  We propose a method for building a squeezed vacuum state laser with zero
diffusion, which results from the introduction of the reservoir engineering
technique into the laser theory. As well as the reservoir engineering, our
squeezed vacuum laser demands the construction of an effective atom-field
interaction. And by building an isomorphism between the cavity field operators
in the effective and the Jaynes-Cummings Hamiltonians, we derive the equations
of our effective laser directly from the conventional laser theory. Our method,
which is less susceptible to errors than reservoir engineering, can be extended
for the construction of other nonclassical state lasers, and our squeezed
vacuum laser can contribute to the newly emerging field of gravitational
interferometry.
