Multi-wavelength intermediate infrared laser generation device based on periodically poled lithium niobate (PPLN) and control method thereof

Abstract

The invention discloses a multi-wavelength intermediate infrared laser generation device based on periodically poled lithium niobate (PPLN) and a control method thereof, and belongs to the field of laser technology. The multi-wavelength intermediate infrared laser generation device based on the PPLN comprises a pumping source generator, a signal source generator, a wavelength division multiplexer, a first focusing lens, a PPLN crystal, a second focusing lens, and a filter. The control method carries out sectional temperature control for the PPLN crystal, achieves generation and regulation for a multiple quasi-phase-matching (QPM) peak, then determines a fundamental frequency laser wavelength according to a quasi-phase matching principle, and obtains multi-wavelength intermediate infrared laser synchrotron radiation. According to the multi-wavelength intermediate infrared laser generation device and the control method, wide-range tuning output of multi-wavelength laser can be achieved just through changing of the temperatures of PPLN subsegment crystals; and according to actual application requirements, the temperatures of the subsegment crystals need to be flexibly set to enable the intermediate infrared laser wavelength to be in a target spectral line position, and the defect that the intermediate infrared wavelength cannot be in wide-range tuning in an existing method is overcome.

Description

technical field [0001] The invention discloses a PPLN-based multi-wavelength mid-infrared laser generating device and a control method thereof, belonging to the field of laser technology. Background technique [0002] Mid-infrared lasers have a wide range of applications in the fields of optical sensing, detection, and spectral analysis. Studies have shown that many important gas molecules (such as CH 4 , C 2 h 4 , CO, NH 3 , NO x , SO x etc.) There is a strong baseband absorption in the mid-infrared band of 3-5 microns, and its absorption intensity is 2-3 orders of magnitude higher than that in the near-infrared band. Since this kind of baseband absorption can reflect the intrinsic spectral properties of the gas and has fingerprint characteristics, the absorption spectroscopy technology based on mid-infrared laser can realize high-sensitivity detection of gas type, concentration and other information, which is extremely important in the field of environmental monitori...

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Problems solved by technology

However, these methods are mainly devoted to the design and optimization of new crystal domain structures, and there are problems such as difficulty in fabrication, high cost, and the shape of the QPM tuning curve is sensitive to device fabrication errors.

Not only that, once the crystal domain structure of this type of device is determined, the position of the QPM peak (that is, the wavelength of the mid-infrared laser) will be fixed accordingly, making it difficult to tune in a wide range

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