Bae Systems Information and Electronic Systems Integration Inc.

Other

Apti Inc.

Konstantinos Papadopoulos

Idan Mandelbaum

Louise C Sengupta

Arie Zigler

Arie Ziegler

A laser system includes first and second mirrors, a semiconductor laser and a high frequency pulse generator. The semiconductor laser generates optical power within an optical cavity and reflects the optical power between the first mirror and second mirrors. The optical power has a frequency of f. The high frequency pulse generator generates a high frequency pulse with a rise time greater than an optical cycle of the optical power within the optical cavity and directly impinges the high frequency pulse on the optical power within the optical cavity. Impinging the high frequency pulse on the optical power within the optical cavity causes a frequency shift of the optical power to generate a final laser frequency that is greater than fas well as beyond a frequency band of the second mirror to cause a final laser to be emitted past the second mirror and from the semiconductor laser.

Ultra fast semiconductor laser

A system and method for reducing energetic proton flux trapped in the inner radiation belt by injecting Ultra Low Frequency (ULF) electromagnetic waves is disclosed. The ULF electromagnetic waves is generated by space or ground based transmitters and the frequency range is selected such that the injected waves are in gyrofrequency resonance with trapped 10 to 100 Mev protons. Pitch angle scattering of the trapped protons in gyro-resonance with the injected waves increases their precipitation rate by forcing their orbits into pitch angles inside the atmospheric loss-cone where they are lost by intaracting with the dense neutral atmosphere at altitudes below 100 km. The reduction of energetic proton flux trapped in the inner radiation belt allows use of commercial electronics with submicron feature size on Low Earth Orbit satellites and microsatellites without the operational constraints imposed by the presence of energetic proton fluxes trapped at the inner radiation belts.

System and method for reducing trapped energetic proton flux at low earth orbits

A system and method for improving the survivability of space systems following a High Altitude Nuclear Explosion (HANE) incident resulting in energetic electrons being trapped in the inner radiation belt of Earth is disclosed. The ULF electromagnetic waves is generated by space or ground based transmitters and the frequency range is selected such that the injected waves are in gyrofrequency resonance with trapped energetic particles. The Radiation Belt Remediation (RBR) depends on the wave-number of the injected waves and the wave-number of the injected waves increases along their propagation path when they approach the cyclotron frequency of the dominant or minority ions 0, Heand H.

System and method for reducing trapped energetic proton or energetic electron flux at low earth orbits

A radiation-protection device is provided that includes a substrate and a surface structure formed on the substrate. The surface structure has an arrangement and interacts with radiation and the substrate to at least (a) substantially transmit or attenuate radiation at a wavelength and an energy below a threshold energy, and (b) substantially reflect radiation at the wavelength and an energy above the threshold energy.

Radiation-protection device

A method for generating electromagnetic waves in the ELF/ULF comprising the steps of using a ground-based Horizontal Electric Dipole (HED) antenna to send electromagnetic pulses upwardly in the E-region of the ionosphere to form an oscillatory or pulsed electric field; allowing said pulsed electric field to interact with magnetized plasma of the lower ionosphere to generate a pulsed horizontal and vertical current which have associated Horizontal and Vertical Electric Dipole moment; and allowing them to radiate.

Method and apparatus for establishing low frequency/ultra low frequency and very low frequency communications

A strong magnetic field is applied to a photoconductive semiconductor switch to make the opening time of the switch independent of the recombination time of the photoionized semiconductor. As a result, the switch is capable of shaping current pulses with the fidelity of an illuminating optical pulse used to activate the switch. The strong magnetic field applied to the photoconductive semiconductor switch has a strength satisfying the relationship .mu.B&gt;1, where .mu. is the mobility of the semiconductor (in m.sup.2 /Volt Sec) and B the magnetic field (in Tesla). Such a switch acts as an insulator (magnetic insulation) to an applied electric field except during the time that the light incident thereon generates electron-hole pairs. During that time, a polarization current, proportional to the externally induced pair production rate, flows and the magnetic insulation is broken. The minimal system response time is controlled by the gyrofrequency of the carriers. The response time is shorter than one picosecond for materials with small carrier effective mass and magnetic fields of one Tesla.

Magnetized photoconductive semiconductor switch

An apparatus and method for performing geological mapping utilizes an HF transmitter to heat ionospheric electrons to cause the current in an overhead electrojet to be modulated, thereby injected a low frequency EM signal into the Earth-ionosphere waveguide. A sensor measures vector values of electric and magnetic fields in an area to be surveyed. The measured vector values are provided to a processor that creates a conductivity map of the surveyed area based on the measured vector values.

Growing community of inventors

Chevy Chase, MD, United States of America

Konstantinos Papadopoulos