Adjustment method of double path holmium laser

Abstract

The invention discloses an adjustment method of a double path holmium laser. The adjustment method of the double path holmium laser solves the problems that only a collimated light beam is used to adjust a first resonant cavity, and then two isosceles rectangular prisms are used to deflect the collimated light beam by 90 degrees, and therefore the collimated light beam is horizontally moved relatively to an original transmission direction. According to the adjustment method of the double path holmium laser, two 45 degree total reflective mirrors are used to sequentially replace the two isosceles rectangular prisms, and therefore the effect that the two total reflective mirrors are efficiently and accurately positioned is guaranteed. The collimated light beam after being reflected by the two total reflective mirrors is parallel to the original transmission direction, and then the optical axis of a second resonant cavity, adjusted by using the collimated light beam, is naturally parallel to the optical axis of the first resonant cavity, and furthermore laser light generated by the second resonant cavity sequentially passes through light paths formed after the two total reflective mirrors are deflected, and then overlaps with an extension line of the optical axis of the first resonant cavity, and therefore the adjustment method of the double path holmium laser guarantees that two paths of the laser light can be coupled into the same transmission optical fiber at the minimum loss when the two paths of the laser light work. The adjustment method of the double path holmium laser can achieve the purpose of efficiently and reliably adjusting a double path laser system, reduces demands for operation personnel, improves production efficiency, and reduces production cost.

Description

technical field [0001] The invention relates to the technical field of dual-channel holmium lasers, in particular to a method for adjusting a dual-channel holmium laser. Background technique [0002] Holmium laser is a pulsed laser made of Cr, Tm, Ho: YAG crystal, its output wavelength is 2.1μm in the absorption peak of water, therefore, this laser has a shallow penetration depth to human tissue and has high surgical accuracy. And it is safe for human eyes, and it can be transmitted by optical fiber, so it is a good light source for surgery in medicine. Therefore, holmium laser has been widely used in the fields of urology, dermatology, obstetrics and gynecology, gastroenterology, general surgery and ENT. [0003] The holmium laser has a high luminous threshold, and the thermal conductivity of the holmium laser crystal is low, so the electro-optical conversion efficiency of the holmium laser is low and the output power is low. In order to obtain a holmium laser treatment m...

AI Technical Summary

Problems solved by technology

As a result of this adjustment, the parallelism of the optical axes of the two resonators is not guaranteed; when installing two 45° flat mirrors, let the second collimated beam be reflected by the two mirrors and then incident on the first The center of the exit aperture of a collimated beam; when installing these two total reflection mirrors, the initial positions of the two total reflection mirrors are determined by their brackets and turntables, and the accuracy of their positions is determined by the mechanical design and processing level, but in any case It is impossible to reach the level required by the optics, and the pitch of the 45° flat mirror needs to be fine-tuned, but usually, the second collimated beam cannot enter the center of the first aperture after being reflected by them, and two adjustments are required The pitch of the total reflection mirror; for a total reflection mirror on the extension line of the optical axis of the second resonator, the adjustment effect of its pitch must be reflected by the total reflection mirror on the extension line of the optical axis of the first resonator, and the second collimation The relative position of the light spot of the beam on the diaphragm of the first collimated beam is reflected, which is related to the pitch of the two total reflection mirrors. It cannot be determined whether the adjusted total reflection mirror is consistent with the second resonant cavity according to the position of the light spot. The optical axis forms an included angle of 45°; when adjusting the total reflection mirror in front of the first resonant cavity, it can only be observed by human eyes whether the reflection point on the total reflection mirror is on the optical axis of the first resonant cavity, so when adjusting During this total reflection mirror, by observing whether the light spot of the second collimated light beam has arrived at the center of the diaphragm of the first collimated light beam, when determining the pitch of this total reflection mirror, it is impossible to determine the distance between this light beam and the first collimated light beam Whether the optical paths are completely coincident; there is an angle between the two optical paths, which will directly lead to the loss of coupling output

During the adjustment process, it is impossible to judge whether the normal of the total reflection mirror on the turntable is exactly at an angle of 45° with the direction of the first optical axis, and it is also impossible to judge whether the normal directions of the two total reflection mirrors are parallel

At present, there are no auxiliary measures for the adjustment of these two full-reflective mirrors, mainly relying on operating experience to repeatedly adjust the two 45° full-reflective mirrors

In addition, the adjustment of the two resonators is relatively independent, and it is difficult to ensure that the optical axes of the two resonators are parallel to each other, which adds difficulty to the adjustment of the 45° total mirror

Due to the misalignment of the 45° full reflection mirror, the output power of the laser system will be lost. Moreover, in actual production, even if this work is performed by skilled workers, the time consumption still has certain uncertainties.

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