EP0674815A1 - Dispositif a laser multi-mode - Google Patents

Dispositif a laser multi-mode

Info

Publication number
EP0674815A1
EP0674815A1 EP94903848A EP94903848A EP0674815A1 EP 0674815 A1 EP0674815 A1 EP 0674815A1 EP 94903848 A EP94903848 A EP 94903848A EP 94903848 A EP94903848 A EP 94903848A EP 0674815 A1 EP0674815 A1 EP 0674815A1
Authority
EP
European Patent Office
Prior art keywords
optical
active
guide
active medium
wavelength
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP94903848A
Other languages
German (de)
English (en)
Inventor
Guido Chiaretti
Daniele Di Rocco
Paolo Laporta
Orazio Svelto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Italtel SpA
Original Assignee
Italtel SpA
Italtel Societa Italiana Telecomunicazioni SpA
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
Application filed by Italtel SpA, Italtel Societa Italiana Telecomunicazioni SpA filed Critical Italtel SpA
Publication of EP0674815A1 publication Critical patent/EP0674815A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/0627—Construction or shape of active medium the resonator being monolithic, e.g. microlaser
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4202—Packages, e.g. shape, construction, internal or external details for coupling an active element with fibres without intermediate optical elements, e.g. fibres with plane ends, fibres with shaped ends, bundles
    • G02B6/4203—Optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4206—Optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4207—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms with optical elements reducing the sensitivity to optical feedback
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/421—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical component consisting of a short length of fibre, e.g. fibre stub
    • 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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping
    • 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
    • H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
    • 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
    • H01S2302/00—Amplification / lasing wavelength
    • 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
    • H01S2303/00—Pumping wavelength
    • 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
    • H01S3/02—Constructional details
    • H01S3/025—Constructional details of solid state lasers, e.g. housings or mountings
    • 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
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/08018—Mode suppression
    • H01S3/08022—Longitudinal modes
    • H01S3/08031—Single-mode emission
    • H01S3/08036—Single-mode emission using intracavity dispersive, polarising or birefringent elements
    • 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
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1608—Solid materials characterised by an active (lasing) ion rare earth erbium
    • 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
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1618—Solid materials characterised by an active (lasing) ion rare earth ytterbium
    • 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
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/17—Solid materials amorphous, e.g. glass

Definitions

  • the present invention relates a multi-mode lase device for the use in telecommunication systems, and i particular it can be advantageously but not exclusivel used as a laser source suitable to emit a plurality o equi-distributed frequencies and substantially stable fo the optical fibre transmission.
  • a multi-mode lase device for the use in telecommunication systems, and i particular it can be advantageously but not exclusivel used as a laser source suitable to emit a plurality o equi-distributed frequencies and substantially stable fo the optical fibre transmission.
  • the object of the present invention is to eliminate o to reduce substantially the above mentioned deficiences, and in particular to generate the above-said plurality o different frequencies through a single laser device.
  • a multi-mode laser device for the emission of plurality of equi-distributed and substantially stabl frequencies for the transmission in optical fibre of the type comprising: - a pumping laser able to emit a radiation at a first wavelength ⁇ l; a resonating cavity having one end optically coupled to the pumping laser; an optical fibre rod optically coupled to the other end of the resonating cavity; characterized in that said resonating cavity is set up by: a portion of active material able to emit a radiation at a second wavelength ⁇ 2 pumped by said pumping laser; a first mirror highly transparent at the wavelength ⁇ l and highly reflecting at the wavelength ⁇ 2 set up on the surface of the active medium facing the pumping laser, and a second mirror highly reflecting the wavelength ⁇ set up on the other surface of the active medium facing th optical fibre rod; means suitable to vary the dimensions of sai resonating cavity.
  • figure 1 shows schematically a first embodiment of th present invention
  • figure 2 shows an emission diagram of the multi-mod laser device subject of the present invention
  • figure 3 shows a second embodiment of the invention
  • figure 4 shows a third embodiment of the presen invention
  • figure 5 illustrates a constructive drawing of th device according to the present invention realize according to said third embodiment (figure 4)
  • figure 6 shows a fourth embodiment of the present invention
  • figure 7 illustrates a constructive drawing of th device according to the present invention realized i accordance with said fourth embodiment (figure 6)
  • figures 8 to 10 illustrate schematically as man further embodiments of the present invention.
  • the device according to th invention includes a first semiconductor laser 1 (pumpin laser) which in accordance with a preferred embodimen emits radiations at a wavelength ⁇ l between 940 and 980 nm, and it is optically coupled to a resonating cavity 2 consisting of a monolithic lengthened structure havin preferably a circular cross section.
  • the resonating cavity includes:
  • the filter 4 as well as the filter 5 are obtained in known way by putting down an oxide or metal layer on th curved surface - with the concavity facing the active medium - of said portion of active material 3.
  • This concavity has the function of favouring the setting up of the fundamental propagation mode of the radiation at 1535 nm.
  • On the second side of the filter 5 which is slightly transparent at the wavelength ⁇ 2 emitted by the active medium an optical fibre rod 6 is coupled.
  • the pumping laser diode 1 emits a beam of slightly diverging radiations at a wavelength ⁇ l which pass through the filter 4 and excite the portion of active material 3 emitting at its turn a radiation at the wavelength ⁇ 2 propagating inside the resonating cavity. Since the mirror 5, as specified before, is slightly transparent a portion of the radiation ⁇ 2 (about 1%) gets out of the resonating cavity 2 and constitutes a useful signal which, coupled to the optical fibre 6 is sent to an external modulation device not shown. According to the invention a tuning device 7 is foreseen, fed by a variable voltage indicated schematically by V, to vary axially the position of the mirrors 4 and 5 in order to modify the length of the resonating cavity.
  • V variable voltage indicated schematically by V
  • This tuning device 7 may be constituted by a warming u element (or by a piezoelectric device) able to define variation of the geometric dimensions of the portion of active material, and as a consequence of the dimensions of the resonating cavity. Even if not explicitly illustrate in the following figures this device is foreseen or ca however be applied to all embodiments of the invention.
  • Figure 3 shows a second embodiment of the device according to the invention.
  • This embodiment foresees in particular the presence of a first optical guide portion 30 of the type with grade refraction index at a length comprised between P/4 and P/2, thus to converge a beam of diverging radiation entering by the front side on a zone of the opposite terminal surface.
  • P is the so-called pitch, or the distance existing betwee two contiguous planes of perfect imaging.
  • this first focusing optical guide portion is put betwee the pumping laser 1 and the resonating cavity 2.
  • second focusing optical guide portion 31 also this one of a length comprised between P/4 and P/2 put between th cavity 2 and the optical fibre 6.
  • This second portio focuses in this way the diverging radiation entering by th front side on a zone of a sufficiently reduced dimension o the opposite terminal surface.
  • this embodiment is substantiall analogous to that illustrated before with respect to figur 1, with the said first optical guide portion 30 tha converges the diverging radiation ⁇ l emitted by the pumpin laser, a radiation which defines the emission of radiation ⁇ 2 by the active medium 3 that re-focuses at th centre of the resonating cavity 2, diverges again and i re-focused by said second focusing optical guide portio 31.
  • this radiation ⁇ 2 is coupled to the optical fibr 6 and is then sent to external modulation devices no shown.
  • Figure 4 illustrates a third embodiment of th invention differing from the embodiment shown in figure 3 by the fact that it foresees the use of a further focusin optical guide portion 40 allocated inside the resonatin cavity, and it is especially put between said portion o active material 3 and said mirror 5.
  • the other side of said portion of focusing optical guide 40 turns out to be flat and provided with said secon mirror 5 to which said portion of optical guide 31 is optically coupled, suitable to forward the radiation i output of the resonating cavity defined by the mirrors 4 and 5 to the optical fibre 6.
  • said tuning devices 7 are connected - in the specific case preferentially set up by a piezoelectric element - which act on the variable resistance R making it possible to modify the dimension of said interspace, and as a consequence the dimensions of said resonating cavity delimited by the mirrors 4 and 5. Therefore the optical guide 40 is called hereafter optical tuning guide.
  • the aiitireflecting coatings 41 and 42 prevent said interspace from introducing a variation in the refraction index, and that means in other words that this interface exerts an etalon function with consequent propagation inside the cavity of a single longitudinal mode.
  • the antireflex mirrors 41 and 42 prevent in this way the interspace from exerting the etalon function making so the propagation of a plurality of longitudinal modes possible.
  • the optical tuning guide 40 presents lengths comprised between 3/4 P and 1/2 P and the coupling optical guide in fibre 31 presents an approximate length equal to 3/4 p.
  • Figure 5 shows a constructive drawing of the device of figure 4 according to the present invention, and it shows in particular the above-said monolithic structure positioned on one submount element 51 sectioned in order to better evidence the allocation of this structure with respect to the laser diode 1 and the fibre 6.
  • the submount 51 consists of a metallic guide with rectangular cross section presenting at one end a raised portion 52 on which the laser 1 is welded, and at the other end it presents a "V-Groove" where the fibre 6 is positioned and blocked by adhesives.
  • Figure 6 shows a fourth embodiment of the inventio which differs from the previous ones by the fact that th first optical guide segment 30 is replaced by an optica fibre rod 60 suitable to connect laser 1 to said activ portion (laser) 3.
  • the remaining portion of the monolithi structure is absolutely analogous to that illustrated wit reference to figure 4.
  • Figure 7 shows a constructive drawing of said fourt embodiment (see figure 6) of the device according to th invention in which it is possible to see that sai monolithic structure is inserted in the interior of th female portion 70 of a connector for optical fibre systems.
  • this monolithi structure consists of the active portion (laser) 3 and o the portions of optical tuning guide 40 and of the couplin in fibre 31.
  • Figure 8 shows a fifth embodiment of the inventio which repeats the same element disposition previousl illustrated with reference to figure 4 with the exceptio that the second face of the active medium 3 is incline compared to the first face with an angle ⁇ R with a value o about 1°.
  • This fifth embodiment turns out to b advantageous compared to the forms of juxtaposio illustrated before when it is thought to be useful t eliminate the reflections of the radiations generated b the second face of said active portion. It is obviously understood that it is possible to us an active portion 3 shaped as illustrated in figure combined with the element disposition illustrated in figur
  • Figure 9 illustrates a sixth embodiment of the devic realized according to the invention differing from th fifth embodiment by the fact that the second face of th active portion 3 is inclined with respect to the first fac with an entity angle ⁇ B equal to the Brewester angle (equa to about 34° ) .
  • the inclination of said second face of th active portion 3 according to the above-said angle ⁇ B make it possible to obtain a linearly polarized radiation or radiation pending on a unique plane of polarization: thi characteristic turns out to be advantageous when th radiation corresponding on the fibre 6 is submitted to modulation procedure. In fact if this radiation turns ou to be linearly polarized the modulator is able to use 100 of the power associated to it.
  • the inclination of the second face of the activ medium 3 defines a deviation ⁇ D of the optical signal compared to the optical axis A, and therefore the above said radiations arrive on the first face of said optica tuning guide segment 40 in a position moving by a prese entity with respect to the optical axis A.
  • these radiations turn out to b focused on the second face of the optical guide segment i a position moving from the same entity and in a directio opposite to the previous one always compared to the optica axis.
  • the fibre 6 is consequently positioned in connectio to the focusing point at said distance 1 of the optica axis A.
  • Figure 10 illustrates a further embodiment making i possible to obtain in any case a radiation ⁇ l linearl polarized and to be conveyed on a fibre 6 disposed on th optical axis of the coupling lens in fibre 31.
  • the axis of the portion of active material 3 is inclined by an angle form of realization ⁇ D with respect to the optical axis of the elements 40 and 31.
  • the device according to the invention is constructe in a compact way with dimensions of about 4 cm ⁇ compatibl with the needs of optical fibre telecommunication systems. Moreover its realization is simple and of reasonable cost according to the mentioned objects of the invention.
  • the invention has bee illustrated with reference to the construction of a laser device including an active glass medium 3 - using Erbiu (Er) as a dopant and Ytterbium (Yb) as a co-dopant pumpe by a laser 1 at about 940 - 980 nm - in order to obtain device suitable to operate in connection with the so-calle third window.
  • Er Erbiu
  • Yb Ytterbium
  • the invention may be applied in othe situations and especially in combination with an activ medium consisting of a vitreous matrix realized wit silicates, phosphates and fluozirconates doped wit elements different from those specified above.
  • an activ medium consisting of a vitreous matrix realized wit silicates, phosphates and fluozirconates doped wit elements different from those specified above.
  • th invention may be used in combination with an active maximing of a crystal matrix this one also doped with elements different from those specified before.
  • vitreous matrix may use for example: A) Ytterbium as co-dopant and Erbium or Praseodymium as dopants, Yb3 + (Er, Pr);
  • E Mercury as co-dopant and Neodymium as dopant, Mg2 +(Nd); F) Thullium as co-dopant and Holmium as dopant, Tm3 + (Ho); G) Germanium as co-dopant and Erbium or Praseodymium as dopants, Ge4 + (Er, Pr).
  • the crystal matrix instead may for example use as dopants and co-dopant: Er:CaF2 or Er:LiYF4 for the realization of a lase suitable to emit radiations at a wavelength of 1.54 ⁇ , th so-called third window;
  • Nd:YAG or Nd:YLF for the realization of a lase suitable to emit radiations at a wavelength of 1.3 ⁇ m, the so-called second window.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Lasers (AREA)

Abstract

L'invention concerne un dispositif à laser de structure monolithique rallongée destiné à être utilisé dans les télécommunications. Ledit dispositif est constitué d'un laser de pompage (1) conçu pour émettre un rayonnement à une longueur d'onde μ1, d'une cavité résonante (2) et d'une fibre optique (6). Ladite cavité résonante comprend un premier et un deuxième miroirs (4 et 5) et une partie en matériau actif (3) conçue pour émettre un rayonnement à une longueur d'onde μ2 ⊃ μ1. Le premier miroir (4) qui est placé à la surface de la partie en matériau actif (3) faisant face au laser de pompage (1) est hautement transparent au rayonnement μ1 et hautement réfléchissant au rayonnement μ2. Le deuxième miroir (5) qui est placé à la surface de la partie en matériau actif (3) faisant face à la fibre optique (6) est hautement réfléchissant au rayonnement μ2.
EP94903848A 1992-12-18 1993-12-15 Dispositif a laser multi-mode Withdrawn EP0674815A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITMI922879A IT1256738B (it) 1992-12-18 1992-12-18 Dispositivo laser multimodale
ITMI922879 1992-12-18
PCT/EP1993/003631 WO1994015385A1 (fr) 1992-12-18 1993-12-15 Dispositif a laser multi-mode

Publications (1)

Publication Number Publication Date
EP0674815A1 true EP0674815A1 (fr) 1995-10-04

Family

ID=11364481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94903848A Withdrawn EP0674815A1 (fr) 1992-12-18 1993-12-15 Dispositif a laser multi-mode

Country Status (3)

Country Link
EP (1) EP0674815A1 (fr)
IT (1) IT1256738B (fr)
WO (1) WO1994015385A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2324645A (en) * 1997-04-25 1998-10-28 Precision Instr Dev Center Nat Single-mode solid-state diode-pumped lasers
EP2074684B1 (fr) 2006-06-08 2016-03-23 Ramesh K. Shori Procédé de pompage multi-longueur d'onde pour améliorer la performance des lasers à erbium

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4797893A (en) * 1987-06-09 1989-01-10 Virgo Optics, Inc. Microlaser system
US4884281A (en) * 1988-09-09 1989-11-28 Spectra-Physics, Inc. Low cost/power visible light solid-state laser
DE4039455A1 (de) * 1990-12-11 1992-06-17 Messerschmitt Boelkow Blohm Festkoerperlaser

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9415385A1 *

Also Published As

Publication number Publication date
IT1256738B (it) 1995-12-15
WO1994015385A1 (fr) 1994-07-07
ITMI922879A1 (it) 1994-06-18
ITMI922879A0 (it) 1992-12-18

Similar Documents

Publication Publication Date Title
US6208679B1 (en) High-power multi-wavelength external cavity laser
EP1209783A2 (fr) Module laser à semiconducteur et amplificateur raman
EP0812039B1 (fr) Source de lumière à fibre optique avec coupleur à fibre multimode
US5555127A (en) Planar hybrid optical amplifier
US6192062B1 (en) Beam combining of diode laser array elements for high brightness and power
US5497265A (en) High-power signals optical generator for telecommunication systems
EP1300703A2 (fr) Module laser à semiconducteur et méthode pour simultanément réduire le bruit d'intensité relative et la diffusion Brillouin stimulée
EP0444694B1 (fr) Coupleur optique
US6288833B1 (en) Optical device
US6433920B1 (en) Raman-based utility optical amplifier
NO843902L (no) Fiberoptisk forsterker
CA2400466A1 (fr) Laser a semi-conducteurs ou a corps solide a cavite de fibre exterieure
GB2207322A (en) Optical amplification
US20110141758A1 (en) Optical coupler and active optical module comprising the same
US6856455B2 (en) Light source apparatus, optical amplifier and optical communication system
US6310717B1 (en) Optical amplifier and fiber module for optical amplification
EP1272878B1 (fr) Diode superluminescente haute puissance a guide d'onde courbe multipasse
US5426656A (en) Laser element doped with rare earth ions, optical amplifier element doped with rare earth ions and rare-earth-ion-doped short-wavelength laser light source apparatus
JP2937196B1 (ja) ファイバグレーティング半導体レーザ
US5369524A (en) Optical fiber monofrequency power source
US6246511B1 (en) Apparatus and method to compensate for optical fiber amplifier gain variation
WO1994015385A1 (fr) Dispositif a laser multi-mode
US20020075914A1 (en) Semiconductor laser module, laser unit, and raman amplifier
CN1399810A (zh) 泵式激光器的选模刻面层
US3968456A (en) Regenerative laser device

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19950616

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB NL SE

17Q First examination report despatched

Effective date: 19961011

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19990623