The reason for the four level laser system to be more efficient than the three-level type needs to be explained. Concept introduction: In a normal system there are more atoms in the low energy states as compared to the number of atoms in the high energy states. Population inversion is said to occur when there are more atoms in the high energy states than in the low energy states.

Question

What are the advantages to using a near-IR excitation source, such as a diode laser (830 nm), instead of a source with a shorter wavelength, such as a krypton-ion laser (530.9 nm)? the ratio of anti-Stokes to Stokes intensities increases fluorescence is less intense or nonexistent can operate at higher powers without causing photodecomposition the amount of Rayleigh scattering decreases the Raman lines are more intense

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Question

Chapter 7, Problem 7.7QAP

Interpretation Introduction

Interpretation:

The reason for the four level laser system to be more efficient than the three-level type needs to be explained.

Concept introduction:

In a normal system there are more atoms in the low energy states as compared to the number of atoms in the high energy states. Population inversion is said to occur when there are more atoms in the high energy states than in the low energy states.

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