By Jonathan L. Rosner

Court cases of the Theoretical complex research Institute in ordinary Particle Physics, held June 4-30, 2000 in Boulder, Colorado. dedicated to the extensive topic of taste physics, embracing the query of what distinguishes one kind of basic debris from one other.

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It is relatively straightforward to apply this approach to diode lasers for absorption gas sensors, since large laser power is not required. In contrast, different approaches are used to achieve single axial-mode operation for edge-emitting and surface-emitting lasers. Therefore, this section will emphasize the mechanisms for achieving single axial-mode operation. 8 illustrates the far-field angular distribution of the optical intensity of an edge-emitting laser. Guiding of the optical field in the transverse direction (perpendicular to the layers of the structure) is obtained by the double heterostructure described in the last section.

There are several common ways to achieve this. 12). This method is adopted for the 760-nm VCSELs used in this thesis for oxygen measurements. 14). 4 Laser dynamics The detailed dynamics of semiconductor lasers as we modulate them at high speeds is rather complicated, especially when the modulation amplitude is large. However, for modulation spectroscopy applications, the modulation amplitude is typically small, and thus the relatively simple rate-equation model can be used to understand the phenomena with reasonable accuracy.

Since laser relative intensity noise (RIN) limits the best achievable detection sensitivity, lasers 46 Semiconductor Diode Laser Fundamentals usually operate well above threshold to obtain low RIN. Under this condition, the spontaneous emission term Γ Rsp' in Eq. 16) can be neglected. The gain increases with increasing carrier density while it decreases with increasing photon number density. 17) where ε is the gain compression factor introduced to reflect the effect of photon density on the gain; N s is a parameter introduced that the gain does not go to infinity at zero carrier number density; and N tr is the number density at which the material just reaches transparency.

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