Fig. 4: Maser threshold diagram.
From: Maser threshold characterization by resonator Q-factor tuning
a Maximal maser emission power \(\left\vert {A}_{{{{{{{{\rm{M}}}}}}}}}\right\vert\), in logarithmic units, of the central hyperfine maser transition line as a function of laser pump rate wL and the loaded quality factor QL of the resonator. The white and gray dashed lines represent the theoretical threshold for masing, with and without temperature effects, respectively. b \(\left\vert {A}_{{{{{{{{\rm{M}}}}}}}}}\right\vert\) as a function of QL for two wL, indicated by the purple and red dashed lines in (a). c \(\left\vert {A}_{{{{{{{{\rm{M}}}}}}}}}\right\vert\) as a function of wL at two QL, indicated by the blue and green dashed lines in (a).
