A High Peak Power Holmium Laser System

Abstract

The invention discloses a holmium laser system with high peak power. The system comprises a total reflector, a laser gain medium, a pumped source, a polarizer, an electric light Q-modulated crystal and an output lens; and the electric light Q-modulated crystal is a La3Ga5SiO14 crystal with a special doping proportion of MgO, and the initial ratio of raw materials of the crystal is MgO=3.3-3.9 mol%, La2O3=31.8-32.1 mol%, Ga2O3=53.7-53.9 mol%, and SiO2=10.6-10.7 mol%. Thus, the problem that the electric light Q-modulated crystal is low in the damage threshold in the mid ir waveband at present, and nanosecond level laser output with high peak power is realized.

Description

technical field [0001] The invention relates to a holmium laser system, in particular to a high peak power holmium laser system, which adopts a special high damage threshold electro-optic Q-switching crystal. Background technique [0002] Urinary calculus is a common disease and frequently-occurring disease in urology. Calculi can be found in any part of the kidney, bladder, ureter and urethra. Urinary calculi are easily complicated by obstruction and infection, often accompanied by severe pain symptoms, which bring great pain to patients. . [0003] Holmium laser lithotripsy was first applied in intracavitary lithotripsy in 1995. Compared with other intracavitary lithotripsy, it has obvious advantages. Stones do not move during lithotripsy, and the debris generated is small, and the date of stone clearance is also significantly shortened, which reduces the length of hospital stay; holmium laser lithotripsy does not interfere with the endoscopic field of view, and the shock...

AI Technical Summary

Problems solved by technology

[0005] However, for Q-switched holmium laser technology with high peak power and narrow pulse width, there are currently some technical obstacles

For example, there is a mature electro-optic Q-switched crystal KD*P with superior performance in the near-infrared band (1064nm), but there is a lack of crystals with high optical damage threshold and good electro-optical performance in the mid-infrared band; moreover, holmium laser belongs to quasi-three Energy level structure, under high peak power electro-optic Q-switching operation, its thermal lens effect and thermal depolarization effect will be very obvious, which will not only significantly reduce the laser efficiency and greatly reduce the peak power, but also make the beam mode worse, which is not conducive to its related application

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