Lasers is the most mature form of:-Select one:a. Electromagnetic energy weaponsb. Electrochemical energy weaponsc. Directed energy weaponsd. None of the above

One of the following lasers are generally not used for industrial applications.a.CO2 laserb.He-Ne laserc.Nd-YAG laserClear my choice

The use of lasers in military fields to guide missiles depends on....1) wave nature of laser light2) Coherence of photons of laser beam3) Laser beam energy4) Spectral purity of laser beam

The number of energy levels required to get a practical laser will bea.4b.2c.3

He-Ne laser utilizesa.Optical pumpingb.Electrical discharge and atom-atom collisionc.Electrical discharge

Electrical pumping is adopted in ____________laser