Patent ID: 9625702
Date: 2017-04-18
CPC Classifications: G01J,G02B

Claim:
1. A coupled-cavity ring-down spectrometer apparatus comprised of: at least one input recycle cavity which is comprised of at least one first primary ring-down mirror, at least one movable input recycling mirror and at least one input coupling mirror, wherein said at least one first primary ring-down mirror, said at least one movable input recycling mirror and said at least one input coupling mirror have a quantified reflectivity value; said at least one input coupling mirror positioned at a first angle of reflection relative to said at least one first primary ring-down mirror to produce a first target reflectivity value and wherein said first angle of reflection is relative to said at least one first primary ring-down mirror and is a function of said first target reflectivity value; said at least one movable input recycling mirror having a second target reflectivity value wherein said at least one movable input recycling mirror is positioned at a second angle of reflection relative to said at least one first primary ring-down mirror to produce said second target reflectivity value and wherein said second angle of reflection is a function of said second target reflectivity value; at least one output recycle cavity formed by at least one second primary ring-down mirror, at least one output coupling mirror and at least one movable output recycling mirror; at least one primary ring-down cavity formed between said at least one input recycle cavity and said at least one output recycle cavity; and at least one resonator operatively coupled with at least one piezoelectric transducer wherein said at least one piezoelectric transducer receives electrical signals from said at least one resonator to actuate movement of said at least one movable input recycling mirror and said at least one movable output recycling mirror; and at least one sensor which continuously measures a finesse of said at least one output recycle cavity.