Simultaneous Measurements of Hard X Rays and Second
... early during the laser pulse, before a sizable plasma has developed. Following these considerations, another mechanism must be considered in the analysis presented so far, which can strongly influence the evolution of plasma waves and, consequently, the generation of second-harmonic radiation. It is ...
... early during the laser pulse, before a sizable plasma has developed. Following these considerations, another mechanism must be considered in the analysis presented so far, which can strongly influence the evolution of plasma waves and, consequently, the generation of second-harmonic radiation. It is ...
PP_SSL_Modeling - LAS
... Computation of the transverse modes by the use of the Gaussian Mode ABCD Matrix Approach is very fast and powerful. It delivers in many cases results which are in good agreement with measurements. This has been proved by many users of the program LASCAD. ...
... Computation of the transverse modes by the use of the Gaussian Mode ABCD Matrix Approach is very fast and powerful. It delivers in many cases results which are in good agreement with measurements. This has been proved by many users of the program LASCAD. ...
Proposal for an Optical Laser Producing Light at Half the... Frans Godschalk, Fabian Hassler, and Yuli V. Nazarov
... In conventional lasers, the driving is due to a population inversion that originates from dissipative transitions in an open system. For the HJL, the SC drive is not dissipative by itself: Only the emission of photons from the cavity is a dissipative process. The driving originates from coherent mix ...
... In conventional lasers, the driving is due to a population inversion that originates from dissipative transitions in an open system. For the HJL, the SC drive is not dissipative by itself: Only the emission of photons from the cavity is a dissipative process. The driving originates from coherent mix ...
Synopsis by Brad Thompson
... Laser resonators utilizing porro prism reflectors as opposed to the conventional mirror-mirror cavity are significantly more stable. This stability makes the porro resonator an ideal choice for a coherent light source in Laser Rangefinders where the stability of the bore-sight is paramount. However, ...
... Laser resonators utilizing porro prism reflectors as opposed to the conventional mirror-mirror cavity are significantly more stable. This stability makes the porro resonator an ideal choice for a coherent light source in Laser Rangefinders where the stability of the bore-sight is paramount. However, ...
Atomic Spectra - Flinn Scientific
... The phenomenon of atomic spectra has been known since the mid-1800s. Their cause, however, remained unexplained until the structure of the atom and, in particular, its electronic structure, was solved. Rutherford’s discovery of the nucleus of the atom in 1911 answered many questions concerning the s ...
... The phenomenon of atomic spectra has been known since the mid-1800s. Their cause, however, remained unexplained until the structure of the atom and, in particular, its electronic structure, was solved. Rutherford’s discovery of the nucleus of the atom in 1911 answered many questions concerning the s ...
XIII. GRAVITATION RESEARCH Academic and Research Staff Prof
... The single longitudinal-mode laser cavity has been described by Smith,2 and consists of a long and a short cavity that are coupled by means of a beam splitter. efficient coupling, the two cavities must be mode-matched. condition has been given elsewhere. ...
... The single longitudinal-mode laser cavity has been described by Smith,2 and consists of a long and a short cavity that are coupled by means of a beam splitter. efficient coupling, the two cavities must be mode-matched. condition has been given elsewhere. ...
2-2.7µm single frequency tunable Sb–based lasers operating in CW
... To-date QW lasers have been successfully operated in the CW regime at RT in the range from 2.0 to 3.04µm.4, 5 The materials having led to the best results are without doubt found in the system GaInAsSb/AlGaAsSb grown on a GaSb substrate. QWs are usually made of compressively strained GaInAsSb layers ...
... To-date QW lasers have been successfully operated in the CW regime at RT in the range from 2.0 to 3.04µm.4, 5 The materials having led to the best results are without doubt found in the system GaInAsSb/AlGaAsSb grown on a GaSb substrate. QWs are usually made of compressively strained GaInAsSb layers ...
ece477_4_0
... • Lasing is the condition at which light amplification becomes possible by virtue of population inversion. Then, stimulated emission rate into a given EM mode is proportional to the intensity of the optical radiation in that mode. In this case, the loss and gain of the optical field in the optical p ...
... • Lasing is the condition at which light amplification becomes possible by virtue of population inversion. Then, stimulated emission rate into a given EM mode is proportional to the intensity of the optical radiation in that mode. In this case, the loss and gain of the optical field in the optical p ...
Mode-locking of a CW laser 1 Introduction
... That is, we obtain a train of Gaussian pulses of width 1/Ωg at a repetition rate of c/2L as shown in Fig. (1d). Note that the round trip travel time is 2L c : in effect, there is one pulse oscillating back and forth in the laser cavity that is output each time it comes to the output coupler. It was ...
... That is, we obtain a train of Gaussian pulses of width 1/Ωg at a repetition rate of c/2L as shown in Fig. (1d). Note that the round trip travel time is 2L c : in effect, there is one pulse oscillating back and forth in the laser cavity that is output each time it comes to the output coupler. It was ...
chapter 7
... With the scanning electron microscope there is a danger of overheating the surface of observed object. This is because the electron beam does not spread over a wide area instead it is concentrated on a single point on the sample surface! Therefore, the accelerating voltage must not exceed 25 kv. 3. ...
... With the scanning electron microscope there is a danger of overheating the surface of observed object. This is because the electron beam does not spread over a wide area instead it is concentrated on a single point on the sample surface! Therefore, the accelerating voltage must not exceed 25 kv. 3. ...
IEEE J. Quant. Electron. 24, 431 - Department of Physics
... quent modifications [2], was the only available source of the extracted ultraviolet beam. Intracavity frequency douoptical pulses less than 100 fs in duration. Recently sev- bling has been applied previously to synchronously modeeral investigators [3]-[8] have developed new femtosec- locked picoseco ...
... quent modifications [2], was the only available source of the extracted ultraviolet beam. Intracavity frequency douoptical pulses less than 100 fs in duration. Recently sev- bling has been applied previously to synchronously modeeral investigators [3]-[8] have developed new femtosec- locked picoseco ...
How to Use LASCAD Software for LASer Cavity Analysis and Design LAS
... propagation algorithm. For many configurations, end pumped rods for example, this approximation delivers reliable results for the laser mode. ...
... propagation algorithm. For many configurations, end pumped rods for example, this approximation delivers reliable results for the laser mode. ...
Micro Systems Design GmbH presents - LAS-CAD
... propagation algorithm. For many configurations, end pumped rods for example, this approximation delivers reliable results for the laser mode. ...
... propagation algorithm. For many configurations, end pumped rods for example, this approximation delivers reliable results for the laser mode. ...
Experiment 29B
... where the proportionality constant, h = 6.626 x 10-34 J s , was named in his honor. In our everyday activities, we perceive different wavelengths of visible light as an assortment of colors. Any specific wavelength will correspond to only one of these colors, although as a practical matter our eyes ...
... where the proportionality constant, h = 6.626 x 10-34 J s , was named in his honor. In our everyday activities, we perceive different wavelengths of visible light as an assortment of colors. Any specific wavelength will correspond to only one of these colors, although as a practical matter our eyes ...
Stability of quantum-dot excited-state laser - diss.fu
... Ta2O5 and has a reflectivity of <5% for GS emission, suppressing the GS lasing for all operating currents. Below an injection current of J ¼ 190 mA, the device operates as an optical amplifier for GS and ES. Above this threshold, ES lasing occurs. The electroluminescence spectra of the investigated ...
... Ta2O5 and has a reflectivity of <5% for GS emission, suppressing the GS lasing for all operating currents. Below an injection current of J ¼ 190 mA, the device operates as an optical amplifier for GS and ES. Above this threshold, ES lasing occurs. The electroluminescence spectra of the investigated ...
Ultra-cold atoms - University of St Andrews
... the left, the opposite is true. Either way, the atom receives “kicks” opposite to its velocity, or in other words it experiences a damping force: ...
... the left, the opposite is true. Either way, the atom receives “kicks” opposite to its velocity, or in other words it experiences a damping force: ...
Three key regimes of single pulse generation per round trip of all
... pulse generation. Compared to mode-lock lasers based on saturable absorbers this type of lasers has more robust and reliable design and tolerance to power damage. Compared to soliton generation in the anomalous group velocity dispersion (GVD) regime, use of the normal dispersion allows one to achiev ...
... pulse generation. Compared to mode-lock lasers based on saturable absorbers this type of lasers has more robust and reliable design and tolerance to power damage. Compared to soliton generation in the anomalous group velocity dispersion (GVD) regime, use of the normal dispersion allows one to achiev ...
Chapter 6 Experiment 4: Wave Interference
... that waves usually exhibit some periodic or oscillatory nature such as the water level at a particular point on a pond steadily rising and falling as waves pass. For light (electromagnetic radiation) it is the electric and magnetic fields which oscillate in strength and direction. At visible frequen ...
... that waves usually exhibit some periodic or oscillatory nature such as the water level at a particular point on a pond steadily rising and falling as waves pass. For light (electromagnetic radiation) it is the electric and magnetic fields which oscillate in strength and direction. At visible frequen ...
What limits the maximum output power of long-wavelength
... increasing current and temperature, vertical electron leakage becomes the dominating physical mechanism that reduces the QW carriers available for lasing. At maximum output power, vertical leakage amounts to about one third of the total current (Fig. 10). V. DESIGN VARIATION In this final section, s ...
... increasing current and temperature, vertical electron leakage becomes the dominating physical mechanism that reduces the QW carriers available for lasing. At maximum output power, vertical leakage amounts to about one third of the total current (Fig. 10). V. DESIGN VARIATION In this final section, s ...
Ultrafast Lasers Based on Quantum Dot Structures
... Over the past three decades, laser physics has advanced dramatically owing to the efforts of scientists and technologists. Refined laser operation in continuous wave (cw) or quasi-cw (i.e., pumped by current pulses longer than the characteristic times of the laser dynamics) regimes has been accompani ...
... Over the past three decades, laser physics has advanced dramatically owing to the efforts of scientists and technologists. Refined laser operation in continuous wave (cw) or quasi-cw (i.e., pumped by current pulses longer than the characteristic times of the laser dynamics) regimes has been accompani ...
Communicating Research to the General Public
... antisymmetric stretching mode decreases. Consider an analogy of two people in a room. Each person can be put into a good mood if they hear a certain amount of good news. Suppose one of the two hears enough good news for him/her to become rather giddy. If the other person in the room can be made happ ...
... antisymmetric stretching mode decreases. Consider an analogy of two people in a room. Each person can be put into a good mood if they hear a certain amount of good news. Suppose one of the two hears enough good news for him/her to become rather giddy. If the other person in the room can be made happ ...
Laser Hazard Identification Checklist
... Appropriate laser protective eyewear should be used by everyone in the Laser Control Area (or working zone for Class 3R lasers) at all times for Class 3R, 3B and 4 lasers. For UV lasers, gloves, long sleeve laboratory coats and face shields may also be necessary. Class 4 lasers especially are a pote ...
... Appropriate laser protective eyewear should be used by everyone in the Laser Control Area (or working zone for Class 3R lasers) at all times for Class 3R, 3B and 4 lasers. For UV lasers, gloves, long sleeve laboratory coats and face shields may also be necessary. Class 4 lasers especially are a pote ...
Photonic Atoms
... as geometrical orbits. With diffraction stripped away, photons can be thought of as bouncing around inside the particle in well-defined trajectories, confined by total internal reflection—the same phenomenon that makes the surface of a swimming pool look like a mirror when you peer up from under wat ...
... as geometrical orbits. With diffraction stripped away, photons can be thought of as bouncing around inside the particle in well-defined trajectories, confined by total internal reflection—the same phenomenon that makes the surface of a swimming pool look like a mirror when you peer up from under wat ...
0.26-Hz-linewidth ultrastable lasers at 1557 nm
... Fabry-Pérot cavities at room temperature. The fractional frequency instability of each laser system is nearly 8 × 10−16 at 1–30 s averaging time, approaching the thermal noise limit of the reference cavities. A remarkable frequency instability of 1 × 10−15 is achieved on the long time scale of 100–4 ...
... Fabry-Pérot cavities at room temperature. The fractional frequency instability of each laser system is nearly 8 × 10−16 at 1–30 s averaging time, approaching the thermal noise limit of the reference cavities. A remarkable frequency instability of 1 × 10−15 is achieved on the long time scale of 100–4 ...
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.