A single-transverse-mode laser has a resonance cavity with an output end. A
gain medium is disposed within the resonance cavity. The gain medium
portion includes an active portion. A mode expander portion is disposed
within the resonance cavity and operationally coupled to the gain medium
portion and the output end of the resonance cavity. A single-mode
waveguide portion is disposed with the resonance cavity between and
operationally coupled to the mode expander portion of the output end of
the resonance cavity. The single-mode waveguide portion is a passive
portion. The gain medium portion, the mode expander portion and the
single-mode waveguide portion are integrally formed.
