They include shiretoko , the hidden scenic spot full of wild animals , which is ready to be inscribed as a world natural heritage ; lake akan nurturing marimo ( algae ball ) , a natural monument ; kawayu and teshikaga hot spring resorts surrounded by important tourist spots ; and the land of tokachi where you can see the horizon 野生生物出会世界遗?登?待秘境知床、天然记念物育阿寒湖、屈指?光地?川汤弟子屈温泉。地平线感十胜大地最北海道残。
By use of g . d . shen ' s tunneling cascade theory we have fabricated high performance and high power tunneling cascade ingaas / gaas / algaas 950nm / 990nm double wavelength strained quantum well lasers on the basis of former tunneling cascade high power lasers and high brightness light emitting diodes . the lasers " two peak wavelength are 95 ? nm and 990 ? nm . el spectrum ' s fwhm is 3nm 在以往隧道级联大功率应变量子阱激光器及高亮度发光管的理论研究与实验的基础之上，采用沈光地教授提出的隧道级联思想，成功研制出基于ingaas gaas algaas材料的高性能大功率隧道级联950nm及990nm双波长应变量子阱激光器，激射波长分别为952 2nm和990 2nm ， el谱的谱线宽度约3nm ，未镀膜器件单面最大输出光功率可达2w以上，阈值电流最低达120ma 。
In order to overcome the three main limitations of the conventional gaas / algaas qwips , small photocurrent , high dark current and hence high noise , and low response speed , the novel mechanism of qwips that photocurrent increases step by step with the well number ' s increasing was proposed by professor shen 针对常规gaas algaas量子阱红外探测器存在的光电流小、暗电流大、响应速度低等问题，沈光地教授提出了新型光电流逐级增强gaas algaas量子阱红外探测机制。
