Proceedings Article | 29 August 2009
Zhi-chao Wu, Guang-yong Jin, Xue-chun Tan, Ming Ling, Zhu Liang
KEYWORDS: Er:YAG lasers, Mirrors, Blood, Semiconductor lasers, Laser applications, Laser development, Laser stabilization, Tissues, Tissue optics, Laser optics
Laser blood-sampling device is one of the foremost tasks in medicine domain. It has a lot of merits such as un-touching,
avoiding infection, indolence, and fast healing etc. The Er:YAG laser with wavelength of 2.94μm which is just close to
the absorbency peak of water can be strongly absorbed by water molecular, so it has very wide application value in
clinical medicine. In the paper, based on the mutual action characters of the laser with 2.94μm wave length on biological
tissues, such as high absorption, acting on surface, the design of a new type of laser blood-sampling device is introduced.
According to the needs of practice, the main component of the blood-sampling device is the laser, which includes optical
resonator, optical collector, pumping source, optical guidance and focusing system. All of them are designed in the
paper, and the reflection index of output coupling mirror of laser is optimized, the laser threshold is reduced, and
pumping efficiency is improved. Moreover, thermal effect of Er:YAG solid-state laser is analyzed and a reasonable
cooling method is designed. As a result, an excellent laser blood- sampling is obtained, the maximum output power is
about 1J, the optical to optical conversion efficiency is 1.2%. For the better production-grade, the cuprum-based
conduction is adopt to eliminate heat, the precision modulation and fixing of the optical resonance is achieved by the
special adjusting structure that not only improve the stability and reliability, but also reduce the size of laser bloodsampling
device. The size is 110×190×320mm, the weight is about 5.8kg, and the laser blood- sampling efficiency is
100%.