Typical devices that control light are lenses, mirrors, shutters, etc., which change or block the direction of light. The liquid crystal display can display images by controlling the light intensity. Focusing on the feature of light called “phase distribution” or “wavefront”, we have researched spatial light modulators for many years and developed LCOS-SLM as an optical wavefront control device. When the light propagates, the place where the phases are aligned at a certain time is said to be in the same phase θ, and the surface formed by connecting these consecutive points is called the wavefront.
LCOS-SLM is a device that controls the wavefront of light and can be easily controlled by a personal computer. By changing the refractive index of the liquid crystal in the plane, the wavefront shape of light can be freely controlled, and optical devices and functions such as lenses and diffraction gratings can be realized.
When the phase hologram derived by calculation is displayed on to the LCOS-SLM and irradiated with laser light, arbitrary beam pattern can be reproduced. By changing the optical arrangement of this phase hologram, light can be controlled in the same way as lenses, mirrors and shutters. Taking advantages of the fact that this device can control the phase in two dimensions dynamically (30 frames per second) with high precision, we have applied LCOS-SLM to laser processing, adaptive optics (fundus measurement), microscopes and optical tweezers. As a basic research, we also generate holograms of light beams with orbital angular momentum called Laguerre Gaussian beams. We conduct research and development of new devices and aim to improve technologies such as more advanced control and software.
As for a light detecting device, we have developed an intelligent vision sensor (IVS) and conducting applied research. IVS is an imaging system with a small high-speed image processing function that performs image acquisition, image processing and signal output in 1 millisecond. The feature of this camera is that it can acquire images at a frame rate in the order of kHz and perform image processing such as bright spot centroid calculation in real time. This device can be used for robot vision systems, we used IVS measurement results to control LCOS-SLM. Observation of the fundus is achieved by incident laser from the pupil, performing a raster scan, and measurement and reconstruction from the intensity of the return light. However, the scattered return light will be distorted due to the cornea, the crystalline lens and the vitreous. To correct this distortion, it is necessary to perform wavefront measurement. By using IVS, high-speed wavefront measurement has been realized under conditions that are susceptible to disturbances such as the microscope viewing angle.
It is important to make in-house optical materials such as crystals and optical thin films that would become key parts in optical devices, and we aimed to create such optical materials. At present, we are developing new devices from the creation of materials and to provide the materials technology we have cultivated to other prototype research. Particularly in the development of optical thin films, we are developing prototypes of mirrors, filters, and AR coatings for LCOS-SLM application research, contributing to device fabrication that cannot be achieved by SLM competitors.
It looks like you're in the . If this is not your location, please select the correct region or country below.
You're headed to Hamamatsu Photonics website for GB (English). If you want to view an other country's site, the optimized information will be provided by selecting options below.
For modern websites to work according to visitor’s expectations, they need to collect certain basic information about visitors. To do this, a site will create small text files which are placed on visitor’s devices (computer or mobile) - these files are known as cookies when you access a website. Cookies are used in order to make websites function and work efficiently. Cookies are uniquely assigned to each visitor and can only be read by a web server in the domain that issued the cookie to the visitor. Cookies cannot be used to run programs or deliver viruses to a visitor’s device.
Cookies do various jobs which make the visitor’s experience of the internet much smoother and more interactive. For instance, cookies are used to remember the visitor’s preferences on sites they visit often, to remember language preference and to help navigate between pages more efficiently. Much, though not all, of the data collected is anonymous, though some of it is designed to detect browsing patterns and approximate geographical location to improve the visitor experience.
Certain type of cookies may require the data subject’s consent before storing them on the computer.
This website uses two types of cookies:
There are two ways to manage cookie preferences.
If you wish to restrict or block web browser cookies which are set on your device then you can do this through your browser settings; the Help function within your browser should tell you how. Alternatively, you may wish to visit www.aboutcookies.org, which contains comprehensive information on how to do this on a wide variety of desktop browsers.
Occasionally, we may use internet tags (also known as action tags, single-pixel GIFs, clear GIFs, invisible GIFs and 1-by-1 GIFs) at this site and may deploy these tags/cookies through a third-party advertising partner or a web analytical service partner which may be located and store the respective information (including your IP-address) in a foreign country. These tags/cookies are placed on both online advertisements that bring users to this site and on different pages of this site. We use this technology to measure the visitors' responses to our sites and the effectiveness of our advertising campaigns (including how many times a page is opened and which information is consulted) as well as to evaluate your use of this website. The third-party partner or the web analytical service partner may be able to collect data about visitors to our and other sites because of these internet tags/cookies, may compose reports regarding the website’s activity for us and may provide further services which are related to the use of the website and the internet. They may provide such information to other parties if there is a legal requirement that they do so, or if they hire the other parties to process information on their behalf.
If you would like more information about web tags and cookies associated with on-line advertising or to opt-out of third-party collection of this information, please visit the Network Advertising Initiative website http://www.networkadvertising.org.
We use third-party cookies (such as Google Analytics) to track visitors on our website, to get reports about how visitors use the website and to inform, optimize and serve ads based on someone's past visits to our website.
You may opt-out of Google Analytics cookies by the websites provided by Google:
We inform you that in such case you will not be able to wholly use all functions of our website.