Synchrotron-based high-pressure research in materials science Page: 4 of 19
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Reference leg Delay leg
Glass bar slows and bends light to
move apparent mirror position closer
In bea~msp ftr-
Eighth wave plate Apparent mirror pc
fled light from
0* Beamsplitter Distance bet
Polarizing beamsphtters apparent mirr
900 1800 position equa
Doppler-shifted light is delayed by transmission through a glass bar before interfering with itself. Over
this short delay (-1/3 ns), the change in Doppler-shift is usually small. The glass bar length and the
mirror-to-bearnsplitter distances are adjusted to match the interfering wavefronts from both
interferometer legs for recombining them at the bearnsplitter.
1. VISAR <Vclocit niterieroiieicr sicc for Any Rdcireo avoids excessively high beat frequencies, even at high velocities.
2. No spatial coherence of light is required. This permits use of multi-mode optical fibers for probes.
3. Laser temporal coherence must only exceed the short interferometer delay.
4. Quadrature-coding eliminates signal ambiguity between acceleration and deceleration.
5. Push-pull output doubles signal amplitudes while eliminating common-mode noise.
13 Sept 04
Unclassified LA-UR #04-4016 2
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Chen, Bin; Lin, Jung-Fu; Chen, Jiuhua; Zhang, Hengzhong & Zeng, Qiaoshi. Synchrotron-based high-pressure research in materials science, article, June 1, 2016; (digital.library.unt.edu/ark:/67531/metadc930157/m1/4/: accessed February 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.