Monolithic optical assembly

• US 6,141,101 A
• Filed: 04/26/1999
• Issued: 10/31/2000
• Est. Priority Date: 11/12/1997
• Status: Expired due to Term

• Current Assignee: PLX Incorporated
• Original Assignee: PLX Incorporated
• Inventors: Bleier, Zvi, Vishnia, Itai
• Primary Examiner(s): Kim, Robert H.
• Assistant Examiner(s): NATIVIDAD, PHILIP SANA
• Application Number:
  US09/298,871
• Time in Patent Office: 554 Days
• Field of Search: 356/346, 356/345, 356/358, 356/363, 356/244
• US Class Current: 356/451
• CPC Class Codes: G01B 2290/15 Cat eye, i.e. reflection always parallel to incoming beam
• CPC Class Codes: G01B 9/02051 Integrated design, e.g. on-chip or monolithic
• CPC Class Codes: G01B 9/02056 Passive reduction of errors
• CPC Class Codes: G01B 9/0209 Low-coherence interferometers
• CPC Class Codes: G01J 3/453 by correlation of the amplitudes
• CPC Class Codes: G02B 27/14 operating by reflection only
• CPC Class Codes: G02B 5/122 cube corner, trihedral or triple reflector type

Abstract

In accordance with the invention, an improved optical assembly having a monolithic structure is provided. The monolithic optical assembly is useful in interferometers to achieve a fringe effect in a Fourier transform spectrometer, and comprises top and bottom members which are joined into a monolithic structure by first and second support members and a beamsplitter. The assembly also comprising a first reflecting assembly in reflecting relation with the beamsplitter. An alternate embodiment of the invention has an added reflecting assembly in reflecting relation with the first reflecting assembly and the beamsplitter assembly, which allows for the use of multiple wavelength light sources to achieve a fringe effect in a Fourier transform spectrometer.

Claims

1. A monolithic optical assembly for use with an interferometer, comprising:

a top member;

a bottom member;

a first support member bonded to a first portion of said top member and to a first portion of said bottom member;

a second support member bonded to a second portion of said top member and to a second portion of said bottom member;

a first mirror assembly having at least one reflecting surface, wherein said first mirror assembly is bonded either to said first support member and said top member or said bottom member, or to said second support member and said top member or said bottom member; and

a beamsplitter assembly having a surface having a beamsplitter coating, said surface being in reflecting relation with said first mirror assembly, wherein said beamsplitter assembly is bonded to a third portion of said top member and to a third portion of said bottom member;

wherein said bonding of said first and second support members and said beamsplitter assembly to said top and bottom members creates a substantially stable, substantially vibration and shock resistant structure regarding said reflective relationship between said first mirror assembly and said beamsplitter assembly.

2. A monolithic optical assembly as recited in claim 1, comprising a third support member bonded to said second support member and to a fourth portion of said bottom member, and extending across an optical path of a radiation beam transmitted through said beamsplitter assembly.

3. An interferometer assembly, comprising:

a radiation source;

a first mirror assembly having at least one reflecting surface;

a monolithic reflecting structure having at least two reflecting surfaces in reflecting relation with said first mirror assembly, said monolithic reflecting structure, comprising;

a top member;

a bottom member;

a first support member bonded to a first portion of said top member and to a first portion of said bottom member;

a second support member bonded to a second portion of said top member and to a second portion of said bottom member;

a second mirror assembly having at least one reflecting surface, wherein said second mirror assembly is bonded either to said first support member and said top member or said bottom member, or to said second support member and said top member or said bottom member;

a beamsplitter assembly having a surface having a beamsplitter coating, said surface being in reflecting relation with said first and second mirror assemblies, wherein said beamsplitter assembly is bonded to a third portion of said top member and to a third portion of said bottom member;

wherein said bonding of said first and second support members and said beamsplitter assembly to said top and bottom members creates a substantially stable, substantially vibration and shock resistant structure regarding said reflective relationship between said second mirror assembly and said beamsplitter assembly; and

a radiation detector for detecting differences in the intensity variation of said radiation reaching said detector from said radiation source after leaving said beamsplitter assembly and reflecting off of said first and second mirror assemblies.

4. A retroreflector assembly as recited in claim 3, said monolithic reflecting structure further comprising a third support member bonded to said second support member and to a fourth portion of said bottom member, and extending across an optical path of said radiation transmitted through said beamsplitter assembly.

5. A monolithic optical assembly for use with an interferometer, comprising:

a top member;

a bottom member;

a first support member bonded to a first portion of said top member and to a first portion of said bottom member;

a second support member bonded to a second portion of said top member and to a second portion of said bottom member;

a third support member bonded to a third portion of said top member and to a third portion of said bottom member;

a first mirror assembly having at least one reflecting surface, wherein said first mirror assembly is bonded either to said first support member and said top member or said bottom member, or to said second support member and said top member or said bottom member; and

a beamsplitter assembly having a surface having a beamsplitter coating, said beamsplitter assembly bonded to either said top or bottom members of said monolithic optical assembly, so that said surface is in reflecting relation with said first mirror assembly;

wherein said bonding of said first, second and third support members to said top and bottom members creates a substantially stable, substantially vibration and shock resistant structure regarding said reflective relationship between said first mirror assembly and said beamsplitter assembly.

6. A monolithic optical assembly for use with an interferometer, comprising:

a top member;

a bottom member;

a first support member bonded to a first portion of said top member and to a first portion of said bottom member;

a second support member bonded to a second portion of said top member and to a second portion of said bottom member;

a third support member bonded to a third portion of said top member and to a third portion of said bottom member;

a first mirror assembly having at least one reflecting surface, wherein said first mirror assembly is bonded to said first support member and to a first portion of said bottom member;

a second mirror assembly having at least one reflecting surface in reflecting relation to said at least one reflecting surface of said first mirror assembly, said second mirror assembly being bonded to said second support member and to a second portion of said bottom member; and

a beamsplitter assembly having a surface having a beamsplitter coating, said beamsplitter assembly bonded to said top member and to a third portion of said bottom member, so that said surface is in reflecting relation with said first and second mirror assemblies;

wherein said bonding of said first, second and third support members to said top and bottom members creates a substantially stable, substantially vibration and shock resistant structure regarding said reflective relationship between said first mirror assembly, said second mirror assembly and said beamsplitter assembly.

7. A monolithic optical assembly as recited in claim 6, wherein said at least one reflecting surface of said first mirror assembly is optically flat.

8. A monolithic optical assembly as recited in claim 6, wherein said at least one reflecting surface of said second mirror assembly is optically flat.

9. A monolithic optical assembly as recited in claim 6, wherein said surface of said beamsplitter assembly is optically flat.

10. A monolithic optical assembly as recited in claim 6, wherein said top and bottom members, said first, second and third support members, said first and second mirror assemblies and said beamsplitter assembly are made of material having substantially the same coefficient of thermal expansion.

11. A monolithic optical assembly as recited in claim 6, wherein said surface of said beamsplitter assembly lies in a plane which is aligned at a substantially 45°

angle to second and third planes in which said at least one reflecting surfaces of said first and second mirror assemblies lie.

12. A monolithic optical assembly as recited in claim 11, wherein said second and third planes are substantially perpendicular to eachother.

13. A monolithic optical assembly as recited in claim 11, wherein said beamsplitter assembly comprises first and second panels, said first panel having a first surface and said second panel having a second surface, with said panels being joined together along said first and second surfaces.

14. A monolithic optical assembly as recited in claim 13, wherein said beamsplitter coating is located between said bonded together first and second panels of said beamsplitter assembly.

15. A monolithic optical assembly as recited in claim 11, said monolithic optical assembly further comprising a compensating panel bonded to a fifth portion of said bottom member and located between said first reflecting assembly and said beamsplitter assembly.

16. A monolithic optical assembly as recited in claim 15, wherein said surface of said beamsplitter assembly having said beamsplitter coating, faces said compensating panel.

17. An interferometer assembly, comprising:

a radiation source;

a first mirror assembly having at least one reflecting surface;

a monolithic reflecting structure having at least two reflecting surfaces in reflecting relation with said first mirror assembly, said monolithic reflecting structure, comprising;

a top member;

a bottom member;

a first support member bonded to a first portion of said top member and to a first portion of said bottom member;

a second support member bonded to a second portion of said top member and to a second portion of said bottom member;

a third support member bonded to a third portion of said top member and to a third portion of said bottom member;

a first mirror assembly having at least one reflecting surface, wherein said first mirror assembly is bonded to said first support member and to a first portion of said bottom member;

a second mirror assembly having at least one reflecting surface in reflecting relation to said at least one reflecting surface of said first mirror assembly, said second mirror assembly being bonded to said second support member and to a second portion of said bottom member; and

a beamsplitter assembly having a surface having a beamsplitter coating, said beamsplitter assembly bonded to said top member and to a third portion of said bottom member, so that said surface is in reflecting relation with said first and second mirror assemblies;

wherein said bonding of said first, second and third support members to said top and bottom members creates a substantially stable, substantially vibration and shock resistant structure regarding said reflective relationship between said first mirror assembly, said second mirror assembly and said beamsplitter assembly; and

a radiation detector for detecting differences in the intensity variation of said radiation reaching said detector from said radiation source after leaving said beamsplitter assembly and reflecting off of said first and second mirror assemblies.