Photonic article, process for making and using same

1. An article comprising:

a substrate;

a reference optical cavity disposed on the substrate and comprising a reference cavity, the reference optical cavity being configured to support a reference optical resonance and to maintain an axial length of the reference cavity; and

a sample optical cavity disposed on the substrate and comprising a sample cavity, the sample optical cavity being configured to support a sample optical resonance and to maintain an axial length of the sample cavity.

2. The article of claim 1 , wherein the reference optical cavity further comprises:

a first reference cavity mirror disposed at a first end of the reference cavity; and

a second reference cavity mirror disposed at a second end of the reference cavity and opposing the first reference cavity mirror, wherein the reference optical cavity is configured to receive a reference gas disposed in the reference cavity and interposed between the first reference cavity mirror and the second reference cavity mirror.

3. The article of claim 2 , wherein the sample optical cavity further comprises:

a first sample cavity mirror disposed at a first end of the sample cavity; and

a second sample cavity mirror disposed at a second end of the sample cavity and opposing the first sample cavity mirror, wherein the sample optical cavity is configured to receive a sample gas disposed in the sample cavity and interposed between the first sample cavity mirror and the second sample cavity mirror.

4. The article of claim 3 , further comprising a reference gas path in gas communication with the reference cavity and configured to provide the reference gas to the reference optical cavity.

5. The article of claim 3 , further comprising a sample gas path in gas communication with the sample cavity and configured to provide the sample gas to the sample optical cavity.

6. The article of claim 3 , further comprising a secondary sample optical cavity disposed on the substrate.

7. The article of claim 6 , wherein the secondary sample optical cavity comprises:

a secondary sample cavity disposed on the substrate; and

a primary mirror disposed at a first end of the secondary sample cavity; and

a secondary mirror disposed at a second end of the secondary sample cavity and opposing the primary mirror, wherein the secondary sample optical cavity is configured to receive a secondary sample gas disposed in the secondary sample cavity and interposed between the primary mirror and the secondary mirror.

8. An article comprising:

a first substrate;

a second substrate spaced apart from the first substrate and opposingly disposed to the first substrate;

a plurality of first mirrors disposed on the first substrate;

a plurality of second mirrors disposed on the second substrate;

a variable length member interposed between the first substrate and the second substrate and comprising an internal hollow portion;

a reference optical cavity configured to support a reference optical resonance and comprising:

a reference cavity; and

a first pair of mirrors comprising:

one of the first mirrors; and

one of the second mirrors, such that the first pair of mirrors is opposingly arranged to one another, and the reference cavity is interposed between the first pair of mirrors and comprises the internal hollow portion; and

a sample optical cavity configured to support a sample optical resonance and comprising:

a sample cavity; and

a second pair of mirrors, different from the first pair of mirrors, and comprising:

one of the first mirrors; and

one of the second mirrors, such that the second pair of mirrors is opposingly arranged to one another, and the sample cavity is interposed between the second pair of mirrors.

9. The article of claim 8 , wherein a length of the sample cavity is selectively adjustable, and a length of the reference cavity is selectively adjustable.

10. The article of claim 9 , wherein the reference optical cavity is configured to receive a reference gas disposed in the reference cavity and interposed between first pair of mirrors.

11. The article of claim 10 , wherein the sample optical cavity is configured to receive a sample gas disposed in the sample cavity and interposed between the second pair of mirrors.

12. The article of claim 11 , further comprising a reference gas path in gas communication with the reference cavity and configured to provide the reference gas to the reference optical cavity.

13. The article of claim 12 , further comprising a sample gas path in gas communication with the sample cavity and configured to provide the sample gas to the sample optical cavity.

14. The article of claim 13 , further comprising a secondary sample optical cavity comprising:

a secondary sample cavity; and

a third pair of mirrors comprising:

one of the first mirrors; and

one of the second mirrors, such that the third pair of mirrors is opposingly arranged to one another, and the secondary sample cavity is interposed between the third pair of mirrors, wherein the secondary sample optical cavity is configured to receive a secondary sample gas disposed in the secondary sample cavity and interposed between the third pair of mirrors.

15. A process for determining a sample condition, the process comprising:

introducing a reference light to a reference cavity;

adjusting the reference light to the reference cavity;

transmitting the reference light from the reference cavity;

introducing a sample light to a sample cavity;

adjusting the sample light to the sample cavity;

transmitting the sample light from the sample cavity;

detecting the sample light;

providing feedback for locking the reference light to the reference cavity;

providing feedback for locking the sample light to the sample cavity;

combining the reference light with the sample light;

detecting a beat frequency, based on the reference light and the sample light; and

determining a sample condition, based on the beat frequency.

16. The process of claim 15 , wherein the sample condition comprises pressure, temperature, or refractive index.

17. A process for determining a sample condition, the process comprising:

introducing a reference light to a reference cavity;

adjusting the reference light to the reference cavity;

transmitting the reference light from the reference cavity;

introducing a sample light to a sample cavity;

adjusting the sample light to the sample cavity;

transmitting the sample light from the sample cavity;

detecting the sample light;

providing feedback for locking the reference light to the reference cavity;

providing feedback for locking the sample light to the sample cavity;

combining the reference light from the reference cavity with the sample light from the sample cavity;

detecting a beat frequency, based on the reference light in the sample light; and

determining a sample condition comprising a pressure of the sample gas, a temperature of the sample gas, or a refractive index of the sample gas.

18. The process of claim 17 , wherein the secondary condition comprises a pressure, a temperature, or a refractive index.