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Ytterbium-doped yttrium aluminium garnet multislab laser amplifier based on graded doping and cryogenic helium gas cooling

A laser amplifier and gradient doping technology, which is applied to lasers, laser components, phonon exciters, etc., to achieve the effects of reducing the aperture, facilitating thermal management, and improving the effective utilization rate

Inactive Publication Date: 2016-01-20
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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Problems solved by technology

However, this scheme is still limited to the active mirror structure, and there is no report on the structure of the graded doping stack amplifier

Method used

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  • Ytterbium-doped yttrium aluminium garnet multislab laser amplifier based on graded doping and cryogenic helium gas cooling
  • Ytterbium-doped yttrium aluminium garnet multislab laser amplifier based on graded doping and cryogenic helium gas cooling
  • Ytterbium-doped yttrium aluminium garnet multislab laser amplifier based on graded doping and cryogenic helium gas cooling

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Embodiment 1

[0044] In this example, the gain media 10-11 adopts 10 sheets with a diameter of 11cm×11cm and a thickness of 1.2cm with gradual doping (such as Figure 4 ) yttrium-doped yttrium aluminum garnet crystal, the front and rear surfaces of which are coated with anti-reflection coatings for pump light and seed light; the wrapping materials 12-13 are 3.5 cm wide and have an absorption coefficient of 0.66 cm-1 Tetravalent chromium-doped yttrium aluminum garnet crystals are glue-free bonded around the gain medium to ensure that at least 99% of the ASE light is absorbed to prevent the generation of parasitic oscillations; the gain medium 10-11 and the wrapping material 12 ~13 are installed on the blades 14~15 together; the sealing window adopts sapphire crystal, and its front and rear surfaces are also coated with anti-reflection film for pump light and seed light, so as to ensure the cleanliness of the film cavity and maintain the cavity Internal pressure; the interval between the gain...

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Abstract

The invention provides a ytterbium-doped yttrium aluminium garnet multislab laser amplifier based on graded doping and cryogenic helium gas cooling. The laser amplifier includes a pump module, a coupling lens module, a dichroic mirror module and a gain medium module. The gain medium module adopts a combined slab graded-doping laser gain medium and is arranged perpendicular to the direction of the laser. The pump module includes a planar diode array pump source I and a planar diode array pump source II, which are respectively arranged on two sides of the gain module and used for pumping the end faces of the gain module. According to the invention, by means of the combined slab graded-doping laser gain medium, the varied-doping edge-package medium, the diode end face pumping and the cryogenic high-pressure helium active cooling, the amplified spontaneous emission is effectively reduced, the generation of the parasitic oscillation is prevented, the efficiency of the energy storage is improved, the generation of the waste heat is reduced, the temperature distribution in the medium is smoothed, and the effect of the heat management is further improved, so that the laser output of high repetition frequency, high-energy high-power and high light beam quality is achieved.

Description

technical field [0001] The invention belongs to the technical field of laser amplifying devices, in particular to an ytterbium-doped yttrium aluminum garnet lamination laser amplifier cooled by gradually doped low-temperature helium gas. Background technique [0002] The energy crisis is a common challenge facing human development, and inertial fusion energy (IFE) is recognized as a safe, carbon-free and sustainable clean energy. Inertial fusion energy has been studied for more than 50 years. As a long-term solution to human energy and a method to create extreme physical conditions, it has strong appeal. Driven by the demand for laser fusion, countries have successively built a series of large-scale high-power laser drive devices, such as the National Ignition Facility (NIF) in the United States, the Megajoule Device (LMJ) in France, and the Shenguang Series Device (SG) in my country, etc. . The establishment of NIF and the launch of national ignition research marks that th...

Claims

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Application Information

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IPC IPC(8): H01S3/042H01S3/0941H01S3/16
Inventor 肖凯博郑建刚郑万国蒋新颖严雄伟王振国李敏张君田晓琳张雄军李明中袁晓东粟敬钦胡东霞朱启华
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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