Time-Resolved Optical Spectroscopy Optical spectroscopy is a versatile experimental tool for studying the long-wavelength behavior of condensed matter systems. The relevant measured quantity is the current-current correlation function, encoded in the complex dielectric function. When performed with ultrafast lasers, optical spectroscopy can reveal key features of the emergent electronic dynamics following a strong laser excitation. We are particularly interested in the low-energy dynamics of materials, roughly located in the midinfrared/THz region of the electromagnetic spectrum, and in the possibility of using strong THz pulses to manipulate electronic degrees of freedom in quantum materials. Our group has a vast expertise in using ultrafast light pulses to tailor material properties and we are strongly interested in developing THz-pump/THz probe experiments, as well as performing 2D THz spectroscopy. on quantum materials. In a THz pump-THz probe experiment, a sample is excited by the pump (red) and probed by a reflected or transmitted probe field (blue). The complex transient optical response is measured with phase sensitivity by THz electro-optic sampling (EOS) and as function of pump-probe (PP) delay. https://mitrano.physics.harvard.edu/research/techniques

EO crystals to study THz-driven quantum materials (Mott insulators, strongly correlated metals, and superconductors)
https://www.youtube.com/watch?v=nmkEny5QQ2Y

Z-cut Quartz vacuum viewports and windows transmits far infrared and terahertz radiation sales@dmphotonics.com Del Mar Photonics offer a range of competitively priced UHV viewports, Conflat, ISO or KF including a variety of coatings to enhance performance. When you send us your inquiry please fill out the following form to indicate all important specifications and e-mail it to us with your inquiry. http://www.dmphotonics.com/Zinc-selenide-ZnSe-vacuum-viewport/vacuum-viewports-ZnSe.htm Del Mar Photonics viewports are manufactured using advanced techniques for control of special and critical processes, including 100 percent helium leak testing and x-ray measurements for metallization control. Crystal quartz is a very useful material because of its high UV, VIS and NIR transmittance, birefringence, ability to rotate plane polarized light, high damage threshold and resistance to scratching. The optical grade material is featured by highest possible transmittance throughout range 190 – 2900 nm, virtual freedom from bubbles and inclusions, conformity with Military striae Grade A. Featured customer: A user facility for the advancement of laser and accelerator physics The Accelerator Test Facility provides experimenters with the equipment necessary for the advancement of accelerator technologies, with a view to develop smaller machines and more cost-effective methods of particle acceleration. The ATF provides a very high brightness electron beam to four beam lines, synchronized with high-power lasers. The electrons are produced by a photoinjector, whose photocathode is illuminated by a frequency quadrupled solid-state laser. Two S-band linear accelerator sections accelerate the electrons. The beam can be manipulated in the transport line to deliver it to one of several targets in the experimental hall. There are more than 40 quadrupoles along four transport lines to tailor the beam to particular experiments. More than 50 high-resolution profile monitors measure the beam’s particle distribution. Plasma Wakefield Acceleration is a method for accelerating particle beams over much shorter distances than traditional accelerators. An electron bunch travelling through a plasma creates wakefields through which subsequent electron bunches may be accelerated at a high gradient. This technique produces more compact, more energy-efficient high-energy particle beams. Medical Imaging. Interaction of the ATF electron beam with the CO2 laser is a viable source of fast x-rays with wavelengths on the scale of pico- or femtoseconds. These x-rays have uses in ultrafast imaging, positron production, and many other applications. Ion Generation. MeV proton beams generated by CO2 laser pulses focused on a hydrogen gas jet have potential uses in positron emission tomography and hadron cancer therapy. A time-resolved optical diagnostic provides new insight into the physics of laser-plasma interactions at supercritical densities. Research Opportunities There are numerous research opportunities for post-doctoral fellows at the ATF. These include work on laser-photocathode RF guns, various laser accelerator and FEL experiments, high power laser development (e.g. our unique compact CO2 terawatt laser) and more. If you have a postdoctoral fellowship and you are looking for an exciting place to work, contact the ATF for more details. The ATF also occasionally provides research assistantships for qualified Ph.D. students. PHYSICS AND APPLICATIONS OF HIGH BRIGHTNESS BEAMS: TOWARDS A FIFTH GENERATION LIGHT SOURCE Energy Measurement at Exit of rf Photoinjector Electron energy at the exit of rf photoinjector is measured by the following two steps. First, an electron pulse is kicked by a trim coil inside the photoinjector and the electron position at the exit of the photoinjector is observed. Next, the measured position is put into a MAD input file and the electron energy is fitted by MAD. Since the two coils are partially overlapped, the coils are independently divided into tens of slices and each slice is placed reciprocally. Longitudinal Beam Profile Measurements In order to measure longitudinal beam profile is used coherent transition radiation from the electron beam. ATF has interferometer, Golay cell and bolometer to measure the longitudinal profile. z-cut quartz windows z cut quartz definition z cut quartz rotator
https://www.youtube.com/watch?v=1hE4oykpZ-8

Getting ready for SPIE Defense + Commercial Sensing – request a quote for lasers or optical components for defense and commercial sensing applications at sales@dmphotonics.com

Germanium windows polished and coated for thermovision and thermography applications – see details below sales@dmphotonics.com Lasers for defense and commercial sensing applications – sales@dmphotonics.com – see details below.
Germanium windows and lenses for IR infrared thermography – sales@dmphotonics.com Germanium windows and lenses Germanium lenses (Ge lenses) is commonly used in IR imaging systems typically operating in the 2 µm to 16 µm spectral range, covers the LWIR (8-12μm) and MWIR (3-5μm) thermal imaging applications. Gerrmanium has the highest refractive index of commonly available IR-transmitters and has low optical dispersion. This makes it desirable in aspects of lens design where its refractive index allows otherwise impossible specifications to be built. Germanium can be AR coated with Diamond producing an extremely tough front optic, and it is often used as the front optics in lens group. Germanium is more rugged than other IR materials, but caution should be taken for high temperature applications where the material will become opaque in the IR realm as the temperature rises. Beside the general spherical surface lenses, we also provide the aspherical surface lenses made by SPDT (Single Point Diamond Turning) technique. Diameter range: ~ 300mm Long wavelength range from 2 to 16 micro Fit for both MWIR (3-5 micro) and LWIR (8-12 micro) thermal imaging applications All types of lenses: plano-convex, plano-concave, double convex, double concave and meniscus With spherical and aspherical lens surface Various types of coating available: AR/AR@7-14um DLC (diamond or hard carbon coating)/AR@7-14um BBAR/BBAR@3-12um Customized coating Specifications Materials – Optical grade germanium single crystals Diameter range ~300mm Diameter Tolerance -0.01/-0.03mm Thickness Tolerance +/-0.03mm Surface Quality 60/40 S/D Fringes (N) – 3 Irregularity (delta N) -1 Centration – 3′ Chamfer – 0.1-0.3mmx45 degree Coatings AR/AR@7-14micro DLC/AR@7-14micro BBAR/BBAR@3-12 micro For coating curves – email to sales@dmphotonics.com Germanium (Ge) is a relatively hard, high-density, IR transmitting material that blocks UV and VIS wavelengths but allows IR from 2µm. Germanium has the highest refractive index of commonly available IR-transmitters and has low optical dispersion. This makes it desirable in aspects of lens design where its refractive index allows otherwise impossible specifications to be built. AR coating is recommended. Typical applications for Germanium include thermal imaging where the material can be used as a front optic while its index of refraction makes Germanium useful for wide-angle lenses and microscopes. Additionally, Germanium components can be used for FLIR (Forward Looking Infrared) and FTIR (Fourier Transformed Infrared) spectroscopy systems, alongside other analytical instruments. In order to lower the cost and improve the imaging quality of les assemblies used in thermal imaging cameras, the aspherical surfaces is used in the design of lens group. We provide the spherical surface lenses made by SPDT (Single Point Diamond Turning) technique. =================================

Del Mar Photonics can offer complete solutions in a wide range of defense and commercial sensing applications as well as for scientific research, biomedicine, and environmental sciences to industrial materials processing, microelectronics, avionics, and entertainment. Laser Optogenetics & Neuroscience Laser Alignment PIV: Particle Image Velocimetry Laser Scanning Confocal Laser Scanning Microscopy Wafer Inspection Raman Spectrum Solution Underwater Imaging & Surveying LIF: Laser Induced Fluorescence Medical & Chemical Devices LIBS: Laser Induced Breakdown Nondestructive Testing Devices Up-conversion Luminescence High Resolution Display Holography DNA Sequencing Fluorescence excitation Imaging for PCB Flow Cytometry Laser Processing Optical Communication and Imaging Laser Printing Industry and Laser coating Ranging and Lidar Optical Data Storage Diamond Micro Marking Machine Microlaser for Diamond Planning Laser Medical therapy Architectural Tools Laser Heating
https://www.youtube.com/watch?v=_tNrpTF4mTo

Are you planning to attend Photonics West? Hope so – 10 years of the Startup Challenge! – can you believe it?

The press release and team list is out for the Startup Challenge:

https://spie.org/news/2020-spie-startup-challenge-semi-finalists-highlight-transformational-photonics-innovations?SSO=1

https://spie.org/industry-resources/industry-events/spie-startup-challenge/2020-semi-finalists?SSO=1

Egorov Scientific product portfolio includes ultrafast laser oscillators and amplifiers, pulse pickers, autocorrelators, and a femtosecond dynamics tools such as Beacon fluorescence upconversion and Hatteras transient spectroscopy pump-probe.

Featured – a variety of Terahertz crystals, components and systems, including ZnTe, GaP, GaSe, MgO:LiNbO3, THz vacuum viewports, THz high power sources. For more information, visit http://www.egorovscientific.com

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