Prof. Rufus L. Cone Profile

Prof. Rufus L. Cone

Professor of Physics at Montana State Univ

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Publications (4)

Proceedings Article | 24 February 2012 Paper

Rare-earth-doped materials with application to optical signal processing, quantum information science, and medical imaging technology

R. Cone, C. Thiel, Y. Sun, Thomas Böttger, R. Macfarlane

Proceedings Volume 8272, 82720E (2012) https://doi.org/10.1117/12.909154

KEYWORDS: Optical filters, Laser stabilization, Crystals, Ions, Ultrasound-modulated optical tomography, Absorption, Solids, Electronics, Holography, Hole burning spectroscopy

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Proceedings Article | 15 February 2010 Paper

Maximum coherence in optical transitions in rare-earth-ion-activated solids

Aleks Rebane, Charles Thiel, R. Krishna Mohan, Rufus Cone

Proceedings Volume 7611, 76110H (2010) https://doi.org/10.1117/12.848879

KEYWORDS: Ions, Crystals, Solids, Absorption, Coherence (optics), Oscillators, Diffusion, Magnetism, Quantum information, Phonons

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Proceedings Article | 1 July 2003 Paper

Material optimization of Er3+:Y2SiO5 at 1.5 um for optical processing, memory, and laser frequency stabilization applications

Thomas Boettger, Yongchen Sun, Charles Thiel, Rufus Cone

Proceedings Volume 4988, (2003) https://doi.org/10.1117/12.474784

KEYWORDS: Erbium, Magnetism, Diffusion, Crystals, Ions, Absorption, Laser stabilization, Signal processing, Hole burning spectroscopy, Spectroscopy

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Spatial-spectral holography using spectral hole burning materials is a powerful technique for performing real-time, wide-bandwidth information storage and signal processing. For operation in the important 1.5 μm communication band, the material Er³⁺:Y₂SiO₅ enables applications such as laser frequency stabilization, all-optical correlators, analog signal processing, and data storage. Site-selective absorption and emission spectroscopy identified spectral hole burning transitions and excited state T₁ lifetimes in the 1.5 μm spectral region. The effects of crystal temperature, Er³⁺-dopant concentration, magnetic field strength, and crystal orientation on spectral diffusion were explored using stimulated photon echo spectroscopy, which is the "prototype" interaction mechanism for device applications. The performance of Er³⁺:Y₂SiO₅ and related Er³⁺ materials has been dramatically enhanced by reducing the effect of spectral diffusion on the coherence lifetime T₂ through fundamental material design coupled with the application of an external magnetic field oriented along specific directions. A preferred magnetic field orientation that maximized T₂ by minimizing the effects of spectral diffusion was determined using the results of angle-dependent Zeeman spectroscopy. The observed linewidth broadening due to spectral diffusion was successfully modeled by considering the effect of one-phonon (direct) processes on Er³⁺ - Er³⁺ interactions. The reported studies improved our understanding of Er³⁺ materials, explored the range of conditions and material parameters required to optimize performance for specific applications, and enabled measurement of the narrowest optical resonance ever observed in a solid-with a homogeneous linewidth of 73 Hz. With the optimized materials and operating conditions, photon echoes were observed up to temperatures of 5 K, enabling 0.5 GHz bandwidth optical signal processing at 4.2 K and providing the possibility for operation with a closed-cycle cryocooler.

Proceedings Article | 9 July 2001 Paper

Semiconductor lasers stabilized to spectral holes in rare-earth crystals

Rufus Cone, Thomas Boettger, G. Pryde, N. Strickland, Yongchen Sun, Peter Sellin, John Carlsten

Proceedings Volume 4283, (2001) https://doi.org/10.1117/12.432583

KEYWORDS: Hole burning spectroscopy, Laser stabilization, Ions, Crystals, Thulium, Semiconductor lasers, Erbium, Absorption, Laser crystals, YAG lasers

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