Direct flow cell mountable spectroscopy system with internal gas cell
Tunable or swept cat's-eye lasers for spectroscopy that is adapted for direct mounting to a flow cell and/or includes an internal gas cell.
1 . A tunable laser spectroscopy system, comprising:
a base including a port through the base;
a tunable laser implemented on the base; and
kinematic mount installed on the base and carrying a mirror;
wherein an output beam from the tunable laser is reflected by the mirror to travel through the port to a flow cell.
2 . The tunable laser spectroscopy system as claimed in claim 1 , wherein the laser includes a gain chip mounted on a thermoelectric cooler within a butterfly package.
3 . The tunable laser spectroscopy system as claimed in claim 1 , further comprising an amplitude reference beamsplitter for reflecting a portion of the light to an amplitude reference detector.
4 . The tunable laser spectroscopy system as claimed in claim 1 , wherein the kinematic mount includes adjustment bolts for adjusting the tip and tilt of the mirror in two axes of the kinematic mount.
5 . The tunable laser spectroscopy system as claimed in claim 1 , further comprising a sample detector assembly for holding a sample detector for detecting the output beam after being modulated by the sample in the flow cell.
6 . The tunable laser spectroscopy system of claim 1 , wherein the gain chip is InP and provides gain in the 1200 to 1800 nm band.
7 . The tunable laser spectroscopy system of claim 1 , wherein the system is intended to quantify the concentration of methane.
8 . The tunable laser spectroscopy system of claim 1 , wherein the base is a metal plate.
9 . A tunable laser spectroscopy system, comprising:
a tunable laser;
an optical bench including a amplitude reference detector, and a wavelength reference detector; and
a gas cell before the wavelength reference detector.
10 . The tunable laser spectroscopy system of claim 9 , wherein the gas cell contains methane.
11 . The tunable laser spectroscopy system of claim 1 , wherein the base is configured to be mounted directly to a flow cell assembly.
12 . The tunable laser spectroscopy system of claim 11 , wherein the base is directly bolted to the flow cell assembly.
13 . The tunable laser spectroscopy system of claim 11 , wherein the base and the flow cell assembly form an air-tight seal.
14 . The tunable laser spectroscopy system of claim 11 , wherein the base and the flow cell assembly form a liquid-tight seal.
15 . The tunable laser spectroscopy system of claim 1 , further comprising an output mirror assembly including a bracket bolted to the base.
16 . The tunable laser spectroscopy system of claim 15 , wherein the bracket forms a U-shaped bridge extending over the output beam.
17 . The tunable laser spectroscopy system of claim 15 , wherein the kinematic mount is held by the bracket.
18 . The tunable laser spectroscopy system of claim 5 , wherein the sample detector assembly is arranged on an opposite side of the flow cell from the base such that the output beam passes through the flow cell before reaching the sample detector.
19 . The tunable laser spectroscopy system of claim 9 , further comprising a gas cell beamsplitter positioned in an output beam path and configured to reflect a portion of the output beam into the gas cell, and a gas cell detector positioned to detect light transmitted through the gas cell, wherein the gas cell contains methane and absorption spectra produced by the gas cell are compared to sample spectra to perform wavelength calibration.