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Applications | CW quantum cascade lasers
Gas analysis
A Distributed feedback (DFB) laser has a superior capability of spectral resolution, and it enable to detect a single and separated absorption line of gas phase molecules.
Advantages using the QCL
- High spectral resolution: Selective detection of gas species
- Less infringement by ambient gases: No required preprocessing like dehumidification
- To measure up to Lambert-Beer law well: High precision measurement
- Possible to consist a configuration no mechanical moving part required
- In-Situ measurement for process control
TDLAS carry out high throughput gas sensing with outstanding sensitivity
Tunable diode laser absorption spectroscopy (TDLAS) is a spectroscopic technique with semiconductor laser.
Saw-tooth current (Ramp wave) injection enables tuning emission wavelength of QCL by the variable feature of DFB laser's emission depending on the operating temperature and injection current level.
Also, TDLAS performs high sensitive spectroscopy with lock-in amplifier to detect periodical modulation of lasers.
Configuration of TDLAS
Optical heterodyne detection
It is called Heterodyne detection to read out the frequency of beat-note generated by optical interference.
A frequency of beat-note comes higher when the emission wavelength of two lasers are far way, therefore, the photodetectors with high response frequency are required to detect beat-note covering broader wavelength range.
Hamamatsu photonics offers appropriate components to perform Heterodyne detection: QCD which has MIR sensitivity and high response feature, high stable QCL, and CW controller with ultra-low noise characteristic.
What is beat-note
Two coherent light sources (i.e. lasers) generate the beat signal corresponding to the difference of frequency when these light sources have close, but slightly different wavelength.
This beat signal is called optical beat or beat-note, and the freaquency of beat-note is called beat-note frequency. Beat-note reflect sensitively the variation of the intensity, phase, or frequency of the laser which compose the beat-note.
Therefore, beat-note is broadly used in the techniques such as a high sensitive, or high wavelength resolve spectroscopy.
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