FR2236614A1 - Laser machining and heating of matls. - using controlled switching pulse to convert matl. to energy-absorbing state - Google Patents

Laser machining and heating of matls. - using controlled switching pulse to convert matl. to energy-absorbing state

Info

Publication number
FR2236614A1
FR2236614A1 FR7423777A FR7423777A FR2236614A1 FR 2236614 A1 FR2236614 A1 FR 2236614A1 FR 7423777 A FR7423777 A FR 7423777A FR 7423777 A FR7423777 A FR 7423777A FR 2236614 A1 FR2236614 A1 FR 2236614A1
Authority
FR
France
Prior art keywords
matl
pulse
switching pulse
energy
laser
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Withdrawn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
FR7423777A
Other languages
French (fr)
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.)
Lasag AG
Original Assignee
Lasag 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 Lasag AG filed Critical Lasag AG
Publication of FR2236614A1 publication Critical patent/FR2236614A1/en
Withdrawn legal-status Critical Current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
    • H01S3/10—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
    • H01S3/1123—Q-switching
    • H01S3/113—Q-switching using intracavity saturable absorbers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B29C65/1619—Mid infrared radiation [MIR], e.g. by CO or CO2 lasers

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Laser Beam Processing (AREA)

Abstract

At least the temporary conversion of a matl. into a condition where it absorbs optical energy is effected by exposing it to a laser switching pulse (sw) with there three characteristics: (a) the build-up time tsw is 1 mu s; (b) the intensity Isw is >107 W/cm2; and (c) the pulse-time Tsw is shorter 10 mu s. After the laser switching pulse and during the time ABSORPTION where the matl. absorbs optical energy, a laser pulse or pulse-train is pref. applied for working the matl; the energy of the switching pulse (w) should be small enough to avoid any removal of the matl. being worked. Optimum focussing and establishment of parameters dependent on wavelength is attained so that e.g. a CO2 laser can be used for the economic drilling of holes in otherwise highly reflecting matl. The method is applicable to drilling, melting, and hardening.
FR7423777A 1973-07-11 1974-07-09 Laser machining and heating of matls. - using controlled switching pulse to convert matl. to energy-absorbing state Withdrawn FR2236614A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1008973A CH570846A5 (en) 1973-07-11 1973-07-11

Publications (1)

Publication Number Publication Date
FR2236614A1 true FR2236614A1 (en) 1975-02-07

Family

ID=4359208

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7423777A Withdrawn FR2236614A1 (en) 1973-07-11 1974-07-09 Laser machining and heating of matls. - using controlled switching pulse to convert matl. to energy-absorbing state

Country Status (6)

Country Link
JP (1) JPS5039960A (en)
CH (1) CH570846A5 (en)
DE (1) DE2430994A1 (en)
FR (1) FR2236614A1 (en)
IT (1) IT1015539B (en)
SE (1) SE7409007L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711889C3 (en) * 1977-03-18 1982-03-11 Kernforschungsanlage Juelich Gmbh, 5170 Juelich Process for excavating channels in workpieces with the aid of laser pulses and a device for carrying out this process
DE3126953C2 (en) * 1981-07-08 1983-07-21 Arnold, Peter, Dr., 8000 München Process for the thermal treatment of the surface of workpieces by means of a linearly polarized laser beam

Also Published As

Publication number Publication date
SE7409007L (en) 1975-01-13
DE2430994A1 (en) 1975-01-30
CH570846A5 (en) 1975-12-31
JPS5039960A (en) 1975-04-12
IT1015539B (en) 1977-05-20

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Legal Events

Date Code Title Description
ST Notification of lapse