The Krummel Research Group is housed in approximately 2600 square feet of laboratory space and additional office space. Our laser labs occupy 1300 square feet and house our 2D IR spectrometer. Our wet chemistry space is housed in the Flex Lab and occupies 1300 square feet. The Flex Lab is rich in synthetic chemistry space and instrumentation due to the combined efforts of Prof. Reynolds and Prof. Krummel. The graduate student office, laser lab 1, laser lab 2, laser lab 3, and the Flex Lab can be found in Chemistry B113 corridor, B108, B108A, B207, and B114, respectively. Below are pictures and descriptions of the facilities. Additional resources are added to these laboratories on a routine basis.
Our 2D IR Spectrometer
Our 2D IR spectrometer is built around an ultrafast Ti:Sapphire oscillator and amplifier that produce 50 fs optical pulses centered at 800 nm and currently operates at a 1kHz repetition rate. A mid-IR pulse shaper is used to generate pulse pairs and a second beam path is utilized to control a third mid-IR pulse. A partially collinear beam geometry is used at the sample to generate a 3rd order signal which is collected with a monochromator and an array detector.
Optical parametric chirped pulse amplification (OPCPA) combines chirped pulse amplification (CPA) with optical parametric amplification. The OPA portion is combined with this CPA technique to utilize the relatively low thermal load in the gain material associated with OPA processes which will allow it to be operated at high repetition rate and average power in systems. OPCPA systems have been developed for mid-IR generation, but the maximum central wavelength to which these systems have been tuned is 4 μm. We are constructing an OPCPA system that will generate mid-IR pulses out to 6 μm at a repetition rate of 50 kHz. This repetition rate will afford a faster acquisition time for nonlinear IR microscopy purposes. Currently, the system is producing pulses centered at 2.67 μm with 3.5 μJ pulse energies that are being used to generate continuum light in YAG.
Our SFG Spectrometer
Our SFG spectrometer is built around an ultrafast Ti:Sapphire oscillator and regenerative amplifier that produce 50 fs optical pulses centered at 800 nm and operates at a 1kHz repetition rate. A portion of the 800 nm light is used to generate mid-IR pulses with an OPA. The 800 nm and mid-IR pulses are overlapped on a sample to generate a 2nd order signal at the sum of their frequencies which is then collected with a spectrometer and CCD camera.
Our FT-IR Spectrometer and Microscope
The FT-IR spectrometer is housed in Laser Lab 2. The spectrometer is a Vertex 70 FT-IR spectrometer. It is used for routine sample analysis as well as structural characterization of proteins, peptides, and model compounds related to geochemical applications. We have a Hyperion 3000 Bruker Optics Microscope attached to our FTIR. The broadband IR source, can be used in either reflectance, transmission, or ATR. The samples sit on a motorized stage for automated stitching of both brightfield and infrared images. Signal is measured by a 64 x 64 MCT element Focal Plane Array, where each element collects a full FTIR spectrum. Through the OPUS software, chemical mapping can be accomplished based off of each spectra collected.
The Krummel Research Group is located on the first floor of the Chemistry building