue light with convenient solidstate laser sources. Conversion eff iciencies of 50% or more can be achieved if the crystal is placed inside a passive buildup cavity that resonantly enhances the fundamental light.1 The fundamental IR radiation can be provided by high-power semicon ...
Helium Neon Laser - Abbe School of Photonics
... A helium-neon laser is a gas laser, consisting of a mixture of helium and neon gas in a ratio between 5:1 and 20:1 bound in a glass tube. The pump energy of the laser is provided by an electrical discharge of several hundred Volts between an anode and cathode at each end of the glass tube. A current ...
... A helium-neon laser is a gas laser, consisting of a mixture of helium and neon gas in a ratio between 5:1 and 20:1 bound in a glass tube. The pump energy of the laser is provided by an electrical discharge of several hundred Volts between an anode and cathode at each end of the glass tube. A current ...
Micron-scale modifications of Si surface morphology by pulsed
... become established as a standard manufacturing tool for controlling friction in the landing zone of the disk. Laser texturing does not rely on material removal—as, for example, is the case for laser drilling or laser ablation—but on hydrodynamic redistribution of the molten region produced by inhomo ...
... become established as a standard manufacturing tool for controlling friction in the landing zone of the disk. Laser texturing does not rely on material removal—as, for example, is the case for laser drilling or laser ablation—but on hydrodynamic redistribution of the molten region produced by inhomo ...
Laser and nonlinear optics
... Transitions from the pump level |3 > to the upper laser level |2 > and from the lower laser level |1 > to the ground state |0 > occur very rapidly (approx. 10−12 s) and without radiation (=heat), whereas state |2 > has a noticeably longer lifetime (approx. 3·10−4 s). Pump radiation can be absorbed b ...
... Transitions from the pump level |3 > to the upper laser level |2 > and from the lower laser level |1 > to the ground state |0 > occur very rapidly (approx. 10−12 s) and without radiation (=heat), whereas state |2 > has a noticeably longer lifetime (approx. 3·10−4 s). Pump radiation can be absorbed b ...
Continuous wave Nd:YAG channel waveguide laser produced by
... higher levels with respect to the bulk samples. Benefiting from high intracavity intensity owing to the reduced active volumes, waveguide lasers show many advantages when compared to their bulk counterparts, such as lower threshold and higher laser slope efficiencies [1]. Those features make wavegui ...
... higher levels with respect to the bulk samples. Benefiting from high intracavity intensity owing to the reduced active volumes, waveguide lasers show many advantages when compared to their bulk counterparts, such as lower threshold and higher laser slope efficiencies [1]. Those features make wavegui ...
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.