MgF.sub.2 Coating for promoting adherence of thin films to single crystal materials

• US 4,336,982 A
• Filed: 08/04/1980
• Issued: 06/29/1982
• Est. Priority Date: 08/04/1980
• Status: Expired due to Term

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Rector, Malcolm B. Jr.
• Primary Examiner(s): Sikes, William L.
• Application Number:
  US06/174,972
• Time in Patent Office: 694 Days
• Field of Search: 350/358, 350/353, 350/354-356
• US Class Current: 359/285
• CPC Class Codes: G02F 1/0305 Constructional arrangements G02F1/0327 - G02F1/05 take precedence
• CPC Class Codes: G02F 1/11 based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves acousto-optical deflection G02F1/33

Abstract

A thin layer of MgF₂ is deposited on cleaned surfaces of a single crystal material substrate to promote the adhesion of both a transducer and antireflection coating overlying the MgF₂ layer to the underlying substrate.

Claims

1. An acousto-optic device comprising:

a single crystal material having at least first and second surfaces;

a transducer element;

an adhesion promoting layer of magnesium fluoride overlying said first crystal surface;

a layer of bonding material interposed between said transducer element and said adhesion promoting layer; and

means for electrically driving said transducer element whereby an elastic wave is produced in said crystal material.

2. The device as defined in claim 1 further including a layer of magnesium fluoride interposed between said second crystal surface and an anti-reflection coating.

3. The device as defined in claim 1 wherein said crystal material comprises tellerium oxide.

4. The device as defined in claim 3 wherein said anti-reflection coating comprises silicon dioxide.

5. The device as defined in claim 1 wherein said driving means comprises a layer of conductive material interposed between said transducer element and said layer of bonding material.

6. An electro-optic device comprising:

a single crystal material having at least first and second surfaces;

a plurality of electrode elements;

an adhesion promoting layer of magnesium fluoride overlying said first crystal surface;

a layer of silicon dioxide interposed between said layer of MgF₂ and said plurality of electrodes;

a layer of magnesium fluoride interposed between said second crystal surface and an anti-reflection layer; and

means for electrically driving said electrode elements.