Light Age, Inc.'s PAL/PRO™ laser system is a flashlamp pumped, unidirectional, pulsed ring oscillator. It employs DLIS and ACLS technologies to achieve incredibly precise tuning and wavelength stability in its ultranarrow spectral bandwidth, single longitudinal mode output.

Diode Laser Injection Seeding (DLIS) is a revolutionary new way to control the frequency of a tunable laser. The DLIS system works by injecting photons from an external cavity diode laser, or other narrowband cw laser source having the proper spectral characteristics, into the resonator of a pulsed laser. This injection is done by a unique light coupling system. The ACLS system fires the pulsed laser when its cavity length exactly matches the frequency of the injected light. The laser pulse builds up by preferentially amplifying the injected photons over its own spontaneous emission. When this is done correctly essentially all of the light of the pulsed laser is produced at the frequency of the injected light. As a result nearly ideal single longitudinal mode (SLM) output is generated. Moreover, since this technique does not require lossy elements to be introduced into the pulsed laser's cavity there is no reduction of laser efficiency or output power, and there are no sensitive frequency control elements (e.g., etalons or gratings) to heat up and drift. The high power pulsed laser output can then be controlled, stabilized or tuned as readily and accurately as the cw injection source.