Multi-wavelength intermediate infrared laser generation device based on periodically poled lithium niobate (PPLN) and control method thereof
An infrared laser and generating device technology, applied in the laser field, can solve problems such as difficult production, difficult wide-range tuning, and sensitivity to device manufacturing errors, and achieve the effect of overcoming the inability to tune in a wide range and realizing a wide-range tuning output
Inactive Publication Date: 2013-06-12
NANJING UNIV OF INFORMATION SCI & TECH
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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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[0028] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.
[0029] Such as figure 1 As shown, the multi-wavelength mid-infrared laser generator based on PPLN includes: a pump source generator 1 with a wavelength of 1060nm, a signal source generator 2 with a wavelength of 1550nm, a wavelength division multiplexer 3, a first focusing lens 4, and a PPLN Crystal 5 , second focusing lens 6 , filter 7 . The output fiber of pump source generator 1 with a wave band of 1060nm and the output fiber of signal source generator 2 with a wave band of 1550nm are respectively connected to a wavelength division multiplexer 3 . A first focusing lens 4 , a PPLN crystal 5 , a second focusing lens 6 , and a filter 7 are sequentially arranged on the output optical path of the wavelength division multiplexer 3 .
[0030] The pump source generator 1 with a wavelength of 1060nm includes: 2N arrays of 1060nm lasers 11, a first fiber...
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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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IPC IPC(8): H01S3/106H01S3/10
Inventor 常建华杨镇博陆洲董时超
Owner NANJING UNIV OF INFORMATION SCI & TECH