US 2026/0276540 A1 · Integrated cat's-eye tunable laser spectroscopy system and method

Abstract

A spectroscopy system comprises a tunable laser including a gain chip, a collimating lens for collimating light from the gain chip, an end reflector, a focusing lens for focusing the collimated light on the end reflector, a thin film bandpass filter between the collimating lens and the focusing lens, and an angle control actuator for changing the angle of the thin film filter to the collimated light. The light from the laser is coupled into a sample cell providing a sample. An amplitude detector detects light from the tunable laser prior to passing into the sample cell and a sample detector detecting light from the tunable laser after passing through the sample cell. A processor controls the angle control actuator and monitors a time response of the sample detector and the amplitude detector to resolve an absorption spectra of the sample.

Claims14

Dependent claims

A method of sweeping a wavelength of a tunable laser spectrometer, the method comprising:

providing a tunable laser comprising a gain chip in a laser cavity, a thin film bandpass filter in the laser cavity, an angle control actuator coupled to the thin film bandpass filter, and an encoder coupled to the angle control actuator;
storing a tuning function defining a target angle of the thin film bandpass filter as a function of time;
generating an angle signal with the encoder;
comparing, with a PID controller, the angle signal to the stored tuning function to produce a control signal;
and
applying the control signal to the angle control actuator to drive the thin film bandpass filter through a wavelength sweep of the tunable laser to sweep through a scanband of the spectrometer.

3 more elements

Dependencies are inferred from the claim text.

Integrated cat's-eye tunable laser spectroscopy system and method

Life of this patent

Integrated cat's-eye tunable laser spectroscopy system and method

Life of this patent

Abstract

Claims14