Pulsed Multiple Colour Laser System

A two-step holographic printer comprising a pulsed multiple colour laser system, said pulsed multiple colour laser system comprising:

• a first active laser element provided in a first laser cavity, said first active laser element comprising Nd:YLF and wherein said first active laser element is arranged to generate laser radiation at a first fundamental frequency;
• means for arranging the laser mode within said first laser cavity to be single longitudinal mode;
• means for frequency doubling said laser radiation at said first fundamental frequency to provide laser radiation at a first frequency doubled frequency;
• means for frequency trebling said laser radiation at said first fundamental frequency to provide laser radiation at a first frequency trebled frequency;
• a second active laser element provided in a second laser cavity separate from said first laser cavity, said second active laser element comprising Nd:YLF and wherein said second active laser element is arranged to generate laser radiation at a second fundamental frequency;
• means for frequency doubling said laser radiation at said second fundamental frequency to provide laser radiation at a second frequency doubled frequency;
• and
• means for arranging the laser mode within said second laser cavity to be single longitudinal mode;
• wherein the output of said pulsed multiple colour laser system comprises:
• first laser radiation at said first frequency doubled frequency;
• second laser radiation at said first frequency trebled frequency;
• and
• third laser radiation at said second frequency doubled frequency;
• and
• wherein the two-step holographic printer is configured to use the first, second and third laser radiation output from the pulsed multiple colour laser system to produce a hologram.

A two-step holographic printer comprising a pulsed multiple colour laser system, said pulsed multiple colour laser system comprising:

• a first active laser element provided in a first laser cavity, said first active laser element selected from the group consisting of:
• (i) Nd:YAP;
• (ii) Nd:BEL;
• and (iii) Nd in a host matrix other than YLF, YAG, YAP and BEL, and wherein said first active laser element is arranged to generate laser radiation at a first fundamental frequency;
• means for arranging the laser mode within said first laser cavity to be single longitudinal mode;
• means for frequency doubling said laser radiation at said first fundamental frequency to provide laser radiation at a first frequency doubled frequency;
• means for frequency trebling said laser radiation at said first fundamental frequency to provide laser radiation at a first frequency trebled frequency;
• a second active laser element provided in a second laser cavity separate from said first laser cavity, said second active laser element selected from the group consisting of:
• (i) Nd:YAP;
• (ii) Nd:BEL;
• and (iii) Nd in a host matrix other than YLF, YAG, YAP and BEL, and wherein the second laser element is arranged to generate laser radiation at a second fundamental frequency;
• means for frequency doubling said laser radiation at said second fundamental frequency to provide laser radiation at a second frequency doubled frequency;
• and
• means for arranging the laser mode within said second laser cavity to be single longitudinal mode;
• wherein the output of said pulsed multiple colour laser system comprises:
• first laser radiation at said first frequency doubled frequency;
• second laser radiation at said first frequency trebled frequency;
• and
• third laser radiation at said second frequency doubled frequency;
• and
• wherein the two-step holographic printer is configured to use the first, second and third laser radiation output from the pulsed multiple colour laser system to produce a hologram.