ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
In order to enhance the picosecond absorption spectroscopy, a dual linear image sensor was used for simultaneous intensity measurements of the probing and reference lights by a single polychromator. This detector enabled us to record a fairly well stabilized transient absorption spectrum, and its signal-to-noise (S/N) ratio was much improved. Although the base line spectrum (not averaged) recorded by using a broadband continuum (a self-phase modulation light generated by focusing the fundamental light pulse from a ruby laser into a BK-7 glass block) revealed that the base line fluctuation and drift were less than ±0.04 absorbance units, the five-times spectral average gave rise to the base line fluctuation and drift of less than ±0.01 absorbance units. For an absorption spectrum recorded at a slit width of ≤0.2 mm, the spectral resolution was found to be better than that recorded by a commercial spectrophotometer with a bandwidth of 1.0 nm.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1143911
