First-order thermal insensitivity of the frequency of a narrow spectral hole in a crystal
First-order thermal insensitivity of the frequency of a narrow spectral hole in a crystal
The possibility of generating a narrow spectral hole in a rare-earth doped crystal opens the gateway to a variety of applications, one of which is the realization of an ultrastable laser. As this is achieved by locking in a prestabilized laser to the narrow hole, a prerequisite is the elimination …