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A mid-infrared laser based on the difference frequency of alkali metal laser

An alkali metal and laser technology, applied in the field of lasers, can solve the problems of large loss in the cavity, poor beam quality, complex cavity structure, etc., and achieve the effect of good mode matching and large line width.

Active Publication Date: 2021-04-23
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, to achieve mid-infrared output through difference frequency technology, two beams of seed light are required, the cavity structure is complex, and the loss in the cavity is large
In addition, the currently commonly used seed sources are all solid-state lasers, and the gain medium is solid. The thermal lens effect is obvious at high-power laser output, and the beam quality of the output light becomes poor at high pump power densities. It is difficult to achieve high-power mid-infrared laser

Method used

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  • A mid-infrared laser based on the difference frequency of alkali metal laser
  • A mid-infrared laser based on the difference frequency of alkali metal laser
  • A mid-infrared laser based on the difference frequency of alkali metal laser

Examples

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Embodiment 1

[0021] Example 1: as figure 1 As shown, the mid-infrared laser of this embodiment includes a high-reflection mirror 1, a semiconductor laser 2, an off-axis parabolic mirror 3, an alkali metal gas chamber 4, a first temperature-controlled furnace 5, a dichroic mirror 6, a neodymium-doped yttrium vanadate (Nd :YVO 4 ) crystal 7, trichromatic mirror I8, magnesium-doped periodically polarized lithium niobate (MgO:PPLN) crystal 9, second temperature-controlled furnace 10 and trichromatic mirror II11. The fundamental frequency light used for difference frequency generation in the mid-infrared consists of an alkali metal laser and an alkali metal laser-pumped neodymium-doped laser.

[0022] Among them, the surface of the high-reflection mirror is coated with a dielectric film, and the dielectric film has a high reflectivity to the alkali metal laser, the reflectivity is generally 99.8%, and the preferred value is 99.99%, forming a plano-concave resonator of the alkali metal laser wi...

Embodiment 2

[0042] Example 2: On the basis of Example 1, the alkali metal vapor chamber 4 can also be filled with other buffer gases or components, such as helium, ethane and other gases, so long as the alkali metal atoms in the vapor chamber are pumped. The particle number inversion can be achieved under the action of light.

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Abstract

The invention proposes a mid-infrared laser based on the difference frequency of an alkali metal laser, which has the characteristics of high power, high efficiency and low threshold. The laser of the present invention generates mid-infrared laser light based on the difference frequency technology. The fundamental frequency light used for the difference frequency consists of an alkali metal laser and its pumped neodymium-doped laser. Since the signal light is generated by the alkali metal laser pumping, the signal light and the alkali metal laser have the characteristic of co-optical axis. When the difference frequency is performed, it has better mode matching and can output the mid-infrared laser with high efficiency. Compared with the optical parametric oscillator and the optical parametric amplifier, the laser of the invention has the characteristics of low threshold value and narrow line width. This is because the signal light of the patent of the present invention is generated by the alkali metal laser pumping the neodymium-doped crystal, and both OPO and OPA generate the signal light through a nonlinear process under high gain. Compared with the two, OPO and OPA require higher thresholds and have larger line widths.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a mid-infrared laser based on the difference frequency of an alkali metal laser. Background technique [0002] In recent years, the application of mid-infrared laser detectors has become more and more extensive, especially in the mid-infrared band of 3 to 5 μm, which has strong penetrating ability to smoke and atmosphere, and has broad application prospects in gas detection. At present, there are many types of lasers that can output this band. Among them, the mid-infrared laser that uses frequency conversion output is one of the main methods. For example, in 2018, Zhu Renjiang and others used two beams of light with tuning ranges of 949-957nm and 1071-1106nm, respectively. The mid-infrared band with a tuning range of 6.7-9.0 μm is output through intracavity difference frequency technology. Compared with other methods of generating mid-infrared beams by frequency conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/0941H01S3/091H01S3/108
CPCH01S3/091H01S3/0941H01S3/108
Inventor 李志永胡列懋谭荣清刘松阳宁方晋
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI