CN201251670Y - Device for increasing laser signal-to-noise ratio - Google Patents
Device for increasing laser signal-to-noise ratio Download PDFInfo
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- CN201251670Y CN201251670Y CNU2008201514144U CN200820151414U CN201251670Y CN 201251670 Y CN201251670 Y CN 201251670Y CN U2008201514144 U CNU2008201514144 U CN U2008201514144U CN 200820151414 U CN200820151414 U CN 200820151414U CN 201251670 Y CN201251670 Y CN 201251670Y
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- polarization controller
- noise ratio
- ratio
- laser signal
- polarizer
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Abstract
A device for increasing laser signal-to-noise ratio is formed by a first polarization controller, a polarizer and a beam splitter with 1*2 port, which are fixed in turn along the beam forward direction, wherein the incident beam is divided into two beams after passing through the beam splitter with 1*2 port, wherein one beam is monitored, and the other beam is output after passing through non-linear birefringence medium, a second polarization controller and an analyzer. The device for increasing laser signal-to-noise ratio has the characteristics of simple regulation, compact structure, increased signal-to-noise ratio 104 and all-fiber laser realization.
Description
Technical field
The utility model relates to laser, particularly a kind of device that improves the laser signal to noise ratio (S/N ratio), and its advantage is to regulate simply, compact conformation, the efficient height, the pulse signal to noise ratio (S/N ratio) can improve 10
4More than, can realize full fiberize.
Background technology
The laser signal to noise ratio (S/N ratio) is an important parameter of high power laser system, and it has material impact to the reliability and the accuracy of total system.In high-intensity laser operation and amplifying, there is multiple factor can introduce the noise spike of laser, such as choosing the small-pulse effect remnants that extinction ratio limited in the monopulse process can cause pulse train, the spontaneous radiation amplification that produces in the laser amplification process can be introduced continuous ground unrest.
The method of the raising pulse signal to noise ratio (S/N ratio) that has proposed at present mainly contains spatial filtering, time filtering, ring cavity amplification, optical parameter chirped pulse amplification (OPCPA), two chirped pulse amplification (DCPA) etc.These methods all require the body material to build, and loss is big, complex structure, cost height.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, and a kind of device that improves the laser signal to noise ratio (S/N ratio) is provided, the advantage that require this device to have compact conformation, to reduce coupling loss, cost is low and efficient is high, and the pulse signal to noise ratio (S/N ratio) can improve 10
4More than, can realize full fiberize.
Technical solution of the present utility model is as follows:
A kind of device that improves the laser signal to noise ratio (S/N ratio), characteristics are that its formation comprises: along the incident beam working direction is first Polarization Controller, the polarizer, beam splitter, nonlinear birefringence medium, second Polarization Controller and analyzer successively, described beam splitter is divided into the main beam that sees through and the monitoring light beam of reflection with incident beam, by to the monitoring of this monitoring light beam to obtain the correct adjustment of first Polarization Controller.
The described polarizer and analyzer are to be made of film polaroid, polarizing prism or fibre optic polarizer.
Described first Polarization Controller and second Polarization Controller are half-wave plate, quarter wave plate group or optical-fiber type Polarization Controller.
Described nonlinear birefringence medium is a birefringece crystal, or optical fiber.
Described two Polarization Controllers are used to adjust the polarization state of light beam, the state of two Polarization Controllers meets the following conditions: adjust first Polarization Controller, the B1 light beam of the beam splitter by monitoring 1 * 2 port makes signal pulse be input in the nonlinear birefringence medium by the polarizer with the loss of minimum; Adjust second Polarization Controller, by the monitoring output terminal, make noise light be stopped, and the signal pulse of generation polarization rotation can pass through by analyzer.
Advantage of the present utility model is:
1, the optional optical fiber components of using of each parts of the utility model device can be realized full fiberize, reduces coupling loss, and compact conformation is easy to adjust;
2, adopt Polarization Controller to adjust the polarization of incident light attitude at input end, reduced the loss of signal pulse;
3, select for use the polarizer of wide wavelength coverage, High Extinction Ratio and analyzer to realize that the pulse signal to noise ratio (S/N ratio) greater than 104 promotes.
Description of drawings
Fig. 1 is the structural representation that the utility model improves the device of laser signal to noise ratio (S/N ratio).
Among the figure:
1-Polarization Controller; 2-polarizer; The beam splitter of 3-1 * 2 ports; 4-nonlinear birefringence medium; 5-analyzer; 6-analyzer
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described further, but should limit protection domain of the present utility model with this.
See also Fig. 1 earlier, Fig. 1 is the one-piece construction synoptic diagram that the utility model improves the device of laser signal to noise ratio (S/N ratio).As seen from the figure, the utility model improves the device of laser signal to noise ratio (S/N ratio), and it constitutes: incident beam B is successively through first Polarization Controller 1, and the beam splitter 3 of the polarizer 2,1 * 2 ports is divided into two-beam, a branch of B behind the beam splitter 3 of incident beam B through 1 * 2 port
1As monitoring, another restraints B
2Through nonlinear birefringence medium 4, the second Polarization Controllers 5, analyzer 6 outputs.
Described nonlinear birefringence medium need be chosen suitable length corresponding to the power level of input pulse and the material of nonlinear birefringence medium.
Described first Polarization Controller 1 and second Polarization Controller 5 are used to adjust the polarization state of light beam, the state of first Polarization Controller 1 and second Polarization Controller 5 meets the following conditions: at first adjust first Polarization Controller 1, the B of the beam splitter 3 by monitoring 1 * 2 port
1Light beam makes signal pulse be input in the nonlinear birefringence medium 4 by the polarizer 2 with the loss of minimum; Adjust second Polarization Controller 5 then, by the monitoring output terminal, make noise light be stopped, and the signal pulse of generation polarization rotation can pass through by analyzer 6.
The utility model improves the device embodiment of laser signal to noise ratio (S/N ratio), as shown in Figure 1.Described first Polarization Controller 1, second Polarization Controller 5, the polarizer 2 and analyzer 6 all adopt optical fiber type, and described nonlinear birefringence medium 4 adopts 5.5 meters long general single mode fibers.Test findings is: the light pulse of input peak power 10KW, and noise average power 14.6mW, output terminal obtain to decay to 1/13 pulse signal of former peak value power, and noise average power is reduced to 50nW.The pulse signal to noise ratio (S/N ratio) improves 2 * 10
4More than.
Claims (4)
1, a kind of device that improves the laser signal to noise ratio (S/N ratio), be characterised in that its formation comprises: along the incident beam working direction is first Polarization Controller (1), the polarizer (2), beam splitter (3) nonlinear birefringence medium (4), second Polarization Controller (5) and analyzer (6) successively, described beam splitter (3) is divided into the main beam that sees through and the monitoring light beam of reflection with incident beam, by to the monitoring of this monitoring light beam to obtain the correct adjustment of first Polarization Controller (1).
2, the device of raising laser signal to noise ratio (S/N ratio) according to claim 1 is characterized in that the described polarizer (2) and analyzer (6) are to be made of film polaroid, polarizing prism or fibre optic polarizer.
3, the device of raising laser signal to noise ratio (S/N ratio) according to claim 1 is characterized in that described first Polarization Controller (1) and second Polarization Controller (5) are half-wave plate, quarter wave plate group or optical-fiber type Polarization Controller.
4, the device of raising laser signal to noise ratio (S/N ratio) according to claim 1 is characterized in that described nonlinear birefringence medium (4) is a birefringece crystal, or optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201514144U CN201251670Y (en) | 2008-07-30 | 2008-07-30 | Device for increasing laser signal-to-noise ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201514144U CN201251670Y (en) | 2008-07-30 | 2008-07-30 | Device for increasing laser signal-to-noise ratio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201251670Y true CN201251670Y (en) | 2009-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201514144U Expired - Fee Related CN201251670Y (en) | 2008-07-30 | 2008-07-30 | Device for increasing laser signal-to-noise ratio |
Country Status (1)
| Country | Link |
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| CN (1) | CN201251670Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324735B (en) * | 2008-07-30 | 2010-06-09 | 中国科学院上海光学精密机械研究所 | Apparatus for improving laser signal-noise ratio |
| CN104102064A (en) * | 2014-06-10 | 2014-10-15 | 中国工程物理研究院激光聚变研究中心 | Method for increasing signal-to-noise ratio of high-energy short pulse laser |
-
2008
- 2008-07-30 CN CNU2008201514144U patent/CN201251670Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324735B (en) * | 2008-07-30 | 2010-06-09 | 中国科学院上海光学精密机械研究所 | Apparatus for improving laser signal-noise ratio |
| CN104102064A (en) * | 2014-06-10 | 2014-10-15 | 中国工程物理研究院激光聚变研究中心 | Method for increasing signal-to-noise ratio of high-energy short pulse laser |
| CN104102064B (en) * | 2014-06-10 | 2017-02-01 | 中国工程物理研究院激光聚变研究中心 | Method for increasing signal-to-noise ratio of high-energy short pulse laser |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090603 |