CN113644537A - Device for controlling broadband laser output energy - Google Patents
Device for controlling broadband laser output energy Download PDFInfo
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- CN113644537A CN113644537A CN202110754663.2A CN202110754663A CN113644537A CN 113644537 A CN113644537 A CN 113644537A CN 202110754663 A CN202110754663 A CN 202110754663A CN 113644537 A CN113644537 A CN 113644537A
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- broadband
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- 230000010287 polarization Effects 0.000 claims abstract description 47
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000008033 biological extinction Effects 0.000 claims description 2
- 230000003595 spectral effect Effects 0.000 abstract description 2
- 238000001228 spectrum Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 5
- 238000005388 cross polarization Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 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
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Classifications
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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
- H01S3/10061—Polarization control
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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
- H01S3/121—Q-switching using intracavity mechanical devices
- H01S3/125—Q-switching using intracavity mechanical devices using rotating prisms
Abstract
A device for controlling broadband laser output energy comprises at least two broadband orthogonal polarization beam splitting prisms (or granny-type polarization prisms such as broadband polarized lenses, Rochon polarization prisms, and the like), at least one of which can rotate in a direction orthogonal to the laser transmission direction. The energy of the output laser is continuously changed by rotating the rotation angle of the front and rear stage broadband polarizing elements, the emergent beam of the device is linearly polarized, and the polarization angle of the emergent beam is determined by the rotation position of the final stage broadband polarizing element. The device can accurately control the output laser energy and the polarization direction without changing the spectral structure of the output broadband laser, and the ratio of the highest energy to the lowest energy of the output laser of the device is higher than (>105) And the device can obtain higher output energy ratio by continuously connecting a rotatable broadband orthogonal polarizing prism or a polarizing lens in series, and can be widely used in occasions needing accurate control of output energy in a broad-spectrum light path.
Description
Technical Field
The invention relates to a device for controlling broadband laser output energy, wherein the incident laser of the device can be wide-spectrum laser, the laser emitted by the device is broadband linearly polarized light with the polarization direction capable of being set randomly, the output laser energy can be adjusted continuously, the spectrum is not distorted along with the energy change, the ratio of the highest output laser energy to the lowest output laser energy of the output laser is more than 105: the device can realize accurate control of broadband laser output energy.
Background
In a conventional narrow-band laser system, a common way of continuously controlling output light intensity is a half-wave plate + polarizing lens, while in a wide-spectrum system of ultrashort pulse laser, the conventional half-wave plate + polarizing plate has a disadvantage that, because a glass cannot strictly correspond to continuous wavelengths in all broadband ranges, a broadband laser spectrum output by the glass is modulated, and simultaneously, the lowest and highest output energy ratios of the glass are increasingly attenuated along with the increase of bandwidth, for example, when 1053nm central wavelength laser is used in engineering, under the condition that the bandwidth is 10nm, the highest and lowest output energy ratios are less than 300: 1 (in the narrow band, this index is greater than 105: 1) moreover, this problem is exacerbated for wider spectral ranges.
Disclosure of Invention
The invention provides a device for controlling broadband laser output energy. By utilizing the characteristic that the polarization coating film can have wide-spectrum consistency, the precise attenuation of the broadband laser energy is realized in the invention in a mode of combining two (or more) rotating broadband orthogonal polarizing prisms (or a broadband polaroid, a Rochon polarizing prism and the like), the output laser spectrum is not influenced, and the highest and minimum output energy proportion also reaches and exceeds the attenuation index of the narrow-band laser. The mode can replace the original narrow-band (half-wave plate + polaroid) energy control mode in a broadband engineering device.
The technical solution of the invention is as follows:
a device suitable for controlling broadband laser output energy is characterized in that: the broadband orthogonal polarization beam splitter prism (or broadband polarization lens) can rotate along the input direction of the broadband laser, the rotation position of the later broadband orthogonal polarization beam splitter prism (or broadband polarization lens) determines the output line polarization direction of the emergent laser, and the different rotation positions of the former broadband orthogonal polarization beam splitter prism (or broadband polarization lens) can continuously change the energy of the final output laser.
The device can realize continuous adjustment of the output energy, has the characteristics of high ratio of highest to lowest output energy and no change of the distribution of the output light spectrum, can be widely applied to occasions needing accurate control of the output energy in a broad-spectrum light path, and can be widely applied to ultrashort pulse laser systems and other broad-spectrum light path needing accurate control of the output energy.
The invention has the technical effects that:
1) the device of the invention can realize large-range high-precision continuous adjustment of broadband laser output energy, and the ratio of the output lowest energy to the output highest energy is more than 1: 105(ii) a (the scale is increased by orders of magnitude as the number of broadband orthogonal polarization splitting prisms is increased).
2) The device rotating device is added with a remote control function, so that the device can be remotely and accurately controlled, and the output of the device can be intelligently managed by matching with a measurement and feedback unit of the system.
3) By calibrating the curve of the rotation angle and the output energy, the energy accurate output with higher minimum and maximum energy ratio can be obtained in a serial mode.
4) The device can be widely applied to ultrashort pulse laser engineering devices and other broadband light source systems, and particularly can completely replace the original modes of an attenuator, a half-wave plate and a polaroid for a broadband measuring unit.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment 1 of the apparatus for controlling broadband laser output energy according to the present invention;
FIG. 2 is a plot of the minimum energy to maximum energy ratio versus the actual test of the present invention;
FIG. 3 is a graph of output spectra at different energies for practical testing of the present invention;
FIG. 4 is a schematic diagram of a three (or more) broadband cross-polarization beam splitter prisms of the present invention controlling the output energy;
FIG. 5 is a schematic diagram of a three (or more) broadband polarizing elements according to the present invention for controlling output energy.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1: broadband laser remote energy adjusting device
Fig. 1 is a schematic structural diagram of an embodiment of the device for controlling broadband laser output energy according to the present invention, and as shown in the figure, the device for controlling broadband laser output energy comprises two broadband polarizing elements disposed in sequence along an optical axis, which are respectively a first rotatable incident broadband orthogonal polarizing beam splitter prism 1 and a second rotatable (or non-rotatable) emergent broadband orthogonal polarizing beam splitter prism 2, since the polarization state of the laser to be output by the system is P-polarized output, the position of the second rotatable (or non-rotatable) emergent broadband orthogonal polarizing beam splitter prism 2 rotates to the position where the polarization state of the transmitted light is P-polarized, the initial polarization state of the broadband laser input is P-polarized, when the rotation angle of the broadband orthogonal polarizing beam splitter prism 1 is changed by a remote control rotation motor 3, the incident laser is split into two beams with mutually perpendicular polarization directions in the incident broadband orthogonal polarizing beam splitter prism 1, the output energy of the transmitted beam and the polarization direction of the output light change along with the change of the rotation angle, when the rotating azimuth angle is P light transmission is maximum, the polarization direction of the light entering the broadband orthogonal polarization beam splitter prism 2 is also P polarization, and the output energy is in the maximum output state; when the first broadband cross polarization beam splitter prism 1 rotates 900In this case, the polarization state of the laser beam transmitted through the 1 is S-polarized with respect to the second broadband orthogonal polarization beam splitter prism, and the output laser beam energy is the minimum energy output when the laser beam transmits through the second broadband orthogonal polarization beam splitter prism 2. The extinction ratio of the broadband orthogonal polarization beam splitter prism is 1: 500, a step of; theoretically, after passing through the pair of rotating broadband orthogonal polarization beam splitting prisms, the ratio of the minimum output energy to the maximum output energy is 1: 250000, actual measurements are shown in fig. 2, with a minimum to maximum energy ratio of 1: 105It should be noted that the minimum energy value measured by us exceeds the minimum energy detectable, and the ratio of the minimum energy to the maximum energy can be adjusted to be more than 1: 105In (1).
The dashed line in fig. 2 is the plot of the minimum and maximum energy ratio of the output adjusted by way of zero-order half waveplate + polarizer versus half waveplate rotation angle. It can be seen from the figure that in this way, the minimum to maximum energy ratio can be practically adjusted to be less than 1: 300. it can be seen from the data in fig. 2 that the minimum to maximum energy ratio is greatly improved by rotating the broadband orthogonal polarizing beam splitting prism.
Fig. 3 is a spectrum output curve of the broadband laser light under different output energies after passing through the energy adjusting device, and it can be seen from the graph that the spectrum shapes and spectrum widths of the broadband laser light are kept consistent corresponding to the different output energies, and it is also illustrated that the distribution of the output light spectrum is not affected when the output laser energy is changed by the device.
EXAMPLE 2 adjusting device for controlling output laser energy by three (or more) broadband polarizing elements
Fig. 4 is a schematic structural diagram of embodiment 2 of the apparatus for controlling laser energy by three (or more) rotating broadband polarizing elements according to the present invention. The device comprises a rotatable incident broadband orthogonal polarization beam splitter prism 1, a rotatable emergent broadband orthogonal polarization beam splitter prism 2 and a rotatable broadband orthogonal polarization beam splitter prism 6, wherein if the initial polarization state of broadband laser input is p polarization, the highest output energy ratio to the minimum output energy ratio of output light is more than 108. If a higher energy control range is needed, more rotating broadband orthogonal polarization splitting prisms (or polarizers) need to be connected in series. FIG. 5 shows a rotating broadband polarizer 7 instead of the broadband cross polarization beam splitter prism 6 of FIG. 4, which has the same effect as FIG. 4Therefore, replacing the corresponding polarization element with a grange-type polarization prism (one of the two output polarization beams does not change the transmission direction along with the rotation of the crystal) such as Rochon polarization prism has the same effect.
The invention can solve the problem of energy accurate control in the broadband laser device by rotating the combination of the broadband polarizing prisms, can ensure that the output laser spectrum is not distorted, and can accurately regulate and control the output laser energy in various broadband light paths by connecting a plurality of units in series.
It should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An apparatus for controlling broadband laser output energy, comprising: the broadband polarization device comprises at least two broadband polarization elements which are sequentially arranged along an optical axis, and at least one broadband polarization element at an incident end can rotate along the orthogonal direction of the optical axis; one of the two polarized beams output by all the broadband polarizing elements does not change the transmission direction along with the rotation of the polarizing prism.
2. The apparatus of claim 1, wherein: the broadband polarizing element is a broadband orthogonal polarization beam splitter prism, a broadband polarizing lens or a Rochon polarizing prism.
3. The apparatus of claim 1, wherein: the broadband polarization element orthogonally rotates relative to the transmission direction of the broadband laser beam of which the energy output is to be changed.
4. The apparatus of claim 1, wherein: the broadband polarizing element has an extinction ratio of p-polarized light to s-polarized light within a bandwidth range of more than 500: 1.
5. an apparatus for controlling broadband laser output energy according to claim 2, wherein: when the incident laser is any polarized light, the energy of the output laser is continuously changed by rotating the angle of the front and rear broadband orthogonal polarization beam splitter prisms or the broadband polarizing lens, and the polarization direction of the emergent linearly polarized light is determined by the rotating position of the rear broadband orthogonal polarization beam splitter prism or the broadband polarizing lens.
6. An apparatus for controlling the output energy of a broadband laser as claimed in claim 1, wherein the output requirement is higher for the output of the ratio of minimum energy to maximum energy, e.g. for>105Three or even a plurality of broadband polarization elements are connected in series to realize the output energy ratio required by higher orders of magnitude.
7. An apparatus for controlling broadband laser output energy according to claim 1, wherein the rotatable broadband polarizing element is implemented manually.
8. An apparatus for controlling broadband laser output energy according to claim 1, wherein the rotatable broadband polarizing element is implemented by a stepper motor.
9. The device for controlling broadband laser output energy according to claim 1, wherein the device is capable of remotely controlling the operation of the stepping motor through a computer and a mobile terminal by adopting WIFI, Bluetooth and infrared wireless communication modes, and automatically and remotely and accurately adjusting the output energy by matching with an energy measuring unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110754663.2A CN113644537A (en) | 2021-07-02 | 2021-07-02 | Device for controlling broadband laser output energy |
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| CN202110754663.2A CN113644537A (en) | 2021-07-02 | 2021-07-02 | Device for controlling broadband laser output energy |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938973A (en) * | 2016-06-21 | 2016-09-14 | 沈阳理工大学 | Novel high-precision laser energy/power attenuator |
| CN206833168U (en) * | 2017-05-22 | 2018-01-02 | 中国科学院国家授时中心 | Collimator and extender spot diameter converting means |
| CN111897136A (en) * | 2020-08-13 | 2020-11-06 | 中国科学院长春光学精密机械与物理研究所 | Dynamic continuous attenuation device for mid-infrared laser |
| CN112968341A (en) * | 2021-02-01 | 2021-06-15 | 中国科学院上海光学精密机械研究所 | Energy attenuation device for broadband ultrashort laser |
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2021
- 2021-07-02 CN CN202110754663.2A patent/CN113644537A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105938973A (en) * | 2016-06-21 | 2016-09-14 | 沈阳理工大学 | Novel high-precision laser energy/power attenuator |
| CN206833168U (en) * | 2017-05-22 | 2018-01-02 | 中国科学院国家授时中心 | Collimator and extender spot diameter converting means |
| CN111897136A (en) * | 2020-08-13 | 2020-11-06 | 中国科学院长春光学精密机械与物理研究所 | Dynamic continuous attenuation device for mid-infrared laser |
| CN112968341A (en) * | 2021-02-01 | 2021-06-15 | 中国科学院上海光学精密机械研究所 | Energy attenuation device for broadband ultrashort laser |
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Application publication date: 20211112 |
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