摘要:
The invention presents a scheme overcoming power and energy limitations of state- of-the-art multi-pass laser oscillator. Multi-pass oscillators designed according to this disclosure show improved stability properties for variations of the active medium thermal lens enabling scalability to an arbitrary number of passes though the active medium. This invention applies in particular to high-average power, high-energy mode-locked lasers and to thin-disk lasers. The invention utilizes the soft aperture effect occurring in pumped active media to realize a multi-pass oscillator whose range of stability for variations of the thermal lens in the active medium is similar to the stability achievable with a single pass oscillator. The roundtrip in such a multi- pass oscillator is given by a sequence of segments with identical layout. The ray transfer matrix of this segment describes a stable optical ring resonator. This is a considerable advantage compared to present multi-pass designs where the stability region is shrinking linearly with the number of passes, as these are based on imaging.
摘要:
In some embodiments, the present invention provides for a laser pump chamber, including: at least one laser gain medium, at least one excitation source, and at least one diffuse reflector to direct and redirect an emission from the excitation source into the laser gain medium, wherein the at least one diffuse reflector is made from a diffuse reflector material comprising at least one of: 1) white quartz and 2) BaS04.
摘要:
A laser source comprising a laser beam generating unit (2), including one or more diode laser sources (20), for generating a first laser beam and an optical amplification unit (6), including at least one amplificator module (60) adapted to be pumped with laser light derived from said first laser beam emitted by said generating unit (2) and to emit a second laser beam at its output having a higher beam quality and a lower power value with respect to said first laser beam coming from said generating unit (2). Between said generating unit (2) and said optical amplification unit (6) there is interposed a laser beam shifting and addressing optical unit (4) which includes an optical path selector device (43), adapted to direct said first laser beam coming from said generating unit (2) selectively towards a first optical line (44), for emission of a laser beam having a relatively higher power value and a relatively lower quality at a first outlet (U1 ) of said laser source (1 ) or towards a second optical line (45), for generating the emission of the laser beam having a relatively lower power value and a relatively higher quality at a second outlet (U2) of said laser source (1 ).
摘要:
In various embodiments, wavelength beam combining laser systems incorporate optics having optical power along the non-WBC direction (and/or the slow-diverging axis) of the combined multi-wavelength beam proximate to or combined with the partially reflective output coupler in order to correct pointing variation in the non-WBC direction (and/or the slow-diverging axis).
摘要:
A frequency tuneable laser device comprises a cavity mode selector (10) and a cavity tuning arrangement(22, 24). The cavity mode selector (10) has a frequency response with a selection feature that is alignable in frequency with a selected cavity mode of the laser device. The cavity tuning arrangement (22, 24) comprises a plurality of reflective elements arranged in optical series, and is used to adjust the effective optical path length of the laser cavity to move the cavity modes in frequency. The laser device further comprises means (30, 40) for making the cavity mode selector (10) and the cavity tuning arrangement (22, 24) perform a simultaneous coordinated movement such that respective frequencies of the selection feature and the selected cavity mode vary with substantially the same dependence on a parameter characterising the simultaneous coordinated movement. For example, a periscope (22, 24) with a co- rotating etalon (10) can be used to provide mode hop free tuning of the laser device, particularly where the periscope (22, 24) is configured to give a predominantly cosine tuning response.
摘要:
The present invention describes a mode locking semiconductor disk laser (SDL). The laser comprises a resonator terminated by first and second mirrors (6,7) and folded by a third mirror. The third mirror comprising a semiconductor disk laser (8) suitable for generating a resonator field comprising a predetermined central wavelength A O while the second mirror comprising an intensity saturable mirror (7) suitable for mode locking the resonator field at the predetermined wavelength. The reflectivity of the of the resonator at the central wavelength A O is reduced by shifting the reflectivity profiles of the first and or second mirrors to wavelength shorter than the predetermined wavelength so as to suppress gain at wavelengths longer than the central wavelength A O . By mismatching the reflectivity profile (32) of the second mirror (7) to that of the desired output wavelength (3) provides a stable mode locked laser with significantly reduced noise. The SDL may comprise a DBR with a reflectivity profile (1) having a peak wavelength corresponding to the laser emission (3). The gain medium comprises a RPG structure of the active region resulting in a Fabry-Perot with a FSR as indicated by the corresponding reflectivity profile (2). The peak reflection of the DBR of the saturable absorber mirror may be shifted towards shorter wavelengths with respect to the laser emission by an amount corresponding to one half to one FSR of said RPG active region.
摘要:
Die Erfindung betrifft eine Laseranordnung zur Erzeugung einer zweifach frequenzkonvertierten Laserstrahlung, die folgendes aufweist: ein aktives Medium (5), das durch Einstrahlung von Pumplicht (2) eine erste Laserstrahlung (6) mit einer ersten Frequenz erzeugt; einen ersten Laserresonator (11), innerhalb dessen die erste Laserstrahlung (6) in Resonanz umläuft; einen ersten nichtlinearen Kristall (9), der innerhalb des ersten Laserresonators (11) angeordnet ist und der dazu vorgesehen und eingerichtet ist, die erste Laserstrahlung (6) in eine zweite Laserstrahlung (10) mit einer zweiten Frequenz, die höher als die erste Frequenz ist, zu konvertieren; einen zweiten Laserresonator (14), innerhalb dessen die zweite Laserstrahlung (10) in Resonanz umläuft; einen zweiten nichtlinearen Kristall (16), der innerhalb des zweiten Laserresonators (14) angeordnet ist und der dazu vorgesehen und eingerichtet ist, die zweite Laserstrahlung (10) in eine dritte Laserstrahlung (17) mit einer dritten Frequenz, die höher als die zweite Frequenz ist, zu konvertieren, wobei der erste Laserresonator (11) und der zweite Laserresonator (14) derart zueinander angeordnet sind, dass sie einen gemeinsamen optischen Abschnitt (15) aufweisen, welcher sowohl von der im ersten Laserresonator (11) umlaufenden ersten Laserstrahlung (6) als auch von der im zweiten Laserresonator (14) umlaufenden zweiten Laserstrahlung (10) durchstrahlt wird. Die Erfindung zeichnet sich dadurch aus, dass der erste Laserresonator (11) und das aktive Medium (5) derart ausgebildet und angeordnet sind, dass die erste Laserstrahlung (6) aus genau zwei benachbarten Longitudinalmoden (30, 31) mit zwei Frequenzen besteht, wobei die erste Frequenz der ersten Laserstrahlung (6) eine Summenfrequenz dieser beiden Frequenzen ist, und dass der zweite Laserresonator (14) eine optische Weglänge aufweist, die eine Resonanz lediglich einer einzigen Longitudinalmode der zweiten Laserstrahlung (10) zulässt.
摘要:
The invention relates to a laser device comprising at least three linear laser gain volumes (12) for a gas to be excited, connecting elements (20) for connecting adjacent laser gain volumes, the laser gain volumes being mechanically coupled to other, and forming a common volumetric space, excitation means (50) for the laser gain volumes for exciting the gas in the laser gain volumes for generating a laser light, mirrors (22) arranged in the connecting elements for reflecting laser light between the laser gain volumes, a totally reflecting rear mirror (44), and a partially reflecting output coupler (42) for coupling out a laser beam. The laser gain volumes are arranged in the shape of an open or closed ring surrounding a free central space (8) between them. The invention also relates to a method for marking an object.