Pumping can be done in two ways – electrical discharge method and optical method.
The breakthrough in the design of solid-state lasers came with optical pumping based on laser diodes (see Chapter 8). The helium-neon laser consists of three essential components: Pump source (high voltage power supply) Section 2.1: Diode Pumped Lasers Overview.
Though CQDs should be promising as laser materials, they are not yet practical since they need to be powered by another source of light energy—a method known as optical pumping…
The method is applied to the transition C 3 Π u (v = 0) → B 3 Π g (v = 0) in nitrogen (0.3371 μm). An experimental technique is described for investigating the electrical breakdown process which determines the pumping of an axial-field self-terminating gas laser. Two level pumping Scheme 2. Helium-Neon laser usually called a He-Ne laser is a type of gas laser in which a mixture of helium and neon gas is used as gain medium. Unanswered Questions.
Helium-neon laser construction.
The advantage of a semiconductor laser is that it is a small laser with an active medium in the solid phase, which directly converts electrical energy into laser radiation energy suitable for solid-state laser pumping. Different Pumping schemes in LASER – by Praveen Vaidya, SDM College of Engg. The electric discharge coverts the gas into a plasma where active centers collide inelastically with free electrons and population inversion is achieved.
... Gas lasers commonly use electrical pumping or laser pumping, because their absorption bands are narrower than solid and liquid lasers, wide band lamp light is not efficient enough, much of the lamp energy is dissipated as heat.
Depending on the type of laser, there are different ways to do this. When a racer gets thrown out of a race he gets this. Use is made of the following published data: (1) mean electron energy and (2) electron drift speed as functions of the ratio of electric field to pressure and (3) cross-sections for electron impact excitation to the laser …
This allows an inverse population of neon atoms to build up.
Optical pumping, in physics, the use of light energy to raise the atoms of a system from one energy level to another. Examples of pump sources are electrical discharges, flash lamps, arc lamps , light from another laser… Applying a sinusoidal electrical bias to colloidal quantum dots (CQDs) lowers their amplified spontaneous emission (ASE) threshold, potentially enabling electrical pumping of a CQD laser. ... each laser pulse occurring after a flash of the pumping light. The excited helium atoms then collide with neon atoms, transferring energy.
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... the optical pumping method is not used instead an electrical pumping method is used.
For example, in the helium-neon laser the electrons from the discharge collide with the helium atoms, exciting them.