RESUMO
A 13 J direct-liquid-cooled solid-state disk laser with an unstable cavity is developed and demonstrated in this paper. The output energy of the resonant cavity is first analyzed according to the gain level in a stable cavity. At the optimum gain level, a magnification of 1.3 in the unstable cavity is achieved. Experimentally, a concave-convex mirror is used as the cavity mirror. At a magnification of 1.3, a repetition frequency of 100 Hz, and a pulse width of 350 µs, a single-pulse energy output of 13.2 J is obtained, corresponding to an optical-optical efficiency of 22% and a slope efficiency of 27.6%. The x-axis beam quality factor ß is 4.7, and the y-axis beam quality factorß is 16.6.
RESUMO
Continuous chest compressions during the transportation of patients with cardiac arrest have always been a difficult part in the field of pre-hospital emergency cardiopulmonary resuscitation (CPR). How to ensure continuous high-quality chest compressions is an important part of the patient's entire rescue process. At present, mechanical compression devices are commonly used to provide continuous high-quality chest compressions during the transportation. However, the installation process of the mechanical compression device involves posture changes of the patient, the placement of the device base, etc., and it is very likely to affect the continuous high-quality CPR treatment in the pre-hospital emergency process with limited human resources. Therefore, the First Affiliated Hospital of Huzhou University and Huzhou University jointly designed a rescue stretcher dedicated for CPR mechanical compression device, and has obtained the national utility model patent (ZL 2019 2 1005444.9). The main design feature of this stretcher is that the base of the compression device is combined with the stretcher, which eliminates the installation and fixation process of the base during the installation of the mechanical compression device, shortens the installation time. It has certain clinical applications value.