Intracavity frequency conversion in solid-state laser resonator with end-pumping

A laser apparatus with intracavity frequency conversion, comprising:

• a laser resonator including:
• a solid-state gain medium,
• a nonlinear crystal, and
• an adjustable loss element arranged to impose an adjustable loss on the laser resonator, wherein imposing the adjustable loss on the laser resonator includes out-coupling a fraction of an intracavity laser beam from the laser resonator;
• a pump laser for generating a pump laser beam having a pump power and arranged to end-pump the gain medium so as to generate an intracavity laser beam circulating in the laser resonator and undergoing partial frequency-conversion in the nonlinear crystal to generate a frequency-converted laser beam having an output power;
• one or more sensors for monitoring the output power and at least one output beam parameter of the frequency-converted laser beam, the at least one output beam parameter being selected from the group consisting of beam waist size, beam waist location, beam divergence angle, and beam quality factor;
• and
• a controller configured to control the output power and the at least one output beam parameter by adjusting the pump power and the loss according to monitored values of the output power and the at least one output beam parameter.