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Chapter 10: Q66E (page 470)

Question: In a diode laser electrons dropping from the conduction band across the gap, and into the valence band produce the photons that add to the coherent light. The ZnTe laser has a band gap of 2.25 eV. About what wavelength laser light would you expect it to produce?

Short Answer

Expert verified

Answer

The wavelength of the light is 551nm .

Step by step solution

01

Given data

The ZnTe Laser light has a band gap of 2.25eV

02

Concept of the energy of a photon

The energy of a photon is related to the frequency f is, E=hf.

The frequency of a related to the wavelength is, f=cλ.

Here c is speed of light.

From the above two equations the resultant equation is, E=hcλ.

03

Determine the wavelength of laser light 

The energy of a photon is, E=hcλ.

Rearrange the above equation for λisλ=hcE.

Substitute 1240 eV.nm for hc and 2.25 eV for E in above equation.

λ=hcE=1240 eV.nm2.25 eV=551 nm

Therefore, the wavelength of the light is 551nm.

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