Single longitudinal mode oscillations in the converging-straight-diverging dye cell pumped by a 9 kHz copper vapor laser

Characterization of dye cells for a high-repetition-rate pulsed dye laser by particle image velocimetry (PIV)

“…To study the several flow-related parameters for a dye laser beam of reasonably good quality, we have developed a computational model to avoid extensive, time-consuming experimental studies for obtaining a suitable dye flow channel. We have computationally evaluated the designs of flow channel for a dye cell that are suitable for a pulsed dye laser in a general-purpose computational fluid dynamics (CFD) code and the details of the CFD model have been reported earlier [7,16,27]. In CFD the equations governing the flow and their interaction between fluid and flow channel have been solved numerically.…”

“…In CFD the equations governing the flow and their interaction between fluid and flow channel have been solved numerically. Several dye cell flow geometries, such as rectangular, converging-diverging and converging-straightdiverging, with different types of flow entry and flow exit, and different cross-sectional areas and flow channel lengths, were studied and optimized using the CFD model [16,27]. These dye cells have been used in high-repetition-rate pulsed dye lasers and the results were published elsewhere [2,27,28].…”

“…Several dye cell flow geometries, such as rectangular, converging-diverging and converging-straightdiverging, with different types of flow entry and flow exit, and different cross-sectional areas and flow channel lengths, were studied and optimized using the CFD model [16,27]. These dye cells have been used in high-repetition-rate pulsed dye lasers and the results were published elsewhere [2,27,28]. The hydrodynamic resistance of the dye cell must be as small as possible to reduce the pressure drop across it.…”

“…It has been reported that the flow geometry, flow entry to the cell and flow cross-sectional area of the rectangular dye cell are important parameters for eliminating flow circulations [16]. Two types of dye cells, namely type I and type II, have been fabricated based on our computational results [27]. Type I has flow dimensions of 1 × 16 × 80 mm 3 while type II has dimensions of 1 × 5 × 55 mm 3 .…”

“…The type-II dye cell was also made of four optical quality polished quartz blocks. The flow channel of the type-II dye cell has a fillet radius of 3 mm at the inlet of the flow channel with a straight length of 6 mm and a diverging angle of 6.73° [27]. The fluid enters this flow channel from a header area of 7 × 5 mm 2 and the Flexible Teflon tubing of 6 mm outer diameter was used to connect the dye cell with the DFS.…”