MOGlabs CEF, Manual

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1. Introduction
Semiconductor laser diodes are compact, efficient and low-cost, but usu-
ally have poor wavelength control, linewidth and stability. The addition
of an external frequency-selective cavity allows control of the operating
wavelength over a few nm range, with sub-MHz linewidth and stability.
The MOGL abs CEL (see Fig. 1.1) is machined from a solid aluminium block,
so that the laser is stable, robust, and insensitive to acoustic disturbances.
The cavity is hermetically sealed for additional suppression of environmen-
tal fluctuations and drift.
The MOGL abs CEL is a “cat-eye” design (see Fig. 1.2), in which an ex-
ternal cavity is formed between the rear reflecting surface of the semi-
conductor diode, and a cat-eye reflector at several centimetres from the
Figure 1.1:
The MOGLabs CEL cateye laser.
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