Apparatus and method for measurement of weak optical absorptions

Optics: measuring and testing – For light transmission or absorption – Of fluent material

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G01N 2100

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045442746

ABSTRACT:
The thermal lensing phenomenon is used as the basis for measurement of weak optical absorptions when a cell containing the sample to be investigated is inserted into a normally continuous-wave operation laser-pumped dye laser cavity for which the output coupler is deliberately tilted relative to intracavity circulating laser light, and pulsed laser output ensues, the pulsewidth of which can be related to the sample absorptivity by a simple algorithm or calibration curve. A minimum detection limit of less than 10.sup.-5 cm.sup.-1 has been demonstrated using this technique.

REFERENCES:
Andrews, C. L., Optics of the Electromagnetic Spectrum, Prentice-Hall Inc., 1960, pp. 352-355.
Gordon et al., "Long-Transient Effects in Lasers with Inserted Liquid Samples" J. Appl. Phys. 36, 3 (1965).
Cremers et al., Abstract WJ6 in the Advance Program for the Conference on Lasers and Electro-Optics (CLEO '81), Washington, DC, Jun. 10-12, 1981.
Solimini, D., "Accuracy & Sensitivity of the Thermal Lens Method for Measuring Absorption", Applied Optics, vol. 5, No. 12, (Dec. 1966), pp. 1931-1939.
Dovichi et al., "Time-Resolved Thermal Lens Calorimetry", Analyt Chem., vol. 53 (1981), pp. 106-109.
Jackson et al., "Photothermal Deflection Spectroscopy and Detection" Applied Optics, vol. 20, No. 8, (Apr. 15, 1981), pp. 1333-1344.

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