WO2012167310A1 - Système optique et procédé de multiplication du taux de répétition des impulsions d'une source de laser - Google Patents

Système optique et procédé de multiplication du taux de répétition des impulsions d'une source de laser Download PDF

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Publication number
WO2012167310A1
WO2012167310A1 PCT/AU2012/000648 AU2012000648W WO2012167310A1 WO 2012167310 A1 WO2012167310 A1 WO 2012167310A1 AU 2012000648 W AU2012000648 W AU 2012000648W WO 2012167310 A1 WO2012167310 A1 WO 2012167310A1
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WO
WIPO (PCT)
Prior art keywords
optical
resonator
pulses
repetition rate
optical system
Prior art date
Application number
PCT/AU2012/000648
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English (en)
Inventor
David Francis KIELPINSKI
Omri Gat
Original Assignee
Griffith University
Yissum Research Development Company Of The Hebrew University Of Jerusalem Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AU2011902243A external-priority patent/AU2011902243A0/en
Application filed by Griffith University, Yissum Research Development Company Of The Hebrew University Of Jerusalem Ltd. filed Critical Griffith University
Publication of WO2012167310A1 publication Critical patent/WO2012167310A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10084—Frequency control by seeding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1106—Mode locking
    • H01S3/1112—Passive mode locking
    • H01S3/1115—Passive mode locking using intracavity saturable absorbers
    • H01S3/1118—Semiconductor saturable absorbers, e.g. semiconductor saturable absorber mirrors [SESAMs]; Solid-state saturable absorbers, e.g. carbon nanotube [CNT] based
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S2301/00—Functional characteristics
    • H01S2301/02—ASE (amplified spontaneous emission), noise; Reduction thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1106—Mode locking
    • H01S3/1121—Harmonically mode locking lasers, e.g. modulation frequency equals multiple integers or a fraction of the resonator roundtrip time
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/139—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length

Definitions

  • the disclosure herein generally relates to an optical system, and particularly but not exclusively to an optical system that produces optical pulses.
  • Ultrafast optical pulses are useful for many applications.
  • Example applications include but are not limited to metrology, communications, optical frequency counting and synthesis, broadband spectroscopy, and LIDA .
  • sources of ultrafast pulses may need to exhibit at least one of low optical phase noise, stable repetition rate, application specific pulse duration, low pulse-to-pulse parameter variations, be insensitive to environmental fluctuations, and be low cost. Some combinations of these qualities may be very difficult to achieve simultaneously. Summary
  • the optical system comprises an optical source arranged to generate optical pulses.
  • the optical system comprises an optical resonator having an optical input arranged for receiving the optical pulses, and also having an optical output.
  • the optical resonator has a component arranged to cause loss to a light within the resonator when in use, the loss decreasing as a power of the light increases.
  • the optical5 resonator has an optical gain medium arranged to cause gain to the light within the optical resonator when in use .
  • An embodiment of the system may be described as having an optical resonator having active components.
  • the resonator may be described as a filter that filters the optical output of the optical source.
  • the optical pulses emitted by the optical resonator may have more desirable properties than optical pulses emitted by the optical •source.
  • at least one of the optical resonator and the optical source are arranged to give a ratio of free spectral range of the optical resonator and repetition rate of the optical pulses a value which is a predefined rational number.
  • the repetition rate may not be an integer multiple of the free spectral range of the optical resonator.
  • the optical system may be arranged such that gain competition between frequency components of the pulses within the optical gain medium compensates for a deviation of the ratio from the predefined rational number.
  • the system is arranged to set each of at least two transmission frequencies of the optical resonator to a respective frequency component of the pulses.
  • the optical system may be arranged such that in use gain competition between a plurality of frequency components of the pulses within the gain medium
  • An embodiment is arranged to produce a plurality of emitted optical pulses at the output having a repetition frequency that is a least common multiple of a free spectral ran'ge of the optical resonator and a repetition rate of the optical pulses.
  • the optical system comprises a controller arranged to control a frequency relationship between the optical pulses and the optical resonator.
  • the optical system may comprise a resonator length stabiliser arranged to stabilise the length of the optical resonator.
  • the optical system may comprise a frequency modulator arranged to modulate at least one of the frequency of the . pulses from the optical source and the light within the optical resonator.
  • the optical source comprises a mode locked laser.
  • the mode locked laser may comprise a passively mode locked laser.
  • the component arranged to cause loss may comprise a mode locking element.
  • the mode locking element may comprise a saturable absorber.
  • the saturable absorber may comprise a semiconductor saturable absorber.
  • the saturable absorber may comprise graphene based materials.
  • At least one of the optical source and the resonator comprises optical fibre.
  • a method for configuring an optical system having an optical resonator arranged to receive optical pulses from an optical source comprises the step of defining a value that a ratio of a free spectral range of the optical resonator and a repetition rate of the optical pulses should be, the value being a rational number.
  • the method comprises the step of arranging the system to give the ratio the value.
  • the method further comprises arranging the system to ' emit optical pulses having a repetition frequency that is a least common multiple of a free spectral range of the resonator and the repetition rate of the optical pulses .
  • the method comprises arranging the system such that the repetition rate is not an integer multiple of the free spectral range of the resonator.
  • An optical system of the second aspect of the invention may be in accordance with an optical system of the first aspect of the invention.
  • the optical system comprises an optical source arranged to generate optical pulses.
  • the optical resonator has an optical input arranged for receiving the optical pulses, and also has an optical output. At least one of the optical resonator and the optical source are arranged to give a ratio of free spectral range of the resonator and
  • repetition rate of the optical pulses a value that is a predefined rational number.
  • the optical source is arranged to generate optical pulses.
  • the optical system comprises an optical resonator having an optical input arranged for receiving the optical pulses, and also has an optical output. At least one of the optical source and the optical resonator are arranged such that the repetition rate of the optical pulses is not an integer multiple of the free spectral range of the optical resonator.
  • the optical system comprises an optical source arranged to generate optical pulses. At least one of the optical source and the optical resonator are each arranged such that in use at least two transmission frequencies of the optical resonator are each in accordance with a respective frequency component of thp pulses.
  • the optical system comprises an optical source arranged to generate optical pulses.
  • the optical system comprises an optical resonator having an optical input arranged ' for- receiving the optical pulses, and also having an optical output. At least one of the optical source and the optical resonator are arranged to give optical pulses at the output a repetition frequency that is a least common multiple of a free spectral range of the resonator and the repetition rate of the optical pulses.
  • a method for generating optical output comprising the step of launching optical pulses into an optical resonator.
  • the method comprises the step of causing loss to a light within the optical resonator, the loss decreasing as the power of the light increases.
  • the method comprises the step of causing gain to the light within the optical resonator.
  • the method comprises the steps of: defining a value that a free spectral range of the resonator divided by a repetition rate of the optical pulses should be, the value being a rational number; and causing a ratio of the free spectral range and the repetition rate to be equal to the value.
  • Figure 1 shows a schematic representation of an embodiment of an optical system
  • Figure 2 is an optical spectrum from the output of the optical system of Figure 1;
  • Figure 3 shows the result of a measurement of the repetition rate by spectrum analysis of an output
  • Figure 4 shows a measurement of the optical frequency noise added by a resonator of the system of Figure 1;
  • Figure 5 shows a measurement of the repetition rate frequency noise of the system of Figure 1. ⁇ Detailed Description of embodiments
  • FIG. 1 shows a schematic representation of an embodiment of an optical system generally indicated by the numeral 10.
  • the system 10 has an optical source 12 arranged to generate optical pulses.
  • the optical source 12 may be any suitable optical source such as an electro- optic pulse generator, a passively mode locked laser, an actively mode locked laser, or a source using soliton generation in an optical fibre or waveguide.
  • the optical source comprises a passively mode locked erbium-doped fibre laser manufactured by Precision Photonics, and an erbium doped fibre amplifier.
  • the optical output of the passively mode locked erbium-doped fibre laser is amplified to an average power of between 10-20mW by the erbium doped fibre amplifier. It will be appreciated that the average power in other embodiments may be either above or below this range according to system configuration.
  • the pulses leaving the output optical fibre 14 of the optical source 12 then enter an optical circulator 16, with ports 18, 20, and 24 coupled to the laser 12.
  • the optical circulator 16 is arranged such that light that enters the port 18 leaves port 20, and light that enters port 20 leaves port 22 which is in communication with optical fibre 24.
  • any suitable commercially available circulator may be used.
  • Port 20 of the circulator 16 is coupled to the end of a fibre 26 which is connected to an optical resonator generally indicated by the rectangle 30 in dashing.
  • the resonator 30 may be described as acting as a filter of the optical pulses.
  • optical pulses emitted by the optical resonator 30 may have more desirable properties than optical pulses emitted by the optical source.
  • optical pulses emitted by the resonator may have at least one of lower optical phase noise, lower pulse-to-pulse parameter variations, be relatively insensitive to environmental fluctuations, and have a more stable repetition rate.
  • the pulse duration may be altered to suit a particular application.
  • the embodiment of figure 1 may have a lower cost than another pulse source, such as a mode locked laser, with similar optical pulse characteristics.
  • Light resonates within the resonator.
  • the light reflects off a reflector in the form of gold mirror 32.
  • the light passes through a collimator in the form of a collimating lens 34 mounted on a screw driven translation stages. Any suitable collimator may be used, for example a compound collimating lens.
  • the light passes through optical fibre 38, optical fused fibre coupler 28, optical fibre 40, an optical amplifier in the form of an erbium doped fibre amplifier 42 that in use provides optical gain, fibre 44, optionally another collimator in the form of a collimating lens 46 mounted on another translation stage 48, and a mode locking element, specifically a saturable absorber in the form of a semiconducting saturable absorbing mirror 50.
  • the mode locking element causes loss to light within the resonator when in use, the loss decreasing as the power of the light increases.
  • the fibre 44 may alternatively be butted against the
  • the erbium doped fibre amplifier 42 has 20 cm of LIEKKI ErllO-4/125 fibre, pumped through a 980/1550 nm wavelength-division .
  • multiplexer by a 400 mW laser diode operating at 976 nm.
  • the various parameters of the amplifier may be widely varied in accordance with the configuration of each respective embodiment. For example, a longer or shorter length of erbium doped optical fibre may be used.
  • the free-space distance between the gold mirror 32 and the end of the optical fibre 38 is 3 to 10 cm, although lower or higher values may be used in other embodiments.
  • the resonator of this embodiment has .an optical length of around 200 cm, although it will be appreciated that other values greater or less than this may result in a readily useable resonator.
  • the coupler 28 in this but not in all embodiments, is a four-port coupler having an 80/20 split between coupled ports, but ' any suitable coupler may be used, such as one with a 90/10 split.
  • the coupler may be a planar waveguide coupler, or a fibre waveguide coupler, for example. Generally any suitable coupler may be used.
  • the collimator may be a lOx microscope objective or any other suitable single or compound lens, Fresnel zone plate or lens, as appropriate.
  • the translation stages may be.
  • piezoelectric or otherwise motorised translation units are used instead of stages.
  • the gold, mirror may be replaced with a dielectric mirror.
  • any suitable reflecting structure of sufficient frequency bandwidth may be used.
  • the saturable absorber may be replaced with any component that causes loss to a light within the resonator when in use, the loss
  • a dye based saturable absorber or graphene based saturable absorber may reshape and shorten pulses circulating in the resonator, and may increase robustness against pulse parameter mismatch between the optical source and the resonator.
  • the absorber is, at least in this embodiment, passive and thus not affected by
  • a system such as that shown in Figure 1 may support 500 fs pulses with a bandwidth of around 5 nm within the telecommunications C-band, for example.
  • Port 18 acts as an optical input for the resonator and port 22 as an optical output for the resonator. Any suitable means of coupling light into and out of the resonator may be employed, however, such as partially reflective mirrors and/or frustrated total internal reflection.
  • the optical pulses received by port 20 are guided by fibre 26 into a coupler 28.
  • the pulses from the optical source may be chirped (an increasing or decreasing - generally but not necessarily quadratically - phase modulation along the pulse) to match the resonator.
  • the amount of chirp required may be determined by trial and error, by, for example,
  • the chirp may be selected by maximising the period of ripples in the optical spectrum of the output .
  • the length of the cavity may be adjusted and/or the repetition rate of the pulses from the optical source may be adjusted so that the free spectral range of the resonator divided by the repetition rate of the optical pulses from the optical source gives a value that concords with a rational number, or one of a set of rational numbers.
  • This concordance may be described as the vernier condition, and represented mathematically as
  • V p _P V p _P .
  • V F is the free spectral range of the resonator
  • v L is the repetition frequency of the optical pulses
  • p and q are each an integer. It may be desirable to achieve a ratio as close as possible to the above condition, although it practice it may be difficult to obtain it exactly.
  • p and q may each have a value between 1 and 100, although any suitable values may be used.
  • a rational number may be determined according to a desired output of the system before its operation., The system may then be arranged such that the vernier condition is sufficiently satisfied for the predetermined rational number.
  • the rational number may be - and generally is - determined in accordance with a desired operation of system prior to its operation.
  • the numbers p and q may be chosen such that p/q is an integer.
  • the ratio — may deviate from the selected rational
  • the optical system may however exhibit gain competition between frequency components of the pulses in the resonator to ameliorate such a deviation. This may result in observed low added phase noise and high
  • the frequency components of the optical pulses may bi regularly spaced apart in frequency, forming a so-called frequency comb.
  • the resonator may also have transmission frequencies that are regularly spaced apart.
  • the optical system may be arranged such that at least two transmission
  • V F0 is the lowest theoretical transmission frequency of the resonator and V L0 is one of the frequency components of the optical pulses. It may be desirable to achieve a value as close as possible to the above condition, although in practice it may be difficult to obtain it exactly.
  • the system may deviate f om the comb alignment conditio .
  • the optical system may, however, exhibit gain competition between frequency components of the pulses that ameliorate a discord between each of the at least two transmission frequencies of the resonator and their .
  • optical pulses may be emitted from the output having a repetition frequency that concords with a least common multiple of a free spectral range of the resonator and the repetition rate of the optical pulses.
  • the repetition rate is . not an integer multiple of the free spectral range of the resonator.
  • the optical system 10 may include a controller arranged to control a frequency relationship between the optical pulses and the resonator, such as those defined by the vernier condition and the comb alignment condition.
  • the controller may take the form of an active resonator length stabiliser arranged to stabilise the length of the resonator, having for example a piezoelectric driver.
  • the controller may alternatively or additionally comprise a frequency modulator arranged to modulate the frequency of the pulses from the optical source (or within the
  • FIG. 1 is an optical power spectrum from the output of the optical system of Figure 1.
  • the -3 dB bandwidth is approximately A nm.
  • a second order autocorrelation trace was also obtained to verify that short pulses were actually formed.
  • a distinct autocorrelation peak of approx. 1 ps width was obtained, corresponding to approx. 700 fs pulse duration.
  • Figure 3 shows the power spectrum of a signal from a photodiode that detects the optical output of the
  • the output repetition rate lies near 442 MHz.
  • the small other peaks arise from the slight variation of pulse energy at a frequency equal to the free spectral range of the active filter. This so-called supermode noise is suppressed by 33 dB, indicating that the pulse-to-pulse energy is constant at the level of a few parts in 10 4 .
  • Figure 4 is the result of a measurement of a signal from the photodiode showing the optical frequency noise- added by ⁇ the filter. This was obtained by optical
  • Figure 5 shows a measurement of the repetition rate frequency noise near 442 MHz by spectrum analysis of an output photodiode signal.
  • the -3 dB width of the signal is consistent with the 1 kHz resolution limit of the spectrum analyser.
  • the additional repetition rate noise is less than approximately 1 kHz.
  • the optical system may be operated detuned from the vernier condition by a small amount (of the order of a few parts per thousand) .
  • the output of the resonator then may consist of a frequency comb, in one realised case having a repetition rate of 440 MHz.
  • the stability was similar to that in a regime where both conditions are met, but the stability of the optical phase was not determined.
  • the pulse-to-pulse variation as measured in the beatnote spectrum, was limited to a few parts in 10 "5 .
  • the optical source and resonator are respective branches of a two-branch laser resonator, with the branches satisfying at least one of the vernier condition and the comb alignment condition.
  • Each branch plays a role both as a source in its own right and as a filter for the other branch, even if the two branches share a single gain medium and a single passive saturable absorber.
  • Some embodiments of the system have applications in at least one of metrology, communications, optical frequency counting and synthesis, broadband spec roscopy, and LIDAR.
  • the pulse duration may be modified according to the applica ion
  • the system may be insensitive to environmental fluctuations;
  • the component arranged to cause loss to a light within the - resonator may be any suitable component that exhibits a loss that decreases as the power of the light increases, such as a a graphene based material or a dye based saturable absorber, and is not limited to a semiconductor saturable absorber as used in the above described embodiments.
  • Other embodiments may have loss components that use additive pulse or nonlinear polarization-rotation effects.
  • the described embodiments employ optical fibre and optical fibre amplifiers arranged for wavelengths in the telecommunications C-band frequencies. Other embodiments may use other bands. Some embodiments may use Ti: Sapphire wavelengths or any other suitable wavelengths, for example. Other embodiments may not be fibre based, but rather predominantly use bulk optics, semiconductor or other waveguides, for example. Generally any suitable optical components may be used.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Nanotechnology (AREA)
  • Lasers (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

La présente invention concerne un système optique et un procédé destinés à améliorer la multiplication du taux de répétition des impulsions d'une source de laser pulsé au moyen d'un résonateur maître-esclave, le taux de répétition esclave étant réglé sur un harmonique rationnel du taux de répétition maître. Le système optique comprend une source optique (maître) conçue pour produire des impulsions optiques, un résonateur optique (esclave) présentant une entrée optique conçue pour recevoir les impulsions optiques, et présentant également une sortie optique. Le résonateur optique contient également un absorbeur saturable et un milieu à gain. Le système peut comprendre en outre un élément de modulation de fréquence active.
PCT/AU2012/000648 2011-06-07 2012-06-07 Système optique et procédé de multiplication du taux de répétition des impulsions d'une source de laser WO2012167310A1 (fr)

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Application Number Priority Date Filing Date Title
AU2011902243 2011-06-07
AU2011902245 2011-06-07
AU2011902243A AU2011902243A0 (en) 2011-06-07 Optical system
AU2011902245A AU2011902245A0 (en) 2011-06-07 Optical system

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US9525265B2 (en) 2014-06-20 2016-12-20 Kla-Tencor Corporation Laser repetition rate multiplier and flat-top beam profile generators using mirrors and/or prisms

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Publication number Priority date Publication date Assignee Title
US5265109A (en) * 1992-10-23 1993-11-23 At&T Bell Laboratories Ultrashort optical pulse signals generation
EP2169785A1 (fr) * 2008-09-25 2010-03-31 OFS Fitel, LLC Fibre laser à blocage de mode passif avec de nanotubes de carbone
US20110158265A1 (en) * 2009-12-30 2011-06-30 Industrial Technology Research Institute Ring or linear cavity of all-fiber-based ultra short pulse laser system and method of operating the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5265109A (en) * 1992-10-23 1993-11-23 At&T Bell Laboratories Ultrashort optical pulse signals generation
EP2169785A1 (fr) * 2008-09-25 2010-03-31 OFS Fitel, LLC Fibre laser à blocage de mode passif avec de nanotubes de carbone
US20110158265A1 (en) * 2009-12-30 2011-06-30 Industrial Technology Research Institute Ring or linear cavity of all-fiber-based ultra short pulse laser system and method of operating the same

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Title
LE NGUYEN BINH: "Photonic Signal Processing: Techniques and Applications", CRC PRESS, TAYLOR & FRANCIS GROUP, 2008, pages 193 - 194 *
NIKODEM, M. P. ET AL.: "Actively mode-locked fiber laser using acousto-optic modulator", PROC. OF SPIE, vol. 7141, 2008 *
SIZER, T.: "Increase in Laser Repetition Rate by Spectral Selection", IEEE JOURNAL OF QUANTUM ELECTRONICS, vol. 25, no. 1., 1989, pages 97 - 103 *
SMID, R. ET AL.: "Methods of Conversion of Stability of Femtosecond Stablized Mode- locked Laser to Optical Resonator", IEEE CONFERENCE PAPER (FREQUENCY CONTROL SYMPOSIUM JOINT WITH THE 22ND EUROPEAN FREQUENCY AND TIME FORUM), 2009, pages 742 - 746 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9525265B2 (en) 2014-06-20 2016-12-20 Kla-Tencor Corporation Laser repetition rate multiplier and flat-top beam profile generators using mirrors and/or prisms
US10044164B2 (en) 2014-06-20 2018-08-07 Kla-Tencor Corporation Laser repetition rate multiplier and flat-top beam profile generators using mirrors and/or prisms

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