CN114235174A - Device capable of monitoring picosecond laser mode locking pulse in real time - Google Patents
Device capable of monitoring picosecond laser mode locking pulse in real time Download PDFInfo
- Publication number
- CN114235174A CN114235174A CN202111458526.0A CN202111458526A CN114235174A CN 114235174 A CN114235174 A CN 114235174A CN 202111458526 A CN202111458526 A CN 202111458526A CN 114235174 A CN114235174 A CN 114235174A
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- Prior art keywords
- picosecond laser
- isolator
- real time
- photoelectric detector
- mode
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 16
- 239000013307 optical fiber Substances 0.000 claims abstract description 24
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 239000000835 fiber Substances 0.000 claims abstract description 6
- 230000010287 polarization Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005459 micromachining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J11/00—Measuring the characteristics of individual optical pulses or of optical pulse trains
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J2001/4247—Photometry, e.g. photographic exposure meter using electric radiation detectors for testing lamps or other light sources
Abstract
The invention provides a device capable of monitoring picosecond laser mode locking pulse in real time, which comprises an isolator, a photoelectric detector and an oscilloscope, wherein laser output by a picosecond laser is divided into two paths of optical fibers through the isolator for output, one path of optical fiber is connected to the photoelectric detector, and the photoelectric detector is connected to the oscilloscope and used as a monitoring optical path; the other path is used as the main output light path of the picosecond laser. The invention has the beneficial effects that: the invention uses the transmission fiber and the isolator to divide a testing light path from the main light path of the picosecond laser, accesses the photoelectric detector, monitors the mode locking ultrashort pulse waveform of the picosecond laser on the oscilloscope in real time, can know whether the picosecond laser reaches the mode locking condition or not in real time, and has higher efficiency.
Description
Technical Field
The invention relates to picosecond laser, in particular to a device capable of monitoring picosecond laser mode locking pulse in real time.
Background
The picosecond laser has extremely short pulse width and extremely high peak power, has extremely small heat influence during processing, does not have a recast layer, and can realize superfine processing and cold processing. The range of picosecond laser-processable materials is very wide, and the picosecond laser-processable material plays an important role in industrial processing, medical science and aviation. The main mode for realizing picosecond laser output is a passive mode locking technology, and the research on the mode locking technology has important significance for the development of laser micromachining.
The existing picosecond laser judges whether a mode locking condition is met or not through preheating time, the preheating time is long, and the power can not be cut off in the machining process. The equipment needs to be preheated again after being restarted due to faults, and the production efficiency is influenced.
Therefore, how to monitor picosecond laser mode-locking pulses more efficiently is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a device capable of monitoring picosecond laser mode locking pulses in real time.
The invention provides a device capable of monitoring picosecond laser mode locking pulse in real time, which comprises an isolator, a photoelectric detector and an oscilloscope, wherein laser output by a picosecond laser is divided into two paths of optical fibers through the isolator for output, one path of optical fiber is connected to the photoelectric detector, and the photoelectric detector is connected to the oscilloscope and used as a monitoring optical path; the other path is used as the main output light path of the picosecond laser.
As a further improvement of the invention, the isolator adopts a single-mode polarization-maintaining bipolar isolator, the working wavelength of the isolator is the same as the central wavelength of a picosecond laser, the isolation degree is greater than 25dB, and the loss is less than 2 dB.
As a further improvement of the invention, the splitting ratio of the monitoring optical path is less than 5%.
As a further improvement of the present invention, an input end of the isolator is connected to the picosecond laser through a polarization maintaining single mode fiber, and an output end of the isolator is connected to the photodetector through a polarization maintaining single mode fiber.
As a further improvement of the invention, the isolator and the picosecond laser are welded by using a polarization maintaining optical fiber welding machine.
As a further improvement of the invention, the response wavelength range of the photoelectric detector comprises the central wavelength of a picosecond laser, the bandwidth is more than 40MHz, and the analog bandwidth of the oscilloscope is more than 100 MHz.
As a further improvement of the invention, the optical fiber jumper wire at the output end of the isolator is connected with the optical fiber jumper wire at the input end of the photoelectric detector by using an optical fiber flange.
As a further improvement of the invention, a BNC connector is used for connecting the photoelectric detector and the oscilloscope.
The invention has the beneficial effects that: the invention uses the transmission fiber and the isolator to divide a testing light path from the main light path of the picosecond laser, accesses the photoelectric detector, monitors the mode locking ultrashort pulse waveform of the picosecond laser on the oscilloscope in real time, can know whether the picosecond laser reaches the mode locking condition or not in real time, and has higher efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other solutions can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of an apparatus of the present invention capable of real-time monitoring of picosecond laser mode-locked pulses.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.
As shown in fig. 1, an apparatus 200 for real-time monitoring picosecond laser mode-locked pulses includes an isolator 201, a photodetector 202, and an oscilloscope 203.
A transmission optical fiber and an isolator 201 are utilized to divide a testing optical path from a main optical path of the picosecond laser 100, a photoelectric detector 202 is connected, a mode locking ultrashort pulse waveform of the picosecond laser is monitored on an oscilloscope 203 in real time, and whether the picosecond laser reaches a mode locking condition or not can be mastered in real time.
The isolator 201 is a single-mode polarization-maintaining bipolar isolator, the working wavelength of the isolator 201 is the same as the central wavelength of the picosecond laser 100, the isolation degree is greater than 25dB, and the loss is less than 2 dB. The beam splitting ratio of the monitoring optical path is less than 5%. The optical fiber is a polarization-maintaining single-mode optical fiber. The response wavelength range of the photodetector 202 should include the center wavelength of the picosecond laser 100 with a bandwidth greater than 40 MHz. The oscilloscope 203 has an analog bandwidth greater than 100 MHZ.
As shown in fig. 1, laser output by the picosecond laser 100 is divided into two optical fibers via an isolator 201 for output, one optical fiber is connected to a photodetector 202, and the photodetector 202 is connected to an oscilloscope 203 as a real-time monitoring optical path; the other path is used as the main output light path of the laser and is used for various laser processing occasions.
The isolator 201 and the picosecond laser 100 are welded by a polarization maintaining optical fiber welding machine, and the output end of the isolator 201 is an optical fiber jumper. The optical fiber jumper of the isolator 201 is connected with the optical fiber jumper of the photoelectric detector 202 by using an optical fiber flange. The connection between the photodetector 202 and the oscilloscope 203 is made using BNC connectors.
According to the device 200 capable of monitoring picosecond laser mode locking pulses in real time, when the oscilloscope 203 is used, the trigger frequency is adjusted to be the same as the repetition frequency of the picosecond laser 100, and the mode locking pulses of the picosecond laser 100 can be observed by adjusting the horizontal scale and the vertical scale of the oscilloscope 203 to be in proper states. The mode locking pulse is sharp and high, is obviously different from the non-mode locking pulse, can judge whether the picosecond laser 100 is in a mode locking state by naked eyes, and is visual and fast.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. The utility model provides a device that can real-time supervision picosecond laser mode locking pulse which characterized in that: the picosecond laser output laser is divided into two paths of optical fibers through the isolator to be output, one path of optical fiber is connected to the photoelectric detector, and the photoelectric detector is connected to the oscilloscope and used as a monitoring optical path; the other path is used as the main output light path of the picosecond laser.
2. The apparatus of claim 1, wherein said apparatus is configured to monitor picosecond laser mode-locked pulses in real time: the isolator adopts a single-mode polarization-maintaining bipolar isolator, the working wavelength of the isolator is the same as the central wavelength of a picosecond laser, the isolation degree is greater than 25dB, and the loss is less than 2 dB.
3. The apparatus of claim 1, wherein said apparatus is configured to monitor picosecond laser mode-locked pulses in real time: the beam splitting ratio of the monitoring optical path is less than 5%.
4. The apparatus of claim 1, wherein said apparatus is configured to monitor picosecond laser mode-locked pulses in real time: the input end of the isolator is connected with the picosecond laser through a polarization-maintaining single-mode fiber, and the output end of the isolator is connected with the photoelectric detector through the polarization-maintaining single-mode fiber.
5. The apparatus of claim 1, wherein said apparatus is configured to monitor picosecond laser mode-locked pulses in real time: and the isolator and the picosecond laser are welded by using a polarization maintaining optical fiber welding machine.
6. The apparatus of claim 1, wherein said apparatus is configured to monitor picosecond laser mode-locked pulses in real time: the response wavelength range of the photoelectric detector comprises the central wavelength of the picosecond laser, the bandwidth is larger than 40MHz, and the analog bandwidth of the oscilloscope is larger than 100 MHz.
7. The apparatus of claim 1, wherein said apparatus is configured to monitor picosecond laser mode-locked pulses in real time: and the optical fiber jumper wire at the output end of the isolator is connected with the optical fiber jumper wire at the input end of the photoelectric detector by using an optical fiber flange.
8. The apparatus of claim 1, wherein said apparatus is configured to monitor picosecond laser mode-locked pulses in real time: and the photoelectric detector is connected with the oscilloscope by using a BNC connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111458526.0A CN114235174A (en) | 2021-12-01 | 2021-12-01 | Device capable of monitoring picosecond laser mode locking pulse in real time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111458526.0A CN114235174A (en) | 2021-12-01 | 2021-12-01 | Device capable of monitoring picosecond laser mode locking pulse in real time |
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| Publication Number | Publication Date |
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| CN114235174A true CN114235174A (en) | 2022-03-25 |
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| CN202111458526.0A Pending CN114235174A (en) | 2021-12-01 | 2021-12-01 | Device capable of monitoring picosecond laser mode locking pulse in real time |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242022A (en) * | 2014-09-26 | 2014-12-24 | 天津大学 | Real-time monitoring, warning and handling system of mode-locked laser status |
| CN105157856A (en) * | 2015-07-29 | 2015-12-16 | 西北核技术研究所 | Device for utilizing semiconductor refractive index change to measure MeV nuclear radiation pulse time width |
| CN109507684A (en) * | 2018-12-18 | 2019-03-22 | 华中科技大学 | High spatial resolution detection system and detection method based on noise like pulse |
| CN209993863U (en) * | 2019-04-24 | 2020-01-24 | 华南师范大学 | Low-repetition-frequency 1064nm self-mode-locking polarization-maintaining ytterbium-doped fiber laser |
-
2021
- 2021-12-01 CN CN202111458526.0A patent/CN114235174A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242022A (en) * | 2014-09-26 | 2014-12-24 | 天津大学 | Real-time monitoring, warning and handling system of mode-locked laser status |
| CN105157856A (en) * | 2015-07-29 | 2015-12-16 | 西北核技术研究所 | Device for utilizing semiconductor refractive index change to measure MeV nuclear radiation pulse time width |
| CN109507684A (en) * | 2018-12-18 | 2019-03-22 | 华中科技大学 | High spatial resolution detection system and detection method based on noise like pulse |
| CN209993863U (en) * | 2019-04-24 | 2020-01-24 | 华南师范大学 | Low-repetition-frequency 1064nm self-mode-locking polarization-maintaining ytterbium-doped fiber laser |
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