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IMAGE: A pulsed beam of X-rays is incident on a diamond mask (blue), creating a grating of excitation on the sample. A laser beam (thin blue line on the right) is. view more
Credit: Ella Maru Studio (https://scientific-illustrations.com)
Transient grating spectroscopy is an elegant method that uses two laser pulses to activate a medium by creating an interference pattern made of parallel stripes of excitations that can be thermal, electronic, magnetic or even structural. The modulation depth of the pattern and its evolution can be measured by diffracting a third, time-delayed probe beam on the transient grating.