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Continuous laser drive device and method

A driving method and laser technology, applied to lasers, laser components, semiconductor lasers, etc., to achieve fast response speed, ensure system stability, and reduce response speed requirements

Active Publication Date: 2015-09-02
FOCUSED PHOTONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the above reasons, there is no quantum cascade laser gas analysis system that can be applied to the process industry in the world so far.

Method used

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  • Continuous laser drive device and method

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Experimental program
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Effect test

Embodiment 1

[0039] figure 1 A basic structure diagram of a continuous laser drive device according to an embodiment of the present invention is schematically given. like figure 1 As shown, the drive unit includes:

[0040] A current source, the current source is used to output an operating current to the continuous laser, such as a rectangular wave electrical signal, a triangular wave electrical signal, a sine wave electrical signal, and the like. The current source is a prior art in this field, and will not be repeated here. Optionally, the continuous laser is a quantum cascade laser, and the continuous laser can be packaged in TO-3 or HHL. The continuous laser can also be a conventional semiconductor laser, such as VCSEL, DFB and other semiconductor lasers, which is easily understood by those skilled in the art.

[0041] A control module, the control module is used to adjust the intermittent time and output time (corresponding to the light output time of the laser) of the current so...

Embodiment 2

[0059] According to the application example of the driving device and method in embodiment 1 of the present invention in a laser gas analyzer, specifically, the quantum cascade laser gas analyzer is used to measure SO in a sulfuric acid plant. 2 concentration. The sample gas in this working condition contains SO 2 , SO 3 Such as acid gas and moisture, the pretreatment system used in the traditional sampling instrument is severely corroded in this place, and leakage will occur in severe cases. Moreover, when the sample gas is transported in the sampling pipeline, crystals will precipitate out, causing the sampling system to often be blocked. Therefore, the use of in-situ measurement laser gas analyzers has outstanding advantages in this working condition. However, traditional near-infrared laser gas analyzers cannot effectively measure SO 2 and other gases, so a quantum cascade laser gas analyzer working in the infrared band was used to measure the SO in the sulfuric acid p...

Embodiment 3

[0073] The application example of the driving device and method according to Embodiment 1 of the present invention in a laser gas analyzer is specifically applied in the measurement of escaped ammonia in a denitrification device.

[0074] Reduce NO x Emissions are one of the main tasks of environmental protection and prevention. Now, a certain amount of NH is generally injected before the flue gas is discharged. 3 with NO x reaction to generate environmentally friendly N 2 and H 2 O to reduce NO x emissions. But in this denitrification process, excess NH 3 The amount of (slip ammonia) needs to be precisely monitored and controlled to avoid excess NH 3 It will lead to secondary environmental pollution and affect the normal operation of denitrification equipment in severe cases.

[0075] However, the temperature of the denitrification process point is high (about 380°C), and the dust is high (dust content 10-50g / Nm 3 ), high humidity (water vapor content 10-20%), NH 3 ...

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Abstract

The invention provides a continuous-laser driving device, which comprises a current source used for outputting working current to a continuous laser and further comprises a control module used for regulating the break time and output time for the current source to output working current to the continuous laser within one work cycle, the output time ranges from 1ms to 50ms, and the duty cycle is 1-5 percent. The continuous-laser driving device provided by the invention has the advantages of strong environmental adaptation, convenience in maintenance, low cost and the like.

Description

technical field [0001] The invention relates to the driving of lasers, in particular to a driving device and method of continuous lasers. Background technique [0002] Because quantum cascade lasers work in the mid-infrared band and cover the strong fundamental frequency absorption of most organic and inorganic small molecules, they have broad application prospects. Laser gas analyzers are one of their typical applications. However, since the advent of quantum cascade lasers, their low electro-optical conversion efficiency and high heat generation have limited their applications. Therefore, improving the conversion efficiency of quantum cascade lasers has always been the focus of research and application of quantum cascade lasers. [0003] In the application of quantum cascade lasers, a narrow pulse driving method (tens to hundreds of nanoseconds) is generally used at present, so as to shorten the light-emitting time of the laser and reduce the equivalent calorific value of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/34H01S5/042
Inventor 邓文平顾海涛俞大海章瑜
Owner FOCUSED PHOTONICS
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