title: Dual-wavelength, continuous-wave Yb:YAG laser for high-resolution photothermal common-path interferometry.
abstract: We present a continuous-wave (CW) intracavity frequency-doubled Yb:YAG laser providing 1030 and 515 nm output simultaneously. This laser system was designed for photothermal common-path interferometry to measure spatially resolved profiles of the linear absorption in dielectric media and coatings for visible or infrared light as well as of the nonlinear absorption for the combination of both. A Z-shape laser cavity was designed, providing a beam waist in which an LBO crystal was located for effective second-harmonic generation (SHG). Suitable frequency conversion parameters and cavity configurations were discussed to achieve the optimal performance of a diode-pumped CW SHG laser. A 12.4 W 1030 nm laser and 5.4 W 515 nm laser were developed simultaneously in our experiment.
authors.affiliation: Fraunhofer Institute for Laser Technology, Steinbachstrasse 15, Aachen 52074, Germany. fjzhuang@gmail.com
authors.forename: Fengjiang
authors.initials: F
authors.lastname: Zhuang
authors.forename: Bernd
authors.initials: B
authors.lastname: Jungbluth
authors.forename: Bastian
authors.initials: B
authors.lastname: Gronloh
authors.forename: Hans-Dieter
authors.initials: HD
authors.lastname: Hoffmann
authors.forename: Ge
authors.initials: G
authors.lastname: Zhang
mesh_terms: D000042:Absorption; D004867:Equipment Design; D007259:Infrared Rays; D007368:Interferometry / Q000295:instrumentation / Q000379:methods; D053844:Lasers, Solid-State; D008027:Light; D012031:Refractometry; D013696:Temperature; D013997:Time Factors; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D015018:Ytterbium