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3.9 mu m mid infrared laser

A laser and laser technology, applied to the structure/shape of optical resonators, active dielectric materials, etc., can solve the problems of large loss of sensitized ions, low quantum efficiency, complex structure, etc., achieve simple structure, reduce overall machine cost, Adjust the effect of difficulty reduction

Inactive Publication Date: 2012-11-28
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

The pumping source of the mid-infrared optical parametric oscillator is a 2μm laser. There are three main ways to obtain a 2μm laser: LD pumping single-doped Tm 3+ Crystal, there is an up-conversion effect in this way, the quantum efficiency is relatively low, and the thermal effect is serious; LD pumps Tm 3+ , Ho 3+ Co-doped crystal, Tm 3+ ions as sensitizing ions solve the Ho 3+ Ions have no absorption peak problem in the ordinary LD wavelength range, but sensitized ions will bring large losses, which greatly reduces the overall efficiency of the laser; Tm 3+ Laser Pumped Ho 3+ Laser, this method not only reduces the up-conversion effect, but also does not have the loss of sensitized ions, but requires the 2.1 μm laser generated by the simultaneous operation of two lasers as the mid-infrared pumping source, and the structure is relatively complicated

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  • 3.9 mu m mid infrared laser

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Embodiment Construction

[0013] Such as figure 1 As shown, the 3.9 μm mid-infrared laser of the present invention includes: LD fiber coupling system, 3.9 μm Ho: BYF laser resonator. More specifically, the present invention consists of the following devices (from left to right):

[0014] LD pump source 1, the output wavelength is 889nm, and the output 889nm laser radius is 400μm; the coupling lens group 2, which includes two plano-convex lenses with focal lengths of 35mm and 75mm, respectively, coated with 889nm anti-reflection coating to reduce the pump light Loss, through the coupling lens group 2, the radius of the pump light when it reaches the working substance is 800 μm; the flat lens 3 is coated with a 3.9 μm high-reflective dielectric film with a reflectivity greater than 99.5% and an 889nm high-transmittance two-color medium with a transmittance greater than 90% Film; holmium-doped yttrium barium fluoride crystal 4, the doping concentration is 30%, cut at the Brewster angle, the a-axis is alo...

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Abstract

The invention discloses a 3.9 mu m mid infrared laser, relates to a laser, and in particular relates to a 889nm LD pump 3.9 mu m Ho:BYF laser. By adoption of an LD pump high doping concentration Ho:BYF crystal mode, 3.9 mu m mid infrared laser output is obtained in a resonant cavity. Due to the overall design, the structure is greatly simplified, the loss brought by the up-conversion effect and ion sensitization is avoided, and the beam quality and stability of the laser output are improved. The laser is applied to technical research of mid infrared lasers, and the application fields comprise photoelectric countermeasure, environmental monitoring, laser radar, laser medical treatment and spectroscopy research.

Description

technical field [0001] The invention relates to a 3.9 μm mid-infrared laser, in particular to an 889nm LD pumped 3.9 μm Ho: BYF laser. It is suitable for research on mid-infrared laser technology, and its application fields include photoelectric countermeasures, environmental monitoring, lidar, laser medical treatment, and spectroscopy research. Background technique [0002] Mid-infrared lasers are widely used in the fields of lidar, laser medical treatment, photoelectric countermeasures, environmental monitoring and spectroscopy research. In some fields, high peak power, high beam quality, high repetition rate and narrow linewidth are required. Compared with other types of lasers, solid-state lasers are easier to meet the above requirements, and the reactive heat disturbance of laser oscillation is small, and can be made into light, compact, and high-efficiency devices, which can meet the requirements of technical indicators in various fields. [0003] Scholars at home an...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/16H01S3/08
Inventor 金光勇别佳奇陈薪羽于永吉王超
Owner CHANGCHUN UNIV OF SCI & TECH
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