TTR experimental setup.
TTR signal demonstrating a signal with a picosecond relaxation time constant. The nontransient and transient signals are on the same order of magnitude. The scan was taken on a Au film deposited on a fused silica substrate.
TTR signal demonstrating a signal with a picosecond relaxation time constant. The transient signal is stronger than the nontransient signal. The scan was taken on a Au film deposited on a fused silica substrate.
Normalized results of the scans shown in Figs. 2 and 3 after the phase correction model was used to account for both the magnitude and phase of the signal.
TTR scan taken on a Pt film deposited on silicon. This decay time constant is on the order of a nanosecond. Both the magnitude and the phase of the signal are still important.
Schematic of modulation envelope, pump pulses, thermal response, probe pulses, and input signal to the lock-in amplifier vs time. Both axes have arbitrary units and are meant to give a qualitative understanding of signal simulations. In reality pulses are typically apart and there are 38–40 pump pulses per modulation envelope.
Simulated measured signal and phase using Eqs. (5)–(7) with , , , , and no pump noise. The actual and corrected signals are also shown.
Error for uncorrected, phase corrected, and offset corrected simulated signals vs for an exponential decay defined by Eq. (9). Case 1: corrected signal for simulated data with no noise nor slow decay . Case 2: and . Case 3: , , and .
Error for uncorrected, phase corrected, and offset corrected simulated signals vs for a Gaussian decay defined by Eq. (11). , , and .
Measured probe spot radius and center location at different stage delay times using a sweeping knife edge.
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