Optical cavity for absorption spectroscopy and methods of assembly

A cell for an optical cavity, the cell comprising:

• at least one structure with a first end and a second end;
• a first end-cap attached to the at least one structure at the first end and having an opening with a center axis and a clamping structure adjacent a receptacle configured to receive the first end of the at least one structure, the first end-cap being attached to the at least one structure by the clamping structure and clamping hardware;
• and
• a second end-cap attached to the at least one structure at the second end and having an opening with a center axis that is axially aligned with the center axis of the first end-cap and a clamping structure adjacent to a receptacle configured to receive a second end of the at least one structure, the second end-cap being attached to the at least one structure by the clamping structure and clamping hardware.

A cell for an optical cavity, the cell comprising:

• at least one structure with a first end and a second end;
• a first end-cap attached to the at least one structure at the first end and having an opening with a center axis;
• and
• a second end-cap attached to the at least one structure at the second end and having an opening with a center axis that is axially aligned with the center axis of the first end-cap,
• wherein the at least one structure comprises a plurality of rods, each off axis from the center axis of the first end-cap and the center axis of the second end-cap.

An optical cavity comprising:

• at least one structure with a first end and a second end;
• a first end-cap attached at the first end and having an opening with a center axis and at least one receptacle off axis from the center axis and configured to receive the first end;
• a second end-cap attached at the second end and having an opening with a center axis and at least one receptacle off axis from the center axis and configured to receive the first end, the center axis optically aligned with the center axis of the first end-cap;
• a first mirror removably coupled with the first end-cap by a first mirror clamp assembly such that the center of the first mirror is axially aligned with the center axis of the first end-cap;
• and
• a second mirror removably coupled with the second end-cap by a second mirror clamp assembly such that the center of the second mirror is axially aligned with the center axis of the second end-cap.