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AssigneeDanmarks Tekniske Universitet
InventorsOle Bjarlin Jensen, Peter Eskil Andersen, Paul Michael Petersen, André Müller
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A method of controlling beam quality and stability of a laser apparatus, the laser apparatus comprising, a diode laser (10) providing first radiation of at least a first wavelength, and a frequency conversion unit (12) configured to frequency-convert the first radiation from the diode laser and to output the frequency-converted radiation (213), the frequency-converted radiation having at least a second wavelength different from the first wavelength, the diode laser (10) comprising at least a first and a second section (222,223), a first contact (220) for injecting a first current (I1) into the first section (222), a second contact (221) for injecting a second current (I2) into the second section (223), and means for controlling a temperature of the diode laser; wherein the method comprises monitoring a first parameter indicative of the power content of a dominant lobe of the first radiation; iteratively determining a combination of respective values of the first current, the second current and the temperature at which combination of respective values the monitored first parameter and a stability parameter indicative of a fluctuation over time of the monitored first parameter each fulfils a respective predetermined optimization criterion; and setting the first current, the second current, and the temperature to the determined combination of respective values.
A method of controlling beam quality and stability of a laser apparatus, the laser apparatus comprising, a diode laser providing first radiation of at least a first wavelength, and a frequency conversion unit configured to frequency-convert the first radiation from the diode laser and to output the frequency-converted radiation, the frequency-converted radiation having at least a second wavelength different from the first wavelength, the diode laser comprising at least a first and a second section, a first contact for injecting a first current into the first section, a second contact for injecting a second current into the second section, and means for controlling a temperature of the diode laser;
A method according to any one of the preceding claims, wherein the predetermined optimization criterion to be fulfilled by the first parameter comprises the first parameter being at least approximately maximised and above a predetermined threshold;
A method according to any one of the preceding claims, comprising measuring the power of the frequency-converted radiation, and adjusting the temperature of the frequency-converter unit until the measured power of the frequency-converted radiation is maximised or above a predetermined threshold.
A method according to any one of the preceding claims, wherein the diode laser is adapted to provide radiation in a single-frequency output.
A method according to any one of the preceding claims, wherein the frequency conversion unit includes a non-linear optical material.
A method according to any one of the preceding claims, wherein the frequency conversion unit is adapted to double the frequency of the radiation from the diode laser.
A method according to any one of the preceding claims, further comprising providing the frequency-converted radiation to a target laser so that the target laser is optically pumped.
A laser apparatus comprising:
Dependencies are inferred from the claim text.