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Home / Applications / Absolute Reflectance Measurement of a Dichroic Mirror using UV-Visible/NIR Spectroscopy

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Absolute Reflectance Measurement of a Dichroic Mirror using UV-Visible/NIR Spectroscopy

By Heather Haffner

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February 27, 2024

Introduction

V-670 UV-Vis Spectrophotometer
V-670 UV-Vis Spectrophotometer

A dichroic mirror is an optical element consisting of multi-layered dielectric materials that have different refractive indexes. This enables the mirror to reflect the light of a specific wavelength and transmit the light of another. Dichroic mirrors have different spectral characteristics, depending on the angle or polarization of the incident light. Therefore, in the evaluation of dichroic mirrors, it is necessary to elucidate its spectral characteristics.

An absolute reflectance accessory can be used to measure transmittance and reflection, whilst changing the incident angle and/or the polarization of the incident light. The JASCO absolute reflectance accessories orient the incident light at an angle of θ to the sample. The reflected light from the sample is then passed to an  integrating sphere, where the detector angle is set as θ-2-θ (Figure 1, right). The integrating sphere can measure an absolute reflectance spectrum that cannot be obtained by relative reflectance measurement. In addition, influence from light source fluctuations is removed using a double-beam method that simultaneously transmits the reference beam to the detector in the integrating sphere.

Relative reflectance measurement (left) and absolute reflectance measurement (right)
Figure 1. Relative reflectance measurement (left) and absolute reflectance measurement (right).

This application note demonstrates the use of an absolute reflectance measurement system that employs an integrating sphere based detector to measure the polarization and incident angle dependence and evaluate the spectral characteristics of a dichroic mirror.

Keywords

260-UV-0001, V-670, UV-Visible/NIR spectroscopy, Integrating sphere, Absolute reflectance, Materials, dichroic mirror

Results

Figure 2 shows the reflectance spectrum under different polarization conditions, while Figures 3 and 4 illustrate the anglular dependence of the reflectance spectrum under the p and s polarizations, respectively. It is seen that for both s and p polarizations, the reflection region expands to the longer wavelength side with increase in the incident angle.

Reflectance spectrum of s (red), p (blue), and natural light (pink) polarizations
Figure 2. Reflectance spectrum of s (red), p (blue), and natural light (pink) polarizations.
Angle-dependent reflectance spectrum for p polarization. The angles are: 30 (blue), 35 (green), 40 (maroon), 45 (teal), 50 (yellow), 55 (pink), and 60 (red) degrees
Figure 3. Angle-dependent reflectance spectrum for p polarization. The angles are: 30 (blue), 35 (green), 40 (maroon), 45 (teal), 50 (yellow), 55 (pink), and 60 (red) degrees.
Figure 4. Angle-dependent reflectance spectrum for s polarization. The angles are: 30 (blue), 35 (green), 40 (maroon), 45 (teal), 50 (yellow), 55 (pink), and 60 (red) degrees.
This document has been prepared based on information available at the time of publication and is subject to revision without notice. Although the contents are checked with the utmost care, we do not guarantee their accuracy or completeness. JASCO Corporation assumes no responsibility or liability for any loss or damage incurred as a result of the use of any information contained in this document. Copyright and other intellectual property rights in this document remain the property of JASCO Corporation. Please do not attempt to copy, modify, redistribute, or sell etc. in whole or in part without prior written permission.

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About the Author

JASCO Application Note

Absolute Reflectance Measurement of a Dichroic Mirror using UV-Visible/NIR Spectroscopy

Introduction

V-670 UV-Vis Spectrophotometer
V-670 UV-Vis Spectrophotometer

A dichroic mirror is an optical element consisting of multi-layered dielectric materials that have different refractive indexes. This enables the mirror to reflect the light of a specific wavelength and transmit the light of another. Dichroic mirrors have different spectral characteristics, depending on the angle or polarization of the incident light. Therefore, in the evaluation of dichroic mirrors, it is necessary to elucidate its spectral characteristics.

An absolute reflectance accessory can be used to measure transmittance and reflection, whilst changing the incident angle and/or the polarization of the incident light. The JASCO absolute reflectance accessories orient the incident light at an angle of θ to the sample. The reflected light from the sample is then passed to an  integrating sphere, where the detector angle is set as θ-2-θ (Figure 1, right). The integrating sphere can measure an absolute reflectance spectrum that cannot be obtained by relative reflectance measurement. In addition, influence from light source fluctuations is removed using a double-beam method that simultaneously transmits the reference beam to the detector in the integrating sphere.

Relative reflectance measurement (left) and absolute reflectance measurement (right)
Figure 1. Relative reflectance measurement (left) and absolute reflectance measurement (right).

This application note demonstrates the use of an absolute reflectance measurement system that employs an integrating sphere based detector to measure the polarization and incident angle dependence and evaluate the spectral characteristics of a dichroic mirror.

Results

Figure 2 shows the reflectance spectrum under different polarization conditions, while Figures 3 and 4 illustrate the anglular dependence of the reflectance spectrum under the p and s polarizations, respectively. It is seen that for both s and p polarizations, the reflection region expands to the longer wavelength side with increase in the incident angle.

Reflectance spectrum of s (red), p (blue), and natural light (pink) polarizations
Figure 2. Reflectance spectrum of s (red), p (blue), and natural light (pink) polarizations.
Angle-dependent reflectance spectrum for p polarization. The angles are: 30 (blue), 35 (green), 40 (maroon), 45 (teal), 50 (yellow), 55 (pink), and 60 (red) degrees
Figure 3. Angle-dependent reflectance spectrum for p polarization. The angles are: 30 (blue), 35 (green), 40 (maroon), 45 (teal), 50 (yellow), 55 (pink), and 60 (red) degrees.
Figure 4. Angle-dependent reflectance spectrum for s polarization. The angles are: 30 (blue), 35 (green), 40 (maroon), 45 (teal), 50 (yellow), 55 (pink), and 60 (red) degrees.

Keywords

260-UV-0001, V-670, UV-Visible/NIR spectroscopy, Integrating sphere, Absolute reflectance, Materials, dichroic mirror

This document has been prepared based on information available at the time of publication and is subject to revision without notice. Although the contents are checked with the utmost care, we do not guarantee their accuracy or completeness. JASCO Corporation assumes no responsibility or liability for any loss or damage incurred as a result of the use of any information contained in this document. Copyright and other intellectual property rights in this document remain the property of JASCO Corporation. Please do not attempt to copy, modify, redistribute, or sell etc. in whole or in part without prior written permission.
28600 Mary’s Court, Easton, MD 21601 USA • (800) 333-5272 • Fax: (410) 822-7526 • jascoinc.com/applications

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