Formation of diffractive microrelief on diamond film surface for IR laser beam control

2006 ◽  
Author(s):  
A. V. Volkov ◽  
S. A. Borodin ◽  
G. F. Kostyuk ◽  
V. S. Pavelyev
Keyword(s):  
Laser Beam ◽  
Diamond Film ◽  
Film Surface ◽  
Beam Control ◽  
Ir Laser

In-Situ Characterization of Thin Polycrystalline Diamond Film Quality by Thermal Wave and Raman Techniques

1989 ◽  
Vol 162 ◽  
Author(s):  
R. W. Pryor ◽  
P. K. Kuo ◽  
L. Wei ◽  
R. L. Thomas ◽  
P. L. Talley
Keyword(s):  
Thermal Conductivity ◽  
Laser Beam ◽  
Probe Beam ◽  
Diamond Film ◽  
Thermal Wave ◽  
Diamond Films ◽  
Film Surface ◽  
Polycrystalline Diamond ◽  
Probe Laser ◽  
Wave Technique

ABSTRACTIn this paper, the thermal wave technique and microfocus Raman spectroscopy are used to measure the relative quality of thin diamond films deposited on silicon. The thermal wave technique uses a modulated heating laser beam, normal to the diamond film surface, to initiate a thermal wave which propagates into the film, the substrate, and the overlying gas(ses). The accompanying modulated gas density is then interrogated by a second (probe) laser beam. The probe beam is deflected by the corresponding periodic changes in the gradient of the refractive index of the gas. The measured probe beam deflection versus offset position is fitted, using a theoretical solution of the three-dimensional thermal diffusion equation for the gas/film/substrate system. The physically important fitting parameter is the thermal diffusivity of the diamond film. Thermal conductivities derived from our diffusivity measurements using this method compare well to previous measurements on similarly prepared films by other methods. Our measured values for the thermal conductivity of the highest-quality polycrystalline diamond films are of the order of 12 W/cm-K. Our measured values of thermal conductivity for diamond films range between this value and the thermal conductivity of graphite. We have also made measurements on bulk diamond using the thermal wave technique, and we obtain a thermal conductivity of 21 W/cm-K, in excellent agreement with values found in the literature. A multi-scan, microfocus ratio of “graphitic” material to diamond material for a relative assessment of film quality.

Adaptive optical elements for laser beam control

2001 ◽  
Author(s):  
Alexis V. Kudryashov ◽  
Vadim V. Samarkin ◽  
Alexander Aleksandrov
Keyword(s):  
Laser Beam ◽  
Optical Elements ◽  
Beam Control

scholarly journals Nonlinear optics and liquid crystal light valve for laser beam control

2008 ◽  
Vol 139 ◽  
pp. 012010
Author(s):  
Jean Pierre Huignard ◽  
Arnaud Brignon ◽  
Bastien Steinhausser
Keyword(s):  
Liquid Crystal ◽  
Nonlinear Optics ◽  
Laser Beam ◽  
Beam Control ◽  
Light Valve

Carbon Dioxide Laser Beam Control for Corneal Surgery

1981 ◽  
Vol 12 (2) ◽  
pp. 117-122
Author(s):  
Richard H Keates ◽  
Leno S Pedrotti ◽  
Hugo Weichel ◽  
William H Possel
Keyword(s):  
Carbon Dioxide ◽  
Laser Beam ◽  
Carbon Dioxide Laser ◽  
Corneal Surgery ◽  
Beam Control

The principles of laser beam control with polarization gratings introduced as diffractive waveplates

2010 ◽  
Author(s):  
S. R. Nersisyan ◽  
N. V. Tabiryan ◽  
D. M. Steeves ◽  
B. R. Kimball
Keyword(s):  
Laser Beam ◽  
Beam Control ◽  
Polarization Gratings

Liquid crystal near-IR laser beam shapers employing photoaddressable alignment layers for high-peak-power applications

2013 ◽  
Author(s):  
Kenneth L. Marshall ◽  
Debra Saulnier ◽  
Haiqing Xianyu ◽  
Svetlana Serak ◽  
Nelson Tabiryan
Keyword(s):  
Liquid Crystal ◽  
Laser Beam ◽  
Peak Power ◽  
High Peak ◽  
High Peak Power ◽  
Near Ir ◽  
Ir Laser ◽  
Alignment Layers

PDF computations for power-in-the-bucket measurements of an IR laser beam propagating in the maritime environment

2011 ◽  
Author(s):  
C. Nelson ◽  
S. Avramov-Zamurovic ◽  
R. Malek-Madani ◽  
O. Korotkova ◽  
R. Sova ◽  
...  
Keyword(s):  
Laser Beam ◽  
Ir Laser ◽  
Maritime Environment
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