Characterization of a continuous-wave Raman laser in H_2

An intracavity frequency doubled H_2 Raman laser scheme for generating narrow-linewidth yellow radiation

“…A linewidth of 8 kHz was observed for a Raman laser [14] with intracavity parameters very similar to those considered here. Because the parameters associated with the Raman process are roughly the same, such as circulating Stokes power, we can also expect a linewidth in the tens of kHz; the linewidth of the output 583 nm radiation should be approximately twice the linewidth of the Stokes field, but we can still expect it to be less than 100 kHz.…”

“…Because the parameters associated with the Raman process are roughly the same, such as circulating Stokes power, we can also expect a linewidth in the tens of kHz; the linewidth of the output 583 nm radiation should be approximately twice the linewidth of the Stokes field, but we can still expect it to be less than 100 kHz. Beyond citing a measured linewidth with similar experimental parameters to those modeled here, it is quite difficult to confidently predict a laser linewidth, as it depends so heavily on the specific cavity design, but it is important to note that the Raman process itself is not the limiting factor in this respect; a well-designed and well-isolated optical cavity is predicted to achieve Stokes linewidths even in the sub-kHz regime [14].…”

“…Another very significant source of loss is the scattering from the nonlinear SHG crystal in the cavity characterized by κ, where κ is the transmission through crystal. The round trip loss coefficient, following the convention of Brasseur et al, is then [14] L ps c l ln R 1 ps R 2 ps R 3 ps R 4 ps κ ps q .…”

“…Carlsten and colleagues have laid the theoretical foundation for Raman gas-based CW lasers [14,15], and high-power Raman lasers in such systems have been constructed with H 2 or D 2 pressures ranging from 0.1 atm to 10 atm [16,17]. Cavity-based SRS with diatomic gas has also been proposed as a method for the construction of molecular modulators [18] for use in ultrashort pulse generation, and experimental progress has been made toward this goal as well [19,20].…”

Characterization of Single-Crystal Synthetic Diamond for Multi-Watt Continuous-Wave Raman Lasers

“…It is also possible to build continuous-wave Raman lasers based on an external cavity, as demonstrated by Brassuer et al using hydrogen gas as the Raman material [12], Grabtchikov et al using potassium gadolinium tungstate (KGd(WO 4 ) 2 -known as KGW) [13], and recently at higher average powers by Kitzler et al using diamond [14]. In quasi continuous-wave operation, Kitzler et al demonstrated impressive on-time output powers of 7.5W in 6.5ms pulses.…”