CN204044052U - For measuring the device of cholesteric liquid crystal Random Laser - Google Patents
For measuring the device of cholesteric liquid crystal Random Laser Download PDFInfo
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- CN204044052U CN204044052U CN201420344082.7U CN201420344082U CN204044052U CN 204044052 U CN204044052 U CN 204044052U CN 201420344082 U CN201420344082 U CN 201420344082U CN 204044052 U CN204044052 U CN 204044052U
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- liquid crystal
- laser
- cholesteric liquid
- spectrometer
- measuring
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Abstract
The utility model provides a kind of device for measuring cholesteric liquid crystal Random Laser, comprise laser instrument, half-wave plate, polaroid, quarter-wave plate, polarization spectroscope, attenuator, energy meter, the energy meter that is connected with energy meter popped one's head in, sample holder, narrow slit plate, spectrometer and pop one's head in the spectrometer that described spectrometer is connected by optical fiber, computing machine.Device for measuring cholesteric liquid crystal Random Laser of the present utility model can accurately measure the Random Laser phenomenon of cholesteric liquid crystal, and the cholesteric liquid crystal Random Laser spectral radiance map recorded is more stable, threshold value is obvious.
Description
Technical field
The utility model relates to laser measurement field, particularly relates to a kind of device for measuring cholesteric liquid crystal Random Laser.
Background technology
At home, the research of Random Laser is started late, and mostly concentrate in numerical simulation category, less to its experimental study.Existing some Experimental Researchs carried out the laser emission of nematic phase liquid crystal random, shoot laser is unstable, and threshold property is not obvious especially.In view of this, the utility model improves prior art, gives a kind of device for measuring cholesteric liquid crystal Random Laser, and the cholesteric liquid crystal Random Laser spectral radiance map recorded is more stable, threshold value is obvious.
Utility model content
In view of this, the utility model provides a kind of device for measuring cholesteric liquid crystal Random Laser, comprise laser instrument, half-wave plate, polaroid, quarter-wave plate, polarization spectroscope, attenuator, energy meter, the energy meter that is connected with energy meter popped one's head in, sample holder, narrow slit plate, spectrometer and pop one's head in the spectrometer that described spectrometer is connected by optical fiber, computing machine; The laser that described laser instrument sends, by half-wave plate directive polaroid, is provided with quarter-wave plate, polarization spectroscope after described polaroid in turn, and the road laser that polarization spectroscope separates is popped one's head in by attenuator directive energy meter; Another road laser puts the sample on sample holder equally by the narrow slit directive putting the narrow slit plate on sample holder; Described spectrometer probe measures laser irradiation intensity in described sample edge, and spectrometer probe is connected by optical fiber with spectrometer, and spectrometer is connected on computing machine by data line, and carries out Real-Time Monitoring by described computing machine to radiant light signal and record data.
Described sample and narrow slit plate are that 45° angle is put by described sample holder, and the detection direction of described spectrometer probe is vertical with described narrow slit plate.
The yttrium aluminum garnet pulsed laser of described laser instrument to be wavelength be 532nm.
The pulse width of described laser instrument is 8ns, and frequency is 10Hz.
The wavelength of described half-wave plate is 532nm.
The slit width of described narrow slit plate is adjustable.
Device for measuring cholesteric liquid crystal Random Laser of the present utility model can accurately measure the Random Laser phenomenon of cholesteric liquid crystal, and the cholesteric liquid crystal Random Laser spectral radiance map recorded is more stable, threshold value is obvious.
accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skills, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of the device for measuring cholesteric liquid crystal Random Laser that Fig. 1 provides for the utility model one embodiment.
The optic spectrum line variation diagram of cholesteric liquid crystal sample under different pump energy obtained for the device measuring cholesteric liquid crystal Random Laser that Fig. 2 (a)-(f) provides for adopting the utility model one embodiment.
embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, clear, complete description is carried out to the technical scheme in the utility model embodiment, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of the utility model protection.
The structural representation of the device for measuring cholesteric liquid crystal Random Laser that Fig. 1 provides for the utility model one embodiment, as shown in Figure 1, the sample of the present embodiment adopts dye adulterated cholesteric liquid crystal sample box.Pump light source uses SGR-10 Pulse Nd: YAG laser (Laser), and adopt 532nm frequency multiplication to export light, pulsewidth is 8ns, and repetition frequency is 10Hz.Half-wave plate medium wavelength is 532nm, and effective clear aperature is 18mm.Measuring pump energy uses precision to be the energy meter (Energy meter) of 0.01 μ j.Collect spectrum spectrometer used (SPE) to be resolution be the fiber optic high-resolution spectrometer of 0.13nm.In addition, what A represented is attenuator, and the probe of what Dp represented is energy meter, what D represented is fiber spectrum instrument probe.
In the optical path, with linear polarization, Q is adjustable, frequency-doubled wavelength is yttroalumite pomegranate pulsed laser Nd:YAG (pulse width 8ns, frequency 10Hz) the pumping sample of 532nm.Half-wave plate and polarizer group close the effect serving attenuator (attenuator), by Malus law I=I
0cos
2α (wherein, I
0for incident ray polarized light is strong, I is transmitted light intensity, and α is the angle of incident ray polarized light and polaroid polarised direction) known, the size of adjusting angle α can change the size of I.Therefore, the size of pumping light intensity can be regulated in experiment by the optical axis direction rotating half-wave plate.Because cholesteric liquid crystal has the dichromatic optical characteristics of circular polarization, only select the circularly polarized light that reflection is identical with its helical structure rotation direction, and the circularly polarized light that directly transmission is contrary with its helical structure rotation direction.Therefore quarter-wave plate (wavelength 532nm) in device, its effect is exactly that the linearly polarized light of laser emitting is by obtaining circularly polarized light thereafter.Gained circularly polarized light incides on sample with 45° angle through adjustable slit.Adjustable slit is utilized to regulate the width of excitation band.On sample, formation one is long is the excitation band that L=9mm and width d (from 0.17mm to 0.07mm) are variable.
First pump light passes through the adjustable attenuator be made up of half-wave plate and polaroid (P), then by after quarter-wave plate, via spectroscope, becomes two-beam: a branch ofly enter energy meter (a light beam), for measurement and the compute of pump energy; The pump light (b light beam) of another Shu Zuowei excitation experiment sample.Adjustable slit is similar to the effect of grating, can change the width inciding pump light on laboratory sample, thus can prevent seizure and the display of covering radiation laser because pump light is too strong.Laser beam by adjustable slit with 45° angle incident pump on laboratory sample, on sample formed a length be L=9mm, the excitation band that width d is variable.Catch the Random Laser of measuring radiation in sample box edge with fiber-optical probe, and detector is connected with spectrometer, by calculating, Real-Time Monitoring and data record is carried out to radiant light signal.
In cholesteric liquid crystal solution, liquid crystal molecule is periodic spin arrangement, there is the character of selective reflecting incident light and refractive anisotrop, this special spiral microcell just likely can play the effect of scatterer, thus realizes Random Laser transmitting when not needing catoptron and adding scattering particle in addition.
The liquid crystal cell sample prepared is placed in device as shown in Figure 1, opens laser instrument and carry out optical pumping, regulate the relative position of spectrometer probe and sample box, and by the computing machine be connected with fiber spectrometer, Real-Time Monitoring record is carried out to emission phenomena.All observed at the two ends, edge of liquid crystal cell obviously to swash at random and penetrate phenomenon.
After the spectrogram gathered being carried out corresponding data processing and Origin drawing process, obtain a series of spectrogram.The emission spectrum of (a), (b), (c), (d), (e), (f) dye adulterated cholesteric liquid crystal solution under being presented at different pump energies in Fig. 2.As we can see from the figure along with the increase gradually of pump energy, emergent light spectrum energy also constantly increases, and spectrum has the phenomenon that significantly narrows.Under lower pump energy, outgoing optic spectrum line is wider, is typical spontaneous radiation curve.Improve pump energy gradually, optic spectrum line narrows, and engenders the emission peak of multiple separation.
Last it is noted that above embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or equivalent replacement is carried out to wherein portion of techniques feature, and these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (6)
1. one kind for measuring the device of cholesteric liquid crystal Random Laser, comprise laser instrument, half-wave plate, polaroid, quarter-wave plate, polarization spectroscope, attenuator, energy meter, the energy meter be connected with energy meter is popped one's head in, sample holder, narrow slit plate, spectrometer, and pop one's head in the spectrometer that described spectrometer is connected by optical fiber, computing machine, it is characterized in that, the laser that described laser instrument sends is by half-wave plate directive polaroid, quarter-wave plate is provided with in turn after described polaroid, polarization spectroscope, the road laser that polarization spectroscope separates is popped one's head in by attenuator directive energy meter, another road laser puts the sample on sample holder equally by the narrow slit directive putting the narrow slit plate on sample holder, described spectrometer probe measures laser irradiation intensity in described sample edge, and spectrometer probe is connected by optical fiber with spectrometer, and spectrometer is connected on computing machine by data line, and carries out Real-Time Monitoring by described computing machine to radiant light signal and record data.
2. a kind of device for measuring cholesteric liquid crystal Random Laser according to claim 1, is characterized in that, described sample and narrow slit plate are that 45° angle is put by described sample holder.
3. a kind of device for measuring cholesteric liquid crystal Random Laser according to claim 2, is characterized in that, the yttrium aluminum garnet pulsed laser of described laser instrument to be wavelength be 532nm.
4. a kind of device for measuring cholesteric liquid crystal Random Laser according to claim 3, is characterized in that, the pulse width of described laser instrument is 8ns, and frequency is 10Hz.
5. a kind of device for measuring cholesteric liquid crystal Random Laser according to claim 4, is characterized in that, the wavelength of described half-wave plate is 532nm.
6. a kind of device for measuring cholesteric liquid crystal Random Laser according to claim 5, is characterized in that, the slit width of described narrow slit plate is adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420344082.7U CN204044052U (en) | 2014-06-18 | 2014-06-18 | For measuring the device of cholesteric liquid crystal Random Laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420344082.7U CN204044052U (en) | 2014-06-18 | 2014-06-18 | For measuring the device of cholesteric liquid crystal Random Laser |
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| CN204044052U true CN204044052U (en) | 2014-12-24 |
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| CN201420344082.7U Expired - Fee Related CN204044052U (en) | 2014-06-18 | 2014-06-18 | For measuring the device of cholesteric liquid crystal Random Laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716553A (en) * | 2015-03-25 | 2015-06-17 | 电子科技大学 | Optical pumping SiO2-Rh6G gel random laser and manufacturing method thereof |
| CN108226055A (en) * | 2018-02-05 | 2018-06-29 | 暨南大学 | A kind of optical fiber sensor head and preparation method and its organic gas fibre-optical sensing device |
-
2014
- 2014-06-18 CN CN201420344082.7U patent/CN204044052U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716553A (en) * | 2015-03-25 | 2015-06-17 | 电子科技大学 | Optical pumping SiO2-Rh6G gel random laser and manufacturing method thereof |
| CN104716553B (en) * | 2015-03-25 | 2018-09-04 | 电子科技大学 | Optical pumping SiO2- Rh6G gel accidental lasers and preparation method thereof |
| CN108226055A (en) * | 2018-02-05 | 2018-06-29 | 暨南大学 | A kind of optical fiber sensor head and preparation method and its organic gas fibre-optical sensing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141224 Termination date: 20150618 |
|
| EXPY | Termination of patent right or utility model |