Results 81 to 90 of about 83,581 (314)

A Novel Frequency Stabilization Method for External Cavity Diode Lasers Based on PZT Modulation

IEEE Photonics Journal
The method of frequency stabilization using injection current modulation can cause mode hopping in the laser. It also fails to fully utilize the benefits of PZT modulation for narrowing the laser linewidth.
Rui Xu, Fangjun Qin, Zhichao Ding, An Li
doaj   +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

Excited state spatial distributions in a cold strontium gas [PDF]

, 2012
This thesis describes the development of a new technique for measuring the spatial distribution of Rydberg atoms in a cold strontium gas. Strontium atoms are cooled and trapped in a magneto-optical trap and coherently excited to Rydberg states in a two ...
LOCHEAD, GRAHAM
core  

Performance Analysis of Abradable Coating Systems for Aircraft Gas Turbines

Advanced Engineering Materials, EarlyView.
Three CoNiCrAlY/YSZ/MgAl2O4 abradable liner configurations on a nickel‐superalloy are evaluated by thermal‐gradient cycling and incursion tests. Laser ablation of the bondcoat and/or Y2O3‐stabilized ZrO2 (YSZ) intermediate layer increases mechanical interlocking and bonding for thick topcoats.
Hanna Heyl, Daniel Emil Mack, Martin Tandler, Susanne Schrüfer, Robert Vaßen   +4 more
wiley   +1 more source

Passive stabilization of a passively mode-locked Nd : GdVO4 laser by inverse saturable absorption [PDF]

, 2008
A diode-pumped Nd:GdVO4 laser mode-locked by a semiconductor saturable absorber and output coupler (SESAOC) is passively stabilized to suppress Q-switched mode-locking.
Wang, YG, Miao, JG, Qian, LS, Peng, JY, Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Changchun 130033, Peoples R China. 电子邮箱地址: jiyingpengl11@163.com, Peng, JY, Ma, XY, Tan, HM, Wang, BS   +7 more
core  

III-V/Si Hybrid Laser Stabilization Using Micro-Ring Feedback Control

IEEE Photonics Journal, 2016
We present a real-time approach for stabilizing a III-V/Si hybrid external-cavity laser implemented using microring monitoring and a feedback control loop.
Jin-Hyoung Lee, Daniel Y. Lee, Ivan Shubin, Jock Bovington, Stevan S. Djordjevic, Shiyun Lin, Ying Luo, Jin Yao, John E. Cunningham, Kannan Raj, Ashok V. Krishnamoorthy, Xuezhe Zheng   +11 more
doaj   +1 more source

Is an Apple an Orange? A Large Language Model Benchmark for Candidate Term Extraction and Subclass Decisions Against Upper Ontologies in Engineering and Materials Science

Advanced Engineering Materials, EarlyView.
Building machine‐readable vocabularies for materials science is slow, expert‐driven work. This study benchmarks 13 large language models on two of its first steps: finding candidate terms in engineering articles and deciding where they belong in a class hierarchy.
Thomas Bjarsch, Maximilian Holland, Klaus Drechsler, Johannes Schilp   +3 more
wiley   +1 more source

Dual-wavelength operation of a figure-eight fiber laser¹ [PDF]

, 2012
We study numerically an erbium-doped figur-eight fiber laser including a doublé-bandpass optical filter for dual-wavelength pulse generation. Simulations are performed for several values of the filter band-width and wavelength separation between the ...
Baldemar Ibarra Escamilla, EVGENY KUZIN
core  

A Large Area Fiber Optic Gyroscope on multiplexed fiber network [PDF]

, 2013
We describe a fiber optical gyroscope based on the Sagnac effect realized on a multiplexed telecom fiber network. Our loop encloses an area of 20 km2 and coexists with Internet data traffic.
LEVI, FILIPPO, G. A. Costanzo, Levi, F., Costanzo, Giovanni Antonio, A. Mura, Pizzocaro, Marco, CALONICO, DAVIDE, M. Pizzocaro, D. Calonico, Clivati, Cecilia, Calonico, D., C. Clivati, F. Levi, Mura, A.   +13 more
core   +1 more source

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