A NOVEL TWIN SIDE LASER RESONATOR Background Art: The industrial laser resonators are commonly consisting with an active medium, a pumping mechanism and resonator cavity. Resonator composed of end-mirrors between which the atoms and molecules of the active medium lies and excited, i. e. pumped by the pumping mechanism, and between which stimulated emission of ,... radiation from the active medium is initiated, and amplified by back and forth reflections traveling through the active medium. In most stable resonators, one mirror, called the output coupler mirror, is partially transmissive and second mirror is totally reflective. The transmitted part of the stimulated emission of radiation constitutes the usable output laser beam. In most of the resonators, part of the stimulated emission of radiation is not reflected back in the resonator cavity, pardy because of diffraction losses, and constitutes the usable output laser beam. Laser material processing such as cutting, welding, drilling etc. are required in various industrial sectors like automobile, tooling, surgical & orthopedics, electronics & communication, Bio-medical, Non-conventional engineering for which a laser beam is required. Laser resonators being used in above industrial sectors provides one sided laser material processing and hence the process becomes costly, time & electricity consuming. In addition such laser resonators occupy more space, needed more consumables which in turn reduces the productivity.

Technical Field : To overcome such limitations experienced by above laser resonator, a novel twin side laser resonator is invented. It has a unique design such that at both end of

the resonator, laser beam is obtained which in turn used for laser material processing in the industrial sectors mentioned above.

Brief description of drawings : The present invention will be described with greater specific and clarity with reference to following drawings: Fig. l represents front view of the twin side processing laser resonator.

Fig. 2 represents top view of the twin side Processing laser resonator.

Disclosure of Invention: Figure 1 is a front view showing configuration of a laser resonator. In the Fig. and 2 designated at the reference numeral 1 is a laser head, 2 & 3 are out put mirrors located on both side of, the laser head 1. In laser head 1, Rod is made of Nd: YAG/ Nd : Glass and it works asta pumping source to produce more photons. Nd atoms arc doped into YAG material or glass and this doping proportion consist of 0.5%-0. 9% and it may vary according to process requirement. These photons fall on flash/arc lamp, which ultimately produces laser light. Two output mirrors 2 & 3, having reflection ratio between 60%-92% are placed at both end of laser resonator to amplify the laser light. Q-Switch produces a powerful pulse from the'continuous beam. Since both out put mirrors having reflectivity of 60%-92% and hence from both end of the out put mirrors, laser beam can be attained which in turn used to provide particular application. Reference number 4 & 5 are apertures provided between the out put mirrors 2 & 3 to set a specified hole diameter. Also apertures 4 & 5 are restrict the light amplification along the off-axis of laser resonator and thus provides sharp frequency band. Reference number 6 is poloriser, 7 Q-switch and 8-shutter mount are placed in a laser resonator. Stimulated emission of radiation from the laser head is

initiated between two output mirrors 2 & 3, and amplified by back and forth reflection. Reference number 7 is Q-switch serves as a fast acting switch for pulsing the laser on and off. Reference number 9 & 10 are beam expanders placed to expand the laser beam, 11 & 12 are motorized shutters which are provided at out side the resonance area motorized shutters, which are located at 11 & 12 blocks & transmit the laser beam automatically. As the output mirrors 2 & 3 are placed on both side of the laser head 1, light is repeatedly reflected between the output mirrors 2 & 3, and the light passes through the laser head whereby induced emission is generated. The laser beam is amplified and radiated by means of this induced emission and the beam going around between the output mirrors 2 & 3. The out put mirrors 2 & 3 has the characteristics that it reflects a portion of the laser beam and transmits the remaining portion there through. So that the transmitted beam is taken out to outside as a laser beam, and the reflected beam is used for further amplification. The apertures 4 & 5 means has a function for deciding a form of a beam mode generated between the output mirrors 2 & 3. In a stable system, the beam reflected from the mirrors in turn is periodically focused, while in an unstable system the beam broadens more and more with each reflection.

A twin side processing laser resonator at both end of the same, laser beam is obtained which in turn used for laser material processing in the various industrial sectors such as automobile, tooling, surgical & orthopedics, electronics & communication, Bio-medical, Non-conventional engineering.