Tunable mid-infrared generation using a synchronized programmable fiber lasers

Théberge, F.; Châteauneuf, Marc; Dubois, Jacques; Villeneuve, A.; Salhany, Joseph; Burgoyne, Bryan

doi:10.1109/phosst.2011.6000050

Cited by 1 publication

(2 citation statements)

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“…Traditionally, DFG with narrow linewidth fundamental pulses achieves tunability by tuning one laser while the other remains fixed. 40 After pulses are chirped, the overlapping of two pulses leads to reduced frequency bandwidth, and hence the spectral resolution of the generated mid-IR beam is improved. In the spectral focused DFG setup, varying the time delay will change the frequency overlapping of two fundamental pulses, thus the central wavelength of the generated beam will also be changed.…”

Section: Theoretical Calculationmentioning

confidence: 99%

“…Spectral focusing schemes have been extensively utilized for hyperspectral coherent anti-Stokes Raman scattering and SRS imaging. − Here, we show the first demonstration of spectral focusing DFG for mid-infrared photothermal imaging purposes. Traditionally, DFG with narrow line width fundamental pulses achieves tunability by tuning one laser while the other remains fixed . After pulses are chirped, the overlapping of two pulses leads to reduced frequency bandwidth, and hence the spectral resolution of the generated mid-IR beam is improved.…”

Section: Theoretical Calculationmentioning

confidence: 99%

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Bond-Selective Imaging of Cells by Mid-Infrared Photothermal Microscopy in High Wavenumber Region

Bai

Zhang

et al. 2017

J. Phys. Chem. B

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Using a visible beam to probe the thermal effect induced by infrared absorption, mid-infrared photothermal (MIP) microscopy allows bond-selective chemical imaging at submicron spatial resolution. Current MIP microscopes cannot reach the high wavenumber region due to the limited tunability of the existing quantum cascade laser source. We extend the spectral range of MIP microscopy by difference frequency generation (DFG) from two chirped femtosecond pulses. Flexible wavelength tuning in both C-D and C-H regions was achieved with mid-infrared power up to 22.1 mW and spectral width of 29.3 cm. Distribution of fatty acid in live human lung cancer cells was revealed by MIP imaging of the C-D bond at 2192 cm.

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Section: Theoretical Calculationmentioning

confidence: 99%