Distributed Feedback (DFB) Lasers for Gas Sensing
- Technology
- Laser diodes
- Partner
- NEL / NTT Electronics
Distributed feedback (DFB) lasers for tuneable diode-laser spectroscopy (TDLS) are used to identify and measure gases in gaseous mixtures via near-infrared molecular absorption.
The wavelength range covers all relevant gases for chemical process control and climate change studies such as hydrogen fluoride (HF), water (H2O), ammonia (NH3), carbon monoxide (CO), hydrogen sulphide (H2S), methane (CH4), carbon dioxide (CO2).
Via temperature tuning the laser emission line is set to the dedicated gas wavelength. Thanks to the low width of the laser emission line, current swiping in the kHz range allows scanning over an individual absorption line obtaining e.g. the gas concentration and temperature.
Range features
A high level overview of what this range offers
Features
- Lasers are available in fibre-coupled butterfly packages allowing easy integration in transmission systems with reference gas cells
- Lasers are also available in TO5-cans with integrated temperature stabilsation mechanisms for free-space applications
- Wavelength range: 1250nm – 2330nm
- Linewidth: ~ 2MHz
- Output power: up to 20mW
- Temperature and current tuning
Package types
- 14-pin butterfly with fibre coupling
- TO5-can with integrated TEC
Applications
- Combustion control in power plants and waste incineration plants
- Control of blast furnaces in the metal industry
- Online gas analysis in the petrochemical industry
- Moisture content analysis in process gases e.g. of the semiconductor industry
- Leak detection in pipelines (e.g. methane)
- Detection of greenhouse gases
We have a vast range of passive fibre-optic devices such as splitters, collimators, lenses, and photodiodes for these applications.
What’s in this range?
All the variants in the range and a comparison of what they offer
| Model | Wavelength range | Power |
|---|---|---|
NLK1 | 1260 – 1690nm | 10 – 20mW |
KELD1 | 1735 – 2330nm | 2 – 10mW |
| Package option | Type |
|---|---|
AAA | Butterfly |
AYF | TEC5-can with TEC |
