CN114361926A - Passive Q-switched laser with adjustable pulse generation time - Google Patents
Passive Q-switched laser with adjustable pulse generation time Download PDFInfo
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- 239000013078 crystal Substances 0.000 claims abstract description 29
- 230000003287 optical effect Effects 0.000 claims abstract description 22
- 230000008878 coupling Effects 0.000 claims abstract description 21
- 238000010168 coupling process Methods 0.000 claims abstract description 21
- 238000005859 coupling reaction Methods 0.000 claims abstract description 21
- 238000007493 shaping process Methods 0.000 claims abstract description 12
- 238000004061 bleaching Methods 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 claims description 9
- 238000004020 luminiscence type Methods 0.000 claims description 8
- 239000010408 film Substances 0.000 claims description 6
- 239000012788 optical film Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 description 2
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- 238000007796 conventional method Methods 0.000 description 1
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- 230000005284 excitation Effects 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
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Abstract
The invention discloses a passive Q-switched laser with adjustable pulse generation time, which comprises a pumping source (1), wherein the pumping source (1) is connected with a pumping source shaping system (2), a first light beam (3) and a second light beam (4) are arranged at the emitting end of the pumping source shaping system (2), and the first light beam (3) sequentially passes through a first coupling optical system (5), a first laser gain medium (6), a spectroscope (7), a passive Q-switched crystal (8) and a first half-transmitting and half-reflecting mirror (9); the second light beam (4) sequentially passes through the up-down translation type reflecting mirror (10), the first reflecting mirror (11), the second coupling optical system (12), the second laser gain medium (13), the second half mirror (14) and the second reflecting mirror (15), and the transmitting end of the second reflecting mirror (15) is matched with the incident end of the spectroscope (7). The invention has the characteristic of being capable of adjusting the pulse generation time.
Description
Technical Field
The invention relates to a passive Q-switched laser, in particular to a passive Q-switched laser with adjustable pulse generation time.
Background
The passive Q-switched laser is a pulse laser for Q-switching the laser by utilizing the nonlinear effect of a crystal, and the Q-switching mechanism of the passive Q-switched laser adopts the saturation effect of the crystal without a complex external excitation structure, so that the structure of the passive Q-switched laser is very simple and compact. However, once the existing passive Q-switched laser is produced, the pulse generation time is not adjustable in the use stage, which limits the application of the passive Q-switched laser in some fields, resulting in limited application range. Therefore, the conventional technique has a problem that the pulse generation time is not adjustable.
Disclosure of Invention
The invention aims to provide a passive Q-switched laser with adjustable pulse generation time. The invention has the characteristic of being capable of adjusting the pulse generation time.
The technical scheme of the invention is as follows: a passive Q-switched laser with adjustable pulse generation time comprises a pumping source, wherein the pumping source is connected with a pumping source shaping system, a first light beam and a second light beam are arranged at the emitting end of the pumping source shaping system, and the first light beam sequentially passes through a first coupling optical system, a first laser gain medium, a spectroscope, a passive Q-switched crystal and a first half-transmitting and half-reflecting mirror; the second light beam sequentially passes through the up-down translation type reflecting mirror, the first reflecting mirror, the second coupling optical system, the second laser gain medium, the second half-transmitting half-reflecting mirror and the second reflecting mirror, and the transmitting end of the second reflecting mirror is matched with the incident end of the spectroscope.
In the passive Q-switched laser with adjustable pulse generation time, a first light beam enters a first laser gain medium through a first coupling optical system to perform pumping luminescence, and light emitted by the first laser gain medium enters a first half-transmitting and half-reflecting mirror after passing through a beam splitter and a passive Q-switched crystal and is reflected.
In the passive Q-switched laser with adjustable pulse generation time, a second light beam is deflected by the upper and lower translation type reflecting mirrors and the first reflecting mirror and then enters a second laser gain medium through the second coupling optical system to perform pumping luminescence, light emitted by the second laser gain medium is emitted after passing through the second half mirror, and emitted laser enters a passive Q-switched crystal through the second reflecting mirror and the beam splitter to perform bleaching.
In the passive Q-switched laser with adjustable pulse generation time, the intensities of the first light beam and the second light beam are adjusted by adjusting the upper position and the lower position of the upper translation type reflecting mirror and the lower translation type reflecting mirror, so that the bleaching degree of the passive Q-switched crystal by the second light beam is changed, and the adjustment of the pulse generation time of laser is realized.
In the passive Q-switched laser with adjustable pulse generation time, incident ends of the first laser gain medium and the second laser gain medium are plated with films for increasing reflection of pump light and totally reflecting oscillation light, and emergent ends of the first laser gain medium and the second laser gain medium are plated with optical films for transmitting oscillation light and reflecting pump light.
In the passive Q-switched laser with adjustable pulse generation time, the beam splitter is a cubic prism coated with a beam splitting film in the middle.
In the passive Q-switched laser with adjustable pulse generation time, two ends of the passive Q-switched crystal are plated with optical films for increasing the transmission of the oscillation light.
In the passive Q-switched laser with adjustable pulse generation time, the first half-mirror and the second half-mirror are both output mirrors for oscillating laser.
In the passive Q-switched laser with adjustable pulse generation time, the first mirror is a plane mirror.
Compared with the prior art, the laser gain control device emits a first light beam and a second light beam from a pumping source and a pumping source shaping system, the first light beam is incident to a first laser gain medium through a first coupling optical system to perform pumping luminescence, and the light emitted by the first laser gain medium is incident to a first half-transmitting and half-reflecting mirror and reflected after passing through a beam splitter and a passive Q-switching crystal; the second light beam is deflected by the up-and-down translation type reflecting mirror and the first reflecting mirror, then enters a second laser gain medium through a second coupling optical system to perform pumping luminescence, the light emitted by the second laser gain medium is emitted after passing through a second half mirror, and the emitted laser enters the passive Q-switched crystal to perform bleaching after passing through the second reflecting mirror and the beam splitter; the passive Q-switched crystal is bleached by the second light beam to a certain extent, so that the passive Q-switched crystal is easily saturated when the first light beam passes through the passive Q-switched crystal, the generation time of output pulses is compressed, and the adjustment of the generation time of the pulses is realized; moreover, the translation formula speculum about can be the translation from top to bottom, thereby through the translation formula speculum about realize intensity between first light beam and the second light beam adjust, adjust the intensity that the proportion is first light beam: the intensity of the second light beam is from 1 to infinity, so that the bleaching degree of the passive Q-switched crystal by the second light beam can be finally changed, and the pulse generation time of the laser can be continuously changed to a certain degree. The invention realizes the variable pulse generation time output of the pulse laser on the premise of ensuring the compact structure of the laser. In summary, the invention has the characteristic of being capable of adjusting the pulse generation time.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The labels in the figures are: 1-pumping source, 2-pumping source shaping system, 3-first beam, 4-second beam, 5-first coupling optical system, 6-first laser gain medium, 7-spectroscope, 8-passive Q-switching crystal, 9-first half mirror, 10-up and down translation type reflector, 11-first reflector, 12-second coupling optical system, 13-second laser gain medium, 14-second half mirror, 15-second reflector.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Examples are given. A passive Q-switched laser with adjustable pulse generation time is formed as shown in figure 1 and comprises a pumping source 1, wherein the pumping source 1 is connected with a pumping source shaping system 2, a first light beam 3 and a second light beam 4 are arranged at the emitting end of the pumping source shaping system 2, and the first light beam 3 sequentially passes through a first coupling optical system 5, a first laser gain medium 6, a spectroscope 7, a passive Q-switched crystal 8 and a first half-transmitting and half-reflecting mirror 9; the second light beam 4 sequentially passes through the up-down translation type reflecting mirror 10, the first reflecting mirror 11, the second coupling optical system 12, the second laser gain medium 13, the second half mirror 14 and the second reflecting mirror 15, and the emitting end of the second reflecting mirror 15 is matched with the incident end of the spectroscope 7.
The first light beam is incident to the first laser gain medium through the first coupling optical system to perform pumping luminescence, and the light emitted by the first laser gain medium is incident to the first half-transmitting and half-reflecting mirror and reflected after passing through the beam splitter and the passive Q-switching crystal.
And a second light beam is deflected by the up-and-down translation type reflecting mirror and the first reflecting mirror and then enters the second laser gain medium through the second coupling optical system to perform pumping luminescence, light emitted by the second laser gain medium is emitted after passing through the second half mirror, and emitted laser enters the passive Q-switched crystal after passing through the second reflecting mirror and the spectroscope to perform bleaching.
The intensity of the first light beam and the intensity of the second light beam are adjusted by adjusting the upper position and the lower position of the upper translation type reflecting mirror and the lower translation type reflecting mirror, so that the bleaching degree of the passive Q-switched crystal by the second light beam is changed, and the pulse generation time of the laser is adjusted.
The incident ends of the first laser gain medium 6 and the second laser gain medium 13 are plated with films for increasing the reflection of the pump light and totally reflecting the oscillation light, and the emergent ends of the first laser gain medium 6 and the second laser gain medium 13 are plated with optical films for transmitting the oscillation light and reflecting the pump light.
The beam splitter 7 is a cube prism with a beam splitting film in the middle, and functions to transmit the first light beam and reflect the second light beam.
And optical films for increasing the transmission of the oscillation light are plated at two ends of the passive Q-switching crystal 8.
The first half mirror 9 and the second half mirror 14 are both output mirrors of oscillating laser.
The first mirror 11 is a plane mirror in order to deflect the second light beam.
The working principle is as follows: light emitted by the pumping source is divided into two beams after passing through the pumping source shaping system, the two beams are divided into a first beam and a second beam, the first beam enters the first laser gain medium through the coupling optical system and is pumped to emit light, and the emitted light enters the first semi-transparent semi-reflective mirror after passing through the beam splitter and the passive Q-switching crystal and is reflected.
And the second light beam is deflected by the up-and-down translation type reflecting mirror and the first reflecting mirror, then enters a second laser gain medium through a second coupling optical system, is pumped to emit light, is emitted after passing through the second semi-transparent semi-reflecting mirror, and is emitted after passing through the second reflecting mirror and the beam splitter, and then enters the passive Q-switched crystal to be bleached.
Because passively transfer Q crystal has carried out bleaching by the second light beam to a certain extent, consequently first light beam process when passively transferring Q crystal, very easy make passively transfer Q crystal reach the saturation, consequently output pulse generates the time and obtains the compression, moreover the translation formula speculum is can be from top to bottom translation, thereby the intensity regulation of first light beam and second light beam through removing the translation formula speculum from top to bottom realization, the regulation proportion is the intensity of first light beam: the intensity of the second light beam is from 1 to infinity, so that the bleaching degree of the passive Q-switched crystal by the second light beam can be finally changed, and the pulse generation time of the laser can be continuously changed to a certain degree.
The pumping light source can be a semiconductor laser or other light sources;
the shaping optical system can collimate the light beam of the pump light source and can also shape the divergence angles in different directions into consistency.
The up-down translation type reflecting mirror is arranged on a track and can be driven by a stepping motor to move up and down, so that the light intensity ratio change between the first light beam and the second light beam is continuously changed.
The coupling optical system can converge the light beam to the incident end surface of the laser gain medium.
Claims (9)
1. A passive Q-switched laser with adjustable pulse generation time is characterized in that: the laser gain control device comprises a pumping source (1), wherein the pumping source (1) is connected with a pumping source shaping system (2), a first light beam (3) and a second light beam (4) are arranged at the emitting end of the pumping source shaping system (2), and the first light beam (3) sequentially passes through a first coupling optical system (5), a first laser gain medium (6), a spectroscope (7), a passive Q-switched crystal (8) and a first half-transmitting half-reflecting mirror (9); the second light beam (4) sequentially passes through the up-down translation type reflecting mirror (10), the first reflecting mirror (11), the second coupling optical system (12), the second laser gain medium (13), the second half mirror (14) and the second reflecting mirror (15), and the transmitting end of the second reflecting mirror (15) is matched with the incident end of the spectroscope (7).
2. A passive Q-switched laser with adjustable pulse generation time according to claim 1, wherein: the first light beam is incident to the first laser gain medium through the first coupling optical system to perform pumping luminescence, and the light emitted by the first laser gain medium is incident to the first half-transmitting and half-reflecting mirror and reflected after passing through the beam splitter and the passive Q-switching crystal.
3. A passive Q-switched laser with adjustable pulse generation time according to claim 1, wherein: and a second light beam is deflected by the up-and-down translation type reflecting mirror and the first reflecting mirror and then enters the second laser gain medium through the second coupling optical system to perform pumping luminescence, light emitted by the second laser gain medium is emitted after passing through the second half mirror, and emitted laser enters the passive Q-switched crystal after passing through the second reflecting mirror and the spectroscope to perform bleaching.
4. A passive Q-switched laser with adjustable pulse generation time according to claim 1, wherein: the intensity of the first light beam and the intensity of the second light beam are adjusted by adjusting the upper position and the lower position of the upper translation type reflecting mirror and the lower translation type reflecting mirror, so that the bleaching degree of the passive Q-switched crystal by the second light beam is changed, and the pulse generation time of the laser is adjusted.
5. A passive Q-switched laser with adjustable pulse generation time according to claim 1, wherein: the incident ends of the first laser gain medium (6) and the second laser gain medium (13) are plated with films which are anti-reflection to pumping light and totally reflective to oscillation light, and the emergent ends of the first laser gain medium (6) and the second laser gain medium (13) are plated with optical films which are transmissive to oscillation light and reflective to pumping light.
6. A passive Q-switched laser with adjustable pulse generation time according to claim 1, wherein: the spectroscope (7) is a cubic prism with a spectroscope film plated in the middle.
7. A passive Q-switched laser with adjustable pulse generation time according to claim 1, wherein: two ends of the passive Q-switched crystal (8) are plated with optical films for increasing the reflection of the oscillation light.
8. A passive Q-switched laser with adjustable pulse generation time according to claim 1, wherein: the first half mirror (9) and the second half mirror (14) are both output mirrors of oscillating laser.
9. A passive Q-switched laser with adjustable pulse generation time according to claim 1, wherein: the first reflector (11) is a plane reflector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210007799.1A CN114361926B (en) | 2022-01-06 | 2022-01-06 | Pulse generation time adjustable passive Q-switched laser |
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| CN202210007799.1A CN114361926B (en) | 2022-01-06 | 2022-01-06 | Pulse generation time adjustable passive Q-switched laser |
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| CN114361926B CN114361926B (en) | 2024-03-19 |
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Citations (8)
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| CN2454952Y (en) * | 2000-12-08 | 2001-10-17 | 中国科学院上海光学精密机械研究所 | Composite laser device for generating double-ten-watt pulse with different pulse widths |
| US20020185474A1 (en) * | 2001-05-09 | 2002-12-12 | Dunsky Corey M. | Micromachining with high-energy, intra-cavity Q-switched CO2 laser pulses |
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2022
- 2022-01-06 CN CN202210007799.1A patent/CN114361926B/en active Active
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