CN117175342A - Seed light failure protection circuit applied to MOPA laser - Google Patents
Seed light failure protection circuit applied to MOPA laser Download PDFInfo
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- CN117175342A CN117175342A CN202311242127.XA CN202311242127A CN117175342A CN 117175342 A CN117175342 A CN 117175342A CN 202311242127 A CN202311242127 A CN 202311242127A CN 117175342 A CN117175342 A CN 117175342A
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- delay module
- seed light
- timing
- pump source
- seed
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- 101100456571 Mus musculus Med12 gene Proteins 0.000 title claims abstract description 24
- 239000013307 optical fiber Substances 0.000 claims description 11
- 238000005086 pumping Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 12
- 238000010586 diagram Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 238000005381 potential energy Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention discloses a seed light failure protection circuit applied to a MOPA laser, which comprises a seed source S1 for generating seed light; a photodetector P1 for detecting an output of the seed light; the output of the photoelectric detector P1 is connected with the delay module U1; a pump source LD1 for generating pump light and outputting to the coupler; the pump source switch K1 is used for controlling energy supply of the pump source LD1, and the delay module U1 is connected with the pump source switch K1. When the seed light suddenly fails, the invention can quickly respond and cut off the energy supply of the laser in time, thereby avoiding the damage of the subsequent optical devices, adjusting the response time according to the parameters of the subsequent optical devices, and simultaneously realizing the protection by only adding a delay module and a switch without extra seed light backup, thereby greatly saving the cost.
Description
Technical Field
The invention relates to the technical field of master oscillator power amplifiers, in particular to a seed light failure protection circuit applied to MOPA lasers.
Background
MOPA chinese translates into a master oscillator power amplifier. In the laser field, MOPA systems are a design model in which a master oscillator generates initial laser pulses and boosts the power of these pulses through a power amplifier.
The working principle of the MOPA laser is that laser energy is input into a gain optical fiber through a pumping source to trigger the population inversion in the gain optical fiber to obtain potential energy, then seed light is emitted into the gain optical fiber to excite energy accumulated by the potential energy, so that a beam of laser pulses is generated, the beam quality of the beam of laser pulses is consistent with that of the seed light, and the seed light can be continuous or pulsed. The pump light and the seed light must cooperate, and for pulsed seed light, the pump source pumps for a period of time, a beam of seed light is required to consume the accumulated energy, while for continuous seed light, pumping and consumption are required. However, if the seed light suddenly fails during operation, the seed light cannot be generated, and if the pump source is still continuously pumping, energy is continuously accumulated in the gain fiber, and when the energy accumulation exceeds the threshold value that the fiber can withstand, the fiber is damaged. Therefore, once the seed light suddenly fails, the pump source must be identified in time and turned off so that the pump source does not continue to output energy into the optical fiber, thereby protecting optical devices such as the optical fiber.
Through searching, the Chinese patent with the publication number of CN101640962A discloses a seed light source device with a protection function and an implementation method, and the adopted scheme is that when the failure of seed light is detected, another standby seed light is started for replacement, and the scheme has the defect of higher cost, because the price of the seed light is higher, a large number of lasers can be used in various applications, the failure of the seed light is a small probability event, if one seed light is added in each laser as a backup, the cost is greatly increased, and the waste is caused. Therefore, how to provide a seed light fail-safe circuit for MOPA lasers is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a seed light failure protection circuit applied to a MOPA laser, which can quickly respond and cut off the energy supply of the laser in time when the seed light suddenly fails, so that the damage of a subsequent optical device is avoided, the response time can be adjusted according to the parameter of the subsequent optical device, and meanwhile, the protection can be realized by only adding a delay module and a switch without additional seed light, thereby greatly saving the cost.
According to the embodiment of the invention, the seed light failure protection circuit applied to the MOPA laser comprises a seed source S1 for generating seed light;
a photodetector P1 for detecting an output of the seed light;
the output of the photoelectric detector P1 is connected with the delay module U1;
a pump source LD1 for generating pump light and outputting to the coupler;
the pump source switch K1 is used for controlling energy supply of the pump source LD1, and the delay module U1 is connected with the pump source switch K1.
Optionally, a photo-detector P1 is integrated in the seed source S1, and is configured to provide a pin for directly outputting a detection result of the photo-detector.
Optionally, a timing threshold is set in the delay module U1, the timing value of the delay module U1 exceeds the timing threshold, and the pump source switch K1 is turned off to stop pumping.
Optionally, when the photodetector P1 continuously operates, it performs:
when the photoelectric detector P1 always outputs continuous signals, the delay module U1 is kept at zero, and the pump light is normally output;
when the signal of the photoelectric detector P1 disappears, the time delay module U1 starts to count, and when the count reaches a count threshold, the pump source switch K1 is turned off.
Optionally, when the photodetector P1 is pulsed, the following steps are performed:
when a pulse is detected, the delay module U1 is cleared, and when the pulse disappears, the delay module U1 starts timing;
before the timing reaches the timing threshold, detecting the pulse signal of the photoelectric detector P1 again, and resetting the timing of the delay module U1;
when the timing reaches the timing threshold, the pulse signal of the photodetector P1 is not detected again, and the pump source switch K1 is turned off.
Optionally, the delay module U1 includes an RC delay circuit, a digital delay module, or other modules that may be used for timing.
Optionally, the counting mode of the delay module U1 includes counting from top to bottom or counting from bottom to top.
Optionally, the count threshold of the delay module U1 depends on the power of the pump light and the tolerance value of the optical fiber.
The beneficial effects of the invention are as follows:
when the seed light suddenly fails, the invention can quickly respond and cut off the energy supply of the laser in time, thereby avoiding the damage of the subsequent optical devices, adjusting the response time according to the parameters of the subsequent optical devices, and simultaneously realizing the protection by only adding a delay module and a switch without extra seed light backup, thereby greatly saving the cost.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
fig. 1 is a schematic diagram of a seed light failure protection circuit applied to a MOPA laser according to the present invention;
FIG. 2 is a timing diagram of a seed light in a continuous mode of a seed light fail safe circuit for a MOPA laser according to the present invention;
fig. 3 is a timing diagram of a seed light in a pulse mode in a seed light fail safe circuit applied to a MOPA laser according to the present invention.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the invention and therefore show only the structures which are relevant to the invention.
Referring to FIG. 1, a seed optical fail-safe circuit for MOPA lasers includes
A seed source S1 for generating seed light;
a photodetector P1 for detecting an output of the seed light;
the output of the photoelectric detector P1 is connected with the delay module U1;
a pump source LD1 for generating pump light and outputting to the coupler;
the pump source switch K1 is used for controlling energy supply of the pump source LD1, and the delay module U1 is connected with the pump source switch K1.
In this embodiment, a photo-detector P1 is integrated in the seed source S1, and is used for providing a pin for directly outputting the detection result of the photo-detector.
Example 1:
a timing threshold is set in the delay module U1, the timing value of the delay module U1 exceeds the timing threshold, and the pump source switch K1 is closed to stop pumping.
The timing of the delay module U1 is cleared whenever the signal from the photodetector P1 is detected, whether continuously or pulsed.
When the photodetector P1 is continuously operated, then the following logic will be executed:
when the photoelectric detector P1 always outputs continuous signals, the delay module U1 is kept at zero, and the pump light is normally output;
once the signal of the photodetector P1 disappears, the delay module U1 starts to count, and turns off the pump switch K1 when the count reaches the count threshold, thereby protecting the optical fiber.
When the photodetector P1 is pulsed, then the following logic will be executed:
when a pulse is detected, the delay module U1 is cleared, and when the pulse disappears, the delay module U1 starts timing;
before the timing reaches the timing threshold, the pulse signal of the photoelectric detector P1 is detected again, the timing of the delay module U1 is cleared, so that the pumping source is always kept in an on state, and energy is normally provided for seed light;
when the timing reaches the timing threshold, the pulse signal of the photoelectric detector P1 is still not detected again, which indicates that the seed light works abnormally, and the pump source switch K1 is closed at the moment, so that the protection of the optical fiber is realized.
Or in another way to understand:
the pump light provides an output for a short period of time whenever the signal of the photodetector P1 is detected, which is the timing threshold of the delay module U1, and if the signal of the photodetector P1 is not timely on, the supply of the pump light is turned off.
With another more popular understanding:
the core of the scheme is that the pumping source is 'continuously-operated' through the seed light signal, and once the seed light signal disappears, the pumping source is also closed.
In this embodiment, the delay module U1 includes an RC delay circuit, a digital delay module, or other modules that may be used for timing.
In this embodiment, the counting mode of the delay module U1 includes counting from top to bottom or from bottom to top.
In this embodiment, the count threshold of the delay module U1 is modifiable, and the count threshold depends on the power of the pump light and the tolerance value of the optical fiber. Even if the failure of the seed light is detected, the pump source switch K1 does not turn off the power input of the seed light. In fact, the seed light has a very low power, neither damaging the circuit nor damaging the optics, so that it does not need to be turned off in particular.
Referring to fig. 2, a timing diagram of the operation of the MOPA protection circuit in continuous mode is shown. The upper coordinates represent the optical signal of the seed light detected by the photodetector, and the lower coordinates represent the energy supply of the pump source. When the signal detected by the photoelectric detector suddenly disappears, the time delay module U1 starts timing; when the timing reaches the delay threshold t, the energy supply of the pump source is turned off to protect the optical fiber.
Referring to fig. 3, a timing diagram of MOPA protection circuit operation in an intra-pulse mode is shown. The upper coordinates represent the optical signal of the seed light detected by the photodetector, and the lower coordinates represent the energy supply of the pump source. It can be seen that when the seed light pulse is normally output, the pulse-to-pulse time interval is less than the delay threshold t; so fail-safe is not triggered; when the pulse is no longer output, the delay module U1 will not detect the pulse signal within the delay threshold t, at which point the energy supply to the pump source is turned off to protect the fiber.
When the seed light suddenly fails, the invention can quickly respond and cut off the energy supply of the laser in time, thereby avoiding the damage of the subsequent optical devices, adjusting the response time according to the parameters of the subsequent optical devices, and simultaneously realizing the protection by only adding a delay module and a switch without extra seed light backup, thereby greatly saving the cost.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (8)
1. A seed light failure protection circuit applied to MOPA lasers is characterized by comprising
A seed source S1 for generating seed light;
a photodetector P1 for detecting an output of the seed light;
the output of the photoelectric detector P1 is connected with the delay module U1;
a pump source LD1 for generating pump light and outputting to the coupler;
the pump source switch K1 is used for controlling energy supply of the pump source LD1, and the delay module U1 is connected with the pump source switch K1.
2. The seed light failure protection circuit for MOPA laser according to claim 1, wherein a photo detector P1 is integrated in the seed source S1, and is used for providing a pin for directly outputting a detection result of the photo detector.
3. The seed light failure protection circuit for MOPA laser according to claim 1, wherein a timing threshold is set in the delay module U1, the timing value of the delay module U1 exceeds the timing threshold, and the pump source switch K1 is turned off to stop pumping.
4. A seed light failure protection circuit applied to MOPA laser according to claim 3, wherein, when the photodetector P1 continuously operates, it performs:
when the photoelectric detector P1 always outputs continuous signals, the delay module U1 is kept at zero, and the pump light is normally output;
when the signal of the photoelectric detector P1 disappears, the time delay module U1 starts to count, and when the count reaches a count threshold, the pump source switch K1 is turned off.
5. A seed light failure protection circuit applied to MOPA laser as claimed in claim 3, wherein, when the photodetector P1 is pulsed, the steps of:
when a pulse is detected, the delay module U1 is cleared, and when the pulse disappears, the delay module U1 starts timing;
before the timing reaches the timing threshold, detecting the pulse signal of the photoelectric detector P1 again, and resetting the timing of the delay module U1;
when the timing reaches the timing threshold, the pulse signal of the photodetector P1 is not detected again, and the pump source switch K1 is turned off.
6. A seed light fail safe circuit for a MOPA laser as defined in claim 1, wherein the delay module U1 comprises an RC delay circuit, a digital delay module or other module that can be used for timing.
7. The seed light fail safe circuit for a MOPA laser of claim 1, wherein the count mode of the delay module U1 includes a count from top to bottom or a count from bottom to top.
8. The seed light failure protection circuit for MOPA laser according to claim 1, wherein the count threshold of the delay module U1 depends on the power of the pump light and the tolerance value of the optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311242127.XA CN117175342A (en) | 2023-09-25 | 2023-09-25 | Seed light failure protection circuit applied to MOPA laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311242127.XA CN117175342A (en) | 2023-09-25 | 2023-09-25 | Seed light failure protection circuit applied to MOPA laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117175342A true CN117175342A (en) | 2023-12-05 |
Family
ID=88929789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311242127.XA Withdrawn CN117175342A (en) | 2023-09-25 | 2023-09-25 | Seed light failure protection circuit applied to MOPA laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117175342A (en) |
-
2023
- 2023-09-25 CN CN202311242127.XA patent/CN117175342A/en not_active Withdrawn
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Application publication date: 20231205 |