Laser system with wavelength converter
a laser system and wavelength converter technology, applied in semiconductor lasers, laser details, instruments, etc., can solve the problems of laser instability, increased noise, and increased intensity noise in the laser system, and achieve the effect of optimizing the intensity noise properties of the laser and reducing the noise properties of the diode laser
Active Publication Date: 2018-07-03
DANMARKS TEKNISKE UNIV
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Benefits of technology
The system achieves low noise properties and reduced complexity, enabling more efficient and cost-effective high-power laser systems suitable for various applications, including Ti:sapphire laser pumping and medical treatments.
Problems solved by technology
Intensity noise in a laser system occurs due to variations in the lasers effect, i.e. the amount of light emitted.
Near these mode-hops the laser will be more unstable and therefor more noisy.
Method used
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[0036]FIG. 1 is a block-diagrammatical illustration of a DPSS laser pumped Ti:sapphire laser. In system for providing high-power laser light in the ultraviolet and visible spectral region, wavelengths below 700 nm and in particular around 500 nm, diode pumped solid state (DPSS) lasers are the common choice of laser source. These DPSS laser are typically based on the gain media neodymium-doped yttrium iron garnet (Nd:YAG), neodymium-doped yttrium ortho-vanadate (Nd:YVO4), neodymium-doped yttrium lithium fluoride (Nd:YLF) or similar materials doped with either neodymium, ytterbium, thulium, holmium, praseodymium or erbium. These DPSS laser materials provide a wide selection of emission wavelengths in the visible and the near infrared spectral range. The emission wavelengths in the visible spectral range can be used directly, while the near infrared wavelengths need frequency conversion to reach the visible or ultraviolet range. This frequency conversion is typically performed as secon...
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The present invention relates to an apparatus comprising a diode laser (10) providing radiation in a first wavelength interval, a radiation conversion unit (12) having an input and an output, the radiation converter configured to receive the radiation in the first wavelength interval from the diode laser at the input, the radiation conversion unit configured to convert the radiation in the first wavelength interval to radiation in a second wavelength interval and the output configured to output the converted radiation, the second wavelength interval having one endpoint outside the first wavelength interval. Further, the invention relates to a method of optically pumping a target laser (14) in a laser system, the laser system comprising a laser source providing radiation at a first frequency, the laser source being optically connected to an input of a frequency converter, the frequency converter configured to convert the radiation at the first frequency to a second, different frequency, the target laser arranged in optical communication with an output of the frequency converter, the method comprising the steps of emitting radiation from the laser source, receiving the radiation at the frequency converter, converting the radiation from the first frequency to the second frequency in the frequency converter, and providing the radiation at the second frequency at the target laser so that the target laser is optically pumped.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a reissue of U.S. patent application Ser. No. 13 / 819,812, now U.S. Pat. No. 8,670,474, which is the U.S. national stage entry of International Patent Application No. PCT / DK2011 / 050344, filed on Sep. 14, 2011, which claims priority to U.S. Provisional Patent Application No. 61 / 382,609, filed on Sep. 14, 2010 and International Patent Application No. PCT / DK2011 / 050091, filed on Mar. 18, 2011, the contents of all of which are herein fully incorporated by reference.[0002]The present invention relates to applications of frequency converted diode laser systems. In particular the present invention relates to high power tunable, low-noise, frequency converted diode laser systems. The invention further relates to different applications, including but not limited to, such as use of a frequency converted diode laser system for optical pumping of gain medium in solid state laser oscillators and amplifiers, spectroscopy applications...
Claims
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IPC IPC(8): H01S3/00H01S5/062H01S5/00H01S5/068
CPCH01S3/09415H01S5/06817H01S5/02469H01S5/0092H01S2301/02H01S5/4012H01S5/0265H01S5/0683H01S5/1014H01S5/0625G02F1/35H01S5/068H01S5/062
Inventor JENSEN, OLE BJARLINANDERSEN, PETER ESKILPETERSEN, PAUL MICHAEL
Owner DANMARKS TEKNISKE UNIV