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    HIGH POWER SHORT PULSE FIBER LASER
    12.
    发明申请
    HIGH POWER SHORT PULSE FIBER LASER 有权

    公开(公告)号：US20150085885A1

    公开(公告)日：2015-03-26

    申请号：US14012508

    申请日：2013-08-28

    Applicant: IMRA America, Inc.

    Inventor： Xinhua Gu ,  Mark Bendett ,  Gyu Cheon Cho ,  Martin E. Fermann

    IPC: H01S3/11 ,  H01S3/067

    CPC classification number: H01S3/1115 ,  H01S3/0057 ,  H01S3/0064 ,  H01S3/0078 ,  H01S3/06712 ,  H01S3/06741 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/094042 ,  H01S3/0941 ,  H01S3/1028 ,  H01S3/1305 ,  H01S3/1618 ,  H01S3/1698

    Abstract: A pulsed laser comprises an oscillator and amplifier. An attenuator and/or pre-compressor may be disposed between the oscillator and amplifier to improve performance and possibly the quality of pulses output from the laser. Such pre-compression may be implemented with spectral filters and/or dispersive elements between the oscillator and amplifier. The pulsed laser may have a modular design comprising modular devices that may have Telcordia-graded quality and reliability. Fiber pigtails extending from the device modules can be spliced together to form laser system. In one embodiment, a laser system operating at approximately 1050 nm comprises an oscillator having a spectral bandwidth of approximately 19 nm. This oscillator signal can be manipulated to generate a pulse having a width below approximately 90 fs. A modelocked linear fiber laser cavity with enhanced pulse-width control includes concatenated sections of both polarization-maintaining and non-polarization-maintaining fibers. Apodized fiber Bragg gratings and integrated fiber polarizers are included in the cavity to assist in linearly polarizing the output of the cavity. Very short pulses with a large optical bandwidth are obtained by matching the dispersion value of the fiber Bragg grating to the inverse of the dispersion of the intra-cavity fiber.

    Compact coherent high brightness light source for the mid-IR and far IR
    13.
    发明授权
    Compact coherent high brightness light source for the mid-IR and far IR 有权
    紧凑型相干高亮度光源，适用于中红外和远红外

    公开(公告)号：US08861555B2

    公开(公告)日：2014-10-14

    申请号：US13682309

    申请日：2012-11-20

    Applicant: IMRA America, Inc.

    Inventor： Martin E. Fermann ,  Jens Bethge ,  Ingmar Hartl

    IPC: H01S3/30 ,  H01S3/00 ,  G02B6/02

    CPC classification number: H01S3/0092 ,  G02B6/02038 ,  G02F1/3534 ,  G02F1/365 ,  G02F2001/3528 ,  H01S3/067 ,  H01S3/06725 ,  H01S3/094046 ,  H01S3/109 ,  H01S3/1106 ,  H01S3/30 ,  H01S3/302

    Abstract: Compact laser systems are disclosed which include ultrafast laser sources in combination with nonlinear crystals or waveguides. In some implementations fiber based mid-IR sources producing very short pulses and/or mid-IR sources based on a mode locked fiber lasers are utilized. A difference frequency generator receives outputs from the ultrafast sources, and generates an output including a difference frequency. The output power from the difference frequency generator can further be enhanced via the implementation of large core dispersion shifted fibers. Exemplary applications of the compact, high brightness mid-IR light sources include medical applications, spectroscopy, ranging, sensing and metrology.

    Abstract translation: 公开了紧凑的激光系统，其包括与非线性晶体或波导组合的超快激光源。 在一些实现中，利用基于模式锁定光纤激光器产生非常短脉冲和/或中红外光源的基于光纤的中红外光源。 差频发生器接收来自超快源的输出，并产生包括差频的输出。 来自差分频率发生器的输出功率可以通过实施大型核心色散位移光纤进一步提高。 紧凑的高亮度中红外光源的示例性应用包括医疗应用，光谱学，测距，感测和计量学。

    ULTRASHORT LASER MICRO-TEXTURE PRINTING
    15.
    发明申请
    ULTRASHORT LASER MICRO-TEXTURE PRINTING 有权
    ULTRASHORT激光微纹理印刷

    公开(公告)号：US20140185065A1

    公开(公告)日：2014-07-03

    申请号：US14198434

    申请日：2014-03-05

    Applicant: IMRA America, inc.

    Inventor： Lawrence Shah ,  Martin E. Fermann

    IPC: G06K15/12 ,  H04N1/407 ,  B41J2/44 ,  H04N1/40

    CPC classification number: G06K15/1209 ,  B41J2/442 ,  B41J2/471 ,  G06K15/129 ,  H04N1/40037 ,  H04N1/407

    Abstract: Systems and methods for providing laser texturing of solid substrates are disclosed. The texturing may be used to provide grayscale images obtainable from substrates, which may include steel, aluminum, glass, and silicon. In some embodiments, images may be obtainable from the substrate by modifying the reflective, diffractive, and/or absorptive features of the substrate or the substrate surface by forming random, periodic, and/or semi-periodic micro-structure features on the substrate (or substrate surface) by an ultrafast laser pulse train. The ultrafast pulse train may be modulated in order to vary, for example, optical exposure time, pulse train intensity, laser polarization, laser wavelength, or a combination of the aforementioned. The ultrafast pulse train and the substrate may be scanned with respect to each other to provide different optical energies to different regions of the substrate (or substrate surface). In some embodiments, the image is provided by making one or more passes of the ultrafast laser pulse train relative to the substrate.

    Abstract translation: 公开了用于提供固体基底的激光纹理化的系统和方法。 纹理可以用于提供可从包括钢，铝，玻璃和硅的基底获得的灰度图像。 在一些实施例中，可以通过在衬底上形成随机，周期性和/或半周期微结构特征来修饰衬底或衬底表面的反射，衍射和/或吸收特征，从衬底获得图像（ 或基板表面）。 为了改变例如光学曝光时间，脉冲串强度，激光偏振，激光波长或上述的组合，可以调制超快脉冲串。 可以相对于彼此扫描超快速脉冲串和衬底，以向衬底（或衬底表面）的不同区域提供不同的光学能量。 在一些实施例中，通过相对于衬底进行超快激光脉冲串的一次或多次通过来提供图像。

    ULTRA-HIGH STABILITY BRILLOUIN LASER
    16.
    发明公开
    ULTRA-HIGH STABILITY BRILLOUIN LASER 审中-公开

    公开(公告)号：US20230318253A1

    公开(公告)日：2023-10-05

    申请号：US18177410

    申请日：2023-03-02

    Applicant: IMRA America, Inc.

    Inventor： Martin E. Fermann ,  Antoine Jean Gilbert Rolland ,  Peng Li

    IPC: H01S3/30 ,  H01S3/13 ,  H01S3/0941 ,  H01S3/094 ,  H01S3/10 ,  H01S3/00 ,  H01S3/08

    CPC classification number: H01S3/302 ,  H01S3/0085 ,  H01S3/08013 ,  H01S3/094076 ,  H01S3/0941 ,  H01S3/10092 ,  H01S3/1305

    Abstract: Example ultra narrow linewidth Brillouin lasers are disclosed that are pumped by pump lasers that are controlled via optimal control schemes in order to stabilize the Brillouin laser output frequency and minimize the Brillouin output linewidth. The control schemes are based on feedback loops to match the pump laser frequency to the optimum Stokes shift on the one hand and to line-narrow the pump laser linewidth on the other hand via comparing the linewidth of the pump laser with the linewidth of the Brillouin laser. The feedback loops in the control schemes can be partially or fully replaced with feedforward control schemes, allowing for larger bandwidth control. Provision for simultaneous oscillation of the Brillouin lasers on two polarization modes allows for further line-narrowing of the Brillouin output. The ultra-narrow linewidth Brillouin lasers can be advantageously implemented as pumps for microresonator based frequency combs, and can also be integrated to the chip scale and be constructed with minimal vibration sensitivity. The ultra-narrow linewidth Brillouin lasers can be widely tuned and a frequency readout can be provided via the use of a frequency comb. When phase locking a frequency comb to the Brillouin laser, ultra-stable microwave generation can be facilitated.

    COMPACT MICRORESONATOR FREQUENCY COMB
    17.
    发明申请
    COMPACT MICRORESONATOR FREQUENCY COMB 有权

    公开(公告)号：US20210294180A1

    公开(公告)日：2021-09-23

    申请号：US17225012

    申请日：2021-04-07

    Applicant: IMRA America, Inc.

    Inventor： Naoya Kuse ,  Martin E. Fermann ,  Tomohiro Tetsumoto ,  Antoine Jean Gilbert Rolland

    IPC: G02F1/35 ,  G01S7/481

    Abstract: Systems and methods for precision control of microresonator (MR) based frequency combs can implement optimized MR actuators or MR modulators to control long-term locking of carrier envelope offset frequency, repetition rate, or resonance offset frequency of the MR. MR modulators can also be used for amplitude noise control. MR parameters can be locked to external reference frequencies such as a continuous wave laser or a microwave reference. MR parameters can be selected to reduce cross talk between the MR parameters, facilitating long-term locking. The MR can be locked to an external two wavelength delayed self-heterodyne interferometer for low noise microwave generation. An MR-based frequency comb can be tuned by a substantial fraction or more of the free spectral range (FSR) via a feedback control system. Scanning MR frequency combs can be applied to dead-zone free spectroscopy, multi-wavelength LIDAR, high precision optical clocks, or low phase noise microwave sources.

    Utilization of time and spatial division multiplexing in high power ultrafast optical amplifiers
    18.
    发明授权
    Utilization of time and spatial division multiplexing in high power ultrafast optical amplifiers 有权

    公开(公告)号：US11121519B2

    公开(公告)日：2021-09-14

    申请号：US16218065

    申请日：2018-12-12

    Applicant: IMRA America, Inc.

    Inventor： Kevin F. Lee ,  Martin E. Fermann

    IPC: H01S3/067 ,  H01S3/00 ,  H01S3/23 ,  H01S3/10 ,  H01S3/13 ,  H01S3/094 ,  H01S3/08

    Abstract: In an example amplifier system, an input pulse train is passed through an optical stage that splits each pulse into two or more pulses. These divided pulses are then injected into at least two amplifiers for amplification. The amplified pulses are subsequently passed back through the same optical stage in order to combine the pulses back into one high energy pulse. The amplifier system can use time division multiplexing (TDM) and/or spatial division multiplexing (SDM) to produce, e.g., four pulses in conjunction with two amplifiers and propagation through two optical beam splitters, which are coherently combined into a single output pulse after amplification. The amplifiers can comprise fiber amplifiers or bulk amplifiers.

    All-fiber chirped pulse amplification systems
    19.
    发明授权
    All-fiber chirped pulse amplification systems 有权

    公开(公告)号：US10096962B2

    公开(公告)日：2018-10-09

    申请号：US14716369

    申请日：2015-05-19

    Applicant: IMRA AMERICA, INC.

    Inventor： Martin E. Fermann

    IPC: H01S3/00 ,  H01S3/13 ,  H01S3/067 ,  H01S3/23 ,  H01S3/16 ,  H01S3/094 ,  H01S3/108 ,  H01S3/30

    Abstract: By compensating polarization mode-dispersion as well chromatic dispersion in photonic crystal fiber pulse compressors, high pulse energies can be obtained from all-fiber chirped pulse amplification systems. By inducing third-order dispersion in fiber amplifiers via self-phase modulation, the third-order chromatic dispersion from bulk grating pulse compressors can be compensated and the pulse quality of hybrid fiber/bulk chirped pulse amplification systems can be improved. Finally, by amplifying positively chirped pulses in negative dispersion fiber amplifiers, a low noise wavelength tunable seed source via anti-Stokes frequency shifting can be obtained.

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