Device for preventing intensity reduction of optical signal, optical emission spectrometer, optical instrument, and mass spectrometer including the same
First Claim
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1. A device for preventing the intensity reduction of an optical signal, comprising:
- an optical emission spectrometer for measuring a plasma field from an emission spectrum image of the plasma field, wherein the plasma field is used for wafer processing, wherein the optical emission spectrometer comprises;
a window for collecting an emission spectrum of the plasma field, anda shielding filter positioned in front of the optical window, wherein the shielding filter has a mesh structure capable of blocking RF electromagnetic waves radiated from the plasma field and collects charged particles passing through the mesh.
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Abstract
A device for a device for preventing the intensity reduction of an optical signal, an optical emission spectrometer, an optical instrument, and a mass spectrometer including the same are provided. The device for preventing the intensity reduction includes a shielding filter which has a mesh structure capable of blocking RF electromagnetic waves radiated from a plasma field for a wafer processing, is installed in the front of an optical window of an optical emission spectrometer for measuring the plasma field from an emission spectrum image of the plasma field, and collects charging particles passing through the mesh.
17 Citations
17 Claims
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1. A device for preventing the intensity reduction of an optical signal, comprising:
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an optical emission spectrometer for measuring a plasma field from an emission spectrum image of the plasma field, wherein the plasma field is used for wafer processing, wherein the optical emission spectrometer comprises; a window for collecting an emission spectrum of the plasma field, and a shielding filter positioned in front of the optical window, wherein the shielding filter has a mesh structure capable of blocking RF electromagnetic waves radiated from the plasma field and collects charged particles passing through the mesh. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An optical emission spectrometer for measuring plasma, comprising:
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a shielding filter which has a mesh structure capable of blocking RF electromagnetic waves radiated from a plasma field is used for wafer processing, is installed in the front of an optical window into which an emission spectrum of the plasma field is inputted, and collects charged particles passing through the mesh; an optical system main body including a receiving lens receiving the plasma emission spectrum passing through the shielding filter, an aperture determining a size of the optical signal inputted to and/or outputted from the receiving lens, and a pinhole limiting the depth of focus of the optical signal passing through the receiving lens; and an analyzer analyzing emission spectrum image of the plasma field by receiving the optical signal passing through the aperture and the pinhole from the optical system main body. - View Dependent Claims (15, 16)
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17. An optical instrument comprising:
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an optical emission spectrometer for measuring a plasma field from an emission spectrum image of the plasma field, wherein the optical emission spectrometer comprises; a window for collecting the emissions spectrum and preventing the intensity reduction of the plasma field; a shielding filter which has a mesh structure capable of blocking RF electromagnetic waves radiated from the plasma field is used for wafer processing, positioned in the front of the optical window into which the emission spectrum of the plasma field is inputted, and collects charged particles passing through the mesh; a lens receiving a plasma emission spectrum passing through the shielding filter.
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Specification