Applications of Mid-IR Pulse Shaping
There are many application of mid-IR pulse shaping. Here are a few examples, along with schematics of experimental layouts.
Please contact us with questions about how to use mid-IR pulse shaping in these and other experiments.
|2D IR Spectroscopy & Coherent Control of Vibrations|
Pulse shaping is quickly becoming the preferred method of collecting 2D IR spectra.
The majority of the mid-IR source is sent through a PhaseTech pulse shaper, which generates the pump pair. A small fraction of the mid-IR source (a little as 2-3%) is sent around the shaper and is used as the probe pulse. The probe pulse is detected with a spectrometer and mid-IR array detector.
The same basic setup can also be used for coherent control experiments. The shaper is used to generate arbitrarily shaped pulses which interact with the sample, while the probe pulse is used to detect the state of the system.
ReferencesResidue-specific structural kinetics of proteins through the union of isotope labeling, mid-IR pulse shaping, and coherent 2D IR spectroscopy, Methods (2010), 50, 12-22 Controlling Vibrational Excitation with Shaped Mid-IR Pulses, Phys. Rev. Lett. (2007), 99, 038102 Mode selectivity with polarization shaping in the mid-IR, New J. Phys (2009), 11, 105046
|2D Heterodyned SFG Spectroscopy|
Add a PhaseTech pulse shaper to your existing SFG or heterodyned SFG setup to measure 2D SFG spectra.
2D heterodyned SFG combine the surface selectivity and monolayer sensitivity of SFG with the enhanced spectral resolution and information content of 2D IR spectroscopy.
ReferencesAdding a dimension to the infrared spectra of interfaces using heterodyne detected 2D sum-frequency generation (HD 2D SFG) spectroscopy Proc. Natl. Acad. Sci. USA (2011), 108, 20902-20907
|Transient 2D IR Spectroscopy|
Transient 2D IR spectroscopy is a power method for studying excited-state dynamics because it directly correlates ground- and excited-state marker bands as well as provides enhanced structural information through crosspeaks and 2D lineshapes.
Mid-IR pulse shaping simplifies the experimental setup of transient 2D IR spectroscopy and improves signal-to-noise through fast delay scanning, phase cycling and the use of a rotating frame.
ReferencesTransient 2D IR Spectroscopy of Charge Injection in Dye-Sensitized Nanocrystalline Thin Films, J. Am. Chem. Soc. (2009), 131, 1520-1526
|Time-Domain SFG & Other Delay Scanning|
Here a PhaseTech pulse shaper is used to rapidly scan the time delay between the mid-IR and upconversion pulse. Shot-by-shot scanning provides improved signal-to-noise over traditional, optical delay lines. Pulse shaping also allows the use of other techniques which improves signal-to-noise, such as phase cycling and collecting the signal in a rotating frame.
ReferencesTime-Domain SFG Spectroscopy Using Mid-IR Pulse Shaping: Practical and Intrinsic Advantages, J. Phys. Chem. B (2011), 115, 2536-2546
|Economical Transient Mid-IR Spectroscopy & Other Spectrally-Resolved Measurements|
Our PhaseTech pulse shaper can be used measure the spectrum of a mid-IR pulse via time- or frequency-domain scanning.
Eliminates the need for an expensive spectrometer and mid-IR array detector.
Provides nearly arbitrary tuning of spectral range and resolution, set through software.
ReferencesSimplified and economical 2D IR spectrometer design using a dual acousto-optic modulator, Chem. Phys. (2012)