High sensitivity pump–probe measurements of magnetic, thermal, and acoustic phenomena with a spectrally tunable oscillator

Gomez, Michael J.; Liu, Kexin; Lee, Jonathan G.; Wilson, Richard B.

doi:10.1063/1.5126121

Title: High sensitivity pump–probe measurements of magnetic, thermal, and acoustic phenomena with a spectrally tunable oscillator

Journal Article · Tue Feb 11 00:00:00 EST 2020 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5126121· OSTI ID:1802450

Gomez, Michael J. ^[1];

^[1]; Lee, Jonathan G. ^[1];

^[1]

Univ. of California, Riverside, CA (United States)

We describe an optical pump/probe system for sensitive measurements of time-resolved optical measurements of material dynamics. The instrument design is optimized for time-resolved magneto-optic Kerr effect (TR-MOKE) measurements of dynamics in magnetic materials. The system also allows for time-domain thermoreflectance (TDTR) measurements of thermal transport properties and picosecond acoustic measurements of film thickness and/or elastic constants. The system has several advantages over the conventional designs for TR-MOKE and/or TDTR systems. Measurements of pump-induced changes to the probe beam intensity are shot-noise limited. The system’s design allows for MOKE and/or thermoreflectance measurements of both sides of a sample. Pumping and probing the sample on opposite sides allows nanoscale flash diffusivity measurements of transport properties. The wavelengths of the pump and probe beams are straightforward to tune between 350–525 nm and 690–1050 nm. A tunable wavelength allows for optical resonances in a wide array of materials to be excited and/or probed. Finally, the setup is calibrated to allow for the real and imaginary components of Kerr signals to be separately quantified.

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Research Organization:: Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Army Research Office (ARO)

Grant/Contract Number:: SC0012670; W911NF-18-1-0364

OSTI ID:: 1802450

Alternate ID(s):: OSTI ID: 1598915

Journal Information:: Review of Scientific Instruments, Vol. 91, Issue 2; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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