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Semiconductor diode laser spectrometer arrangement and method

A diode laser, diode laser technology, used in semiconductor lasers, lasers, spectrometry/spectrophotometry/monochromators, etc., can solve problems such as limited applications

Inactive Publication Date: 2005-08-24
艾默生过程管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] It can be seen that existing spectrometers using semiconductor diode lasers, especially semiconductor diode laser spectrometers using quantum cascade lasers, have disadvantages that limit their use in the measurement of absorption spectra operated in a pulsed manner

Method used

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  • Semiconductor diode laser spectrometer arrangement and method
  • Semiconductor diode laser spectrometer arrangement and method
  • Semiconductor diode laser spectrometer arrangement and method

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Embodiment Construction

[0046] Spectrometers embodying the invention preferably use up-chirping of wavelengths exhibited by pulsed quantum cascade lasers and semiconductor lasers to provide wavelength scanning. Each individual pulse output by the laser provides a wavelength change, ie, a wavelength sweep, by means of an upward chirp of the wavelength. Up-chirping of this wavelength is induced by a heating effect that occurs throughout the duration of the applied current / voltage drive pulse. For these quantum cascade lasers, the upward chirp of the wavelength has shown its continuity. Specifically, under specific conditions of the electrically driven pulse shape (Optical Communications 197, 115 (2001)), the spectral behavior of pulsed quantum cascade lasers is characterized by the fact that the upward chirp of the wavelength with respect to time is almost linear. It can further be seen that, in pulsed operation, the spectral behavior of a quantum cascade laser can be mapped onto the temporal definit...

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Abstract

A method apparatus for sensing gases using a semiconductor diode laser spectrometer, the method comprising: introducing a sample gas into a non-resonant optical cell ( 17 ); applying a step function electrical pulse ( 19 ) to a semiconductor diode laser ( 20 ) to cause the laser ( 20 ) to output a continuous wavelength chirp for injecting ( 16 a) into the optical cell ( 17 ); injecting ( 16 a) the wavelength chirp into the optical cell ( 17 ); using the wavelength variation provided by the wavelength chirp as a wavelength scan, and detecting ( 23 ) light emitted from the cell ( 17 ), wherein a chirp rate is selected to substantially prevent light interference occurring in the optical cell ( 17 ).

Description

technical field [0001] The present invention relates to semiconductor diode laser spectrometer equipment, in particular to an infrared semiconductor diode laser spectrometer with time-resolved absorption characteristics, wherein the scale calibration of wavenumber is based on the mapping of time to wavenumber / cm-1. Background technique [0002] Infrared absorption spectrometers are used to detect and measure gases. Since these lasers are relatively small, spectrally well-defined, bright and tunable, infrared semiconductor diode lasers are widely used to provide light that can be absorbed by the substance being measured. These lasers have additional advantages over other lasers, some of which can be found in spectroscopic monographs. [0003] One of the most efficient and precise methods for trace gas detection at great distances and in harsh environments is the use of semiconductor diode laser based spectrometers. Although gas detection has been performed for decades, remo...

Claims

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Application Information

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IPC IPC(8): G01J3/42G01N1/00G01N21/03G01N21/39H01S5/00H01S5/34
CPCG01J3/4338G01N2021/399G01N21/39H01S5/3402B82Y20/00H01S5/06216H01S5/0622G01N21/031G01J3/42H01S5/34
Inventor 埃尔万·诺曼德奈杰尔·兰福德杰弗里·达克斯伯里
Owner 艾默生过程管理有限公司
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