Dual-rectangular hollow laser based on spherical aberration regulation-control thermal-stability region and laser shaping and amplification

Abstract

The invention discloses a dual-rectangular hollow laser based on a spherical aberration regulation-control thermal-stability region and laser shaping and amplification, and belongs to the technical field of laser. The dual-rectangular hollow laser comprises a local oscillator stage and an amplification stage; a local oscillator pump, a focusing coupling lens group, a total-reflection-cavity mirror, a local oscillator gain dielectric rod, an auxiliary lens and a local oscillator output coupling lens are optically and coaxially arranged in sequence; the total-reflection-cavity mirror is a plano-concave lens, and the concave surface of plano-concave lens faces to the local oscillator gain dielectric rod; the local oscillator pump is 10-40W in output power; the auxiliary lens is a positive lens; the circular cone lens group in the amplification stage pumping light source comprises two positive circular cone lens which are arranged in opposite; a middle-transmission reflective mirror is positioned on the optical axis on one side of the output end of the circular cone lens group, and an angle of 45 degrees is formed between the middle-transmission reflective mirror and the optical axis; the amplification gain dielectric rod is positioned between one side of the middle-transmission reflective mirror and an external-transmission reflective mirror; and the external-transmission reflective mirror is perpendicular to the optical axis of the amplification gain dielectric rod. Dual-half Gaussian hollow resonant light is obtained based on the spherical aberration regulation-control thermal-stability region; and then the dual-half Gaussian hollow resonant light is shaped and amplified through inverse dual-half Gaussian hollow pump light to obtain the dual-rectangular hollow laser.

Description

technical field [0001] The invention relates to a spherical aberration control heat stable region and a double-rectangular hollow laser for stereotyped laser amplification. The spherical aberration control heat stable region is used to obtain double-half Gaussian hollow resonant light, and the reverse double-half Gaussian hollow pump light is used to shape the double-half laser. Gaussian hollow resonant light is obtained to obtain double rectangular hollow laser, which belongs to the field of laser technology. Background technique [0002] A hollow laser is a ring-shaped beam with zero central light intensity in the propagation direction, which is called "hollow beam" or "dark hollow beam". The barrel-shaped intensity distribution, small dark spot size and propagation invariance, spin, and orbital angular momentum of hollow beams enable hollow beams to be used as laser catheters, optical tweezers, and optical wrenches for precise manipulation and control of micrometers Micr...

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Problems solved by technology

[0004] However, whether it is a double half-Gaussian hollow beam or an anti-double half-Gaussian hollow beam, although the light intensity of the former inner wall and the latter outer wall changes step-wise, the light intensity of the former outer wall and the latter inner wall is the same. It is not a step change, and, from the inner wall of the beam to the outer wall, the light intensity decreases or increases according to the Gaussian function. This kind of hollow beam does not have an efficient Sisyphus cooling effect on neutral atoms. To obtain this effect, it is required that the beam’s The light intensity of the inner wall and the outer wall changes in steps, and the light intensity remains unchanged from the inner wall to the outer wall of the beam, such as Figure 4 As shown, this kind of hollow beam is called a double rectangular hollow beam. The double rectangular hollow beam has a very high intensity gradient, which is expected to reach or even exceed the intensity gradient of the evanescent wave light field. However, this is only a hollow beam in a class of designs. Now The technology has not yet obtained such a hollow beam

[0005] In addition, the prior art is to take technical measures outside the laser to obtain a hollow beam. As a whole, the structure of the device becomes complicated, the volume increases, and the cost increases.

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