The pumping light source can be any of several different lasers, including a nitrogen laser (3371 Å), a frequency-doubled Nd:YAG laser (5320 Å), or an XeCl excimer laser (3080 Å). The M27 and M29 lasers are semicooled at 45°C, low-profile 10-PIN small-form-factor (mini-butterfly) packaged pump lasers. In this case, the laser module has a Samarium doped filter … electrical pumping to achieve laser action in color centers in the alkali halides. Laser diodes convert much of their electrical input into laser light, which is then efficiently absorbed by the Nd-doped crystal. Second, the key parameters of the gain module as the optical amplifier will be discussed. The example of four level pumping scheme is Helium-Neon laser and Carbon di-oxide laser or Gas lasers. In this paper, an all diode-pumped 4J 527 nm Nd:YLF laser for pumping Ti:Sapphire lasers will be systematically demonstrated. Pulsed lasers have very high intensities because the laser intensity is concentrated in a very short time duration. The optical pumping process in an insulating solid-state laser can be illustrated schematically with reference to Fig. Ideally, particles that reach this state should transfer rapidly into the upper laser level, level 2. 4 1 Lasers: Fundamentals, Types, and Operations N N E 0 E E 1 E 3 E 0 E E 1 2 Fast decay Fast decay Fast decay Pumping Pumping Lasing Lasing (a) (b) Figure 1.1 Energy level diagram for (a) three- and (b) four level laser systems. A polarization-independent pumping scheme for an end-pumped Yb:KGd(WO4)2 laser oscillator is proposed. The Nd-doped laser crystal has intense, sharp absorption peaks at 808 and 880 nm — wavelengths that are readily accessible to InGaAs semiconductor laser diodes (Figure 1). This pump chamber is for an application where the laser rod can not be disturbed during flashlamp replacement. •Active Medium; a mixture of 10 parts of He to 1 parts of Ne •Ne-atoms; active centres- have energy levels suitable for laser transitions •He-atoms help efficient excitation of Ne-atoms First gas laser ever developed ; Still one of … He-Ne: An atomic laser employs Four-level pumping scheme. laser - PUMPING The output of the laser light can be a continuous wave (cw) if the pumping is continuous or pulsed if the pumping is pulsed. We discuss mainly the self-trapped exciton in the alkali halides, which is a prime candidate for such a pumping scheme because it is known to produce strong electroluminescence. (8.1). First, the performance and reliability of quasi-continuous-wave (QCW) laser diodes as the pump source will be presented. Light from the pumping lamp(s) excites ground state particles into an absorption band, labelled 3 in the ﬁgure. For example, in ruby laser, xenon flash tube is used. The S30 and S32 pump laser modules leverage a revolutionary design and lean manufacturing processes to significantly advance the performance and scalability of 980 nm pumps. IAAST Vol 1  December 2010 2 temperature and had long lifetimes in the region of 100s to 1000s of hours. The module on the top is the flashlamp module and the module on the bottom is the laser rod module. N 1 to achieve the condition of population inversion between E 2 and E 1 at moderate pumping. The advantage of this method is that as the electrons passing three levels to ground state effective population inversion is achieved. b) Electric discharge: pumping: this type of pumping accomplished by means of intense electrical discharge in the medium and is particularly suited to gas media like He-Ne laser and CO 2 laser. The population inversion is achieved in this laser is by Electrical discharge method. The principles of diode pumping are simple.