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                         Semiconductor Laser अर्धचालक लेसर Fig 1 The main component of a LASER are Active medium Pumping source Resonant cavity लेसर के मुख्य घटक है सक्रिय माध्यम पम्पिंग स्रोत गुंजयमान गुहा In semiconductor laser we can clearly understand that semiconducting material is active medium, Doping works as a pumping source and depletion layer works as resonant cavity.  अर्ध चालक लेसर में हम स्पष्ट रूप से समझ सकते हैं कि अर्ध चालक पदार्थ सक्रिय माध्यम है, डोपिंग, पम्पिंग स्रोत का कार्य करता है, और अवक्षय परत, गुंजयमान गुहा का कार्य करता है. LASER is light amplification by stimulated emission of radiation. So, to get laser light we get population inversion by pumping process and stimulate emission by photons, the place where the photon moves to stimulate the emission is known as resonant cavity.  लेसर है light amplification by stimulated emission of radiation. अत: लेसर प्रकाश प्राप्त करने के लिए हम पम्पि...

Properties and applications of laser beam लेसर किरणों के गुण और अनुप्रयोग Properties of laser beam The laser beam has certain characteristic properties, which are not present in beams derived from other light sources. These properties are- 1- Laser beam is completely spatially coherent. All the waves will be exactly in phase with one another. An interference pattern can be obtained not only by getting two sources by a single laser source but also by using two separate laser beams from two separate sources.  2- Laser light is almost perfectly monochromatic.  3- Laser rays are almost perfectly parallel. Hence it is extremely narrow and can travel a very long distance without spreading. Therefore, It can be focused at an extremely sharp point.  4- The laser beam is extremely intense. Because of its high energy density and directional property, a laser beam can produce temperature of the order of ( 10 4 ) o C at a focussed point. So it can evaporate even the hardest metal als...