title: Mid-IR beam direction stabilization scheme for vibrational spectroscopy, including dual-frequency 2DIR.
abstract: A compact laser beam direction stabilization scheme is developed that provides the angular stability of better than 50 μrad over a wide range of frequencies from 800 to 4000 cm-1. The schematic is fully automated and features a single MCT quadrant detector. The schematic was tested to stabilize directions of the two IR beams used for dual-frequency two-dimensional infrared (2DIR) measurements and showed excellent results: automatic tuning of the beam direction allowed achieving the alignment quality within 10% of the optimal alignment obtained manually. The schematic can be easily implemented to any nonlinear spectroscopic measurements in the mid-IR spectral region.
authors.forename: Clara M
authors.initials: CM
authors.lastname: Nyby
authors.forename: Joel D
authors.initials: JD
authors.lastname: Leger
authors.forename: Jianan
authors.initials: J
authors.lastname: Tang
authors.forename: Clyde
authors.initials: C
authors.lastname: Varner
authors.forename: Victor V
authors.initials: VV
authors.lastname: Kireev
authors.forename: Igor V
authors.initials: IV
authors.lastname: Rubtsov