摘要:
A total internal reflection, face pumped laser is provided, in a single head, with two (or more) generally parallel, spaced apart hosts for providing a higher average power output than the typical single host FPL. A pair of flash lamps, one each adjacent the outer surface of each host, acts as the "pumping" means for the laser and operates in effect to produce asymmetrical pumping of the respective hosts. In order to prevent exceeding the thermal stress limit and thermally inducing bending of the hosts, a system of asymmetrical cooling is provided whereby a greater flow of fluid coolant is provided the surfaces of the two hosts which are closer to the "pumping" flash lamps than to the inner host surfaces which are proximate one another.
摘要:
Devices for transmission of radiant energy from a convex source to a convex receiver wherein a concave wall reflects rays of selected angularity of source onto the receiver at a selected angularity and in a single reflection. Preferred devices permit transmission of extreme energy rays from a tubular source to a tubular receiver with one or less reflection.
摘要:
Multiple input laser pulses, wherein each pulse serves to create the population inversion for the next pulse, are amplified in the laser medium of a single laser amplifier apparatus.
摘要:
An electrical signal, such as a high current pulse, is applied to a series of two or more conducting strips (101-110) installed in series in a laser cavity (150, 151) containing either a buffer gas or a vacuum. The strips are separated by small gaps. When the electrical signal is applied to the strips, plasmas (141-149) are formed in the gap regions. The plasmas are comprised of ions from the strip material. Once formed, these plasmas expand hemispherically, cool and recombine to generate radiation. The composition of the plasmas depends on the strip material, the electric field in the gaps, the gap size and the background gas type and pressure.
摘要:
A high-power laser head has a neodymium-doped glass rod as its active material and a source of light for exciting the glass rod to make it amplify laser radiation at 1.06 microns wavelength. The light source tends to illuminate the outer portions of the rod better than its axial zone thereby exciting the rod un-evenly. However, the outwardly directed light from the light source is collected by a spherical reflector and refocussed on a ruby laser which is aimed along the axial zone of the glass rod to increase its excitation in that zone and provide a more evenly excited glass rod. A mirror is placed between the glass rod and the ruby laser on the axis of the rod. The mirror reflects laser light at 1.06 microns wavelength but allows it to pass at the ruby wave length.
摘要:
In a method and apparatus for producing and controlling a beam of radiation such as a laser beam issuing from a gaseous working medium in a working region wherein the gas is subjected to an electric field and an ionizing beam is directed to the gas, ionizing the gas and producing therein secondary electrons sufficient to support laser action, the power of the laser radiation is controlled by controlling the power of the electron beam and the electron beam power is controlled by an electrical feedback signal from a radiation detector that detects a fraction of the laser radiation.
摘要:
The reflective mirror system of a laser is shaped and arranged relative to the pump source and active material so that the light from the pump source passing by or through the active material is reflected back into the pump source. This is intended to increase the proportion of light absorbed by the active material.
摘要:
A laser cavity containing a mixture of nitrogen, N.sub.2, and mercury, Hg, gas is optically pumped by a lamp containing mercury to produce a laser output of 546.1 nm. The upper laser level is excited through optical pumping by a resonance lamp while the lower level which is a low lying metastable state is depopulated by collisional quenching.
摘要:
An improved laser particularly well adapted to produce high flux densities is disclosed. The disclosed laser includes an optical cavity wherein a curved window and a convex mirror make up one end wall assembly, such window and mirror being disposed with respect to each other in such a manner that the flux density at the window is less than the flux density at the mirror and, at the same time, energy reflected from the window constructively interferes with energy within the optical cavity.
摘要:
Utilizing round optical fibers as communication channels in optical communication networks presents the problem of obtaining a high efficiency coupling between the optical fiber and the laser. A laser is made an integral part of the optical fiber channel by either diffusing active material into the optical fiber or surrounding the optical fiber with the active material. Oscillation within the active medium to produce lasing action is established by grating the optical fiber so that distributed feedback occurs.