Powder atomic layer deposition process is used to coat nanopowders of host materials (e.g. yttrium aluminum garnet) with optically active neodymium organometal precursor followed by O2/O3 RF plasma to convert to a single layer of Nd2O3. The process can be repeated to build arbitrarily thick layers with custom doping profiles and followed by post-…
Keywords
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- Compact Space Telescopes (5)
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Technology Portfolios
![Electronic Wave](/sites/default/files/styles/scale_exact_400x400_/public/2022-06/electronic%20wave.jpg?itok=v7aKMJKH)
This invention works by imaging an ultrafast pulse diffracted from a large grating onto a spatial light modulator (SLM) thereby directly transcribing an arbitrary record on a pulse front tilted (PFT) ultrafast pulse. The grating generates PFT of the input pulse, and the SLM provides temporal control of the pulse through the space-to-time mapping of the tilted pulse. Coupling this patterned…
![Electronic Wave](/sites/default/files/styles/scale_exact_400x400_/public/2022-06/electronic%20wave.jpg?itok=v7aKMJKH)
This invention exploits the non-linearities of optical Mach-Zehnder (MZ) electrooptic modulators to enhance small signal dynamic range at higher bandwidths. A linear photodiode (PD) converts the amplified optical signal output from the MZ back to an electrical signal completing an Electrical-Optical-Electrical (EOE) conversion cycle. The dynamic range can be further enhanced by daisy chaining…
![Laser peening induces deep compressive stress, which significantly extends the service lifetime over any conventional treatment](/sites/default/files/styles/scale_exact_400x400_/public/2024-02/laser%20peening%20inducing%20deep%20compressive%20stress.png?itok=oMzDBpkP)
This invention proposes using a pulse laser configured to generate laser pulses and a controller for controlling operation of the pulse laser. The controller is further configured to control the pulse laser to cause the pulse laser to generate at least one of the laser pulses with a spatiotemporally varying laser fluence over a duration of at least one of the laser pulses. The spatiotemporally…
![Adobe Stock image laser beam](/sites/default/files/styles/scale_exact_400x400_/public/2024-02/stockimage_laserbeam.png?itok=U06HtIhR)
This invention proposes to engineer the current density along the length of a laser diode to overcome the penalty associated with non-uniformity resulting from asymmetry in the gain, photon or carrier density despite having uniform contact. Optimizing the current density profile enables diode lasers to operate with greater power conversion efficiency or operate with equivalent power conversion…
![Schematic showing mismatched coefficient of thermal expansion (CTE) coating](/sites/default/files/styles/scale_exact_400x400_/public/2024-02/IL-13312_Schematic.png?itok=5MN8Mf-U)
This invention proposes to engineer the temperature dependence of the emission wavelength of LEDs and laser diodes. The approach is to use a strain-inducing coating to counteract the intrinsic temperature coefficient of the emission wavelength of the LED or laser diode device thereby rendering it athermal. This invention avoids additional complexity, size, weight and power dissipation of…
![Photoconductive Semiconductor Laser Diodes and LEDs](/sites/default/files/styles/scale_exact_400x400_/public/2024-02/Photoconductive%20Semiconductor%20Laser%20Diodes%20and%20LEDs.png?itok=n50p3rOY)
This invention proposes a method to overcome the key limitation of electrically pumped lasers based on AlN, AlGaN, or AlInGaN, namely the lack of suitable shallow donor and acceptor dopants. As the band gap of these materials increases (and the emission wavelength decreases), both electrons and holes require greater thermal energies in order to ionize.
![Adobe Stock image laser beam](/sites/default/files/styles/scale_exact_400x400_/public/2024-02/stockimage_laserbeam.png?itok=U06HtIhR)
Laser diode lensing effect can be substantially reduced by creating a pattern interface such that the substrate is only attached at the diode mesa. This is achieved by either creating a pattern solder joint and/or pattern substrate.
![large potassium dihydrogen phosphate KDP crystal](/sites/default/files/styles/scale_exact_400x400_/public/2024-01/KDP%20crystal.png?itok=K36reu5O)
This invention takes advantage of the high water-solubility of key NIF KDP crystal optics and uses water as an etchant to remove surface defects and improve the laser induced damage threshold. Since pure water etches KDP too fast, this invention is to disperse water as nanosized droplets in a water-in-oil micro-emulsion. While in a stable micro-emulsion form, the surfactant additives prevent…
This invention proposes to use laser induced melting/softening to locally reshape the form of a glass optic. The local glass densification that results induces predictable stresses that through plate deformation mechanics yield a deterministic methodology for arbitrarily reshaping an optic surface figure and wavefront without the need to remove material.
![HAPLS](/sites/default/files/styles/scale_exact_400x400_/public/2019-09/High-Repetition-Rate%20Advanced%20Petawatt%20Laser%20System.jpg?itok=T6tyQfDN)
LLNL researchers have developed a high average power Faraday rotator that is gas-cooled and uniquely designed to dissipate heat uniformly so that it does not build up in the optical component and affect its performance. The Faraday rotator material is sliced into smaller disks like a loaf of bread so that high speed helium gas can flow between the slices. With this highly efficient cooling…
![The High-Repetition-Rate Advanced Petawatt Laser System (HAPLS), the world’s most advanced and highest average power diode-pumped petawatt laser system, at LLNL.](/sites/default/files/styles/scale_exact_400x400_/public/2023-05/HAPLS.jpg?itok=k06DgZFt)
This invention discloses a method to minimize transient variations in the wavelength- and/or pointing-behavior of an optic, without requiring a reduction in its thermal resistance, optical absorption, or operating irradiance. The invention employs a combination of a time-varying heat source and time-varying thermal resistance and/or heat sink temperature to achieve temperature stability of the…
![NIF Target Chamber](/sites/default/files/styles/scale_exact_400x400_/public/2023-05/NIF%20Target%20Chamber.jpg?itok=7tM0wDWR)
This invention concerns a new type of optic: a transient gas or plasma volume grating produced indirectly by small secondary lasers or directly by nonlinear processes using the primary beams themselves. When used in conjunction with advantageously placed shielding it offers a means of protecting the final optical components of a high-repetition-rate IFE facility. These transmission optics are…
![Radio Frequency Photonics Optimizes Signal Processing](/sites/default/files/styles/scale_exact_400x400_/public/2023-05/Radio%20Frequency%20Photonics.png?itok=jqMPKpXD)
LLNL researchers in the NIF Directorate DoD Technologies RF Photonics Group explored phase modulation solutions to this signal processing challenge. Optical frequency combs offer phase noise characteristics that are orders of magnitude lower than available from commercial microwave references. The Photonics Group researchers recognized that by converting the intensity information into phase,…
![creation of ultra-high energy density matter by an intense laser pulse](/sites/default/files/styles/scale_exact_400x400_/public/2022-06/laser_update875.jpg?itok=793sEzmU)
![Hand polishing optics](/sites/default/files/styles/scale_exact_400x400_/public/2022-06/Hand%20polishing%20optics.jpg?itok=wMDpDXGd)
LLNL's Slurry Stabilization Method provides a chemical means of stabilizing a polishing compound in suspension at working concentrations without reducing the rate of material removal. The treated product remains stable for many months in storage.
![Laser Peening](/sites/default/files/styles/scale_exact_400x400_/public/2022-06/Laser%20peening.jpg?itok=l2OKtGme)
LLNL’s system consists of one or more flashlamp-pumped Nd:glass zig-zag amplifiers, a very low threshold stimulated-Brillouin-scattering (SBS) phase conjugator system, and a free-running single frequency Nd:YLF master oscillator.
![nuclear reactor](/sites/default/files/styles/scale_exact_400x400_/public/2022-06/nuclear%20reactor.jpg?itok=RMgGfrZv)
The new LLNL technique works by transiently removing and trapping concrete or rock surface material, so that contaminants are confined in a manner that is easy to isolate and remove. Our studies suggest that 10 m2 of surface could be processed per hour. The technique easily scales to more surface/hr.