Doubler
Doubler turns up in 2 fields: photonics, metallurgy. Here is what it means to the people in each one.
Doubler in photonics
Lab slang for the frequency-doubling crystal or module that turns an infrared laser into its second harmonic.
The crystal, oven and mount assembly that does second harmonic generation, or a complete add-on module for that job. A doubled YAG makes 532 nm green from 1064 nm, and doubled Ti:sapphire makes blue around 400 nm. Tripler and quadrupler follow the same naming for third and fourth harmonics, and people say the doubler is detuned when conversion drops.
"Green output's fine, the doubler's peaked, the IR leak behind the separator is the thing that worries me."
Doubler in metallurgy
A historic rolling mill worker who folded hot metal sheets to be rolled again.
A historic mill worker responsible for grabbing hot sheet metal as it exited the rolls, folding it over on itself, and feeding it back into the mill. This doubling process allowed the mill to produce thinner gauges of sheet iron or tinplate than a single pass could achieve. The job required immense stamina and precise timing to handle the red-hot metal safely.
"My grandfather started in the tinplate works as a doubler, folding the hot sheets with heavy tongs."