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公开(公告)号：US20180233877A1
公开(公告)日：2018-08-16
申请号：US15891343
申请日：2018-02-07
发明人： Thomas UDEM , Akira OZAWA
CPC分类号： H01S3/1121 , G01J3/0218 , G01J3/10 , G01J3/4338 , G01J9/04 , G01J2003/282 , G01J2003/4332 , G01N21/39 , G01N2021/391 , G01N2021/399 , G01N2201/0697 , H01S3/0057 , H01S3/0675 , H01S3/06791 , H01S3/1109 , H01S3/1112
摘要： A method of generating laser pulses (1) includes: creating a circulating light field in resonator device (11) having resonator length L and an intra-cavity dispersion and configured for supporting light field resonator modes, and generating a pulse train of laser pulses (1) by a mode-locking mechanism. Laser pulses (1) are generated with a repetition frequency and provide a frequency comb with carrier frequency ωo and comb modes in frequency space. The intra-cavity dispersion is selected such that round trip phases ϕ have a dependency on frequency ω according to φ ( ω ) = π m ( 1 + 4 ω - ω 0 m ω r - 1 ) + L c ω 0 wherein m is an integer providing effective repetition rate (mωr) in combination with mode spacing ωr at optical carrier frequency (ωo), and the mode-locking mechanism provides a coupling of the resonator modes whereby frequency difference (Δn=ωn+1−ωn) between neighboring mode frequencies (ωn, ωn+1) is a linear function of mode frequency number n. Furthermore, a spectroscopy method for investigating a sample, a laser pulse source apparatus and a spectroscopy apparatus are described.
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公开(公告)号：US10038297B2
公开(公告)日：2018-07-31
申请号：US15329459
申请日：2015-07-21
CPC分类号： H01S3/06791 , H01S3/0675 , H01S3/06754 , H01S3/08027 , H01S3/082 , H01S3/10092 , H01S3/106 , H01S3/1112 , H01S5/5018
摘要： This invention relates to the field of laser technology and more particularly to the ultra-short pulse generation methods and generators. One round trip of the ultra-short light pulse formation inside a generator optical loop comprises these steps: amplification of the light pulse, spectral broadening of the amplified light pulse due to the optical Kerr effect inside the optically transparent medium, selection of the predeterminated spectral components of the spectrally broadened light pulses by using the first spectrally-sensitive optical element, then again follows amplification of the selected light pulses, spectral broadening of the amplified light pulse due to the optical Kerr effect inside the optically transparent medium and selection of the predeterminated spectral components of the spectrally broadened light pulses by using the second spectrally-sensitive optical element, where spectral components of the light pulses selected using the first spectrally-sensitive optical element are different than the spectral components of the light pulses selected using the second spectrally-sensitive optical element.
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公开(公告)号：US20180212394A1
公开(公告)日：2018-07-26
申请号：US15746274
申请日：2016-07-19
发明人： Mohamed Amine Jebali , Ryo Hasehawa
CPC分类号： H01S3/1305 , B23K26/032 , B23K26/0626 , G02B27/108 , H01S3/0071 , H01S3/11 , H01S3/1306 , H01S3/134 , H01S3/2232
摘要： A laser feedback control system includes a laser operable to emit a laser beam. The control system further includes a prism mirror which includes a first reflective surface. The first reflective surface is oriented to reflect the laser beam at a first angle to a first direction of travel of the laser beam. The control system further includes a sampling mirror, the sampling mirror partially reflective and oriented such that the laser beam reflected at the first angle by the first reflective surface encounters the sampling mirror at a polarization insensitive angle of incidence. The control system further includes a detector positioned to detect a portion of the laser beam transmitted through the sampling mirror.
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94.发明申请公开(公告)号：US20180191125A1
公开(公告)日：2018-07-05
申请号：US15738310
申请日：2016-06-30
发明人： Daniil MYASNIKOV , llya BYCHKOV
CPC分类号： H01S3/1109 , H01S3/06791 , H01S3/10061 , H01S3/1112 , H01S3/1305 , H01S3/136 , H01S3/137
摘要： The disclosed method and apparatus for stabilizing a mode-locked regime of a fiber ring oscillator based on a NPR include tapping a portion of light, which has a broad spectral bandwidth, from a fiber ring resonator into at least first and second control channels. The control channels are configured to guide respective first and second fractions of the tapped portion. One of the control channels is provided with a bandpass filter operative to extract a region from the broad spectral bandwidth. The fractions with respective full spectral bandwidth and region thereof are then evaluated in a central processing unit which is operable to generate a control signal if a predetermined criterion is not met. The control signal is received by one or more polarization controller units operative to dynamically modulate a state of polarization of light in the fiber ring resonator until the evaluation meets the predetermined criterion.
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公开(公告)号：US20180175582A1
公开(公告)日：2018-06-21
申请号：US15844469
申请日：2017-12-15
发明人： Jonathan M. Rothberg , Jason W. Sickler , Lawrence C. West , Faisal R. Ahmad , Paul E. Glenn , Jack Jewell , John Glenn , Jose Camara , Jeremy Christopher Jordan , Todd Rearick , Farshid Ghasemi , Jonathan C. Schultz , Keith G. Fife , Benjamin Cipriany
CPC分类号： H01S3/1115 , G02F1/37 , H01S3/0092 , H01S3/042 , H01S3/08072 , H01S3/0941 , H01S3/10046 , H01S3/1611 , H01S3/1673
摘要： Apparatus and methods for producing ultrashort optical pulses are described. A high-power, solid-state, passively mode-locked laser can be manufactured in a compact module that can be incorporated into a portable instrument. The mode-locked laser can produce sub-50-ps optical pulses at a repetition rates between 200 MHz and 50 MHz, rates suitable for massively parallel data-acquisition. The optical pulses can be used to generate a reference clock signal for synchronizing data-acquisition and signal-processing electronics of the portable instrument.
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96.发明申请公开(公告)号：US20180159297A1
公开(公告)日：2018-06-07
申请号：US15372277
申请日：2016-12-07
申请人： Cymer, LLC
发明人： Rahul Ahlawat , Thomas P. Duffey
CPC分类号： H01S3/106 , G03F7/2006 , H01S3/08004 , H01S3/08009 , H01S3/10069 , H01S3/137
摘要： Wafer positioning errors in stepper-scanners contribute to imaging defects. Changing the wavelength of the light source's generated light can compensate for wafer positional errors in the Z-direction. The wafer's real-time z-position is determined and a change in wavelength target to offset this error is communicated to the light source. The light source uses this change in wavelength target in a feed-forward operation and, in an embodiment, in combination with existing feedback operations, on a pulse-by-pulse basis for subsequent pulses in a current burst of pulses in addition to receiving the newly-specified laser wavelength target for a subsequent burst of laser pulses.
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97.发明申请公开(公告)号：US20180123313A1
公开(公告)日：2018-05-03
申请号：US15494678
申请日：2017-04-24
摘要： A passively Q-switched fiber laser system comprises a pump source and an ring cavity connected with each other. The ring cavity comprises a gain fiber, a directional coupler and a saturable absorber connected in order. The saturable absorber is a quantum-dot polymer composite film, which is fabricated by a simple method comprising steps of: mixing a quantum dot material of lead sulfide (PbS) with a colloidal polymer to form a mixture; and drying the mixture at two different temperatures in two stages respectively. The saturable absorber of the present invention has lower saturating intensity and a plurality of absorption bands comprising 1000 nm to 1100 nm and 1500 nm to 1600 nm. The maximum output power and the maximum pulse energy of the passively Q-switched fiber laser system can be superior to those laser systems using the quantum-dot (QD) polymer composite film as saturable absorber.
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公开(公告)号：US20180123312A1
公开(公告)日：2018-05-03
申请号：US15857894
申请日：2017-12-29
申请人： Gigaphoton Inc.
CPC分类号： H01S3/11 , H01S3/0078 , H01S3/08004 , H01S3/08009 , H01S3/134 , H01S3/137 , H01S3/1398 , H01S3/225 , H01S2301/04
摘要： The line narrowed laser apparatus configured to perform a plurality of burst oscillations including a first burst oscillation and a second burst oscillation next to the first burst oscillation to output a pulse laser beam. The line narrowed laser apparatus comprises a laser resonator, a chamber provided in the laser resonator, a pair of electrodes provided in the chamber, an electric power source configured to apply pulsed voltage to the pair of electrodes, a wavelength selecting element provided in the laser resonator, a spectral width varying unit provided in the laser resonator, and a controller. The controller is configured to measure a duty in a predetermined period before starting the second burst oscillation and a length of a suspension period from a time of ending the first burst oscillation to a time of starting the second burst oscillation, and perform a first control of the spectral width varying unit based on the duty and the length of the suspension period.
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公开(公告)号：US20180113372A1
公开(公告)日：2018-04-26
申请号：US15565626
申请日：2016-09-30
CPC分类号： G02F1/37 , G02F1/3551 , G02F1/39 , G02F2001/3528 , H01S3/0092 , H01S3/094076 , H01S3/10007 , H01S3/1095 , H01S3/11 , H01S3/1608 , H01S3/1623 , H01S3/1628 , H01S3/1643 , H01S3/2308
摘要： Systems and methods for spectrally broadening seed pulses with a single pass laser amplifier are disclosed. A bulk TM:II-VI polycrystalline material with combined gain and nonlinear characteristic provides passive (cold) spectral broadening of high power seed pulses. Continuous pumping provides more significant spectral broadening. In particular, pulsed pumping of TM:II-VI polycrystalline material (e.g. Cr2+:ZnS, Cr2+:ZnSe, and Cr2+:CdSe) is shown to provide significant spectral broadening to the super continuum generation SCG level. Pulse picking, pump sources, master oscillators and various optical components are described.
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公开(公告)号：US09941657B2
公开(公告)日：2018-04-10
申请号：US15304905
申请日：2015-04-20
CPC分类号： H01S3/1115 , H01S3/0816 , H01S3/0817 , H01S3/1118 , H01S5/02415 , H01S5/02423 , H01S5/02484 , H01S5/041 , H01S5/14 , H01S5/18383 , H01S5/34313 , H01S2304/04
摘要： A passively mode-locking laser and corresponding method is described. The laser comprises a resonator (2) terminated by first (3) and second (4) mirrors and folded by a third (5) and fourth (6) mirror. The third mirror comprises a reflector (14) surmounted by a multilayer semiconductor gain medium (15) including at least one quantum well layer while the second mirror (4) comprises an intensity saturable mirror. The resonator is configured to provide a cross sectional area of an intra cavity resonating field on the intensity saturable mirror that is greater than or equal to a cross sectional area of the intra cavity resonating field on the multilayer semiconductor gain medium. This arrangement provides a passively mode-locking laser that exhibits increased stability when compared to those systems known in the art.
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