Two-tint pump-probe measurements using a femtosecond laser oscillator and sharp-edged optical filters
Abstract
We describe a simple approach for rejecting unwanted scattered light in two types of time-resolved pump-probe measurements, time-domain thermoreflectance (TDTR) and time-resolved incoherent anti-Stokes Raman scattering (TRIARS). Sharp edged optical filters are used to create spectrally distinct pump and probe beams from the broad spectral output of a femtosecond Ti:sapphire laser oscillator. For TDTR, the diffusely scattered pump light is then blocked by a third optical filter. For TRIARS, depolarized scattering created by the pump is shifted in frequency by ≈250 cm−1 relative to the polarized scattering created by the probe; therefore, spectral features created by the pump and probe scattering can be easily distinguished.
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Over the past two decades, TDTR has emerged and evolved as a reliable, powerful, and versatile technique to measure thermal properties of a wide range of bulk and thin film materials and their interfaces.
“Over the past two decades, ultrafast laser-based time-domain thermoreflectance (TDTR) has emerged and evolved as a reliable, powerful, and versatile technique to measure the thermal properties of a wide range of bulk and thin film materials and their interfaces.”
From Tutorial: Time-domain thermoreflectance (TDTR) for thermal property characterization of bulk and thin film materials (2018) · cites this paper as [23]
The two-tint and two-color approaches can effectively filter the reflected pump beam but at a significant sacrifice of laser power.
“Both the two-tint and the two-color approach can effectively filter the reflected pump beam but at a significant sacrifice of the laser power.”
From Tutorial: Time-domain thermoreflectance (TDTR) for thermal property characterization of bulk and thin film materials (2018) · cites this paper as [23]
The two-tint method has a high demand on laser stability in both intensity and wavelength; otherwise fluctuations in laser wavelength translate into fluctuations in the power intensities of the pump and probe beams and appear as noise in TDTR measurements.
“In addition, the two-tint method has a high demand on the laser stability in both the intensity and the wavelength (like the one reported in Ref. 23 ). Otherwise, the fluctuations in the laser wavelength would translate into fluctuations in the power intensities of the pump and probe beams and appear as noise in TDTR measurements (like the one reported in Ref. 95 ).”
From Tutorial: Time-domain thermoreflectance (TDTR) for thermal property characterization of bulk and thin film materials (2018) · cites this paper as [23]
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- Authors
- Kang, K., Koh, Y. K., Chiritescu, C., Zheng, X., & Cahill, D. G.
- Affiliations
- University of Illinois Urbana-Champaign (US)
- Venue
- Review of Scientific Instruments
- Publisher
- AIP Publishing
- Published
- 2008-11-01
- Volume
- 79
- Issue
- 11
- Pages
- 114901-114901
- ISSN
- 0034-6748 (ISSN-L)
- 1089-7623
- OpenAlex
- W2050181169
- Cited by
- 209
- References
- 0
- Citations by year
- 2026: 6 · 2025: 14 · 2024: 11 · 2023: 11 · 2022: 9 · 2021: 17 · 2020: 19 · 2019: 15 · 2018: 17 · 2017: 21 · 2016: 16 · 2015: 5 · 2014: 12 · 2013: 9 · 2012: 12
- FWCI
- 8.01
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Review of Scientific Instruments (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Engineering › Mechanics of Materials › Thermography and Photoacoustic Techniques
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Spectroscopy Techniques in Biomedical and Chemical Research
- Keywords
- time-domain thermoreflectance, femtosecond Ti:sapphire laser
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