Document Type
Article
Publication Date
2005
Publication Title
Review of Scientific Instruments
Abstract
The development of a multiple-channel lock-in optical spectrometer (LIOS) is presented, which enables parallel phase-sensitive detection at the output of an optical spectrometer. The light intensity from a spectrally broad source is modulated at the reference frequency, and focused into a high-resolution imaging spectrometer. The height at which the light enters the spectrometer is controlled by an acousto-optic deflector, and the height information is preserved at the output focal plane. A two-dimensional InGaAs focal plane array collects light that has been dispersed in wavelength along the horizontal direction, and in time along the vertical direction. The data is demodulated using a high performance computer-based digital signal processor. This parallel approach greatly enhances (by more than 100x) the speed at which spectrally resolved lock-in data can be acquired. The noise performance of a working system optimized for the 1.3 μm wavelength range is analyzed using a laser diode light source. Time-resolved absorption traces are obtained for InAsquantum dots embedded in a GaAs matrix, and for dispersed films of PbSenanocrystals.
Repository Citation
Fodor, Petru S.; Rothenberger, S.; and Levy, J., "320-Channel Dual Phase Lock-in Optical Spectrometer" (2005). Physics Faculty Publications. 199.
https://engagedscholarship.csuohio.edu/sciphysics_facpub/199
DOI
10.1063/1.1830013
Version
Publisher's PDF
Volume
76
Issue
1
