CN203339470U - Hollow-core photonic crystal optical fiber and sealed cavity combined type 1.9 [mu]m wavelength converter - Google Patents
Hollow-core photonic crystal optical fiber and sealed cavity combined type 1.9 [mu]m wavelength converter Download PDFInfo
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- CN203339470U CN203339470U CN2013202868202U CN201320286820U CN203339470U CN 203339470 U CN203339470 U CN 203339470U CN 2013202868202 U CN2013202868202 U CN 2013202868202U CN 201320286820 U CN201320286820 U CN 201320286820U CN 203339470 U CN203339470 U CN 203339470U
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Abstract
The utility model relates to a hollow-core photonic crystal optical fiber and sealed cavity combined type 1.9 [mu]m wavelength converter comprising a laser device, a polarization controller, a hydrogen steel cylinder, a sealed cavity, a hollow-core photonic crystal optical fiber, an optical fiber collimator, a lens, an air exhaust opening, an air intake opening, a air circulating pump, a planar mirror and a light beam splitter. The hollow-core photonic crystal optical fiber and sealed cavity combined type 1.9 [mu]m wavelength converter is characterized in that the laser device and the polarization controller form a light source system, the sealed cavity is arranged at the rear part of the light source system in a matching manner, the sealed cavity is connected with the hydrogen steel cylinder provided with a pressure-reducing valve, the hollow-core photonic crystal optical fiber is placed in the sealed cavity, and the incident end face of the optical fiber is connected with the optical fiber collimator; the air exhaust opening and the air intake opening of the sealed cavity are connected with the air circulating pump; the lens, the planar mirror and the light beam splitter are arranged at the rear part of the sealed cavity in a matching manner. According to the hollow-core photonic crystal optical fiber and sealed cavity combined type 1.9 [mu]m wavelength converter, an excellent non-linear characteristic and a mode transmission characteristic of the hollow-core photonic crystal optical fiber are used; pressure intensity adjustability, fluidity and other characteristics of hydrogen in the sealed cavity are used; the hollow-core photonic crystal optical fiber and sealed cavity combined type 1.9 [mu]m wavelength converter is advantaged by low threshold value and high conversion efficiency.
Description
Technical field
The utility model belongs to the photoelectron technology field, is specifically related to a kind of hollow-core photonic crystal fiber and annular seal space composite type 1.9 mum wavelength transducers.
Background technology
The pulsed laser light source that wavelength is 1.9 μ m is widely used in fields such as laser medicine, laser ranging, electrooptical countermeasures, infrared radar, infrared remote sensing and infrared sensings.In medical treatment, laser lithotripsy utilizes moisture in cell to make the moisture vaporization to the strong absorption of 1.9 μ m laser, transfers its energy to calculus, and then calculus is ground into to powder.1.9 the laser of μ m is very shallow to the penetration depth of tissue, the rubble process is very little to the surrounding tissue damage, can reach without wound or Wicresoft's effect.Compare other lithotripsy method, the fail safe of laser lithotripsy is high.High-power 1.9 μ m laser, with its characteristics that vaporization cutting speed is fast, haemostatic effect good, penetrability is little, have unique advantage to diseases such as treatment hyperplasia of prostates.Militarily, the laser of 1.9 μ m has very strong penetration power to air and smog, can be used for the fields such as laser radar and laser ranging.
At present, the pulsed laser light source that obtains 1.9 μ m has many approach, as KTP optical parametric oscillator, the erbium doped fiber laser of semiconductor pumping, the LiNbO of holmium, erbium laser, critical phase matched
3crystal difference frequency and high pressure hydrogen carry out Raman frequency shift etc. to the 1064nm wavelength.And realize that 1.9 μ m Laser outputs the most practical the simplest method is to adopt stimulated Raman scattering (SRS) to realize Raman frequency shift.
SRS is a kind of typical nonlinear optical effect.For gas medium, the SRS threshold power generally, more than the mW magnitude, utilizes conventional method to realize ten minutes difficulties of SRS of gas.Wavelength shifter based on the SRS effect, traditional method is to use gases at high pressure Raman ponds (raman cell) to carry out, system bulk is larger, required pump energy is higher, the operating distance of light wave and gas is short, and energy conversion efficiency is not high, generally only has 20%-30%.The invention of hollow-core photonic crystal fiber (HC-PCF), make realization and the utilization of the nonlinear effect of light and low density gas medium become simple and efficient.HC-PCF has unique hollow structure, can the blanketing gas medium in the fibre core macropore.Light wave is limited in this macropore fibre core, and with the basic mode low-loss transmission, its good basic mode characteristic makes the active area of light and filled media very little.And HC-PCF low-loss transmission characteristic guaranteed longer effective interaction distance, thereby further strengthen nonlinear effect, the interaction strength of light and gas medium can be strengthened to several orders of magnitude.
The Chinese invention patent application " (application number: 200910144236.1 of the optical fiber type tunable gas Raman laser light source based on hollow-core photonic crystal fiber; Publication number: CN 101764350 A) " provide a kind of tunable gas Raman laser light source, the two ends of inside filling the hollow photon crystal of high pressure hydrogen all connect monomode fiber.After its optical fiber two ends welding, the HC-PCF internal pressure is immutable, and conversion efficiency is restricted.This invention is had relatively high expectations to optical fiber fusion welding technology, therefore its cost of manufacture is also higher.
Reported the impact of the variation of pressure in Raman pond on the Raman energy conversion efficiency in " Relation of pump-beam quality and conversion efficiency in the Raman downward conversion ".Along with pressure in chamber increases, the energy conversion efficiency of single order stokes light obviously raises.The scheme of the annular seal space combination that the utility model employing hollow-core photonic crystal fiber and pressure are adjustable, utilize the good nonlinear effect of HC-PCF and mode transfer characteristic, regulate the annular seal space internal pressure by the hydrogen gas cylinder with pressure-reducing valve, gas circulator is taken away the heat of Raman frequency shift process in time, greatly reduce pumping threshold power, improved energy conversion efficiency, the pulse laser of 1064nm to 1.9 μ m the conversion efficiency of pulse laser can reach 35%-45%.
The utility model content
For existing Raman, conversion obtains the not high shortcoming of conversion efficiency of 1.9 μ m LASER Light Source to the utility model, has proposed a kind of annular seal space that hollow-core photonic crystal fiber is adjustable with pressure and has been combined formation hollow-core photonic crystal fiber and annular seal space composite type 1.9 mum wavelength transducers.
The utility model is that the technical scheme that the technical solution problem is taked is:
Hollow-core photonic crystal fiber and annular seal space composite type 1.9 mum wavelength transducers comprise: laser, Polarization Controller, hydrogen gas cylinder, annular seal space, hollow-core photonic crystal fiber, optical fiber collimator, lens, exhaust outlet, air inlet, gas circulator, plane mirror, beam splitter.
At first, hydrogen gas cylinder injects hydrogen and controls its internal pressure to annular seal space, the pump light that laser sends is adjusted its polarization state through Polarization Controller, then enter HC-PCF inside by optical fiber collimator, hydrogen gets up in the effect current downflow of gas circulator, and fully contacts the generation stimulated Raman scattering with incident light, and the Wavelength-converting of generation is through the output of lens focus collimation, under the optical path adjusting of plane mirror, finally by crossing the beam splitter light splitting, obtain 1.9 μ m laser.
Further, described hydrogen gas cylinder is equipped with pressure-reducing valve, and on the one hand, hydrogen gas cylinder, to being filled with hydrogen in annular seal space, provides the excited Raman medium; On the other hand, by the control of pressure-reducing valve, adjust the pressure of hydrogen in annular seal space.
Further, described laser is 1064nm Nd:YAG nanosecoud pulse laser, and carries attenuator, can change fast incident optical power.
Further, described Polarization Controller can conveniently be adjusted the polarization state of incident light, in order to obtain higher Raman gain, also can be used for measuring the impact of polarization state on wavelength conversion efficiency simultaneously.
Further, what described optical fiber collimator adopted is the aspheric surface optical fiber collimator, utilizes its good light collecting light ability, can improve the efficiency that laser coupled enters HC-PCF, light field guided wave mode with basic mode in sufficiently long HC-PCF transmits, and the basic mode loss is very low.
Further, described HC-PCF is fixed on annular seal space inside, and its both ends open facilitates hydrogen to enter the photonic crystal fiber hollow core portion.
Further, the exhaust outlet of described gas circulator is close to optical fiber collimator, and air inlet and exhaust ports are in symmetric position, and its effect is the flow hydrogen gas made in HC-PCF, take away so timely the heat of the generation of Raman frequency shift process, thereby improve the Raman conversion efficiency.
Further, described HC-PCF, optical fiber collimator, lens are positioned on straight line, and be separated with a bit of distance in the middle of optical fiber collimator and HC-PCF, exhaust outlet, the air inlet of guaranteeing gas circulator produce positive and negative pressure at the two ends of photonic crystal fiber respectively, are beneficial to like this hydrogen and flow in the hollow-core photonic crystal fiber inner loop.
What further, described lens used is achromatic micro objective.
Further, the described HC-PCF that fills hydrogen produces stimulated Raman scattering (SRS), and the frequency formula of its scattered light is ω
s=ω
l-ω
qand ω
as=ω
l+ ω
q(ω wherein
lfor the exciting light frequency of laser, ω
qcorresponding optical phonon frequency during for atom or molecular vibration or rotational energy level change, ω
sand ω
asbe respectively stokes light and anti-Stokes light frequency).Using hydrogen as the Raman medium, because its unique filtering characteristic of HC-PCF makes the stokes light of vibration stokes light and high-order, be positioned at outside low loss window, last outgoing be mainly the single order stokes light produced by pure rotation stimulated raman scattering.
The advantage that the utility model has is: adjust the polarization state of incident light by Polarization Controller, improved wavelength conversion efficiency; Light collecting light ability by the aspheric surface collimater raising coupling efficiency that can reduce the wastage; Take away in time the heat of Raman frequency shift process by gas circulator, improved the Raman conversion efficiency; Hydrogen gas cylinder with pressure-reducing valve changes the annular seal space internal pressure, utilizes the good nonlinear characteristic of HC-PCF and mode transfer characteristic to reduce pumping threshold power, has greatly promoted energy conversion efficiency.Low threshold value makes this system more easily and the laser of different capacity coupling is used; High energy conversion efficiency is for high power 1.9 μ m laser surgeys provide possibility in medical treatment, and 1.9 μ m high energy lasers have also promoted the development of the military fields such as laser radar and laser ranging simultaneously.
The accompanying drawing explanation
The hollow-core photonic crystal fiber that Fig. 1 provides for the utility model and the overall structure schematic diagram of annular seal space composite type 1.9 mum wavelength transducers;
Exhaust outlet and optical fiber collimator position view that Fig. 2 is the utility model envelope chamber;
Fig. 3 is the utility model hollow-core photonic crystal fiber and annular seal space (sealed cavity) assembled scheme and conventional Raman pond energy conversion efficiency comparison diagram;
In accompanying drawing, 1. laser, 2. Polarization Controller, 3. hydrogen gas cylinder, 4. annular seal space, 5. hollow-core photonic crystal fiber, 6. optical fiber collimator, 7. lens, 8. exhaust outlet, 9. air inlet, 10. gas circulator, 11. plane mirrors, 12. beam splitters.
Embodiment
Below in conjunction with accompanying drawing, the embodiment that the utility model is provided is described in further detail.
Hollow-core photonic crystal fiber as shown in Figure 1 and annular seal space composite type 1.9 mum wavelength transducers, it comprises that it is that the 5ns energy is lower than the tunable Nd:YAG nanosecoud pulse laser of the power of 330mJ that laser (1) adopts the 1064nm pulsewidth; Polarization Controller (2) is used the polarizer that can adjust arbitrarily polarization state; Optical fiber collimator (6) adopts the aspheric surface optical fiber collimator that focal length is 18mm, and its position faces hollow-core photonic crystal fiber (5); Hydrogen gas cylinder (3) is with pressure-reducing valve, to the hydrogen that is filled with certain pressure intensity in annular seal space (4); Annular seal space (4) is made by stainless steel, can bear 100atm; Hollow-core photonic crystal fiber (5) core diameter is 10 μ m, and length is 2m; Lens (7) adopt the achromatic micro objective of 20 times.
As shown in Figure 2, annular seal space (4) incidence window place, the exhaust outlet (8) of gas circulator (10) is close to optical fiber collimator (6), the position of same air inlet (9) in outgoing end face and exhaust outlet (8) symmetry, optical fiber collimator (6) faces hollow-core photonic crystal fiber (5) incident end face and a bit of distance of being separated by, and the positive and negative pressure that gas circulator (10) produces at exhaust outlet (8) and air inlet (9) so just can make inner the mobile of hydrogen that produce of hollow-core photonic crystal fiber (5).
As shown in Figure 3, the utility model contrasts the energy conversion efficiency of hollow-core photonic crystal fiber and annular seal space assembled scheme and conventional Raman pond, the required pump energy of conventional Raman pond is very high, and pressure in chamber is adjusted to 50atm, and energy conversion efficiency generally only has 20%-30%.Adopt the scheme of the adjustable annular seal space combination of the good HC-PCF of nonlinear effect and mode transfer characteristic and internal pressure only to need 30atm just energy conversion efficiency can be risen to 35%-45%.
The technical problem that the hollow-core photonic crystal fiber that is described in further detail to support the utility model to provide below by the concrete operations principle in the present embodiment and step and annular seal space composite type 1.9 mum wavelength transducers can solve.
The first step:, make laser energy enter smoothly hollow-core photonic crystal fiber (5) by the axle center adjustment of Polarization Controller (2), optical fiber collimator (6), hollow-core photonic crystal fiber (5), lens (7) point-blank.
Second step: first with vacuum pump, drain the interior air of annular seal space (4), re-use hydrogen gas cylinder (3) and inject hydrogen in annular seal space (4), the stable gas pressure in chamber to be sealed (4) is carried out next step operation when 30atm again.
The 3rd step: the 10mJ pulse laser of exporting energy stabilization after 1064nmNd:YAG laser (1) preheating through built-in attenuator adjustment.
The 4th step: in advance Polarization Controller (2) is adjusted to λ/4 polarization places, the laser after laser (1) attenuator is adjusted changes circularly polarized light into through Polarization Controller (2).
The 5th step: aspheric surface optical fiber collimator (6) has optical field distribution adjustment capability flexibly, and laser low-loss after aspheric surface optical fiber collimator (6) is coupled into the guided wave mode with basic mode in hollow-core photonic crystal fiber (5) and is transmitted.
The 6th step: in transmitting procedure, gas circulator (10) circulates hollow-core photonic crystal fiber (5) internal hydrogen, taken away timely the heat of Raman frequency shift process, after laser and hollow-core photonic crystal fiber (5) internal hydrogen fully contact and produce stimulated Raman scattering like this, final emergent light comprises single order stokes light, second order of Stokes light and pump light, its wavelength is 1907nm, 9186nm, 1064nm respectively, and wherein the stimulated Raman scattering wavelength be take single order stokes light 1907nm as main.
The 7th step: emergent light, through the output of lens (7) focussed collimated, obtains finally by crossing beam splitter (12) pulse laser that wavelength is 1907nm, and the output energy is about 4mJ, and its energy conversion efficiency can reach 40%.
Claims (6)
1. hollow-core photonic crystal fiber and annular seal space composite type 1.9 mum wavelength transducers, comprise laser (1), Polarization Controller (2), hydrogen gas cylinder (3), annular seal space (4), hollow-core photonic crystal fiber (5), optical fiber collimator (6), lens (7), exhaust outlet (8), air inlet (9), gas circulator (10), plane mirror (11), beam splitter (12), it is characterized in that laser (1) and Polarization Controller (2) form light-source system, the light-source system rear portion is equipped with annular seal space (4), annular seal space (4) is connected with the hydrogen gas cylinder (3) with pressure-reducing valve, the inner hollow-core photonic crystal fiber (5) of placing of annular seal space (4), the incident end face of optical fiber is connected with optical fiber collimator (6), the exhaust outlet (8) of annular seal space (4), air inlet (9) is connected with gas circulator (10), finally sealed chamber (4) rear positions is equipped with lens (7), plane mirror (11) and beam splitter (12).
2. hollow-core photonic crystal fiber according to claim 1 and annular seal space composite type 1.9 mum wavelength transducers, it is characterized in that: described laser (1) is 1064nm Nd:YAG nanosecoud pulse laser, and carries attenuator.
3. hollow-core photonic crystal fiber according to claim 1 and annular seal space composite type 1.9 mum wavelength transducers is characterized in that: described annular seal space (4) adopts stainless steel to make, and can bear 100atm.
4. hollow-core photonic crystal fiber according to claim 1 and annular seal space composite type 1.9 mum wavelength transducers, it is characterized in that: described hollow-core photonic crystal fiber (5) is placed in annular seal space (4) inside that is full of high pressure hydrogen, and the hollow core portion of photonic crystal fiber also is full of high pressure hydrogen.
5. hollow-core photonic crystal fiber according to claim 1 and annular seal space composite type 1.9 mum wavelength transducers is characterized in that: described optical fiber collimator (6) adopts the non-spherical lens with light collecting light ability.
6. hollow-core photonic crystal fiber according to claim 1 and annular seal space composite type 1.9 mum wavelength transducers, it is characterized in that: the exhaust outlet of described gas circulator (8) is in the position of annular seal space (4) near optical fiber collimator (6), and air inlet (9) and exhaust outlet (8) are in symmetric position.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202868202U CN203339470U (en) | 2013-05-22 | 2013-05-22 | Hollow-core photonic crystal optical fiber and sealed cavity combined type 1.9 [mu]m wavelength converter |
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|---|---|---|---|
| CN2013202868202U CN203339470U (en) | 2013-05-22 | 2013-05-22 | Hollow-core photonic crystal optical fiber and sealed cavity combined type 1.9 [mu]m wavelength converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076505A (en) * | 2014-07-23 | 2014-10-01 | 中国计量学院 | Polarization controller based on hollow pohotonic crystal fiber |
| CN104184042A (en) * | 2013-05-22 | 2014-12-03 | 中国计量学院 | Combined 1.9 mu m wavelength converter of hollow-core photonic crystal fiber and seal cavity |
| CN107884382A (en) * | 2017-10-13 | 2018-04-06 | 北京工业大学 | A kind of gas detecting system based on hollow antiresonance optical fiber |
-
2013
- 2013-05-22 CN CN2013202868202U patent/CN203339470U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184042A (en) * | 2013-05-22 | 2014-12-03 | 中国计量学院 | Combined 1.9 mu m wavelength converter of hollow-core photonic crystal fiber and seal cavity |
| CN104184042B (en) * | 2013-05-22 | 2017-06-09 | 中国计量学院 | A kind of hollow-core photonic crystal fiber and the mum wavelength converter of annular seal space combined type 1.9 |
| CN104076505A (en) * | 2014-07-23 | 2014-10-01 | 中国计量学院 | Polarization controller based on hollow pohotonic crystal fiber |
| CN107884382A (en) * | 2017-10-13 | 2018-04-06 | 北京工业大学 | A kind of gas detecting system based on hollow antiresonance optical fiber |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131211 Termination date: 20140522 |