Menlo systems fiberbased femtosecond laser sources integrate the latest achievements in fiber technology into easytouse products. Femtosecond laser micromachining of microstructures for sensing and detection by yukun han a dissertation presented to the faculty of the graduate school of the. Bock thesis submitted to the faculty of graduate and postdoctoral studies in partial fulfillment of the requirements for the degree of master of applied science in biomedical engineering school of electrical engineering and computer science university of ottawa. In this thesis i present two approaches for semiconductor absorbers a reversebiased. Pdf the current status of ultrafast fiber lasers is discussed. Menlo systems redfiber is a frontend laser with a 2. Firstly, an environmentallystable and ultracompact sesam modelocked fiber laser is demonstrated.
The purpose of this study is to discuss applications and advantages of femtosecond lasers over traditional manual techniques, and related unique complications in. Femtosecond pulse generation from a topological insulator. An ultrashort pulse fiber laser has been proposed due to the problem of bulky. Designed for applications in multiphon imaging, nanoscience, biomedical instrumentation, terahertz radiation, and nonlinear optical studies. This wavelength is particularly important in biomedical applications, which includes but is not limited to confocal microscopy and ablation for surgical incisions. Fiber laser from laserfemto with femtosecond pulse output. Yag lasers for many stent and hypo tube laser micro cutting applications. With the simplicity and reliability of optical fiber, built to coherents exacting industrial manufacturing standards and delivering unmatched ultrafast performance, coherents newest fiber oscillator, the fidelity, is the most powerful and dependable femtosecond light source available. Designing for femtosecond pulses femtosecond fiber laser. We present a detailed description of the design, construction, and performance of highpower ultrafast yb. Wise department of applied physics cornell university tuesday, august 2, 2011.
Optical frequency combs generated by modelocked femtosecond fiber lasers are vital tools for ultraprecision frequency metrology and molecular spectroscopy. Starcut tube laser cutting machine highprecision laser tube cutting system production. Cornell university 2008 the applications of ultrafast optical pulses exploded in last two decade since the discovery of a modelocked ti. Femtosecond fiber laser direct writing of optical waveguide in glasses huan huang, lihmei yang and jian liu polaronyx, inc. Femtosecond pulse generation from a topological insulator modelocked fiber laser hao liu,1 xuwu zheng, 1 meng liu,1 nian zhao,1 aiping luo,1 zhichao luo,1, wencheng xu, 1, han zhang,2 chujun zhao,3 and shuangchun wen3 1laboratory of nanophotonic functional materials and devices, school of information and. Highenergy ultrafast ytterbium fiber lasers joel buckley, ph. Principle, operation, and applications kluwer academic publishers springer norwell, ma jun ye and steven t. First, a 3ghz fundamentally modelocked ybfiber laser is demonstrated with the highest reprate among all femtosecond ybfiber lasers to date. The pulse duration of fiber lasers ranges from 50 femtosecond to 500 femtosecond with an.
Thesis submitted to the faculty of graduate and postdoctoral studies. This family of industrial femtosecond lasers is ideal for ultrafine processing of materials with little or no heat affected zone haz. Femtosecond fiber laser technology from calmar laser. It is based on the wellestablished nonlinear optical l. Sinan kadri bilikmen september 2006, 73 pages this thesis presents a compact femtosecond laser amplifier design for optical preamplifiers and power amplifiers consist of theoretical perspective, simulations. Once the pulse is generated by the oscillator, it is amplified to much higher energies through chirped pulse amplification cpa. The andi fiber lasers are not only practical femtosecond lasers, but also great research tools for ultrashort pulse propagation phenomena.
Due to a nonreciprocal phase shift, the loop mirror can be operated in a compact and efficient reflection mode, offering the possibility to reach high repetition rates and easy implementation of tuning elements. Our history as the oldest and most experienced femtosecond fiber laser company reflects the successful implementation of breakthrough technologies. The continuous chirp was achieved by inscribing into a bent fiber using a phase mask scanning technique. Calmars seed lasers utilize a saturable absorber to deliver excellent stability and reliability, with turnkey operation. All polarizationmaintaining fiber laser architecture for. Ultrafast fiber lasers operating in the nearinfrared have revolutionized laser science by enabling numerous breakthroughs in both fundamental science and industrial applications. Ultimately, it was understood which conditions minimized the cavity noise and pulse widths thus allowing for the achievement of a 1550 nm, 1 ghz, sub 10 fs jitter, femtosecond fiber laser. Calmar laser manufactures innovative, fiber based, picosecond and femtosecond lasers for the needs of scientific research and the biomedical, semiconductor, solar, and telecommunications industries. This thesis reports our attempt towards achieving a phase stabilized freespace nonlinear polarization rotation npr mode locked erbium doped fiber laser frequency comb system. Femtosecond fiber lasers have become an important enabling technology for advances in many areas including.
This thesis is not limited to the demonstration of andi lasers. Frequency combs can be generated by a number of mechanisms, including periodic modulation in amplitude andor phase of a continuouswave laser, fourwave mixing in nonlinear media, or stabilization of the pulse train generated by a modelocked laser. Dissipative solitons of complex cubic quintic ginzburglandau equation are demonstrated experimentally from an allnormal dispersion. Femtosecond laser micromachining of microstructures for. The thesis titled nddoped fiber lasers and fiber amplifiers at 9xx nm prepared by jiawei song has been submitted in partial fulfillment of requirements for a masters degree at. Another type of passively modelocked lasers is the fiber laser. With average powers now approaching tens of watts the cutting speed of femtosecond laser cutting is becoming competitive to fiber and nd. Express 28, 23172325 2020 elina farm, soroush mehravar, khanh kieu, nasser peyghambarian, mikko ritala, markku leskela, and marianna kemell. Fabrication of microfluidic structures by laser ablation and automation of optical testing thesis by. An rf synchronization output is provided as a trigger signal. Allfiber passively modelocked femtosecond fiber lasers ryersons. Femtosecond fiber lasers and amplifiers based on the pulse propagation at normal dispersion chin yu chong, ph. This thesis is submitted to the faculty of science at the university of. A noburr edge on any metal including nitinol can have a significant cost saving on down stream processes such as post processing.
Advanced ultrafast fiber laser sources enabled by fiber nonlinearities. If a power dependent nonlinear element which has higher loss at lower optical power than the higher power is inserted into the laser cavit,y the laser may favor a superposition of longitudinal modes corresponding to a pulse. Design and verification of a multiterawatt tisapphire. Afs offers the highest performance among commercially available 2m fiberbased ultrafast laser systems. These lasers operate in the near infrared region, lasing at 1030 nm. Femtosecond lasers allow cold laser cutting of almost all metals and lowmelting biodegradable polymer. The repetition rate can be adjusted up to 10 mhz, depending on pulse energy. We then numerically and experimentally study the optimization of femtosecond ydfas in order to achieve both highquality and highpower compressed pulses in the 3 ghz high power fiber laser system. A laser in steady system is a feedback back system where the gain per round trip is balanced by the losses. A central emission wavelength of 2 m generated by thuliumdoped amplifiers has enabled a multitude of new applications.
Abstract there is a great deal of interests and efforts in the area of femtosecond fs laser direct writing of transparent materials. Femtosecond fiber lasers and amplifiers based on the pulse. Femtosecond laser features dynamic pulse shaping and control. They are extremely robust and offer perfect beam parameters and pointing stability. Femtosecond laser technology has become widely adopted by ophthalmic surgeons.
Bursttrain generation for femtosecond laser lamentation. Progress in cherenkov femtosecond fiber lasers iopscience. This thesis focuses on research i have done on ytterbiumdoped femtosecond fiber lasers. All polarizationmaintaining fiber laser architecture for robust femtosecond pulse generation 1 3 page 3 of 6 41 smaller while the loss from an asymmetric splitting, which might be raised for compensation, becomes increasingly severe. Femtosecond fiber lasers at 1550 nm for high repetition rates and low timing jitter. Here we present a novel configuration of a modelocked fiber laser with a reflective allpm sagnac loop that. We report on a novel architecture for robust modelocked femtosecond fiber lasers using a nonlinear optical loop mirror with all polarizationmaintaining fibers. The compact laser is based on menlo systems allpolarizationmaintaining, figure 9 modelocking technology. Construction and characterization of monolithic femtosecond fiber lasers. In optics, a frequency comb is a laser source whose spectrum consists of a series of discrete, equally spaced frequency lines.
Highenergy ybdoped femtosecond fiber lasers hussein kotb a thesis submitted to the faculty of graduate and postdoctoral studies in partial fulfillment of the requirements for th. Recent advances in optical fiber designs as well as improved saturable absorbers have. We report on what we believe to be the first successful inscription of continuously chirped fiber bragg gratings ccfbg into a nonphotosensitive singlemode fiber smf with nearir femtosecond laser pulses. Supercontinuum spectra are measured for these fibers, with a spectral width covering 11002600 nm wavelengths under pumping with a robust fixedwavelength erbium fiber based femtosecond laser. Construction and characterization of monolithic femtosecond fiber lasers liu, xiaomin publication date. We report on the development of a ultrafast fiber lasermicroscope system for femtosecond photodisruption of biological targets. Osa femtosecond fiber lasers reach the midinfrared. The allfiber design is realized using a modefieldadaptor mfa to couple light onto the sesam. Femtosecond fiber lasers at 1550 nm for high repetition rates and. Both are constructed using lowcost, commercially available components, and can be. Here, we explore the direct fabrication of embedded devices in pdms by nanosecond laser. Allfiber highpower 1700 nm femtosecond laser based on optical parametric chirpedpulse amplification.
In this thesis, i present a linearly ampli ed ber laser with 55 w average output power and 150 fs pulse duration. Design and analysis of ultrashort femtosecond laser amplifiers dogan, ersin m. Threedimensional 3d patterning inside optical fiber was shown to be a powerful tool for embedding refractive index and microfluidic structures inside the flexible glass fiber for enabling novel sensing opportunities with labinfibers lifs. Femtosecond fiber laser system manufacturered by calmar laser. Advanced ultrafast fiber laser sources enabled by fiber. View femtosecond laser micromachining research papers on academia. Seed laser low power the seed laser is an essential requirement for any femtosecond laser system, as its the source of the femtosecond pulses. A femtosecond laser was tightly focused into optical fibers using an oilimmersion lens to eliminate extreme optical aberrations. Femtosecond fiber lasers based on dissipative processes f. Ultrafast fiber lasers using novel semiconductor saturable. This dissertation is submitted to the university of hamburg for the degree of. Fiber laser system has long life time estimated to be greater then 100,000 hour and requires minimal maintenance. This thesis summarizes the effort of the ybdoped fiber laser performance enhancement utilizing the pulse propagation at high normal dispersion. This laser modelocked in several different states and a study to characterize and understand these states was undertaken.
Femtosecond fiber lasers based on dissipative processes. Afs ultrafast fiber lasers are characterized by an outstanding performance combined with flexibility and maximum stability. Can we make a femtosecond laser without soliton formation. Continuously chirped fiber bragg gratings by femtosecond. Femtosecond fiber lasers at 1550 nm for high repetition. Abstract there is a great deal of interests and efforts in the area of femtosecond fs. Yukun qin, orkhongua batjargal, benjamin cromey, and khanh kieu. To this end, an allfiber system based on a ybfiber femtosecond laser, producing electrically tunable femtosecond focr output in the vis spectral range with average power in the milliwatt range has been recently developed. Femtosecond fiber laser additive manufacturing of tungsten. A modelocked ybfiber laser oscillator generates fewnj pulses at 32.
To evaluate a new technique for penetrating keratoplasty pk with the use of a new software algorithm for a femtosecond laser that is designed to create penetrating cuts for pk in the treatment. In this letter, we extend the spectral coverage of these laser sources to the midinfrared by reporting the first femtosecond fiber laser operating near 3. Target materials for these femtosecond laser products include glass, oled, ic packageswafers, and flexible thin films. Intracavity dispersion compensation allows for spectral bandwidths supporti. Chemicalassisted femtosecond laser writing of labin. Bursttrain generator for femtosecond laser lamentationdriven micromachining saeid rezaei submitted for the degree of master of applied science january 2011 abstract bursts of femtosecond laser pulses with a repetition rate of 38. A fiber laser is explored which is capable of generating extremely short, high.
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