Intracavity pumped OPO system

An OPO system, comprising:

• a diode end pump laser source producing a primary oscillation source;
• and
• an OPO internal to the pump laser, the OPO is being insensitive to back reflections, the primary oscillation source being separated from an output light source of the (OPO) with created plasmas being non-reflected incident light back in a direction of propagation and back reflections from the plasma and do not cause energy fluctuations or beam profile variations, wherein a long-term energy variation of less than 0.3% and a short-term variation from cold startup of less than 1% RMS is achieved.