Temporal Compression by Stimulated Brillouin Scattering of Q-switched Pulse with Fused Quartz Glass

Abstract

A nonlinear acoustic measurement is studied for creep damage evaluation. An electromagnetic acoustic transducer (EMAT) magnetostrictively couples to a surface-shear-wave resonance along the circumference of a cylindrical specimen during the creep of Cr-Mo-V steels. The excitation of the EMAT at half of the resonance frequency caused a standing wave to contain only the second-harmonic component, which was received by the same EMAT for determining the second-harmonic amplitude. This measured surface-wave nonlinearity showed a peak at 30% and a minimum at 50% of the total life. We interpreted these phenomena in terms of dislocation mobility and restructuring, with support from scanning electron microscope (SEM) and transmission electron microscope (TEM) observations. This noncontact resonance-EMAT measurement can monitor the evolution of surface-shear-wave nonlinearity throughout creep life and has a potential to assess damage advance and predict the creep life of metals. #

Developments of Picosecond Lasers Based on Stimulated Brillouin Scattering Pulse Compression

“…They obtained the compressed pulse with a width of 4 ns in methane [64]. Since then, a large number of groups have used the structure to perform compression in different media [65][66][67][68][69][70][71][72][73] (as shown in Table 1). For instance, Kmetik et al compressed the pulse width from 10 to 0.9 ns with an energy of 0.57 J in ultra-filtered FC-75 liquid medium and obtained up to 94% energy reflectivity [71].…”

Trends in stimulated Brillouin scattering and optical phase conjugation

“…The use of SBS for the compression of laser pulses has been investigated theoretically and experimentally for various types of lasers and active medium (Schiemann et al, 1997;Dane et al, 1994a;Yoshida et al, 2004a;Neshev et al, 1999). The design of SBS based compressors for the generation of sub-nanoseconds pulses for the energies approaching the Joule level is an active field of research (Hon, 1980).…”

The Current Trends in SBS and phase conjugation

“…The stimulated Brillouin scattering (SBS) in various solids, liquids, and gases is a very powerful tool to build the The Current Trends in SBS and phase conjugation phase conjugation mirror (PCM) in high-power laser systems (Rockwell, 1988;Dane et al, 1994a;Yoshida et al, 1997Yoshida et al, , 1999Yoshida et al, , 2003Yoshida et al, , 2004Kong et al, 2005bKong et al, , 2005cKong et al, , 2006Kong et al, , 2007aMeister et al, 2007;Kappe et al, 2007;Yasuhara et al, 2008). A PCM based on the SBS process can be successfully used to compensate thermally induced phase distortion in high power laser systems.…”