Abstract

An integrated optical system with high sensitivity and resolution was presented. This was made possible by coupling a probe to a monochromator directly, using an aspheric lens and an achromatic lens in the coupling path, using a dichroic filter with high transmission and a steep transitional zone as a beam splitter, increasing the throughput of the monochromator, and optimizing its structural parameters. This optical system has a high sensitivity; the tested spectrogram of a glass rod demonstrated that the signal-to-noise ratio measured by the integrated optical system was almost 4 times as high as an independent probe and monochromator. The optical system also has the advantages of high resolution (4  cm1 or 0.28 nm), low cost, and portable size. This work lays a good groundwork for the development of a high sensitivity, high resolution, and low cost integrated portable Raman spectrometer.

© 2016 Optical Society of America

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References

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Supplementary Material (9)

NameDescription
» Data File 1: CSV (25 KB)      Underlying values of mercury lamp spectrogram tested by two optical setups.
» Data File 2: CSV (10 KB)      Underlying values of the relationship between the power of Raman scattering and the numerical aperture of the collection lens.
» Data File 3: CSV (17 KB)      Underlying values of the CCL4 spectrogram tested by spherical and aspherical lenses.
» Data File 4: CSV (37 KB)      Underlying values of transmission/reflection curves of two shortpass dichroic filters.
» Data File 5: CSV (17 KB)      Underlying values of the CCL4 spectrogram tested by two shortpass dichroic filters.
» Data File 6: CSV (19 KB)      Underlying values tested for the spectrogram of oil used by the plano–convex and achromatic lenses.
» Data File 7: CSV (24 KB)      Underlying values for the tested spectrum resolution of the commercial spectrometer and integrated optical system.
» Data File 8: CSV (19 KB)      Underlying values of the CCL4 spectrogram measured on the front-illuminated and back-thinned CCDs.
» Data File 9: CSV (17 KB)      Underlying values of the glass rod spectrogram tested by the independent probe and monochromator and the integrated optical system.

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Figures (14)

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Equations (11)

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