Depolarizer and circular dichroism spectrometer using the same
AssigneeJasco Corporation
InventorsTetsuji Sunami, Keisuke Watanabe, Jun Koshobu
Life of this patent
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Abstract
A depolarizer includes a pair of wedge-shaped plates made of an optically isotropic material, laid one on top of another such that the total thickness is constant and wedge-plate holding means for holding the pair of wedge plates separately. The wedge-plate holding means includes a pressure-applying section for applying pressure to each of the pair of wedge plates in a direction perpendicular to the thickness direction of the pair of wedge plates. The pressure-applying direction for one of the pair of wedge plates and the pressure-applying direction for the other of the pair of wedge plates intersect at an angle of 45 degrees.
Claims13
A circular dichroism spectrometer including:
- a polarizer configured to transmit light having a specific linear polarization in a light beam coming from a light source;
- a polarization modulator configured to generate right-handed circularly polarized light and left-handed circularly polarized light alternately by modulating the linearly polarized light;
- a sample setting portion which is alternately exposed to the right-handed circularly polarized light and the left-handed circularly polarized light;
- a depolarizer which is disposed after the sample setting portion to depolarize the beam reflected or transmitted by the sample setting portion;
- and
- a detector configured to detect the intensity of the depolarized light,
- wherein the depolarizer includes:
- a pair of wedge-shaped plates made of an optically isotropic material, laid one on top of another such that the total thickness is constant;
- and wedge-plate holding means for holding the pair of wedge plates separately,
- wherein the wedge-plate holding means includes a pressure-applying section for applying pressure to each of the pair of wedge plates in a direction perpendicular to the thickness direction of the pair of wedge plates,
- wherein the pressure-applying direction for one of the pair of wedge plates and the pressure-applying direction for the other of the pair of wedge plates intersect at an angle of 45 degrees,
- wherein the detector is configured to obtain a difference in absorbance between the right-handed circularly polarized light and the left-handed circularly polarized light in accordance with a change in the detected intensity of light.
A circular dichroism spectrometer including:
- a depolarizer which is disposed after a light source to depolarize a light beam coming from the light source;
- a sample setting portion which is exposed to the depolarized light beam;
- a polarization modulator configured to modulate light reflected or transmitted by the sample setting portion;
- a polarizer configured to transmit linearly polarized light having a specific polarization plane in the modulated light beam;
- and
- a detector configured to detect the intensity of the linearly polarized light, wherein the depolarizer includes:
- a pair of wedge-shaped plates made of an optically isotropic material, laid one on top of another such that the total thickness is constant;
- and wedge-plate holding means for holding the pair of wedge plates separately,
- wherein the wedge-plate holding means includes a pressure-applying section for applying pressure to each of the pair of wedge plates in a direction perpendicular to the thickness direction of the pair of wedge plates,
- wherein the pressure-applying direction for one of the pair of wedge plates and the pressure-applying direction for the other of the pair of wedge plates intersect at an angle of 45 degrees,
- wherein the detector is configured to obtain a difference in absorbance between right-handed circularly polarized light and left-handed circularly polarized light in the depolarized light beam in accordance with variations in the detected intensity of light.
Dependencies are inferred from the claim text.