CN113991412A - Intermediate infrared Q-switched laser based on YIG magneto-optical crystal - Google Patents

Intermediate infrared Q-switched laser based on YIG magneto-optical crystal Download PDF

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Publication number
CN113991412A
CN113991412A CN202111080926.2A CN202111080926A CN113991412A CN 113991412 A CN113991412 A CN 113991412A CN 202111080926 A CN202111080926 A CN 202111080926A CN 113991412 A CN113991412 A CN 113991412A
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laser
optical
magneto
yig
optical crystal
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CN202111080926.2A
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Inventor
游振宇
涂朝阳
王燕
朱昭捷
李坚富
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Fujian Institute of Research on the Structure of Matter of CAS
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Fujian Institute of Research on the Structure of Matter of CAS
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    • 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
    • H01S3/1124—Q-switching using magneto-optical devices
    • 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
    • H01S3/10061—Polarization control
    • 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
    • H01S3/1613—Solid materials characterised by an active (lasing) ion rare earth praseodymium

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

Abstract

The invention discloses a mid-infrared Q-switched laser based on a YIG (Yttrium iron garnet) magneto-optical crystal, which comprises a pumping source, a laser gain medium, an optical polarization element and the YIG magneto-optical crystal, wherein the laser gain medium, the optical polarization element and the YIG magneto-optical crystal are sequentially arranged along the transmission direction of a laser beam; the medium infrared Q-switched laser can generate short-pulse high-power erbium laser with a medium infrared band of 2.7-3.0 microns, and has the advantages of low cost, compact structure, good stability, convenience in carrying, and stable and controllable pulse width and repetition frequency.

Description

Intermediate infrared Q-switched laser based on YIG magneto-optical crystal
Technical Field
The invention relates to a mid-infrared Q-switched laser based on a YIG magneto-optical crystal, and belongs to the technical field of optical instruments.
Background
Er3+、Pr3+The ion activation can realize mid-infrared laser with 2.7-3.0 μm wave band, and the wave bands are all located in the characteristic absorption wave band of water molecules, so that the ion activation has attractive application prospect in laser surgery, laser cosmetology, laser radar and infrared laser countermeasure, but many applications need high peak power Q-switched pulse laser output, so the Q-switched laser with the wave bands becomes the main direction of laser technology development.
The active Q-switching technique can autonomously control the pulse repetition frequency of the Q-switched laser, so that the active Q-switching becomes an indispensable Q-switching mode in many applications. Currently, the active Q-switching technology generally adopted in the above wave bands adopts electro-optic or acousto-optic as a Q-switching element, and adopts higher voltage to control the loss of a laser resonant cavity, thereby realizing Q-switching laser output. The electro-optic Q-switching crystal is required to be placed in a resonant cavity, and the electro-optic Q-switching crystal which can be applied to a 2.7-3.0 mu m wave band is rare in types at present. And meanwhile, a half-wave voltage of several kilovolts is required, so that the device is large in size and complex. Although the voltage is low, the modulation depth is not enough, and the acousto-optic Q-switching crystal can only be applied to some lasers with low average output power, and meanwhile, no matter the acousto-optic Q-switching crystal or the electro-optic Q-switching crystal is adopted, the crystal size is large, so that the length and the loss of a laser resonant cavity are increased, the cost of the laser is improved, and the stability, the convenience and the portability of the laser are reduced.
Disclosure of Invention
The invention provides a mid-infrared Q-switched laser based on a YIG magneto-optical crystal, which has the advantages of low cost, compact structure, good stability, portability, stable and controllable pulse width and repetition frequency.
The invention provides a mid-infrared Q-switched laser based on a YIG magneto-optical crystal, which comprises a pumping source, a laser resonant cavity, a laser gain medium, an optical polarization element, the YIG magneto-optical crystal and a magnetic field generator, wherein the pumping source is connected with the laser resonant cavity;
the pump source is used for generating a laser beam;
the laser gain medium, the optical polarization element and the YIG magneto-optical crystal are sequentially arranged in the laser resonant cavity along the transmission direction of the laser beam;
the magnetic field generator is arranged at the periphery of the optical path of the YIG magneto-optical crystal and used for generating a magnetic field; the magnetic field generator and the YIG magneto-optical crystal jointly form a magneto-optical isolator;
the laser beam is used for pumping the laser gain medium;
the optical polarization element is used for limiting laser of the intracavity resonance to be linearly polarized laser;
the magnetic field generator is also used for regulating and controlling the magnetic field intensity, so that the YIG magneto-optical crystal generates a Faraday magneto-optical effect;
the YIG magneto-optical crystal is also used to deflect the linearly polarized laser light through the crystal in a single pass through 45 deg..
Optionally, the linearly polarized laser light is deflected by 45 ° by a single pass through the crystal by controlling the strength of the magnetic field applied to the YIG magneto-optical crystal or the thickness of the YIG magneto-optical crystal.
Optionally, the laser gain medium is Er3+Or Pr3+An ion activated laser crystal.
Optionally, the intermediate infrared Q-switched laser further includes an input mirror and an output mirror;
the input mirror is positioned on one side of the laser gain medium, which is far away from the YIG magneto-optical crystal;
the output mirror is positioned on one side of the YIG magneto-optical crystal, which is far away from the laser gain medium, and is used for emitting laser beams.
Optionally, the pump source is disposed on a side of the input mirror away from the output mirror;
the intermediate infrared Q-switched laser further comprises a light beam coupling module, wherein the light beam coupling module is arranged between the pumping source and the input mirror and used for focusing and coupling the laser beam.
Optionally, the pump source is disposed between the input mirror and the optical polarization element, a direction in which the laser gain medium, the optical polarization element, and the YIG magneto-optical crystal are disposed is defined as a first direction, and the pump source is disposed around the first direction at a periphery of the laser gain medium;
the input mirror is a total reflection mirror and is used for totally reflecting the laser beam emitted by the pumping source, and the reflected laser beam is parallel to the first direction.
Optionally, the number of the pump sources is multiple, and the pump sources are uniformly distributed on the periphery of the gain medium.
Optionally, the pumping source is a semiconductor pumping laser with an output wavelength of 976nm or other wavelengths, and the semiconductor pumping laser is used for pumping Er3+Activation and Pr3+An ion activated laser crystal.
The invention can produce the beneficial effects that:
the medium-infrared Q-switched laser can generate short-pulse high-power erbium laser or praseodymium laser in a medium-infrared band of 2.7-3.0 microns; the YIG magneto-optical crystal is used as a Q-switching element, so that the problem that the laser in the wave band is lack of a stable Q-switching element at present is solved; and the pulse width and the repetition frequency are stable and controllable.
The mid-infrared Q-switched laser controls the rotation of the polarization direction of a laser beam passing through a YIG magneto-optical crystal through the magnetic field generator, and controls the on-off state of a laser resonant cavity by combining with the optical polarization element.
The intermediate infrared Q-switched laser has a simple structure, is convenient for the mutual matching of all elements, prolongs the service life of the whole device and does not need frequent maintenance.
Drawings
Fig. 1 is a schematic structural diagram of a mid-infrared Q-switched laser provided in embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a mid-infrared Q-switched laser provided in embodiment 2 of the present invention.
List of parts and reference numerals:
101. a pump source; 201. an input mirror; 202. an output mirror; 301. a laser gain medium; 302. YIG magneto-optical crystal; 303. an optical polarizing element; 401. a light beam coupling module; 402. a magnetic field generator.
Detailed Description
The present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a mid-infrared Q-switched laser based on a YIG magneto-optical crystal, which includes a pump source 101, a laser resonator, a laser gain medium 301, an optical polarization element 303, a YIG magneto-optical crystal 302, and a magnetic field generator 402.
The pump source 101 is a semiconductor pump laser having an output wavelength of 976nm, and the pump source 101 is used to generate a laser beam.
The laser gain medium 301, the optical polarization element 303 and the YIG magneto-optical crystal 302 are sequentially arranged in the laser resonant cavity along the transmission direction of the laser beam.
The magnetic field generator 402 is arranged at the periphery of the optical path of the YIG magneto-optical crystal 302 and is used for generating a magnetic field; the magnetic field generator 402 and the YIG magneto-optical crystal 302 together form a magneto-optical isolator. In this embodiment, magnetic field generator 402 is an electrically controlled magnetic field generator 402.
The laser beam is used to pump the laser gain medium 301. The laser gain medium 301 is Er3+Or Pr3+An ion activated laser crystal.
The optical polarization element 303 is used to limit the laser light resonated in the cavity to linearly polarized laser light.
The magnetic field generator 402 is also used to modulate the magnetic field strength to achieve the saturation field of the YIG magneto-optical crystal 302, causing the YIG magneto-optical crystal 302 to produce the faraday magneto-optical effect.
The YIG magneto-optical crystal 302 also serves to deflect the linearly polarized laser light passing through the crystal by 45 °; specifically, by controlling the strength of the magnetic field applied to YIG magneto-optical crystal 302 or the thickness of YIG magneto-optical crystal 302, the single pass linearly polarized laser light passing through the crystal is deflected by 45 °.
The intermediate infrared Q-switched laser also comprises an input mirror 201 and an output mirror 202;
the input mirror 201 is positioned on the side of the laser gain medium 301 away from the YIG magneto-optical crystal 302;
an output mirror 202 is located on the side of the YIG magneto-optical crystal 302 remote from the laser gain medium 301 for emitting the laser beam.
The pumping source 101 is arranged on the side of the input mirror 201 far away from the output mirror 202;
the mid-infrared Q-switched laser further comprises a beam coupling module 401, and the beam coupling module 401 is disposed between the pump source 101 and the input mirror 201 and is used for focusing and coupling the laser beam.
When the intermediate infrared Q-switched laser in embodiment 1 of the invention is used, Er is pumped on the end face of the semiconductor pump laser3+Or Pr3+The ion-activated laser crystal realizes 2.7-3.0 mu m laser oscillation in a laser resonant cavity, and only linear polarization laser is allowed to realize oscillation due to the existence of the optical polarization element 303.
The YIG magneto-optical crystal 302 and the magnetic field generator 402 together form a magneto-optical isolator. When the magnetic field intensity generated by the magnetic field generator 402 is regulated to reach the saturation magnetic field of the YIG magneto-optical crystal 302, the YIG magneto-optical crystal 302 generates a Faraday magneto-optical effect, the thickness of the YIG magneto-optical crystal 302 is designed to enable one-way linearly polarized light in the laser resonant cavity to be deflected by 45 degrees after passing through the YIG magneto-optical crystal 302, the linearly polarized light is reflected at the output mirror 202 and then passes through the YIG magneto-optical crystal 302 again, due to the nonreciprocity of the Faraday magneto-optical effect, the linearly polarized light is deflected by 45 degrees again, namely, the linearly polarized light rotates by 90 degrees relative to the passing direction of the optical polarization element 303, so that the linearly polarized light cannot pass through the optical polarization element 303 again, the laser oscillation of the laser resonant cavity is in a closed or high-loss state, and the laser cannot realize intermediate infrared laser output; when the magnetic field generator 402 is regulated to generate no magnetic field, the YIG magneto-optical crystal 302 does not generate Faraday magneto-optical effect, the laser oscillation of the laser resonant cavity is in an open or low-loss state, and the laser can realize the output of mid-infrared laser.
The intermediate infrared Q-switched laser of the invention intermittently generates a magnetic field by controlling the magnetic field generator 402, so that the laser resonant cavity is intermittently in a state of high Q value and low Q value. When the laser resonant cavity is in a high Q value state, 2.7-3.0 mu m laser beams generate stimulated amplification in the laser resonant cavity, a large amount of upper energy level particles are consumed, and laser output is realized; when the laser resonant cavity is in a low-Q-value state, due to the combined action of the optical polarization element 303 and the YIG magneto-optical crystal 302, a laser beam can only pass through in a single direction and cannot form laser oscillation, and the laser gain medium 301 can absorb a large amount of pump light energy, so that the number of particles of the upper energy level of the laser is increased rapidly, and the laser resonant cavity is favorable for outputting the laser with high peak power next time.
The intermediate infrared Q-switched laser has a simple structure, is convenient for the mutual matching of all elements, prolongs the service life of the whole device and does not need frequent maintenance.
Example 2
As shown in fig. 2, embodiment 2 of the present invention is different from embodiment 1 in that: the mid-infrared Q-switched laser further comprises an input mirror 201 and an output mirror 202, the pump source 101 is arranged between the input mirror 201 and the optical polarization element 303, the arrangement directions of the laser gain medium 301, the optical polarization element 303 and the YIG magneto-optical crystal 302 are defined as a first direction, and the pump source 101 is arranged around the first direction at the periphery of the laser gain medium 301.
The input mirror 201 is a total reflection mirror for totally reflecting the laser beam emitted from the pump source 101, and the reflected laser beam is parallel to the first direction.
The number of the pump sources 101 is multiple, the pump sources 101 are uniformly distributed on the periphery of the gain medium, and the pump sources 101 are semiconductor pump lasers with output wavelengths of 976 nm.
The laser gain medium 301 is Er3+Or Pr3+An ion activated laser crystal.
When the intermediate infrared Q-switched laser in embodiment 2 of the invention is used, the pump source 101 pumps the Er or Pr activated laser crystal from the side surface of the laser gain medium 301, so as to realize 2.7-3.0 μm laser oscillation in the laser resonant cavity, and only single-pass linearly polarized laser is allowed to realize oscillation due to the existence of the optical polarization element 303.
Although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application.

Claims (7)

1. A mid-infrared Q-switched laser based on YIG magneto-optical crystal is characterized by comprising a pumping source, a laser resonant cavity, a laser gain medium, an optical polarization element, a YIG magneto-optical crystal and a magnetic field generator;
the pump source is used for generating a laser beam;
the laser gain medium, the optical polarization element and the YIG magneto-optical crystal are sequentially arranged in the laser resonant cavity along the transmission direction of the laser beam;
the magnetic field generator is arranged at the periphery of the optical path of the YIG magneto-optical crystal and used for generating a magnetic field; the magnetic field generator and the YIG magneto-optical crystal jointly form a magneto-optical isolator;
the laser beam is used for pumping the laser gain medium;
the optical polarization element is used for limiting laser of the intracavity resonance to be linearly polarized laser;
the magnetic field generator is also used for regulating and controlling the magnetic field intensity, so that the YIG magneto-optical crystal generates a Faraday magneto-optical effect;
the YIG magneto-optical crystal is also used to deflect the linearly polarized laser light through the crystal in a single pass through 45 deg..
2. The mid-infrared Q-switched laser as claimed in claim 1, wherein the linearly polarized laser light passing through the YIG magneto-optical crystal in a single pass is deflected by 45 ° by controlling the strength of the magnetic field applied to the crystal or the thickness of the crystal.
3. The mid-infrared Q-switched laser as claimed in claim 2, wherein the laser gain medium is Er3+Or Pr3+Ion activated laserA photonic crystal.
4. The mid-infrared Q-switched laser as claimed in any of claim 3, further comprising an input mirror and an output mirror;
the input mirror is positioned on one side of the laser gain medium, which is far away from the YIG magneto-optical crystal;
the output mirror is positioned on one side of the YIG magneto-optical crystal, which is far away from the laser gain medium, and is used for emitting laser beams.
5. The mid-infrared Q-switched laser as recited in claim 4, wherein the pump source is disposed on a side of the input mirror remote from the output mirror;
the intermediate infrared Q-switched laser further comprises a light beam coupling module, wherein the light beam coupling module is arranged between the pumping source and the input mirror and used for focusing and coupling the laser beam.
6. The mid-infrared Q-switched laser as claimed in claim 4, wherein the pump source is disposed between the input mirror and the optical polarization element, the arrangement directions of the laser gain medium, the optical polarization element and the YIG magneto-optical crystal define a first direction, and the pump source is disposed around the first direction at the periphery of the laser gain medium;
the input mirror is a total reflection mirror and is used for totally reflecting the laser beam emitted by the pumping source, and the reflected laser beam is parallel to the first direction.
7. The mid-infrared Q-switched laser as claimed in claim 6, wherein the pump sources are plural and are uniformly distributed around the periphery of the gain medium.
CN202111080926.2A 2021-09-15 2021-09-15 Intermediate infrared Q-switched laser based on YIG magneto-optical crystal Pending CN113991412A (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1523550A (en) * 1966-04-22 1968-05-03 Philips Nv Magneto-optical switch
CN102096210A (en) * 2010-11-22 2011-06-15 福建福晶科技股份有限公司 Faraday optoisolator used in wide band
CN102185657A (en) * 2011-04-18 2011-09-14 电子科技大学 Full-optical 3R regeneration device based on magnetically controlled optical fiber parameter oscillator
CN104280823A (en) * 2014-10-09 2015-01-14 华中科技大学 Novel optoisolator based on waveguide structure
CN104733992A (en) * 2015-04-02 2015-06-24 山西大学 High-power inner cavity frequency doubling single-frequency laser device
CN109149351A (en) * 2018-10-16 2019-01-04 中国科学院福建物质结构研究所 Q-switched laser
CN109687266A (en) * 2018-12-19 2019-04-26 山东大学 A kind of 2.79 microns of erbium lasers of high-peak power
CN111830283A (en) * 2020-07-24 2020-10-27 中北大学 Acceleration sensor based on magnetic Faraday optical rotation effect
CN113036587A (en) * 2021-02-07 2021-06-25 中国科学院合肥物质科学研究院 Amplified mid-infrared laser based on erbium-doped single crystal fiber seed light source

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1523550A (en) * 1966-04-22 1968-05-03 Philips Nv Magneto-optical switch
DE1614239A1 (en) * 1966-04-22 1970-07-02 Philips Nv Magneto-optical switch
CN102096210A (en) * 2010-11-22 2011-06-15 福建福晶科技股份有限公司 Faraday optoisolator used in wide band
CN102185657A (en) * 2011-04-18 2011-09-14 电子科技大学 Full-optical 3R regeneration device based on magnetically controlled optical fiber parameter oscillator
CN104280823A (en) * 2014-10-09 2015-01-14 华中科技大学 Novel optoisolator based on waveguide structure
CN104733992A (en) * 2015-04-02 2015-06-24 山西大学 High-power inner cavity frequency doubling single-frequency laser device
CN109149351A (en) * 2018-10-16 2019-01-04 中国科学院福建物质结构研究所 Q-switched laser
CN109687266A (en) * 2018-12-19 2019-04-26 山东大学 A kind of 2.79 microns of erbium lasers of high-peak power
CN111830283A (en) * 2020-07-24 2020-10-27 中北大学 Acceleration sensor based on magnetic Faraday optical rotation effect
CN113036587A (en) * 2021-02-07 2021-06-25 中国科学院合肥物质科学研究院 Amplified mid-infrared laser based on erbium-doped single crystal fiber seed light source

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