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Self-calibration method for thermal deformation of distorting lens under effect of high-power continuous laser irradiation

A technology of laser irradiation and deformable mirror, applied in the field of strong laser technology and adaptive optics

Active Publication Date: 2015-12-23
SICHUAN UNIV
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Problems solved by technology

[0010] The purpose of the present invention is to overcome the existing defects and deficiencies in the prior art, and to provide a self-correction method for thermal deformation of deformable mirrors under high-power continuous laser irradiation. , without using heat exchange measures and without changing the structural parameters of the deformable mirror, a set of driver control signals that change with time are used to adjust the thermally deformed surface of the deformable mirror in real time, thereby realizing real-time thermal deformation of the deformable mirror compensate

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  • Self-calibration method for thermal deformation of distorting lens under effect of high-power continuous laser irradiation
  • Self-calibration method for thermal deformation of distorting lens under effect of high-power continuous laser irradiation
  • Self-calibration method for thermal deformation of distorting lens under effect of high-power continuous laser irradiation

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Embodiment

[0076] The deformable mirror used in this embodiment is a discrete drive type deformable mirror, and its structure is as follows Figure 4 Shown in middle (a); include the film 8 on the surface of the deformable mirror, the mirror surface 9, the pole head 10, the driver 11 and the base 12; its film film structure is: Sub / (HL) 11 H / Air, where Sub means silicon substrate, H means ZnS film, L means YbF 3 thin film, at a central wavelength λ 0 =3.8 μm under normal laser incidence conditions, the film system absorption rate is 109ppm; the diameter of the deformable mirror mirror surface 9 is 180mm, the thickness is 2.5mm, and the material is single crystal silicon; the deformable mirror pole head 10 is a driver 11 The connection unit between the mirror surface 9 is made of monocrystalline silicon, and the diameter of a single pole head is 8 mm, and the length is 10 mm; the driver 11 is the main device for controlling the shape of the deformed mirror surface, and its material is pi...

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Abstract

The invention relates to a self-calibration method for the thermal deformation of a distorting lens under the effect of high-power continuous laser irradiation and belongs to the technical field of strong laser techniques and adaptive optics. According to the technical scheme of the invention, the thermally deformed surface shape of a distorting lens is self-calibrated. That means, without adopting any heat-exchange measure or changing the structural parameters of the distorting lens, the thermally deformed surface shape of the distorting lens is adjusted in real time by means of a set of driver control signals that are varying along with the time, so that the real-time compensation on the thermally deformed surface shape of the distorting lens is realized. The self-calibration method is applicable to the self-calibration for the thermal deformation of distorting lenses having different laser parameters and under the effects of different laser irradiation time periods. The calibration effect of the self-calibration method is prevented from getting deteriorated along with the increasing of the incident laser power and the laser irradiation time. Meanwhile, the self-calibration method is not dependent on any extra device and can realize the self-calibration function for the thermal deformation of existing discrete drive type distorting lenses.

Description

technical field [0001] The invention relates to a technology for controlling a deformable mirror to compensate its thermal deformation surface shape, in particular to a self-correction method for thermal deformation of a deformable mirror under high-power continuous laser irradiation, and belongs to the field of strong laser technology and adaptive optics technology. Background technique [0002] With the rapid development of laser technology and the continuous expansion of its application range, how to obtain higher power and high beam quality laser has become a focus of attention and a goal of struggle. However, in a high-power laser system, under continuous laser irradiation, the optical element will form a temperature gradient distribution inside. At the same time, due to the thermal expansion of the optical element material, thermal deformation will occur, and wavefront distortion will be introduced to the incident beam. Although the adaptive optics technology can monit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B26/06
Inventor 张彬胡小川钟哲强
Owner SICHUAN UNIV
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