Short pulse laser for product composition analysis and product composition analysis method

Abstract

The invention relates to a short pulse laser used for product component analysis and a product component analysis method. The short pulse laser comprises a driving power supply module and a laser module, wherein the driving power supply module comprises a power supply unit and a pulse generating unit; the laser module comprises a pulse level switching unit, a pulse current switch and a pulse laser unit; and an optical fiber pre-amplifier comprises an optical fiber wavelength division multiplexer, a pumping semiconductor laser, a first gain optical fiber, an optical fiber filter and a first optical fiber isolator. By adopting the short pulse laser and the analysis method, the pulse driving quality for the short pulse laser can be obviously improved, the special requirement for the cable connected between a driving module and a laser module is reduced, and the length of the cable can be obviously increased, so that the difficulty requirement of application in the aspect is reduced to the maximum extent, the technological progress is promoted, a better spectral characteristic can be obtained by adopting ultra-short pulse laser, the application is more convenient, and the short pulse laser is applicable to large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of metal detection, in particular to the technical field of metal component detection, in particular to a short-pulse laser for product component analysis and a product component analysis method. Background technique [0002] Today, pulsed semiconductor lasers are used in many fields. In many application fields, laser pulses need to be as short as tens of nanoseconds to several nanoseconds, or even lower, such as lidar, laser ranging, laser gas detection, laser excitation and detection in physics research, etc. Such applications are different from traditional communication laser applications under high-speed continuous modulation. Under short-pulse working conditions, it is generally necessary to provide a large pulse driving current to the laser, and the transient power consumption is large, but because the duty cycle is generally small, the average power consumption is generally not large. For some speci...

AI Technical Summary

Problems solved by technology

Mode-locked laser technology is the most common technology for obtaining ultrashort pulse laser output. It locks the longitudinal mode with a fixed phase relationship in the laser cavity to obtain ultrashort pulse output in terms of intensity, and can obtain extremely narrow pulse width. However, the repetition frequency of the laser pulse output in this way cannot be easily changed, and the mode-locking requires relatively harsh environmental conditions. Temperature changes and vibrations will affect the output of the mode-locked laser pulse.

Gain-switched semiconductor laser technology is to modulate the semiconductor laser with electrical pulses, and select the first peak of the relaxation oscillation of the semiconductor laser to obtain ultrashort pulse output. This technology can obtain ultrashort pulse output with adjustable repetition rate. However, the pulse width of the output laser pulse is wide and the power is very low

The laser intensity modulation technology uses a high-speed intensity modulator to modulate the intensity of the continuously output laser to obtain an ultrashort pulse output. The laser pulse repetition frequency obtained by this technology is adjustable, but the pulse width is wider and the output power is lower.

It can be seen that the above three existing technologies cannot simultaneously realize ultrashort pulse laser output with arbitrarily adjustable repetition frequency, high power, and high stability.

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