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Calorimetric absorption coefficient measurements using pulsed CO(2) lasers.

L C Nistor, S V Nistor, V Teodorescu

|March 11, 2010

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This study introduces a calorimetric method using pulsed carbon dioxide (CO2) lasers to measure the absorption coefficient of low-loss materials. This technique minimizes surface effects, providing accurate bulk absorption values for materials like potassium chloride (KCl).

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Area of Science:

Materials Science
Laser Physics
Optical Engineering

Background:

Accurate measurement of optical absorption coefficients is crucial for developing low-loss optical materials.
Traditional methods can be sensitive to surface conditions, complicating bulk property determination.
Carbon dioxide (CO2) lasers offer specific wavelengths suitable for probing material absorption.

Purpose of the Study:

To develop and validate a novel calorimetric technique for measuring the absorption coefficient of low-loss materials.
To compare results obtained using pulsed CO2 lasers with those from continuous-wave (cw) CO2 lasers.
To investigate the influence of surface quality on absorption coefficient measurements.

Main Methods:

An experimental setup was designed utilizing calorimetry to measure heat absorption.
Pulsed carbon dioxide (CO2) lasers were employed as the radiation source.
Measurements were performed on long rod potassium chloride (KCl) samples.

Main Results:

The absorption coefficient was successfully measured using the pulsed CO2 laser calorimetry method.
Results obtained in the pulsed regime showed minimal dependence on the quality of sample end surfaces.
Measured values closely approximated the bulk absorption coefficients of the KCl samples.

Conclusions:

The developed calorimetric method with pulsed CO2 lasers is effective for determining the bulk absorption coefficient of low-loss materials.
The technique mitigates errors associated with surface absorption by effectively dissipating surface-absorbed heat through radiation.
This approach offers a more robust measurement of intrinsic material properties compared to methods sensitive to surface conditions.