CN109449744A - A kind of non-relay long-range large-scale optical fiber hydrophone array Raman amplification system - Google Patents
A kind of non-relay long-range large-scale optical fiber hydrophone array Raman amplification system Download PDFInfo
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- CN109449744A CN109449744A CN201811009829.2A CN201811009829A CN109449744A CN 109449744 A CN109449744 A CN 109449744A CN 201811009829 A CN201811009829 A CN 201811009829A CN 109449744 A CN109449744 A CN 109449744A
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- pump laser
- light
- optical fiber
- hydrophone array
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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
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
-
- 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
- H01S3/06754—Fibre amplifiers
-
- 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
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a kind of non-relay long-range large-scale optical fiber hydrophone array Raman amplification systems, it mainly include Raman amplifiction part in the same direction and reversed Raman amplifiction part, the input pumping light and signal light symport of Raman amplifiction part in the same direction, original optical signal for being advanced into Scale Fiber-Optic Hydrophone Array under is effectively amplified, the input pumping light and signal light reverse transfer of reversed Raman amplifiction part, optical signal for returning to uplink optical fibers hydrophone is effectively amplified, so that the preamplifier of photoreceiver be enable to open work.The present invention is using in the same direction the same as the Raman amplifiction scheme reversely combined, the technologies such as pump wavelength selection, polarization state elimination, power control are breached, effective amplification demand of Scale Fiber-Optic Hydrophone Array remote transmission optical signal, concept feasible can be met, it is practical by verifying.
Description
Technical field
The present invention relates to the fields of Fibre Optical Sensor, and in particular to a kind of non-relay long-range large-scale optical fiber hydrophone array use
Raman amplification system.
Background technique
Fibre optic hydrophone can be effectively detected using optical fiber as the underwater sound sensor of new generation of sensing and transmission medium
Ocean acoustic field information, and the functions such as target acquisition, ocean acoustic field environmental monitoring are realized by complicated Underwater acoustic signal processing.With biography
The Piezoelectric detector system of system is compared, and interference-type hydrophone has high sensitivity, and electromagnetism interference and signal cross-talk ability are strong, is moved
The advantages that state range is big, small in size, light-weight and suitable dress property is good.Importantly, in conjunction with existing Fibre Optical Communication Technology, optical fiber
Hydrophone sets up various underwater optical fibre sensing networks in which can be convenient, thus big to solve Underwater Detection and marine energy exploration etc.
The problem of range applications, provides ideal technological approaches.
The scale of current optical fiber hydrophone array constantly expands, primitive number from it is several hundred rise to it is thousands of, transmission range also by
Step extends to hundreds of kilometer.When hydrophone array and land transmitter and receiver are apart from nearly hundred kilometers, remote light transmission loss is asked
Topic gradually shows.Although current fiber transmission attenuation has reached a very low level, in 1.5um wave band, typical light function
Rate loss is only 0.2dB/km, however when for nearly hundred kilometers of one way, round-trip 200 kilometers, accumulative transmission loss is greater than
40dB is inherently lost considerably beyond hydrophone array.It in the case, is guarantee to hydrophone weak acoustic signal
Detection, it is necessary to the analog optical signal of remote transmission is effectively amplified.Therefore, it is necessary to develop a kind of non-relay long-range big
Scale Scale Fiber-Optic Hydrophone Array Raman amplification system can not only realize effective amplification of analog optical signal, but also underwater without changing
The structure of acoustic array and transmission cable does not increase underwater portion complexity, is that large-scale optical fiber hydrophone array is non-relay remote
The key technology that Cheng Bufang is promoted and applied.
Summary of the invention
It is an object of the invention to overcome the shortcomings of the prior art, and provide a kind of non-relay long-range large-scale optical fiber
Hydrophone array Raman amplification system.
The object of the present invention is achieved by the following technical solutions: this non-relay long-range large-scale optical fiber hydrophone
Array Raman amplification system mainly includes Raman amplifiction part in the same direction and reversed Raman amplifiction part, Raman amplifiction portion in the same direction
The input pumping light and signal light symport divided, the original optical signal for being advanced into Scale Fiber-Optic Hydrophone Array under have
Effect amplification, the input pumping light and signal light reverse transfer of reversed Raman amplifiction part, for being returned to uplink optical fibers hydrophone
Optical signal effectively amplified, so that the preamplifier of photoreceiver be enable to open work.
The Raman amplifiction part in the same direction is mainly by 14xx pump laser A, 14xx pump laser B, 14xx wave band
Wave multiplexer, 14xx and 15xx wavelength division multiplexer, remote single mode optical fiber, transmitter input original signal light, fibre optic hydrophone battle array
Column, control circuit are constituted, and control circuit output drive signal to 14xx pump laser A and 14xx pump laser B, 14xx pumps
Pu laser A and 14xx pump laser B power output light under the driving of driving signal enters in 14xx wave band wave multiplexer,
14xx wave band wave multiplexer multiplex output light enters in 14xx and 15xx wavelength division multiplexer, and transmitter input original signal light also enters
In 14xx and 15xx wavelength division multiplexer, 14xx and 15xx wavelength division multiplexer output light enter in remote single mode optical fiber, at a distance
Single mode optical fiber output light enters in Scale Fiber-Optic Hydrophone Array.
The reversed Raman amplifiction part is mainly pumped by 14xx pump laser A, 14xx pump laser B, 14xx
Laser C, 14xx pump laser D, 14xx wave band light polarization beam combiner A, 14xx wave band light polarization beam combiner B, 14xx wave band
Wave multiplexer, 14xx and 15xx wavelength division multiplexer, photoreceiver, Scale Fiber-Optic Hydrophone Array, remote single mode optical fiber, control circuit structure
At 14xx pump laser A and 14xx pump laser B output light under the output drive signal control of control circuit enters
In 14xx wave band light polarization beam combiner A and depolarized conjunction beam is carried out, 14xx pump laser C and 14xx pump laser D is being controlled
The output drive signal of circuit controls lower output light and enters in 14xx wave band light polarization beam combiner B and carry out depolarized conjunction beam, 14xx
The conjunction beam output light of wave band light polarization beam combiner A and 14xx wave band light polarization beam combiner B enters 14xx wave band wave multiplexer, 14xx
The output of wave band wave multiplexer enters in 14xx and 15xx wavelength division multiplexer, and 14xx enters remote single with the output of 15xx wavelength division multiplexer
Mode fiber, Scale Fiber-Optic Hydrophone Array output enter remote single mode optical fiber, and remote single mode optical fiber output enters 14xx and 15xx
In wavelength division multiplexer, the output of 14xx and 15xx wavelength division multiplexer is amplified into photoreceiver.
14xx pump laser A, 14xx pump laser B wavelength of the Raman amplifiction part in the same direction is different.
Reversed Raman amplifiction part 14xx pump laser A, 14xx pump laser B and 14xx pump laser C,
14xx pump laser D is divided to for two groups of wavelength.
The invention has the benefit that the present invention breaches pump using in the same direction with the Raman amplifiction scheme reversely combined
The technologies such as the selection of Pu optical wavelength, polarization state elimination, power control, realize downlink original signal light and uplink array return signal
Effective amplification of light provides the foundation for the engineering application that large-scale optical fiber hydrophone array is remotely laid；Meet optical fiber water
Effective amplification demand of device array remote transmission optical signal is listened, concept feasible is practical by verifying.
Detailed description of the invention
Fig. 1 is Raman amplifiction partial schematic diagram in the same direction of the invention.
Fig. 2 is reversed Raman amplifiction partial schematic diagram of the invention.
Description of symbols: 14xx pump laser A1,14xx pump laser B2,14xx wave band wave multiplexer 3,14xx with
15xx wavelength division multiplexer 4, remote single mode optical fiber 5, transmitter input original signal light 6, Scale Fiber-Optic Hydrophone Array 7, control electricity
Road 8,14xx pump laser C9,14xx pump laser D10,14xx wave band light polarization beam combiner A11,14xx wave band light polarization
Bundling device B12, photoreceiver 13.
Specific embodiment
Below in conjunction with attached drawing, the present invention will be described in detail:
Embodiment: as shown in the picture, this non-relay long-range large-scale optical fiber hydrophone array Raman amplification system is main
It to include Raman amplifiction part in the same direction and reversed Raman amplifiction part, the input pumping light and letter of the Raman amplifiction part in the same direction
Number light symport, the original optical signal for being advanced into Scale Fiber-Optic Hydrophone Array 7 under are effectively amplified.The reversed drawing
The input pumping light and signal light reverse transfer of graceful amplifier section, the optical signal for being returned to uplink optical fibers hydrophone array 7
Effectively amplified, so that the preamplifier of photoreceiver 13 be enable to open work.
The Raman amplifiction part in the same direction is mainly by 14xx pump laser A1,14xx pump laser B2,14xx wave
Section wave multiplexer 3,14xx and 15xx wavelength division multiplexer 4, remote single mode optical fiber 5, transmitter input original signal light 6, optical fiber water
Device array 7, control circuit 8 is listened to constitute, 8 output drive signal of control circuit to 14xx pump laser A1 and 14xx pumping laser
Device B2,14xx pump laser A1 and 14xx pump laser B2 power output light under the driving of driving signal enters 14xx wave
In section wave multiplexer 3,3 multiplex output light of 14xx wave band wave multiplexer enters in 14xx and 15xx wavelength division multiplexer 4, and transmitter input is former
Beginning signal light 6 also enters in 14xx and 15xx wavelength division multiplexer 4, and 14xx and 4 output light of 15xx wavelength division multiplexer enter at a distance
In single mode optical fiber 5, remote 5 output light of single mode optical fiber enters in Scale Fiber-Optic Hydrophone Array 7.
The reversed Raman amplifiction part is mainly pumped by 14xx pump laser A1,14xx pump laser B2,14xx
Pu laser C9,14xx pump laser D10,14xx wave band light polarization beam combiner A11,14xx wave band light polarization beam combiner B12,
14xx wave band wave multiplexer 3,14xx and 15xx wavelength division multiplexer 4, photoreceiver 13, Scale Fiber-Optic Hydrophone Array 7, remote single-mode optics
Fibre 5, control circuit 8 are constituted, output drive signal of 14xx pump laser A1 and 14xx the pump laser B2 in control circuit 8
Control lower output light and enter in 14xx wave band light polarization beam combiner A11 and carry out depolarized conjunction beam, 14xx pump laser C9 and
14xx pump laser D10 output light under the output drive signal control of control circuit 8 enters 14xx band of light polarization coupling
In device B12 and carry out depolarized conjunction beam, the conjunction beam of 14xx wave band light polarization beam combiner A11 and 14xx wave band light polarization beam combiner B12
Output light enters 14xx wave band wave multiplexer 3, and the output of 14xx wave band wave multiplexer 3 enters in 14xx and 15xx wavelength division multiplexer 4,
14xx and the output of 15xx wavelength division multiplexer 4 enter remote single mode optical fiber 5, and the output of Scale Fiber-Optic Hydrophone Array 7 enters remote single
Mode fiber 5, the remote output of single mode optical fiber 5 enter in 14xx and 15xx wavelength division multiplexer 4,14xx and 15xx wavelength division multiplexer 4
Output enters photoreceiver 13 and amplifies.
14xx pump laser A1,14xx pump laser B2 wavelength of the Raman amplifiction part in the same direction is different.14xx
Pump laser A1,14xx pump laser B2, which is provided, motivates light source for remote single mode optical fiber Raman amplifiction；14xx wave band
Wave multiplexer 3 is used for the multiplex of different wave length pump light；14xx and 15xx wavelength division multiplexer 4 emit for pump light and optical sender
The multiplex of signal light is transmitted；Remote single mode optical fiber 5 actually directlys adopt underwater submarine optical fiber cable, and remote single mode optical fiber 5 is both
Optical signal transmission medium is also the gain media of Raman amplifiction；Optical sender is original for providing 7 downlink of Scale Fiber-Optic Hydrophone Array
Signal light；Control circuit 8 for controlling the output light function of two 14xx pump laser A1,14xx pump laser B2 respectively
Rate, optical power value are shown.
Reversed Raman amplifiction part 14xx pump laser A1,14xx pump laser B2 and 14xx pump laser
It is two groups of wavelength that C9,14xx pump laser D10, which are divided to, provides and motivates light source for remote single mode optical fiber Raman amplifiction；14xx
Wave band light polarization beam combiner A11,14xx wave band light polarization beam combiner B12 is used for the conjunction beam and polarization state of identical wavelength pump light
It is depolarized；14xx wave band wave multiplexer 3 is used for the multiplex of different wave length pump light；14xx and 15xx wavelength division multiplexer 4 are used for pump light
It is transmitted with the multiplex of array return signal light；Remote single mode optical fiber 5 actually directlys adopt underwater submarine optical fiber cable, remote single mode
Optical fiber 5 is both the gain media of optical signal transmission medium and Raman amplifiction；Photoreceiver 13 is used for Scale Fiber-Optic Hydrophone Array 7
Uplink return signal light such as amplifies at the processing；Control circuit 8 swashs for control 14xx pump laser A1,14xx pumping respectively
Output optical power, the optical power value of light device B2 and 14xx pump laser C9,14xx pump laser D10 is shown.
Raman amplifiction part in the same direction specific workflow of the invention is as follows:
1, the output of 14xx pump laser A1 is connect with the respective input of 14xx wave band wave multiplexer 3, different wave length
The output of 14xx pump laser B2 is connect with another respective input of 14xx wave band wave multiplexer 3.
2, the output end of 14xx wave band wave multiplexer 3 is connect with 14xx with the respective input of 15xx wavelength division multiplexer 4, and two
Wavelength two-beam has synthesized light beam.
3, transmitter input original signal light 6 is connect with 14xx with the respective input of 15xx wavelength division multiplexer 4,14xx wave
Duan Guang and 15xx band of light carries out light combination.
4, the output end of 14xx and 15xx wavelength division multiplexer 4 is connect with the input terminal of the remote single mode optical fiber 5 of 100km.
5, the output end of remote single mode optical fiber 5 is connect with the input terminal of Scale Fiber-Optic Hydrophone Array 7.
Control circuit 8 is controlled and is shown to 14xx pump laser A1,14xx pump laser B2 Output optical power.
Reversed Raman amplifiction part specific workflow of the invention is as follows:
1, the output end of 14xx pump laser A1,14xx pump laser B2 and 14xx wave band light polarization beam combiner A11
Input terminal connection, carry out light combination and polarization state it is depolarized.
2, the output end of 14xx pump laser C9,14xx pump laser D10 and 14xx wave band light polarization beam combiner B12
Input terminal connection, carry out light combination and polarization state it is depolarized.
3, the output of 14xx wave band light polarization beam combiner A11 is connect with the respective input of 14xx wave band wave multiplexer 3.
4, the output of 14xx wave band light polarization beam combiner B12 is connect with the respective input of 14xx wave band wave multiplexer 3.
5, the multiplex output of 3 different wave length of 14xx wave band wave multiplexer and 4 respective input of 14xx and 15xx wavelength division multiplexer
Connection.
6, the output of Scale Fiber-Optic Hydrophone Array 7 is connect with the input terminal of remote single mode optical fiber 5, returns to array signal light.
7, the output of remote single mode optical fiber 5 is connect with 14xx with 4 respective input of 15xx wavelength division multiplexer, 14xx with
The output of 15xx wavelength division multiplexer 4 is connect with the input terminal of photoreceiver 13.
8, control circuit 8 is to 14xx pump laser A1,14xx pump laser B2,14xx pump laser C9,14xx
The Output optical power of pump laser D10 is controlled and is shown.
It is understood that it will be understood by those skilled in the art that being subject to technical solution of the present invention and inventive concept
It all should fall within the scope of protection of the appended claims of the present invention with replacement or change.
Claims (5)
1. a kind of non-relay long-range large-scale optical fiber hydrophone array Raman amplification system, it is characterised in that: main includes same
To Raman amplifiction part and reversed Raman amplifiction part, the input pumping light of Raman amplifiction part in the same direction passes in the same direction with signal light
Defeated, the original optical signal for being advanced into Scale Fiber-Optic Hydrophone Array under is effectively amplified, reversed Raman amplifiction part it is defeated
Enter pump light and signal light reverse transfer, the optical signal for returning to uplink optical fibers hydrophone is effectively amplified, to make
The preamplifier of photoreceiver can open work.
2. non-relay long-range large-scale optical fiber hydrophone array Raman amplification system according to claim 1, feature
Be: the Raman amplifiction part in the same direction is mainly by 14xx pump laser A (1), 14xx pump laser B (2), 14xx wave
Section wave multiplexer (3), 14xx and 15xx wavelength division multiplexer (4), remote single mode optical fiber (5), transmitter input original signal light
(6), Scale Fiber-Optic Hydrophone Array (7), control circuit (8) are constituted, control circuit (8) output drive signal to 14xx pump laser
The drive of A (1) and 14xx pump laser B (2), 14xx pump laser A (1) and 14xx pump laser B (2) in driving signal
Dynamic lower power output light enters in 14xx wave band wave multiplexer (3), 14xx wave band wave multiplexer (3) multiplex output light enter 14xx with
In 15xx wavelength division multiplexer (4), transmitter inputs original signal light (6) and also enters in 14xx and 15xx wavelength division multiplexer (4),
14xx and 15xx wavelength division multiplexer (4) output light enter in remote single mode optical fiber (5), remote single mode optical fiber (5) output light
Into in Scale Fiber-Optic Hydrophone Array (7).
3. non-relay long-range large-scale optical fiber hydrophone array Raman amplification system according to claim 1, feature
Be: reversed Raman amplifiction part is mainly by 14xx pump laser A (1), 14xx pump laser B (2), 14xx pumping laser
Device C (9), 14xx pump laser D (10), 14xx wave band light polarization beam combiner A (11), 14xx wave band light polarization beam combiner B
(12), 14xx wave band wave multiplexer 3,14xx and 15xx wavelength division multiplexer (4), photoreceiver (13), Scale Fiber-Optic Hydrophone Array (7),
Remote single mode optical fiber (5), control circuit (8) are constituted, and 14xx pump laser A (1) and 14xx pump laser B (2) are being controlled
The output drive signal of circuit (8) processed controls lower output light and enters in 14xx wave band light polarization beam combiner A (11) and carry out depolarized
Beam, 14xx pump laser C (9) and 14xx pump laser D (10) are closed under the output drive signal control of control circuit (8)
Output light enters in 14xx wave band light polarization beam combiner B (12) and carries out depolarized conjunction beam, 14xx wave band light polarization beam combiner A (11)
Enter 14xx wave band wave multiplexer (3), 14xx wave band wave multiplexer with the conjunction beam output light of 14xx wave band light polarization beam combiner B (12)
(3) output enters in 14xx and 15xx wavelength division multiplexer (4), and 14xx enters remote single with 15xx wavelength division multiplexer (4) output
Mode fiber (5), Scale Fiber-Optic Hydrophone Array (7) output enter remote single mode optical fiber (5), remote single mode optical fiber (5) export into
Enter in 14xx and 15xx wavelength division multiplexer (4), 14xx and 15xx wavelength division multiplexer (4) output enters photoreceiver (13) and put
Greatly.
4. non-relay long-range large-scale optical fiber hydrophone array Raman amplification system according to claim 2, feature
Be: 14xx pump laser A (1), 14xx pump laser B (2) wavelength of the Raman amplifiction part in the same direction are different.
5. non-relay long-range large-scale optical fiber hydrophone array Raman amplification system according to claim 3, feature
It is: the reversed Raman amplifiction part 14xx pump laser A (1), 14xx pump laser B (2) and 14xx pumping laser
Device C (9), 14xx pump laser D (10) are divided into two groups of wavelength.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811009829.2A CN109449744A (en) | 2018-08-31 | 2018-08-31 | A kind of non-relay long-range large-scale optical fiber hydrophone array Raman amplification system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811009829.2A CN109449744A (en) | 2018-08-31 | 2018-08-31 | A kind of non-relay long-range large-scale optical fiber hydrophone array Raman amplification system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2590033Y (en) * | 2002-10-17 | 2003-12-03 | 武汉光迅科技有限责任公司 | Raman fibre-optical amplifier having equality gain |
| CN102593714A (en) * | 2012-02-28 | 2012-07-18 | 武汉光迅科技股份有限公司 | Single-pump multi-wavelength lasing semiconductor Raman pump laser and pump combination apparatus |
| CN106911394A (en) * | 2017-04-10 | 2017-06-30 | 中国电子科技集团公司第三十四研究所 | A kind of faint light remote-pumped amplifier based on double 1480nm lasers |
| CN108288999A (en) * | 2017-01-10 | 2018-07-17 | 光子瑞利科技（北京）有限公司 | The application that noise reduction distribution type fiber-optic water based on Rayleigh scattering is listened |
-
2018
- 2018-08-31 CN CN201811009829.2A patent/CN109449744A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2590033Y (en) * | 2002-10-17 | 2003-12-03 | 武汉光迅科技有限责任公司 | Raman fibre-optical amplifier having equality gain |
| CN102593714A (en) * | 2012-02-28 | 2012-07-18 | 武汉光迅科技股份有限公司 | Single-pump multi-wavelength lasing semiconductor Raman pump laser and pump combination apparatus |
| CN108288999A (en) * | 2017-01-10 | 2018-07-17 | 光子瑞利科技（北京）有限公司 | The application that noise reduction distribution type fiber-optic water based on Rayleigh scattering is listened |
| CN106911394A (en) * | 2017-04-10 | 2017-06-30 | 中国电子科技集团公司第三十四研究所 | A kind of faint light remote-pumped amplifier based on double 1480nm lasers |
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