The external power efficiency of an injection laser with a GaAs is 13% having band gap energy of 1.64 eV. Determine external power efficiency.a.0.366b.0.198c.0.467d.0.283

Monochromatic light of frequency of 6×10^14 Hz is produced by a laser. Power emitted is 4×10−3W. Approximately how many photons per second are emitted by the source?

A certain laser transition emits 6.0 x 1015 quanta per second per square meter of λ = 662.6 nm.What is the power output in joule per second per square meter?

Monochromatic light of frequency 6×1014 Hz is produced by a laser. The power emitted is 2×10−3 W(i) What is the energy of the photon in the light beam?(ii) How many photons per second, on an average are emitted by the source ?

The Responsivity of photodiode is 0.294 A/W at wavelength of 0.90 μm. Determine quantum efficiency.a.0.249b.0.654c.0.405d.0.914

A laser pointer delivers 0.10-mW average power in a beam 0.90 mm in diameter. Find (a) the average intensity, (b) the peak electric field, and (c) the peak magnetic field.