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Particularly xenon lamps are quite common as broadband emitters of white light. Most flash lamps are based on noble gases like xenon, krypton or argon. Typical shapes of lamp electrodes for arc lamps and flash lamps in laser applications.

The glass envelope is often somewhat thicker for increased mechanical robustness.

Also, it is necessary to use electrode seals which have a low enough electrical resistance to apply the high peak currents that largely excludes the use of ribbon seals, for example.

One tries to obtain a smooth distribution of the current, avoiding “hot spots” which might lead to sputtering of cathode material.

While arc lamps may have pointed cathodes, it is usually better to use rounded electrode shapes (see Figure 1), using a larger surface area, for flash lamps, which are operated with high peak currents.

The outer appearance of a flash lamp is often quite similar, but there can be various differences, particularly concerning the metal electrodes: This is in contrast to arc lamps, which are designed to be operated continuously.

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