Narrow pulse holmium laser

Abstract

The invention discloses a narrow pulse holmium laser. A pumping assembly composed of chromium-thulium-holmium-yttrium-aluminum-doped garnet crystals with the rod length thereof to be 15 mm and the roddiameter thereof to be 5 mm, a ceramic diffuse reflection light condensation cavity and an excitation source is arranged between the resonant cavity reflecting mirror of the laser. The resonant cavity reflecting mirror is composed of a first total reflective mirror (M1), a second total reflective mirror (M2), a third total reflective mirror (M3), a 45-degree total reflective mirror (M4), and a 45-degree semi-reflecting mirror (M5), wherein the surfaces of the first total reflective mirror (M1), the second total reflective mirror (M2), the third total reflective mirror (M3) and the 45-degree total reflective mirror (M4) are plated with a 2100nm total reflecting film; one side of the 45-degree semi-reflecting mirror (M5) is plated with a 2100nm antireflection film, and the other side of the45-degree semi-reflecting mirror (M5) is plated with a 2100nm 50% permeable film. The two ends of a first pumping assembly (1) in the pumping assembly are provided with the first total reflective mirror (M1), the 45-degree total reflective mirror (M4), the 45-degree semi-reflecting mirror (M5) and the third total reflective mirror (M3). The two ends of a second pumping assembly (2) are provided with the second total reflective mirror (M2), the 45-degree semi-reflecting mirror (M5), the third total reflective mirror (M3) and the 45-degree total reflective mirror (M4). The output of the laser is up to 4J, and the laser can be easily and widely commercially applied to the urinary system lithotripsy field.

Description

technical field [0001] The invention relates to a holmium laser, in particular to a narrow pulse holmium laser. Background technique [0002] As one of the main components of non-invasive or minimally invasive surgical devices, holmium lasers have been widely used in the operations of urology, ENT, dermatology, gynecology and other departments. [0003] Currently, the holmium laser pulse with a pulse width of 200 μs has the best lithotripsy effect, which has been widely used in the field of urinary system lithotripsy. Based on the working substance in the holmium laser—the chromium-doped thulium holmium yttrium aluminum garnet crystal has a damage threshold of 10J (joule) / cm when the pulse width is 200μs 2 , the existing holmium laser output pulse width 200μs holmium laser pulse constitutes as figure 1 Shown: resonant cavity mirror—a pump component is placed between the total reflection mirror and the output mirror; the pump component is composed of a chromium-doped thuliu...

AI Technical Summary

Problems solved by technology

In order to solve this problem, multi-channel holmium lasers are used to cross in time by means of rotating mirrors to achieve high repetition rate and high power output, but the highest pulse energy is still 2J; there is also the use of two parallel holmium lasers The laser is coupled into the optical fiber through the lens. The ideal situation is equivalent to doubling the beam diameter to 10mm. Since the core diameter and numerical aperture of the optical fiber are limited, it is still very unfavorable for the coupling of light after the incident angle is doubled. defect

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