摘要:
A two-way optical transmitter in which optical transmitters each having light projecting means and light receiving means on an optical axis intersecting the optical axis of the light projecting means are disposed in opposed relationship with each other with a predetermined distance interposed therebetween and which effects two-way optical transmission, wherein a polarizing beam splitter, having a cemented surface forming a certain angle with respect to the optical axes of the light projecting means and the light receiving means is installed near the point of intersection between the two optical axes, linearly polarized light from the light projecting means is reflected by the cemented surface of the polarizing beam splitter to thereby provide transmission light, and an optical axis leading from the polarizing beam splitter to the light projecting means or an optical axis leading from the polarizing beam splitter to the light receiving means is set at an angle of approximately 45.degree. with respect to the vertical direction when the apparatus is seen from on the optical axis of the transmitted light.
摘要:
An optical space communication method is for communication with a laser as a radiative source and with a light signal therefrom propagating in the atmosphere. In the method, the communication is performed under the following conditions. In case a transmission distance of optical space communication is between 100 m inclusive and 200 m, the laser is a laser with an oscillation wavelength L (nm) in a wavelength range of between 967 run inclusive and 1110 nm or in a wavelength range of between 1165 nm inclusive and 1315 nm, whereas in case the transmission distance is not less than 200 m, the laser is a laser with an oscillation wavelength L (run) in a wavelength range of between 986 nm inclusive and 1090 nm or in a wavelength range of between 1225 nm inclusive and 1295 nm. At any position in a transmission path between a transmitter exit and a receiver entrance, an irradiance is set to at most 6.47.multidot.10.sup.(L-700)/500 (W/m.sup.2) where the oscillation wavelength L (nm) of the laser is in a wavelength range of 950 nm to 1050 nm while to at most 32.3 (W/m.sup.2) where the oscillation wavelength L is in a wavelength range of 1050 nm to 1400 nm.
摘要翻译:光学空间通信方法用于与激光作为辐射源通信,并且其光信号在大气中传播。 在该方法中,在以下条件下进行通信。 在光学空间通信的传输距离在100微米到200微米之间的情况下,激光器是在波长范围为967nm至1110nm之间或在波长范围内的振荡波长L(nm)的激光器 1165nm和1315nm,而在传输距离不小于200μm的情况下,激光是在986nm至1090nm之间或在波长范围内具有振荡波长L(游程)的激光器 在1225nm和1295nm之间。 在发射器出口和接收器入口之间的传输路径中的任何位置,辐射度被设定为激光器的振荡波长L(nm)为至多6.47×10(L-700)/ 500(W / m 2) 波长范围为950nm至1050nm,而至多32.3(W / m 2),其中振荡波长L在1050nm至1400nm的波长范围内。
摘要:
This specification discloses a communication apparatus provided with light emitting means for generating transmission light modulated by an information signal, light receiving means for receiving modulated reception light, an optical member for reflecting one of the transmission light and the reception light and transmitting the other therethrough, a reflecting member for reflecting the transmission light emerging from the optical member to the transmission side and reflecting the reception light to the optical member, light splitting means for splitting part of the reception light obtained through the optical member, detecting means for detecting the positional state of the light obtained from the light splitting means, and driving means for rotatively driving the reflecting member about two axes in accordance with the positional state of the light detected by the detecting means. The specification further discloses an apparatus which has a lens unit having positive refractive power disposed between the light emitting means and the light splitting means and in which at least one lens constituting the lens unit is moved to thereby vary the state of the light beam.
摘要:
An optical communication apparatus that includes a polarization beam splitter which synthesizes an optical axis of a light emitting optical system having a light emission element for emitting a linearly polarized light and an optical axis of a light receiving optical axis to make the optical axis for reception coincide with the optical axis for transmission. A phase plate is provided in such a manner as to be rotatable by a predetermined angle about the common axis. An optical axis of the phase plate of each of the associated communication apparatuses is set at an adequate angle before installation thereof.
摘要:
An illumination optical system for illuminating an object surface using light from a light source, the illumination optical system includes, a first optical system that includes a movable unit that is movable along an optical axis, said first optical system guiding the light to the object surface and varying an irradiation area on a certain plane, and a second optical system that can be located on and removed from an optical path of said first optical system, the second optical system varies, when located on the optical path of said first optical system, the irradiation area on the certain plane in cooperation with said first optical system, while maintaining a shape of a light intensity distribution on the certain plane, relative to the irradiation area irradiated only by said first optical system.
摘要:
Disclosed is an illumination optical system having an imaging optical system for imaging a predetermined object plane upon an image plane, by use of light supplied from an integrator that functions to produce a plurality of light sources using light from a light source. In one preferred form of the invention, the imaging optical system includes, in an order from a light incidence side thereof, a first lens group having a positive power, a second lens group having a negative power, and a third lens group having a positive power, wherein the second lens group includes a concave lens at a light exit side thereof and wherein the third lens group includes a convex lens at a light entrance side thereof. The position of intersection between an optical axis of the imaging optical system and a principal ray of abaxial light is defined between the second lens group and the third lens group.
摘要:
An illumination optical system for illuminating an object surface using light from a light source, the illumination optical system includes, a first optical system that includes a movable unit that is movable along an optical axis, said first optical system guiding the light to the object surface and varying an irradiation area on a certain plane, and a second optical system that can be located on and removed from an optical path of said first optical system, the second optical system varies, when located on the optical path of said first optical system, the irradiation area on the certain plane in cooperation with said first optical system, while maintaining a shape of a light intensity distribution on the certain plane, relative to the irradiation area irradiated only by said first optical system.
摘要:
An illumination optical system for illuminating an object surface using light from a light source, the illumination optical system includes, a first optical system that includes a movable unit that is movable along an optical axis, said first optical system guiding the light to the object surface and varying an irradiation area on a certain plane, and a second optical system that can be located on and removed from an optical path of said first optical system, the second optical system varies, when located on the optical path of said first optical system, the irradiation area on the certain plane in cooperation with said first optical system, while maintaining a shape of a light intensity distribution on the certain plane, relative to the irradiation area irradiated only by said first optical system.
摘要:
Disclosed is an illumination optical system having an imaging optical system for imaging a predetermined object plane upon an image plane, by use of light supplied from an integrator that functions to produce a plurality of light sources using light from a light source. In one preferred form of the invention, the imaging optical system includes, in an order from a light incidence side thereof, a first lens group having a positive power, a second lens group having a negative power, and a third lens group having a positive power, wherein the second lens group includes a concave lens at a light exit side thereof and wherein the third lens group includes a convex lens at a light entrance side thereof. The position of intersection between an optical axis of the imaging optical system and a principal ray of abaxial light is defined between the second lens group and the third lens group.
摘要:
An optical space communication apparatus includes a light-emitting device for emitting an elliptic light beam, and a light-projecting optical system for converting the elliptic light beam into a transmission light beam. The light-projecting optical system shapes a cross section of the transmission light beam into an elliptic shape immediately after having left the light-projecting optical system and also shapes the cross section of the transmission light beam into a nearly circular shape at a receiving point being located at the farthest distance in a transmissible distance range.