Efficiency of lasing dye media in pumping high-power radiation with nanosecond pulses
Abstract
The causes of laser pumping efficiency drop are investigated in an experimental study with several dye solutions. Rhodamine and oxazine solutions are excited by second harmonic emission pulses of 50 ns duration and 5 J maximum energy from a neodymium-glass laser. Polymethyne solutions are excited by second harmonic emission pulses are 20 ns duration and 5 J maximum energy from a ruby laser. The dependence of the emission efficiency on the pumping power density and on the width of the excitation zone, also of the gain and the transmission coefficient on the pumping power density is determined for rhodamines 6G and 4S, oxazine 17 in ethanol, and polymethyne No. 5364. The results reveal peaking of the efficiency and the output energy at an optimum power pumping density and at an optimum width of the excitation zone. At output power levels higher than optimum the efficiency decreases because of increasing superluminescence.
- Publication:
-
USSR Rept Phys Math JPRS UPM
- Pub Date:
- August 1984
- Bibcode:
- 1984RpPhM.......51B
- Keywords:
-
- Dyes;
- Efficiency;
- Laser Outputs;
- Laser Pumping;
- Luminous Intensity;
- Amplification;
- Emission;
- Harmonic Excitation;
- Light Transmission;
- Rhodamine;
- Lasers and Masers