New PDF release: 50.Quantum Electronics

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For efficient dyes, unidirectional ring lasers produce almost twice the single-mode output power as that from linear cavity lasers. However, with low gain dyes the increase in threshold due to the insertion loss of the unidirectional device results in lower efficiency than in the linear cavity. , the time-averaged linewidth and its tunability). The linewidth is determined by fluctuations in the cavity length caused by vibration, fluctuations in the dye jet thickness, ambient air pressure fluctuations, and drifts in 87 the cavity length caused by thermal expansion.

Xenon-filled flashlamps of linear or coaxial design are generally used for pumping dye lasers. Linear flashlamps have a tubular quartz envelope with tungsten electrodes sealed at the ends. A shortduration high-voltage pulse applied to the electrodes results in intense emission over a large spectral range (Fig. 1). This is coupled to the dye solution by suitably designed enclosures with specular reflectors for imaging the lamp on the dye solution. The dye solution is flown through a cell made of fused silica at a fast speed for removal of heated dye solution between pump pulses.

The former enables production of short-duration pulses, and the latter ensures larger separation between pulses with a cleaner baseline. Dye lasers, with broad spectral widths, have played a central role in the development of ultra-short-duration light pulses and investigation of ultrafast processes in nature. Amplification of ultrashort (ȁ100 fs) dye laser pulses in high-energy excimer laser amplifiers, with prior frequency conversion when necessary, has produced few 100 fs pulses with 1 TW (terawatt) to 4 TW output power in the blue UV region (11).

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50.Quantum Electronics by John G. Webster (Editor)

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