S2 Corporation

Montana State University

The Research and Development Intstitute

Peter B Sellin

Alex Woidtke

Luke Mauritsen

David Snow

Rufus Cone

John L Carlsten

Calvin Harrington

Charles W Thiel

Michael Chase

Kris Merkel

Nicholas M Strickland

Zeb William Barber

Krishna Rupavatharam

Kristian D Merkel

Isaac Henslee

Craig Benko

Techniques for generating an arbitrary target electromagnetic signal with a nonlinear material, include determining a time varying target amplitude and target phase and an order n of a nonlinear material. For each time, a first set of nth roots of the target amplitude and a second set of nth roots of the target phase are determined. An input amplitude based on one value from the first set and an input phase based on one value from the second set is determined at each time. A difference between temporally successive values of phase is minimized. An electromagnetic signal is modulated to impose the input amplitude and phase to produce a modulated electromagnetic input signal that is introduced into the nonlinear material to produce a target electromagnetic signal.

Techniques for using nonlinear electromagnetic materials to produce arbitrary electromagnetic signals

A sample mounting apparatus for a cryo-cooler is provided having a housing with an outer wall surface for connecting to the cryo-cooler, and an inner wall surface. An inert gas is sealed inside the housing for thermal transfer, and a delicate mount is attached to the inner wall surface of the housing for supporting the sample and substantially preventing vibrations from being transferred to the sample from the cryo-cooler.

Vibration reducing sample mount with thermal coupling

A cryogenic apparatus is provided having a nested thermally insulating structure, thermal links, a vacuum shroud, and a cryo-cooler. The nested thermally insulated structure holds a sample to be cooled while dampening the external vibrations caused by the cryo-cooler, the surrounding environment or cryo-cooler mounting surface. The thermal link is made of thermally conductive wires which connect the nested thermally insulated structure and the cryo-cooler thereby allowing the apparatus to reduce vibrations inherent in the operation of the cryo-cooler.

Apparatus and methods for improving vibration isolation, thermal dampening, and optical access in cryogenic refrigerators

A method and apparatus for producing an arbitrary broadband waveform includes generating a first narrowband waveform and generating a frequency-shifted replica by frequency shifting the first narrowband waveform by a frequency shift. A second narrowband waveform is also generated. A broadband waveform is generated by combining the frequency-shifted replica and the second narrowband waveform.

Methods and apparatus for photonic arbitrary waveform generation over wide-bandwidth and extended time apertures

A cryogenic apparatus is provided having a nested thermally insulating structure, thermal links, a vacuum shroud, and a cryo-cooler. The nested thermally insulated structure holds a sample to be cooled while dampening the external vibrations caused by the cryo-cooler, the surrounding environment or cryo-cooler mounting surface. A vacuum plate is removably attached to the vacuum shroud to provide access to the sample chamber.

A method of rotating a sample for use in a cryocooler, having the steps of mounting a sample in a sample mounting apparatus, the apparatus comprising a housing having an outer wall surface, an inner wall surface, a mount attached to the inner wall surface for supporting the sample, and a motor for rotating the sample, and an exchange gas to provide thermal communication between the moving sample and the inner housing surfaces; sealing the housing by applying a sealant to adjoining parts of the housing such that the joints are air tight; evacuating the housing; adding an inert gas to the housing; sealing the inert gas in the housing; attaching the outer wall surface of the housing to a cryocooler; and rotating the sample by engaging the motor. Also disclosed is a cryogenic apparatus having a sample holder; a cryo-cooler; a thermal link connecting the sample holder and the cryo-cooler; and a motor attached to the sample holder for rotating a sample.

Methods and apparatus for providing rotational movement and thermal stability to a cooled sample

Laser frequency stabilizer using transient spectral hole burning

Techniques for stabilizing a laser ( ) at a selectable frequency include splitting an output beam from an electrically adjustable laser into a first beam ( ) and a second beam ( ). The second beam is transmitted through a modulator ( ). Then the second beam is transmitted through a spectral hole burning material ( ) onto a detector ( ). The laser is electronically adjusted in response to a detector output from the detector which senses the changes in the modulated second beam after it passes through the spectral hole burning material.

Growing community of inventors

Bozeman, MT, United States of America

Peter B Sellin