CN110718840A - High-precision tunable all-fiber single-frequency laser - Google Patents
High-precision tunable all-fiber single-frequency laser Download PDFInfo
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- CN110718840A CN110718840A CN201911061249.2A CN201911061249A CN110718840A CN 110718840 A CN110718840 A CN 110718840A CN 201911061249 A CN201911061249 A CN 201911061249A CN 110718840 A CN110718840 A CN 110718840A
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- fiber
- quartz tube
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- grating
- laser
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
-
- 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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/1067—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using pressure or deformation
Abstract
The invention relates to the technical field of fiber laser, in particular to a high-precision tunable all-fiber single-frequency laser, which is characterized in that a laser resonant cavity is provided with a first quartz pipe section, a second quartz pipe section and a third quartz pipe section which are coaxially arranged, wherein a first PZT piezoelectric ceramic ring is arranged between the first quartz pipe section and the second quartz pipe section, a second PZT piezoelectric ceramic ring is arranged between the second quartz pipe section and the third quartz pipe section, a broadband fiber grating is arranged in the first quartz pipe section, a narrowband grating is arranged in the third quartz pipe section, the other end of the narrowband grating penetrates through the second PZT piezoelectric ceramic ring and extends into the second quartz pipe section, a gain fiber penetrates through the first PZT piezoelectric ceramic ring, one end of the gain fiber extends into the first quartz pipe section and is fused with the broadband fiber grating, and the other end of the gain fiber extends into the second quartz pipe section and is fused with the narrowband fiber grating; the laser resonant cavity is fixed on the temperature control circuit module.
Description
The technical field is as follows:
the invention relates to the technical field of fiber laser, in particular to a high-precision tunable all-fiber single-frequency laser.
Background art:
the single-frequency fiber laser is also called single longitudinal mode fiber laser and ultra-narrow linewidth fiber laser, and only one longitudinal mode in a resonant cavity can oscillate, so that compared with a common laser, the single-frequency fiber laser has extremely low linewidth, and therefore, the coherence length is ultra-long. In addition, the single-frequency fiber laser also has the advantages of low cost, compact structure, good beam quality, low noise and the like, and has wide application and good prospect in the fields of laser radar, laser ranging, fiber sensing, medical treatment, spectroscopy and the like.
At present, a common single-frequency fiber laser generally has a wire cavity, an annular cavity or a composite cavity structure, and the tuning of the central wavelength is realized by controlling the stress and temperature parameters of a resonant cavity. However, because the temperature cannot be controlled with high precision, and the resonant cavity fixing structure is made of a plurality of metal materials, the metal has good heat conductivity and certain ductility, so that the resonant cavity fixing structure is greatly influenced by the environmental temperature, has poor tuning repeatability and has low tuning precision.
The invention content is as follows:
aiming at the defects and shortcomings in the prior art, the invention provides a high-precision tunable all-fiber single-frequency laser.
The invention can be achieved by the following measures:
a high-precision tunable all-fiber single-frequency laser is provided with a laser resonant cavity and is characterized in that the laser resonant cavity is provided with a first quartz tube section, a second quartz tube section and a third quartz tube section which are coaxially arranged, wherein a first PZT piezoelectric ceramic ring is arranged between the first quartz tube section and the second quartz tube section, a second PZT piezoelectric ceramic ring is arranged between the second quartz tube section and the third quartz tube section, a broadband fiber grating is arranged in the first quartz tube section, a narrow-band grating is arranged in the third quartz tube section, the other end of the narrow-band grating penetrates through the second PZT piezoelectric ceramic ring and extends into the second quartz tube section, a gain fiber penetrates through the first PZT piezoelectric ceramic ring, one end of the gain fiber extends into the first quartz tube section and is welded with the broadband fiber grating, and the other end of the gain fiber extends into the second quartz tube section and is welded with the narrow-band fiber; the laser resonant cavity is fixed on the temperature control circuit module, the temperature control circuit module adopts a TEC semiconductor refrigeration module, and a polycrystalline mullite aluminum silicate ceramic fiber plate is arranged as a heat insulation plate.
According to the invention, the space around the resonant cavity fixing structure is filled by adopting the high-heat-conduction silica gel sheet in the temperature control circuit module, so that the temperature balance of the resonant cavity fixing structure is ensured
The output end of the narrow-band fiber grating is welded with the c end of a wavelength division multiplexer WDM, the a end of the wavelength division multiplexer WDM is welded with a semiconductor laser, the semiconductor laser adopts a 980nm pump LD, the b end of the wavelength division multiplexer WDM is welded with the input end of a 1550nm isolator, and the output end of the isolator outputs laser signals.
The outer diameter of the quartz tube is 8.3mm, the inner diameter of the quartz tube is 3mm, the outer diameter of the PZT ceramic ring is 8.3mm, the inner diameter of the PZT ceramic ring is 3mm, the driving voltage range is 0-150V, and the maximum free stroke is 2.6 mu m.
The reflectivity of the broadband fiber grating is more than 99.9%, the central wavelength is 1550.1 +/-0.04 nm, the bandwidth of-3 dB is 0.4 +/-0.05 nm, the length is 18-20 mm, and the tail end of the fiber at the suspended end of the grating is cut into an 8-degree inclined plane; the broadband fiber bragg grating is welded with the gain fiber with the high absorption coefficient, the absorption coefficient of the gain fiber is larger than 1dB/cm, and the length of the gain fiber is 10-20 mm; the other end of the gain fiber is welded with the narrow-band fiber grating in a fusion mode, the reflectivity of the narrow-band fiber grating is 55 +/-5%, the central wavelength is 1550.1 +/-0.04 nm, the bandwidth of-3 dB is 0.05 +/-0.01 nm, and the length is 18-20 mm.
According to the invention, the quartz material is used as a fixed structure of the resonant cavity, the heat conductivity of quartz is poorer than that of metal, the thermal expansion coefficient is extremely low, the change of the external environment temperature can be effectively alleviated, the influence of the environment on the resonant cavity is reduced, and the temperature of the resonant cavity is controlled by the temperature control circuit module to the greatest extent; in addition, the Young modulus of quartz is large, the deformation of the quartz itself is extremely small when the optical fiber is stretched, so that the stretching amount of the PZT piezoelectric ceramic ring can be added on the optical fiber to the maximum extent, the tuning precision is high, the long-term stability is good, and the repeatability is high. The invention uses two ring PZT piezoelectric ceramics, one controls the narrow-band fiber grating, the length of the grating can be changed to move the central wavelength; the control gain fiber can change the length of the resonant cavity by changing the length of the gain fiber, so as to change the longitudinal mode interval, thereby realizing high-precision tuning of laser frequency in a certain range; the polycrystalline mullite-alumina silicate ceramic fiber board is adopted as a heat insulation material outside the temperature control circuit module, so that the temperature change of the external environment can be effectively isolated; the space around the resonant cavity fixing structure is filled by adopting a high-heat-conduction silica gel sheet in the module, so that the temperature balance of the resonant cavity fixing structure is ensured; the TEC is controlled by a high-precision driving chip, the temperature difference value is converted into a temperature adjusting power value to be subjected to accurate fine adjustment, and temperature oscillation is avoided.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Reference numerals: the device comprises a broadband fiber grating 1, a narrowband fiber grating 2, a high absorption coefficient gain fiber 3, a first quartz tube section 4, a second quartz tube section 5, a third quartz tube section 6, a first PZT piezoelectric ceramic ring 7, a second PZT piezoelectric ceramic ring 8, a semiconductor laser 9, a wavelength division multiplexer WDM10, an isolator 11 and a temperature control circuit module 12.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a high-precision tunable all-fiber single-frequency laser, which includes a broadband fiber grating 1, a narrowband fiber grating 2, a high absorption coefficient gain fiber 3, a first quartz tube section 4, a second quartz tube section 5, a third quartz tube section 6, a first PZT piezoelectric ceramic ring 7, a second PZT piezoelectric ceramic ring 8, a semiconductor laser 9, a wavelength division multiplexer WDM10, an isolator 11, and a temperature control circuit module 12.
In the invention, the reflectivity of the broadband fiber grating 1 is more than 99.9%, the central wavelength is 1550.1 +/-0.04 nm, the bandwidth of-3 dB is 0.4 +/-0.05 nm, the length is 18-20 mm, and the tail end of the fiber at the suspended end of the grating is cut into an 8-degree inclined plane;
the broadband fiber grating 1 is welded with the gain fiber 3 with high absorption coefficient, the absorption coefficient of the gain fiber 3 is larger than 1dB/cm, and the length of the gain fiber 3 is 10-20 mm.
The other end of the gain fiber is welded with the narrow-band fiber grating in a fusion mode, the reflectivity of the narrow-band fiber grating is 55 +/-5%, the central wavelength is 1550.1 +/-0.04 nm, the bandwidth of-3 dB is 0.05 +/-0.01 nm, and the length is 18-20 mm.
The three quartz tubes are adhered together by two annular PZT piezoelectric ceramic rings by glue and keep coaxial; the laser resonant cavity penetrates through central circular holes of the quartz tube and the PZT piezoelectric ceramic ring, end points on two sides of the narrow-band fiber bragg grating are fixed in the quartz tube by ultraviolet glue, and an end point on one side of the gain fiber 3 close to the wide-band fiber bragg grating is fixed in the quartz tube by ultraviolet glue; the quartz tube had an outer diameter of 8.3mm and an inner diameter of 3 mm. The external diameter of the PZT piezoelectric ceramic ring is 8.3mm, the internal diameter is 3mm, the driving voltage range is 0-150V, and the maximum free stroke is 2.6 mu m.
The output end of the narrow-band fiber grating is welded with the c end of the WDM, the a end of the WDM is welded with the 980nm pump LD, the b end of the WDM is welded with the input end of the 1550nm isolator, and the output end of the isolator outputs laser.
The whole fixed structure composed of the quartz tube and the PZT piezoelectric ceramic ring is fixed on the temperature control circuit module 12.
The temperature control circuit module 12 adopts a polycrystalline mullite-alumina silicate ceramic fiber board as a heat insulation material, and the heat conductivity coefficient is 0.085W/m.K; the space around the fixed structure of the resonant cavity is filled with a high-thermal-conductivity silica gel sheet inside the module, and the thermal conductivity coefficient is 12W/m.K; the module adopts an ultra-small TEC semiconductor refrigeration module, the TEC is controlled to work through a high-precision driving chip, the temperature difference value is converted into a temperature adjusting power value, and the temperature is accurately finely adjusted; the temperature control circuit module can keep the temperature inside the module at 25 ℃ in the environment of-50-70 ℃, and the temperature is accurate to 0.1 ℃.
When the invention is used, pump light is emitted by a 980nm pump LD, is emitted into the resonant cavity after passing through the wavelength division multiplexer WDM, generates laser oscillation in the resonant cavity and is output after passing through the narrow-band fiber grating, the WDM and the isolator. The temperature control circuit module stabilizes the temperature of the resonant cavity at a preset value under the control of the circuit, so that the output laser keeps stable wavelength. At this time, the output laser can be tuned from a certain initial wavelength by adjusting the voltage applied to the PZT piezoelectric ceramic 8. In the tuning process, the PZT piezoelectric ceramic 7 can be properly adjusted, and the output laser can be tuned from another initial wavelength by changing the cavity length and further changing the longitudinal mode interval.
According to the invention, the quartz material is used as a fixed structure of the resonant cavity, the heat conductivity of quartz is poorer than that of metal, the thermal expansion coefficient is extremely low, the change of the external environment temperature can be effectively alleviated, the influence of the environment on the resonant cavity is reduced, and the temperature of the resonant cavity is controlled by the temperature control circuit module to the greatest extent; in addition, the Young modulus of quartz is large, the deformation of the quartz itself is extremely small when the optical fiber is stretched, so that the stretching amount of the PZT piezoelectric ceramic ring can be added on the optical fiber to the maximum extent, the tuning precision is high, the long-term stability is good, and the repeatability is high. The invention uses two ring PZT piezoelectric ceramics, one controls the narrow-band fiber grating, the length of the grating can be changed to move the central wavelength; the control gain fiber can change the length of the resonant cavity by changing the length of the gain fiber, so as to change the longitudinal mode interval, thereby realizing high-precision tuning of laser frequency in a certain range; the polycrystalline mullite-alumina silicate ceramic fiber board is adopted as a heat insulation material outside the temperature control circuit module, so that the temperature change of the external environment can be effectively isolated; the space around the resonant cavity fixing structure is filled by adopting a high-heat-conduction silica gel sheet in the module, so that the temperature balance of the resonant cavity fixing structure is ensured; the TEC is controlled by a high-precision driving chip, the temperature difference value is converted into a temperature adjusting power value to be subjected to accurate fine adjustment, and temperature oscillation is avoided.
Claims (5)
1. A high-precision tunable all-fiber single-frequency laser is provided with a laser resonant cavity and is characterized in that the laser resonant cavity is provided with a first quartz tube section, a second quartz tube section and a third quartz tube section which are coaxially arranged, wherein a first PZT piezoelectric ceramic ring is arranged between the first quartz tube section and the second quartz tube section, a second PZT piezoelectric ceramic ring is arranged between the second quartz tube section and the third quartz tube section, a broadband fiber grating is arranged in the first quartz tube section, a narrow-band grating is arranged in the third quartz tube section, the other end of the narrow-band grating penetrates through the second PZT piezoelectric ceramic ring and extends into the second quartz tube section, a gain fiber penetrates through the first PZT piezoelectric ceramic ring, one end of the gain fiber extends into the first quartz tube section and is welded with the broadband fiber grating, and the other end of the gain fiber extends into the second quartz tube section and is welded with the narrow-band fiber; the laser resonant cavity is fixed on the temperature control circuit module, the temperature control circuit module adopts a TEC semiconductor refrigeration module, and a polycrystalline mullite aluminum silicate ceramic fiber plate is arranged as a heat insulation plate.
2. The tunable all-fiber single-frequency laser of claim 1, wherein the temperature control circuit module is filled with a silicone sheet with high thermal conductivity inside the temperature control circuit module.
3. A high-precision tunable all-fiber single-frequency laser as claimed in claim 1, wherein the output end of said narrow-band fiber grating is welded to the c-terminal of the wavelength division multiplexer WDM, the a-terminal of the wavelength division multiplexer WDM is welded to the semiconductor laser, said semiconductor laser uses 980nm pump LD, the b-terminal of the wavelength division multiplexer WDM is welded to the input end of the 1550nm isolator, and the output end of the isolator outputs the laser signal.
4. The high-precision tunable all-fiber single-frequency laser device as claimed in claim 1, wherein the quartz tubes have an outer diameter of 8.3mm and an inner diameter of 3mm, the PZT ceramic rings have an outer diameter of 8.3mm and an inner diameter of 3mm, a driving voltage range of 0-150V, and a maximum free path of 2.6 μm.
5. The high-precision tunable all-fiber single-frequency laser device as claimed in claim 1, wherein the reflectivity of said broadband fiber grating is greater than 99.9%, the center wavelength is 1550.1 ± 0.04nm, the-3 dB bandwidth is 0.4 ± 0.05nm, the length is 18-20 mm, and the end of the fiber at one end of the suspended grating is cut into an 8 ° slope; the broadband fiber bragg grating is welded with the gain fiber with the high absorption coefficient, the absorption coefficient of the gain fiber is larger than 1dB/cm, and the length of the gain fiber is 10-20 mm; the other end of the gain fiber is welded with the narrow-band fiber grating in a fusion mode, the reflectivity of the narrow-band fiber grating is 55 +/-5%, the central wavelength is 1550.1 +/-0.04 nm, the bandwidth of-3 dB is 0.05 +/-0.01 nm, and the length is 18-20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911061249.2A CN110718840A (en) | 2019-11-01 | 2019-11-01 | High-precision tunable all-fiber single-frequency laser |
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| CN201911061249.2A CN110718840A (en) | 2019-11-01 | 2019-11-01 | High-precision tunable all-fiber single-frequency laser |
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| CN110718840A true CN110718840A (en) | 2020-01-21 |
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| CN201911061249.2A Pending CN110718840A (en) | 2019-11-01 | 2019-11-01 | High-precision tunable all-fiber single-frequency laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094445A (en) * | 2022-01-11 | 2022-02-25 | 武汉锐科光纤激光技术股份有限公司 | Light beam processor |
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| CN103825166A (en) * | 2014-02-12 | 2014-05-28 | 华南理工大学 | High-precision and wide-tunability single-frequency optical fiber laser |
| CN104466636A (en) * | 2014-11-30 | 2015-03-25 | 华南理工大学 | Single-frequency Q-switched pulsed fiber laser |
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| CN105356206A (en) * | 2015-11-18 | 2016-02-24 | 华南理工大学 | Wide-temperature-adaptation-interval single frequency fiber laser |
| CN107946883A (en) * | 2017-12-29 | 2018-04-20 | 横琴东辉科技有限公司 | A kind of single frequency optical fiber laser of width single longitudinal mode temperature range |
| CN108879307A (en) * | 2018-09-19 | 2018-11-23 | 山东大学 | One kind being based on Er:YAG-SiO2The tunable single frequency laser and its working method of optical fiber |
| CN109149343A (en) * | 2018-08-30 | 2019-01-04 | 华南理工大学 | A kind of line width controllable optical fibre laser |
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2019
- 2019-11-01 CN CN201911061249.2A patent/CN110718840A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103825166A (en) * | 2014-02-12 | 2014-05-28 | 华南理工大学 | High-precision and wide-tunability single-frequency optical fiber laser |
| CN104466636A (en) * | 2014-11-30 | 2015-03-25 | 华南理工大学 | Single-frequency Q-switched pulsed fiber laser |
| CN104779516A (en) * | 2015-04-20 | 2015-07-15 | 中国科学院上海光学精密机械研究所 | Intermediate infrared single-frequency optical parametric oscillator |
| CN105356206A (en) * | 2015-11-18 | 2016-02-24 | 华南理工大学 | Wide-temperature-adaptation-interval single frequency fiber laser |
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| CN114094445A (en) * | 2022-01-11 | 2022-02-25 | 武汉锐科光纤激光技术股份有限公司 | Light beam processor |
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