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Physics

Optical physics and communications

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Displaying 751 - 775 of 874

Wavelength bistability and switching in two-section quantum-dot diode lasers

June 1, 2010
Author(s)
Mingming M. Feng, Kevin L. Silverman, Richard P. Mirin, Steven T. Cundiff
We report lasing wavelength bistability with respect to applied bias on the saturable absorbers in two-section mode-locked quantum dot lasers. We show data from three different devices exhibiting wavelength bistability. All lasers display wavelength

Fast and accurate comb-based spectral analysis of a frequency agile CW laser

May 1, 2010
Author(s)
Fabrizio R. Giorgetta, Ian R. Coddington, Esther Baumann, William C. Swann, Nathan R. Newbury
The time-resolved frequency spectrum of a frequency agile CW laser is measured with a 300υs update rate and 3 kHz resolution/accuracy over a 28 nm wavelength range with a coherent dual comb setup.

Strategic Plan 2010

April 21, 2010
Author(s)
Gerald T. Fraser
The Optical Technology Division s 2010 Strategic Plan defines the Mission, Vision, and Strategic Elements for the Division. The Strategic Elements consist of Optical Radiation Standards, Optical Measurement Methods, and Optical Measurement Services. The

Shaping Arbitrary Nondiffracting Beams

April 15, 2010
Author(s)
Carlos Lopez-Mariscal, Kristian Helmerson
We present a novel beam shaping method to generate nondiffracting beams with a specific transverse shape. By tailoring the angular spectrum of a Helmholtz-Gauss beam using an iterative Fourier transform algorithm, we produce beams with a specific intensity

Effect of Bandwidth and Numerical Aperture in Optical Scatterometry

March 1, 2010
Author(s)
Thomas A. Germer, Heather J. Patrick
We consider the effects of finite spectral bandwidth and numerical aperture in scatterometry measurements and discuss efficient integration methods based upon Gaussian quadrature in one dimension (for spectral bandwidth averaging) and two dimensions inside

Molecular spectroscopy with frequency combs

March 1, 2010
Author(s)
Ian R. Coddington
Pulsed femtosecond frequency combs are rapidly developing as a powerful spectroscopic tool. As a spectroscopic source stabilized frequency combs potentially offer broad spectral coverage, near perfect frequency accuracy, low timing jitter and broadband

Sensitivity Comparison of Mx and Frequency Modulated Bell-Bloom Cs Magnetometers in a Micro-Fabricated Cell

February 1, 2010
Author(s)
Ricardo Jimenez Martinez, William C. Griffith, Ying-ju Wang, Svenja A. Knappe, John E. Kitching, Ken Smith, Mark Prouty
We compare the sensitivity performance of two optically pumped atomic magnetometers based on the Mx and frequency-modulated Bell-Bloom configurations. The Cs magnetometers are implemented using a millimeter-scale microfabricated vapor cell in a

Infrared time domain spectroscopy with synchronized frequency combs

January 29, 2010
Author(s)
Nathan R. Newbury, Ian R. Coddington, William C. Swann
We describe a frequency-comb based system for time-domain spectroscopy in the near infrared. Our configuration implements synchronous, repetitive sampling of the time domain signature for real-time coherent signal averaging and improved signal-to-noise

Linewidth narrowing and Purcell enhancement in photonic crystal cavities on an Er-doped silicon nitride platform

January 25, 2010
Author(s)
Yiyang Gong, Maria Makarova, Selcuk Yerci, Rui Li, Martin Stevens, Burm Baek, Sae Woo Nam, Robert Hadfield, Sander N. Dorenbos, Val Zwiller, Luca Dal Negro, Jelena Vuckovic
Light emission at 1.54 mm from an Er-doped amorphous silicon nitride layer coupled to photonic crystal resonators at cryogenic and room temperatures and under varying optical pump powers has been studied. The results demonstrate that small mode volume

Polarized Optical Scattering Signatures from Biological Materials

January 11, 2010
Author(s)
W. E. Martin, E. Hesse, J. H. Hough, William Sparks, C. S. Cockell, Z. Ulanowski, Thomas Germer, B. Kaye
The polarization of laser light backscattered from biological samples has been measured over the wavelength range 350 to 850nm. Incident circular, linearly polarized, and unpolarized light produces significant spectrally prominent scattered polarizations

Progress Toward Corrugated Feed Horn Arrays in Silicon

December 16, 2009
Author(s)
Joseph W. Britton, Ki W. Yoon, James A. Beall, Daniel T. Becker, Hsiao-Mei Cho, Gene C. Hilton, Michael D. Niemack, Kent D. Irwin
We are developing monolithic arrays of corrugated feed horns fabricated in silicon for dual-polarization single mode operation at 90, 145 and 220 GHz. The arrays consist of hundreds of platelet feed horns assembled from gold coated stacks of micromachined

Quasi-phasematched Second Harmonic Generation in GaAs Microdisks

November 15, 2009
Author(s)
Paulina S. Kuo, W Fang, Glenn S. Solomon
We discuss design and tuning of second-harmonic generation in GaAs microdisks. Quasi-phasematching can be achieved in the microdisk geometry without external domain inversions, but efficient nonlinear optical mixing requires that all waves be resonant

Optical frequency stabilization of a 10 GHz Ti:sapphire frequency comb by saturated absorption spectroscopy in 87Rubidium

November 4, 2009
Author(s)
Dirk Heinecke, Albrecht Bartels, Tara M. Fortier, Danielle Braje, Leo Hollberg, Scott A. Diddams
The high power per mode of a recently-developed 10 GHz femtosecond Ti:sapphire frequency comb permits nonlinear Doppler-free saturation spectroscopy in 87Rubidium with a single mode of the comb. We use this access to the natural linewidth of the Rubidium

Preparation of Dicke States in an Ion Chain

November 2, 2009
Author(s)
David Hume, Chin-Wen Chou, Till P. Rosenband, David J. Wineland
We have investigated theoretically and experimentally a method for preparing Dicke states in trapped atomic ions. We consider a linear chain of N ion qubits that is prepared in a particular Fock state of motion, jmi. The m phonons are removed by applying a
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