Results 81 to 90 of about 349,357 (303)

Reduction of optical phase noise in semiconductor lasers

Electronics Letters, 1982
There are several applications of highly coherent semiconductor lasers, especially in coherent optical-fibre communications systems and optical-fibre sensors. Optical phase noise is extremely important in these applications. Here we report preliminary results from a simple technique whereby phase noise in semiconductor lasers may be reduced.
K.W. Cobb, B. Culshaw
openaire   +1 more source

Creating Ti–Fe α/β Alloys by Diffusion‐Driven Solid‐State Processing

Advanced Engineering Materials, EarlyView.
This study proposes making alloys containing fast diffusing elements that are difficult to produce by ingot metallurgy, by diffusion‐driven solid‐state HIP processing of elemental powders and low‐temperature homogenisation. Here, novel Fe‐Ti α–β alloys are formed having fine α–β lamellae, a small β prior grain size without significant intermetallics ...
Jiaqi Xu, Xun Zhang, Jack M. Donoghue, Albert D. Smith, Rahul Unnikrishnan, Rhys Thomas, Vahid Nekouie, Jie Luo, Dongchen Hu, Michael Preuss, Philip J. Withers   +10 more
wiley   +1 more source

Viterbi-Viterbi Carrier Phase Estimation for Multi-Ring $M$-APSK With Wiener Carrier Phase Noise and Its Performance

IEEE Photonics Journal
High-order modulations are currently widely used in optical communications to increase the data rate. However, due to the existence of laser phase noise, the performance of high-order modulated systems will be greatly degraded.
Qian Wang, Wenqiang Ma, Li Ping Qian, Xinwei Du, Changyuan Yu, Pooi-Yuen Kam   +5 more
doaj   +1 more source

Noise Characteristics of semiconductor Laser with Phase- Conjugate Feedback [PDF]

مجلة التربية والعلم, 2005
Noise spectra of semiconductor laser subject to a phase-conjugate feedback were investigated theoretically. Time-delayed rate equations with feedback were solved and characteristic equations for relative intensity noise and frequency noise spectra were ...
M.I. Azawe
doaj   +1 more source

Noise and aliases in off-axis and phase-shifting holography [PDF]

, 2008
We have compared the respective efficiencies of off-axis and phase-shifting holography in terms of noise and aliases removal. The comparison is made by analyzing holograms of an USAF target backlit with laser illumination, recorded with a charge-coupled ...
Ansari, Colomb, Creath, Cuche, Cuche, Gabor, Goodmann, Gross, Guo, Kato, Kreis, LeClerc, Leith, Marquet, Massatsch, Massig, Nomura, Pu, Schnars, Schnars, Tamano, Yamaguchi, Yamaguchi, Yamaguchi, Yamaguchi, Zhang, Zhang   +26 more
core   +2 more sources

Laser Phase-Noise Cancellation in Chirped-Pulse Distributed Acoustic Sensors [PDF]

Journal of Lightwave Technology, 2018
European ...
Fernández Ruiz, María del Rosario, Pastor Graells, Juan, Fidalgo Martins, Hugo, García Ruiz, Andrés, Martín López, Sonia, González Herráez, Miguel   +5 more
openaire   +2 more sources

High‐Temperature Nanoindentation of Metals: Assessing Thermal Drift, Frame Compliance, and Chemical Composition Effects on the Reported Mechanical Properties

Advanced Engineering Materials, EarlyView.
Do not let thermal drift and instrument artifacts deceive high‐temperature nanoindentation results. We compare classical Oliver–Pharr and automatic image recognition analyses across steels and a Ni alloy to quantify these effects. Accounting for artifacts reveals systematic softening with temperature, while Cr and Ni additions boost resistance ...
Velislava Yonkova, Steffen Brinckmann, Ruth Schwaiger   +2 more
wiley   +1 more source

Driven geometric phase gates with trapped ions

New Journal of Physics, 2013
We describe a hybrid laser–microwave scheme to implement two-qubit geometric phase gates in crystals of trapped ions. The proposed gates can attain errors below the fault-tolerance threshold in the presence of thermal, dephasing, laser-phase and ...
A Lemmer, A Bermudez, M B Plenio
doaj   +1 more source

A Demonstration of LISA Laser Communication

, 2006
Over the past few years questions have been raised concerning the use of laser communications links between sciencecraft to transmit phase information crucial to the reduction of laser frequency noise in the LISA science measurement.
, , Bender P L, Jennrich O, Marin A F G, McNamara P, Pollack S E, Pollack S E Jennrich O Stebbins R T Bender P Finn L S, R T Stebbins, S E Pollack, Sheard B S, Tinto M   +11 more
core   +1 more source

The Impact of Dispersion on Amplitude and Frequency Noise in a Yb-fiber Laser Comb [PDF]

, 2011
We describe a Yb-fiber based laser comb, with a focus on the relationship between net-cavity dispersion and the frequency noise on the comb. While tuning the net cavity dispersion from anomalous to normal, we measure the amplitude noise (RIN), offset ...
Adler, Dong, Fermann, Gordon, Grüner-Nielsen, Holman, Jones, Knox, Lora Nugent-Glandorf, Namiki, Newbury, Prochnow, Schibli, Scott A. Diddams, Sugg, Telle, Todd A. Johnson, Washburn, Wise, Yohei Kobayashi, Yost, Zhou   +21 more
core   +3 more sources