Long cavity laser system including frequency doubling long cavity fiber optic laser system

A frequency doubled polarization controlled laser system receiving a pump laser beam, comprising:

• a long laser cavity which suppresses output power fluctuations, said long laser cavity, including:
• first and second dichroic reflectors;
• a rare earth doped dual core optical fiber disposed between said first and second dichroic reflectors which amplifies the pump laser beam to thereby produce an amplified laser beam;
• a polarization controller which controls polarization of said amplified laser beam;
• a polarization selector which selects said polarization of said amplified laser beam;
• and
• a frequency doubling optical subsystem which converts said amplified laser beam into a frequency doubled laser beam.

A frequency doubled polarization controlled laser system receiving a pump laser beam, comprising:

• a long laser cavity which suppresses output power fluctuations, said long laser cavity, including:
• first dichroic reflector means for transmitting the pump laser beam and reflecting an amplified laser beam;
• rare earth doped dual core optical fiber means for amplifying the pump laser beam to thereby produce said amplified laser beam;
• polarization controller means for controlling polarization of said amplified laser beam;
• polarization selector means for selecting said polarization of said amplified laser beam;
• frequency doubling means for converting said amplified laser beam into a frequency doubled laser beam;
• and
• second dichroic reflector means for transmitting said frequency doubled laser beam and reflecting said amplified laser beam.

A frequency doubled polarization controlled laser system receiving a pump laser beam, comprising:

• a long laser cavity which suppresses output power fluctuations, said long laser cavity, including:
• first dichroic reflector means for transmitting the pump laser beam and reflecting an amplified laser beam;
• polarizing rare earth doped optical fiber means comprising first means for amplifying the pump laser beam to thereby produce said amplified laser beam, second means for controlling polarization of said amplified laser beam, and third means for selecting said polarization of said amplified laser beam;
• frequency doubling means for converting said amplified laser beam into a frequency doubled laser beam;
• and
• second dichroic reflector means for transmitting said frequency doubled laser beam and reflecting said amplified laser beam.

A method for generating a frequency doubled polarization controlled laser beam responsive to a pump laser beam in a laser system having a long laser cavity which suppresses output power fluctuations and including at least one rare-earth doped dual core optical fiber producing a gain, the method comprising steps for:

• selectively transmitting the pump laser beam into a first end of the long laser cavity while reflecting an amplified laser beam at said first end of the long laser cavity;
• amplifying the pump laser beam to thereby produce said amplified laser beam;
• selecting a polarization characteristic of said amplified laser beam and controlling the polarization state of said amplified laser beam to thereby provide a polarization controlled laser beam;
• converting said polarization controlled laser beam into a frequency doubled laser beam;
• and
• selectively transmitting said frequency doubled laser beam out of a second end of the long laser cavity while reflecting said polarization controlled laser beam at the second end of the long laser cavity.

A method for generating a polarization controlled laser beam responsive to a pump laser beam in a laser system having a long laser cavity which suppresses output power fluctuations and including at least one rare-earth doped dual core optical fiber producing a gain, the method comprising steps for:

• selectively transmitting the pump laser beam into a first end of the long laser cavity while reflecting an amplified laser beam at said first end of the long laser cavity;
• amplifying the pump laser beam to thereby produce said amplified laser beam;
• selecting a polarization characteristic of said amplified laser beam and controlling the polarization state of said amplified laser beam to thereby provide a polarization controlled laser beam;
• and
• selectively transmitting said polarization controlled laser beam out of a second end of the long laser cavity while reflecting said amplified laser beam at the second end of the long laser cavity.