Patent•
Device for realizing laser beam wavefront spherical aberration dynamic compensation and method thereof
07 May 2014-
TL;DR: In this paper, a device for realizing laser beam wavefront spherical aberration dynamic compensation and a method thereof is presented, which is beneficial to industrial processing and is multi-purpose.
Abstract: The invention discloses a device for realizing laser beam wavefront spherical aberration dynamic compensation and a method thereof A light is output from a short arm of a laser oscillator Through a 4f imaging system, a beam is imaged at a position with the maximum negative spherical aberration and passes through a crystal with positive spherical aberration By adjusting amplifier stage pumping current, the spherical aberration size of the crystal is adjusted to appropriately compensate the spherical aberration of the beam, thus the beam quality is improved According to the invention, without precisely measuring the spherical aberration size of the beam, the amplifier stage pumping current is changed to compensate the spherical aberration size, which is simple and easy; for the beams with different spherical aberrations, the compensation can be carried out without customizing an expensive spherical aberration compensation plate or deformable mirror; the spherical aberration is compensated, and at the same time the beam power is magnified; and the device and the method are beneficial to industrial processing and are multi-purpose
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Patent•
20 Apr 2016
TL;DR: In this paper, the authors proposed a high-energy Ti sapphire multipass amplifier thermal lens effect inhibition method, comprising: through calculation, determining the thermal lens focal length of Ti SApphire under concrete pumping conditions; creating a corresponding lens array according to the space layout of an amplifier; based on the hypothesis of amplifying output collimating plane waves, utilizing an ABCD matrix to reversely calculate the radius of signal light at the convex lens in a beam expanding system and the convergence angle of a light beam.
Abstract: Provided is a high-energy Ti sapphire multipass amplifier thermal lens effect inhibition method, comprising: through calculation, determining the thermal lens focal length of Ti sapphire under concrete pumping conditions; creating a corresponding lens array according to the space layout of an amplifier; based on the hypothesis of amplifying output collimating plane waves, utilizing an ABCD matrix to reversely calculate the radius of signal light at the convex lens in a beam expanding system and the convergence angle of a light beam; and designing a corresponding beam expanding system according to real incoming signal light, allowing the radius of signal light at the convex lens after beam expanding to be the same with a calculated value, and possess a divergence angle equal with the convergence angle, thereby compensating for the thermal lens focusing effect for the light beam. The method can completely compensate for the light beam focusing generated by thermal lenses under the condition of not introducing extra chemical elements, avoid laser material damage caused by thermal self-focusing, and effectively increase amplifier energy extraction efficiency. The method is simple and efficient and has strong practicality.
References
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Patent•
17 Nov 2005TL;DR: In this paper, an optical pick-up to perform recording or reproducing for an optical recording medium is disclosed, which includes a light source configured to emit a light beam, an objective lens configured to focus the light beam onto the optical record medium, and an aberration generation device provided between the light source and the objective lens.
Abstract: An optical pick-up to perform recording or reproducing for an optical recording medium is disclosed, which includes a light source configured to emit a light beam, an objective lens configured to focus the light beam onto the optical recording medium, and an aberration generation device provided between the light source and the objective lens, configured to generate coma aberration for the beam focused by the objective lens, based on a detected value from a device configured to detect a degree of tilt of the optical recording medium, wherein the tilt is compensated for by the coma aberration generated by the aberration generation device.
9 citations
Patent•
31 Jan 2007
TL;DR: In this paper, a semiconductor double-end-pumped Nd:YVO4 high-power single-mode solid laser, comprising two laser diodes, 45 deg mirror, two optical fibers and two optical coupling systems, was presented.
Abstract: The invention is a semiconductor double-end-pumped Nd:YVO4 high-power single-mode solid laser, comprising two laser diodes, 45 deg mirror, two optical fibers, two optical coupling systems, Nd:yvo4 crystal, Q-switch, mirror, output mirror and cooler, and theoretically making detailed synthetic optimization design for cavity structure, thermal lens focal length, and doping concentration, damage threshold and length of Nd:YVO4 crystal. And the experiment shows that the experimental results accord with the theoretical design, perfectly.
5 citations
Patent•
22 May 2013
TL;DR: In this paper, a one-way through laser amplifier for improving light beam quality is proposed, and the focal length and position of a coupling lens are adjusted for regulating light beam which diffuses again after the light beam entering into an amplifier stage is changed into convergence, and then the angle of divergence and the radius of the lightbeam entering into the amplifier stage are regulated.
Abstract: The invention discloses a one-way through laser amplifier for improving light beam quality, and so that the quality of light beam which passes through the laser amplifier in a one-way mode can be improved obviously. The invention further discloses a method for improving the light beam quality based on the laser amplifier. The focal length and the position of a coupling lens are adjusted for regulating light beam which diffuses again after the light beam entering into an amplifier stage is changed into convergence, and then the angle of divergence and the radius of the light beam entering into the amplifier stage are regulated. A laser amplification system which is designed according to the design method not only can obtain high power laser output but also can effectively control the light beam quality of amplifier stage output by adjusting the focal length and the distance of the coupling lens and amplifier stage working currents under the condition that high power lasing diode pumping is used.
3 citations