WO2005064757A1 - A novel twin side laser resonator - Google Patents

A novel twin side laser resonator Download PDF

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Publication number
WO2005064757A1
WO2005064757A1 PCT/IN2004/000010 IN2004000010W WO2005064757A1 WO 2005064757 A1 WO2005064757 A1 WO 2005064757A1 IN 2004000010 W IN2004000010 W IN 2004000010W WO 2005064757 A1 WO2005064757 A1 WO 2005064757A1
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WO
WIPO (PCT)
Prior art keywords
laser
resonator
novel twin
twin side
laser resonator
Prior art date
Application number
PCT/IN2004/000010
Other languages
French (fr)
Inventor
Arvindbhai Lavjibhai Patel
Original Assignee
Arvindbhai Lavjibhai Patel
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 Arvindbhai Lavjibhai Patel filed Critical Arvindbhai Lavjibhai Patel
Publication of WO2005064757A1 publication Critical patent/WO2005064757A1/en

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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
    • H01S3/02—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
    • H01S3/10—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
    • 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
    • H01S3/05—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
    • H01S3/0804—Transverse or lateral modes
    • H01S3/08045—Single-mode emission
    • 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
    • H01S3/0804—Transverse or lateral modes
    • H01S3/0805—Transverse or lateral modes by apertures, e.g. pin-holes or knife-edges
    • 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
    • H01S3/1611—Solid materials characterised by an active (lasing) ion rare earth neodymium
    • 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
    • H01S3/163—Solid materials characterised by a crystal matrix
    • H01S3/164—Solid materials characterised by a crystal matrix garnet
    • H01S3/1643—YAG

Definitions

  • the industrial laser resonators are commonly consisting with an active medium, a pumping mechanism and resonator cavity.
  • Resonator composed of end-mirrors between which the atoms and molecules of the active medium lies and excited, i.e. pumped by the pumping mechanism, and between which stimulated emission of radiation from the active medium is initiated, and amplified by back and forth reflections traveling through the active medium.
  • one mirror called the output coupler mirror, is partially transmissive and second mirror is totally reflective.
  • the transmitted part of the stimulated emission of radiation constitutes the usable output laser beam.
  • twin side laser resonator is invented. It has a unique design such that at both end of the resonator, laser beam is obtained which in turn used for laser material processing in the industrial sectors mentioned above.
  • Fig.l represents front view of the twin side processing laser resonator.
  • Fig.2 represents top view of the twin side Processing laser resonator. Disclosure of Invention:
  • Figure 1 is a front view showing configuration of a laser resonator.
  • a laser head 2 & 3 are out put mirrors located on both side of , the laser head 1.
  • Rod is made of Nd:YAG/ Nd:Glass and it works as-'a pumping source to produce more photons.
  • Nd atoms are doped into YAG material or glass and this doping proportion consist of 0.5% - 0.9% and it may vary according to process requirement. These photons fall on flash/arc lamp, which ultimately produces laser light.
  • Two output mirrors 2 & 3 . having reflection ratio between 60%-92% are placed at both end of laser resonator to amplify
  • Reference number 4 & 5 are apertures provided between the out put
  • Reference number 6 is poloriser, 7 Q-switch and 8-shutter mount are
  • Reference number 7 is Q - switch serves as a fast acting switch for pulsing the laser on and off.
  • Reference number 9 & 10 are beam expanders placed to expand the laser beam, 11 & 12 are motorized shutters which are provided at out side the resonance area motorized shutters, which are located at 11 & 12 blocks & transmit the laser beam automatically.
  • the output mirrors 2 & 3 are placed on both side of the laser head 1, light is repeatedly reflected between the output mirrors 2 & 3, and the light passes through the laser head whereby induced emission is generated.
  • the laser beam is amplified and radiated by means of this induced emission and the beam going around between the output mirrors 2 & 3.
  • the out put mirrors 2 & 3 has the characteristics that it reflects a portion of the laser beam and transmits the remaining
  • the apertures 4 & 5 are used for further amplification.
  • means has a function for deciding a form of a beam mode generated between the
  • a twin side processing laser resonator at both end of the same, laser beam is

Abstract

A Twin side Laser resonator includes a laser head (1) which has a high gain medium such as a lightly doped Nd:YAG rod or Nd: Glass rod contained within optical resonator wherein laser beam flows from the optical axis of the same. The laser beam from the both end of the resonator is coupled out by means of output mirrors (2, 3). The output beam is collimated in the region of the out put mirrors (2, 3). The said laser head (1) provided between the output mirrors (2, 3) for causing induced emission; an aperture means (4, 5) for deciding a beam mode of a laser beam generated between the output mirrors (2, 3). Apertures means (4, 5) are provided between output mirrors (2, 3) and set to a specified hole diameter. Also apertures restricts the light amplification along the off-axis of laser resonator and thus provides sharp frequency band.

Description

A NOVEL TWIN SIDE LASER RESONATOR Background Art:
The industrial laser resonators are commonly consisting with an active medium, a pumping mechanism and resonator cavity. Resonator composed of end-mirrors between which the atoms and molecules of the active medium lies and excited, i.e. pumped by the pumping mechanism, and between which stimulated emission of radiation from the active medium is initiated, and amplified by back and forth reflections traveling through the active medium. In most stable resonators, one mirror, called the output coupler mirror, is partially transmissive and second mirror is totally reflective. The transmitted part of the stimulated emission of radiation constitutes the usable output laser beam. In most of the resonators, part of the stimulated emission of radiation is not reflected back in the resonator cavity, partly because of diffraction losses, and constitutes the usable output laser beam. Laser material processing such as cutting, welding, drilling etc. are required in various industrial sectors like automobile, tooling, surgical & orthopedics, electronics & communication, Bio-medical, Non-conventional engineering for which a laser beam is
required. Laser resonators being used in above industrial sectors provides one sided
laser material processing and hence the process becomes costly, time & electricity
consuming. In addition such laser resonators occupy more space, needed more
consumables which in turn reduces the productivity.
Technical Field:
To overcome such limitations experienced by above laser resonator, a novel
twin side laser resonator is invented. It has a unique design such that at both end of the resonator, laser beam is obtained which in turn used for laser material processing in the industrial sectors mentioned above. Brief description of drawings:
The present invention will be described with greater specific and clarity with reference to following drawings:
Fig.l represents front view of the twin side processing laser resonator. Fig.2 represents top view of the twin side Processing laser resonator. Disclosure of Invention:
Figure 1 is a front view showing configuration of a laser resonator. In the Fig.l and 2 designated at the reference numeral 1 is a laser head, 2 & 3 are out put mirrors located on both side of , the laser head 1. In laser head 1, Rod is made of Nd:YAG/ Nd:Glass and it works as-'a pumping source to produce more photons. Nd atoms are doped into YAG material or glass and this doping proportion consist of 0.5% - 0.9% and it may vary according to process requirement. These photons fall on flash/arc lamp, which ultimately produces laser light. Two output mirrors 2 & 3. having reflection ratio between 60%-92% are placed at both end of laser resonator to amplify
the laser light. Q-Switch produces a powerful pulse from the continuous beam. Since
both out put mirrors having reflectivity of 60%-92% and hence from both end of the
out put mirrors, laser beam can be attained which in turn used to provide particular
application. Reference number 4 & 5 are apertures provided between the out put
mirrors 2 & 3 to set a specified hole diameter. Also apertures 4 & 5 are restrict the
light amplification along the off-axis of laser resonator and thus provides sharp
frequency band. Reference number 6 is poloriser, 7 Q-switch and 8-shutter mount are
placed in a laser resonator. Stimulated emission of radiation from the laser head is initiated between two output mirrors 2 & 3, and amplified by back and forth reflection. Reference number 7 is Q - switch serves as a fast acting switch for pulsing the laser on and off. Reference number 9 & 10 are beam expanders placed to expand the laser beam, 11 & 12 are motorized shutters which are provided at out side the resonance area motorized shutters, which are located at 11 & 12 blocks & transmit the laser beam automatically. As the output mirrors 2 & 3 are placed on both side of the laser head 1, light is repeatedly reflected between the output mirrors 2 & 3, and the light passes through the laser head whereby induced emission is generated. The laser beam is amplified and radiated by means of this induced emission and the beam going around between the output mirrors 2 & 3. The out put mirrors 2 & 3 has the characteristics that it reflects a portion of the laser beam and transmits the remaining
portion there through. So that the transmitted beam is taken out to outside as a laser
beam, and the reflected beam is used for further amplification. The apertures 4 & 5
means has a function for deciding a form of a beam mode generated between the
output mirrors 2 & 3. In a stable system, the beam reflected from the mirrors in turn is
periodically focused, while in an unstable system the beam broadens more and more
with each reflection.
A twin side processing laser resonator at both end of the same, laser beam is
obtained which in turn used for laser material processing in the various industrial
sectors such as automobile, tooling, surgical & orthopedics, electronics &
communication, Bio-medical, Non-conventional engineering.

Claims

Claims 1. A Novel Twin side Laser resonator comprising of two output mirrors, laser head, Q- switch, shutter, aperture, Pumping mechanism and poloriser (a) Each mirror is placed on both side of laser head; (b) Laser head is place between the two output Mirrors;
(c) Q-switch is placed between laser hade and right side aperture;
(d) Poloriser is placed between left side aperture and laser head;
(e) shutter is placed between poloriser and laser head.
2. A Novel Twin side Laser resonator, as claimed in claim 1 wherein in the said laser head, Neodymium atoms are doped into YAG material and this doping proportion consists of 0.5%-0.9%.
3. A Novel Twin side Laser resonator, as claimed in claim 1 wherein the said both output mirrors have the reflection ratio between 60%-92%.
4. A Novel Twin side Laser resonator as claimed in claim 1 wherein the lasing gain medium in the laser head is a solid, liquid, gas or plasma.
5. A Novel Twin side Laser resonator as claimed in claim 1 wherein the laser beam is operates either in CW (Continuous Waιve)or in PM (Pulse Mode).
6. A Novel Twin side Laser resonator as claimed in Claim 1 wherein the laser power is divide the laser light into two parts and both parts process the material independently.
7. A Novel Twin side Laser resonator as claimed in Claim 1 wherein the laser beam is either polorised or unpolarised as per the requirement for material processing.
8. A Novel Twin side Laser resonator as claimed in claim 1 wherein optics-shutter mechanism is reflected unused side's laser to absorbing medium.
9. A Novel Twin side Laser resonator as claimed in claim 1 wherein each two highly reflecting mirror are plane-plane, plane-spherical, spherical-spherical and in any combination.
10. A Novel Twin side Laser, resonator substantially herein described with reference to the foregoing description and the accompanying drawings.
PCT/IN2004/000010 2003-12-29 2004-01-16 A novel twin side laser resonator WO2005064757A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN1317MU2003 2003-12-29
IN1317/MUM/2003 2003-12-29

Publications (1)

Publication Number Publication Date
WO2005064757A1 true WO2005064757A1 (en) 2005-07-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2157061A3 (en) * 2008-07-24 2011-11-16 Alliant Techsystems Inc. Optical devices comprising doped glass materials, laser systems including such optical devices, and methods of forming such optical devices and laser systems
CN105234559A (en) * 2015-11-01 2016-01-13 泉州黄章智能科技有限公司 Miniature etching device for laser channel

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007271A1 (en) * 1980-02-27 1981-10-15 Johannes Dipl.-Phys. Dr. 3008 Garbsen Ebert Optical resonator for helium-selenium laser - uses twin resonators for mixing of three primary colours
EP0109254A2 (en) * 1982-11-13 1984-05-23 Yuk Wah Joseph Koo Single mode pulsed laser
US4467172A (en) * 1983-01-03 1984-08-21 Jerry Ehrenwald Method and apparatus for laser engraving diamonds with permanent identification markings
US4899343A (en) * 1988-01-20 1990-02-06 Ciba-Geigy Ag Laser layout
EP0525891A1 (en) * 1991-07-23 1993-02-03 International Business Machines Corporation Method and apparatus for an increased pulse repetition rate for a CW pumped laser
JP2003141679A (en) * 2001-11-05 2003-05-16 National Research Institute Of Police Science Japan Automatic recorder for vehicle of disregarding traffic signal, and method therefor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007271A1 (en) * 1980-02-27 1981-10-15 Johannes Dipl.-Phys. Dr. 3008 Garbsen Ebert Optical resonator for helium-selenium laser - uses twin resonators for mixing of three primary colours
EP0109254A2 (en) * 1982-11-13 1984-05-23 Yuk Wah Joseph Koo Single mode pulsed laser
US4467172A (en) * 1983-01-03 1984-08-21 Jerry Ehrenwald Method and apparatus for laser engraving diamonds with permanent identification markings
US4899343A (en) * 1988-01-20 1990-02-06 Ciba-Geigy Ag Laser layout
EP0525891A1 (en) * 1991-07-23 1993-02-03 International Business Machines Corporation Method and apparatus for an increased pulse repetition rate for a CW pumped laser
JP2003141679A (en) * 2001-11-05 2003-05-16 National Research Institute Of Police Science Japan Automatic recorder for vehicle of disregarding traffic signal, and method therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2157061A3 (en) * 2008-07-24 2011-11-16 Alliant Techsystems Inc. Optical devices comprising doped glass materials, laser systems including such optical devices, and methods of forming such optical devices and laser systems
US8218593B2 (en) 2008-07-24 2012-07-10 Alliant Techsystems Inc. Optical devices comprising doped glass materials, laser systems including such optical devices, and methods of forming such optical devices and laser systems
CN105234559A (en) * 2015-11-01 2016-01-13 泉州黄章智能科技有限公司 Miniature etching device for laser channel

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