Mode-controlled laser pen for controlling fine particles

Abstract

The invention discloses a mode-controlled laser pen for controlling fine particles, and relates to a laser device. The mode-controlled laser pen comprises a pumping source, a micro-lens, a first lens, a second lens, a laser work substance layer, an output coupling lens and a frequency-doubling crystal, wherein the pumping source, the micro-lens, the first lens, the second lens, the laser work substance layer, the output coupling lens and the frequency-doubling crystal are sequentially arranged on the same optical axis from front to back; and a high-brightness single-tube diode with a corresponding wavelength can be adopted by the pumping source. An operation method with a plurality of controllable realization modes is adopted; a flexible structure is adopted; the mode-controlled laser pen can be dismantled and assembled at any time; an operation means for a control mode is abundant and various; the overall structure can be set into a five-section mode, and can be spliced by an internal thread structure; laser output with a controllable IG mode is directly generated; the pumping source is high in brightness and small in size, so that a product is miniaturized, integrated and practical; a laser working apparatus can be assorted according to the requirements; and the mode-controlled laser pen is good in laser directivity, high in brightness, small in pulse width and high in peak power.

Description

technical field [0001] The invention relates to lasers, in particular to a mode-controllable laser pointer for manipulating microparticles. Background technique [0002] Laser technology is one of the four major inventions of the 20th century that are as famous as atomic energy, semiconductors and computers. Laser has the advantages of good monochromaticity, good coherence, good directionality, and high brightness. It is mainly used in six major fields such as industry, medical treatment, commerce, scientific research, information, and military affairs. [0003] With the development of lasers and more in-depth research on laser applications, researchers have observed a variety of transverse mode mottling in experiments, and theoretically solve the paraxial wave equation Under the three coordinates, three corresponding complete solution systems are obtained. In the Cartesian coordinate system, the Hermilt-Gauss (HG) beam is obtained; in the circular coordinate system, the ...

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Problems solved by technology

In 2004, researchers at the University of Regensburg in Germany ([1]U.T.Schwarz, et al.Observation of Ince–Gaussian modes in stable resonators.Opt.Lett.29(16):1870-1872(2004)) broke the The symmetry of the resonant cavity directly generates high-quality high-order IG modes in a laser diode-pumped Nd:YVO4 solid-state laser for the first time. This study obtained a laser output of 20mW when the absorbed optical power was 300mW, and the light-to-light conversion efficiency Less than 7%, less efficient

In 2011, M.Woerdeman et al. ([2]Mike Woerdemann, et al.Optical assembly of microparticles into highly ordered structures using Ince–Gaussian beams.Appl.Phys.Lett.98,111101(2011)) used laser beams through holographic The spatial light modulator (SLM) prepared by the technology produces different modes of IG beams. Although this research can achieve different IG mode laser beam outputs, it is not only inefficient, complex in structure, but also expensive.

In 2013, researchers from Kwazulu-Natal University in South Africa ([3]Sandile Ngcobo, et al.A digital laser for on-demand laser modes.Nat.Commun.4:2289(2013)) used digital holography to prepare phase-pure The reflective spatial light modulator forms an erasable holographic back cavity mirror to replace the back cavity mirror in the traditional laser to realize the mode controllable digital laser. Laser output, the optical conversion efficiency is less than one thousandth

In addition, the damage threshold of the spatial light modulator (SLM) is low, which is not suitable for high-power laser operation. In addition, the resolution of the spatial light modulator (SLM) is not high, and it cannot fully meet the output of various laser modes.

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