High Sensitivity

High accuracy for transmittance and reflectance is SolidSpec-3700/3700DUV
required for the measurement of optical parts. The
SolidSpec-3700/37000DUV have three detectors,
which cover the range from ultraviolet to near-infrared.
The sensitivity in the near-infrared region is extremely
enhanced by using both InGaAs and cooled PbS detectors.
Highly accurate and highly sensitive spectra are obtainable
from ultraviolet to near-infrared.

Conventional spectrophotometers have used a
photomultiplier tube detector for the ultraviolet andsolid0201
visible region and a PbS detector for the near-infrared
region. However, neither detector has much sensitivity
near the detector switchover, which does not enable
high sensitivity measurement in this range. The
SolidSpec-3700/3700DUV enable high-sensitivity
measurements in the switchover range by using an
InGaAs detector.



High Sensitivity Measurement in NIR


The transmittance spectra of a sharp cut filter solid0202
measured on an InGaAs detector and a PbS
detector (conventional spectrophotometer) are
shown in the figure below. The
SolidSpec-3700/3700DUV demonstrate lower
noise between 850 and 1600nm. In the range
from 1300 to 1600nm, comparing with the
conventional spectrophotometer, noise is
reduced to 1/4.
The SolidSpec-3700/3700DUV achieve less than
0.1% noise level under conditions of transmittance
less than 1% in the range of 1300 to 1500nm.
High sensitivity in this wavelength range makes the SolidSpec-3700/3700DUV a powerful tool to measure low reflection samples, such as anti-reflective coatings or films used in optical communications.
Noise at 1500nm is at the world's lowest level: less than 0.00005Abs (slit width 8nm, RMS) with integrating sphere, and less than 0.00003Abs (slit width 2nm, RMS) with the Direct Detection Unit DDU/DDU-DUV.



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