WO1992015135A1 - Laser - Google Patents

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Publication number
WO1992015135A1
WO1992015135A1 PCT/EP1992/000295 EP9200295W WO9215135A1 WO 1992015135 A1 WO1992015135 A1 WO 1992015135A1 EP 9200295 W EP9200295 W EP 9200295W WO 9215135 A1 WO9215135 A1 WO 9215135A1
Authority
WO
WIPO (PCT)
Prior art keywords
laser
crystal
resonators
pump radiation
laser according
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.)
Ceased
Application number
PCT/EP1992/000295
Other languages
German (de)
English (en)
Inventor
Peter Reimer
Maximilian Reindl
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.)
Aesculap AG
Original Assignee
Aesculap AG
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 Aesculap AG filed Critical Aesculap AG
Publication of WO1992015135A1 publication Critical patent/WO1992015135A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2383—Parallel arrangements
    • 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
    • H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
    • H01S3/092—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light of flash lamp

Definitions

  • the invention relates to a laser with a pump radiation source, a resonator arrangement in which there is a crystal made of a laser-active material arranged between two mirrors, and with a reflector reflecting the pump radiation and directing it onto the crystal.
  • Such a laser arrangement is usually used to generate laser radiation with a specific wavelength by means of a laser-active crystal, for example with an Er.YAG laser crystal, radiation with a wavelength of 2.94 ⁇ m or with an NdrYAG laser crystal a wavelength of 1.06 ⁇ m.
  • a laser-active crystal for example with an Er.YAG laser crystal, radiation with a wavelength of 2.94 ⁇ m or with an NdrYAG laser crystal a wavelength of 1.06 ⁇ m.
  • This object is achieved according to the invention in the case of a laser of the type described at the outset in that, in addition to the pump radiation source and in addition to the resonator arrangement, there is at least one further resonator arrangement with two mirrors and a crystal of laser-active material arranged therebetween that the crystal of the Another resonator arrangement is acted upon by the radiation of the single pump radiation source directly or via the reflector with the pump radiation and that the crystal of the further resonator arrangement consists of a material which is different from the material of the other crystal, so that the two crystals have a different wavelength ⁇ Generate rich laser radiation.
  • a single pump radiation source for example a flash or arc lamp
  • a single pump radiation source for example a flash or arc lamp
  • the laser-active material in the further resonator is also excited by the same pump radiation source, the reflector reflecting the pump radiation irradiating the laser-active crystals in all resonators.
  • the pump radiation source is arranged in the middle between the resonators.
  • diaphragms that can be inserted into the beam path of the resonators are provided. In this way it is possible to specifically suppress the laser activity in different resonators, so that then only the laser resonators emit radiation in which no diaphragm is inserted. It can be provided, for example, that the diaphragms can be inserted in such a way that only one resonator oscillates at a time. Radiation with a certain wavelength can therefore be selected by inserting the diaphragms.
  • a laser which can be used in particular in the medical field is characterized in that one crystal is doped with erbium, the other with neodymium, for example one crystal can be an Er: YAG crystal, the other an Nd: YAG crystal. Crystal. Such a crystal can optionally be used to generate laser radiation which is used for cutting tissue or for coagulating tissue.
  • the beams emerging from the resonators can be directed into a single beam path by optical means, but it is also possible that each of the beams emerging from the resonators is directed separately into its own radiation transmitter, for example into an optical fiber.
  • one crystal is doped with holmium or tulium, the other with neodymium.
  • Fig. 2 is a sectional view taken along line 2-2 in Fig. 1 and
  • FIG. 3 a view similar to FIG. 2 with a pump chamber with four laser resonators.
  • the pump chamber 1 of a laser device shown in FIG. 1 centrally receives a pump radiation source 2, for example a flash lamp or an arc discharge lamp, which are supplied via a voltage supply in a manner not explained in the drawing.
  • a pump radiation source 2 for example a flash lamp or an arc discharge lamp
  • Each of the two laser crystals 3, 4 is arranged between two mirrors 5, 6 and 7, 8, respectively, with mirrors 5 and 6 on the one hand and mirrors 7 and 8 on the other each forming a resonator. These are therefore adjusted according to the wavelength emitted by the laser crystal.
  • one mirror 5, 7 of the two resonators is designed to be totally reflective, while the other mirror 6 or 8 is partially transparent, so that laser radiation can be coupled out of the respective resonator.
  • the outcoupled radiation is directed via a partially transparent mirror 9 or, in the case of the other laser resonator, via a deflecting mirror 10 and this partially transparent mirror 9 into a single beam path 11 which leads out of the pump chamber 1.
  • the walls of the pump chamber 1 are designed as a reflector 12, the walls for the radiation from the pump radiation source 2 preferably being diffusely reflective, for example these walls can be made of plastic or of a metal mirror with a rough surface.
  • An orifice 13, 14 can be inserted into each laser resonator, which are shown in broken lines in the illustration in FIG. 1.
  • a drive is generally assigned to these diaphragms 13 and 14, so that the diaphragm is either inserted in one of the resonators or, if radiation from both resonators is desired at the same time, in neither resonator.
  • the pump radiation generated by the pump radiation source 2 falls on the laser crystals 3 and 4 in the same way, so that both crystals are excited and laser activity is generated in the respective resonators.
  • laser radiation is coupled out of the two laser resonators, provided the diaphragms 13 and 14 are not inserted.
  • the laser beams can be selectively interrupted by inserting the respective apertures 13 or 14, ie the user can easily select the radiation with the desired wavelength.
  • both laser resonators are supplied with only a single pump radiation source, so that the structure is very simple.
  • the pump radiation source 2 is surrounded by four correspondingly constructed laser resonators, each of which contains its own laser-active medium. All four resonators are pumped by a single pump radiation source. As in the exemplary embodiment of FIGS. 1 and 2, diaphragms can be inserted into the individual resonators in order to selectively switch them off.

Landscapes

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

Abstract

Un laser (1) comprend une source (2) de rayonnement de pompage, un dispositif résonateur, dans lequel un cristal (3) en un matériau laser actif est situé entre deux miroirs (5, 6), et un réflecteur (12) qui réfléchit le rayonnement de pompage, le dirigeant sur le cristal. Afin d'obtenir un laser ayant une structure plus simple et capable de générer des faisceaux laser ayant différentes longueurs d'onde, au moins un dispositif résonateur supplémentaire comprenant deux miroirs (7, 8), entre lesquels est disposé un cristal (4) en un matériau laser actif, est situé à côté de la source de rayonnement de pompage et du premier dispositif résonateur. Le cristal du dispositif résonateur supplémentaire reçoit le rayonnement du pompage de la seule source de rayonnement de pompage directement et à travers le réflecteur. Le cristal (4) du dispositif résonateur supplémentaire est composé d'un matériau différent du matériau dont se compose l'autre cristal (3), de sorte que les deux cristaux génèrent des rayonnements laser dans des plages diverses de longueurs d'onde.
PCT/EP1992/000295 1991-02-23 1992-02-12 Laser Ceased WO1992015135A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4105717.1 1991-02-23
DE19914105717 DE4105717A1 (de) 1991-02-23 1991-02-23 Laser

Publications (1)

Publication Number Publication Date
WO1992015135A1 true WO1992015135A1 (fr) 1992-09-03

Family

ID=6425736

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/000295 Ceased WO1992015135A1 (fr) 1991-02-23 1992-02-12 Laser

Country Status (2)

Country Link
DE (1) DE4105717A1 (fr)
WO (1) WO1992015135A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032862A (en) * 1974-02-14 1977-06-28 The Perkin-Elmer Corporation High power electrodeless gas arc lamp for pumping lasers
JPS60239078A (ja) * 1984-05-11 1985-11-27 Toshiba Corp 固体レ−ザ発振装置
JPH022190A (ja) * 1988-06-14 1990-01-08 Hamamatsu Photonics Kk レーザ装置
EP0368512A2 (fr) * 1988-11-10 1990-05-16 Premier Laser Systems, Inc. Laser médical à longueurs d'ondes multiples

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3232952A1 (de) * 1982-09-04 1984-03-08 Anton Dipl.-Ing. Gugg (FH), 8000 München Festkoerperlaser mit mehr als einem laserstab
CN85105775B (zh) * 1985-07-31 1987-12-23 华东工学院 序列脉冲激光瞬态全息摄影仪
CA1320559C (fr) * 1988-09-05 1993-07-20 Noboru Nakano Lasers, systeme comportant ces lasers et miroir pour ce systeme

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032862A (en) * 1974-02-14 1977-06-28 The Perkin-Elmer Corporation High power electrodeless gas arc lamp for pumping lasers
JPS60239078A (ja) * 1984-05-11 1985-11-27 Toshiba Corp 固体レ−ザ発振装置
JPH022190A (ja) * 1988-06-14 1990-01-08 Hamamatsu Photonics Kk レーザ装置
EP0368512A2 (fr) * 1988-11-10 1990-05-16 Premier Laser Systems, Inc. Laser médical à longueurs d'ondes multiples

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 95 (E-395)(2152) 12. April 1986 & JP,A,60 239 078 ( TOSHIBA ) 27. November 1985 *
PATENT ABSTRACTS OF JAPAN vol. 14, no. 133 (E-902)(4076) 13. März 1990 & JP,A,2 002 190 ( HAMAMATSU PHOTONICS ) 8. Januar 1990 *

Also Published As

Publication number Publication date
DE4105717A1 (de) 1992-08-27

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