之所以要记录下来，就是要让自己以后不要再犯重复的错误，看看自己搞坏了多少实验设备，烧了导师多少科研经费。只希望以后，在这里的内容能越少越好。 (1) 时间：2021-02-25 器件名：15mm, Uncoated, N-SF11 Micro Right Angle Prism， 价格：S$213.90/piece 损坏原因：我要把粘在基座上的prism给清洗下来，所以就把它俩一起放在了小烧杯里，再往里面加了丙酮(Acetone)。大概过了一天，胶水都溶解在了丙酮里，我要把棱镜取出来。（错误操作来了）于是我就用金属镊子去夹棱镜的上下底面，想把它取出来。一个没夹稳，prism就掉到了小烧杯的杯沿，然后再落到了光学平台上。经过这两次碰撞，我的心都碎了。果真，prism的corner破了，更惨的是，它的Hypotenuse surface也出了一个洞。惨兮兮的安慰自己，还好它破的洞是在下方，不是正中间，不然真的完全不能用了（虽然这种情况下，已经极大影响使用了）。 反省一下：其实那时候，我该怎么做才保险呢？我应该先把烧杯倾斜，慢慢把丙酮倒了；然后再把烧杯斜放在多层纸上，用镊子把烧杯里的prism给慢慢挪出来。
1.在Optical Coherence Tomography – Technology and Applications的第39页中，提到： The spectral resolution is governed by multiple factors including the optical aberrations in the spectrometer lenses, the resolution of the diffraction grating, camera pixel size, and electronic pixel cross talk. 关于光谱仪的分辨率，可以见How to build a spectrometer – theory，或者这里.
In this paper Microrobotic laser steering for minimally invasive surgery, a new mirror design is proposed for laser steering application. Integrated with present surgical tools, this device is 6 millimeters in diameter and 16 millimeters in length and is able to focus and steer a fiber-based laser beam at high speed (1.2 kilohertz bandwidth) over […]
(45) 2022-03-15: Simulation Analysis on the Profiles of Droplets Wetting on the Substrates Note: Use Surface Evolver to simulate the droplet behavior on the tilted substrate. Some parameters need to be set up, including water density, surface tension, radius of the substrate, and the contact angle. (44) 2022-02-04: Gravity-Controlled and Boundary-Constrained High-Throughput Fabrication of Polymeric […]
Basic tutorial (1) How does a galvanometer confocal scanning system work (2) The principle of a galvanometer A galvo system consists of three main components: the motor or galvanometer, the mirror or mirrors, and the "servo"—the driver board that controls the system. (3) Small Beam Diameter Scanning Galvo Mirror Systems on Thorlabs Each system includes […]
1.在Optical Coherence Tomography – Technology and Applications的第36页中，提到： The interference of the two beams will have a spectral modulation as a function of frequency which can be measured using a spectrometer. The periodicity of this modulation will be inversely related to the echo time delay. Therefore, different echo delays will produce different frequency modulations. The echo […]
1.什么是protected silver？什么是enhanced silver? 它们之间有什么不同？ 在可见、靠近红外和中红外区域的任何受保护金属涂层中，Protected silver具有最高的反射率，对波长、入射角和极化不敏感。 Enhanced silver主要用来优化某一波长的反射率，对波长、入射角和极化较敏感。
1.怎么调节光源的水平呢？ 这里提供了两种方法，一种是光源高度可调的情况下，使用调节架直接调节，还用到了尺子。第二种是光源固定的情况下，利用了两个反射镜和两个可变大小的孔阑。 2.啥是Fiber Optic Pigtail? 它和Fiber Patch Cord有啥区别？ Fiber Optic Pigtail可以叫光纤尾纤，Fiber Patch Cord可以叫做光纤跳线，具体的解释见这里。
1.怎样清理photdiode的表面呢？可参考这里： Although photodiodes in packages or in chip form are reasonably rugged, avoid touching the cell or package window with bare fingers. To clean a detector, any dust or loose particles should first be blown away using dry compressed gas. The detector surface or window can then be cleaned by using a lint free swab […]
1.在Optical Coherence Tomography – Technology and Applications的第27页中，提到： OCT imaging is performed with low numerical aperture focusing in order to have a large depth of field. 通常情况下，成像的焦深大于相干长度，这样就能保证在一定的深度下，系统能够实现相干成像。 2.在Optical Coherence Tomography – Technology and Applications的第29页中，提到： OCM images can be obtained at different depths by adjusting the focus depth while matching the reference arm path delay to the […]