WO2015174819A2 - Method for producing narrow spectral linewidths - Google Patents

Method for producing narrow spectral linewidths Download PDF

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Publication number
WO2015174819A2
WO2015174819A2 PCT/MY2015/000030 MY2015000030W WO2015174819A2 WO 2015174819 A2 WO2015174819 A2 WO 2015174819A2 MY 2015000030 W MY2015000030 W MY 2015000030W WO 2015174819 A2 WO2015174819 A2 WO 2015174819A2
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Prior art keywords
linewidth
fwhm
half maximum
full wave
wave half
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PCT/MY2015/000030
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French (fr)
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WO2015174819A3 (en
Inventor
Binti Md Yusof ZALHAN
Ain Binti Mohd Aziz NUR
Hafizulfika Bin Hisham MOHD
Wit Jaksono GUNAWAN
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Mimos Bhd
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Mimos Bhd
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Publication of WO2015174819A3 publication Critical patent/WO2015174819A3/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/0245—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using an optical amplifier of light, e.g. doped fiber
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10084—Frequency control by seeding
    • 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
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1618—Solid materials characterised by an active (lasing) ion rare earth ytterbium

Definitions

  • the present invention relates to a method for producing narrow spectral linewidths more particularly by narrowing the full wave half maximum (FWHM) linewidth to a narrowed spectral linewidth.
  • FWHM full wave half maximum
  • LEDs light emitting diodes
  • FWHM full wave half maximum
  • Most LED spectral linewidth are broader and not exactly at its center wavelength. Instead of detecting the specific wavelength of a desired reaction of analyte detection, the detector detects the total intensity of its FWHM.
  • the conventional technologies using filters and assigned fluid to Bragg grating component reduces the spectral linewidth to its concern wavelength of the analyte.
  • the present invention provides a method of narrowing the full wave half maximum (FWHM) linewidth to a narrowed spectral linewidth comprising activating a non-linear optic component and producing a signal, providing full wave half maximum (FWHM) linewidth light source enters to the activated non- linear optic component, absorbing and quenching the full wave half maximum (FWHM) linewidth light to a nearer centre wavelength, determining behavior of the non-linear optic component on the required signal to narrow the full wave half maximum (FWHM) linewidth; and providing the activated non-linear optic component to narrow the full wave half maximum (FWHM) linewidth based on the required signal to a narrowed spectral linewidth.
  • FWHM full wave half maximum
  • the full wave half maximum (FWHM) linewidth is light emitting diode (LED) excitation light source.
  • LED light emitting diode
  • the non-linear optic is Ytterbium doped optical fiber which narrows the full wave half maximum (FWHM) linewidth to at least the nearest centre wavelength of the light source.
  • FWHM full wave half maximum
  • a laser pump is provided to activate the non-linear optic.
  • a control board is provided to feed a signal to the laser pump to produce a pump signal to the non-linear optic component during the activation stage.
  • the control board detects a response from the non-linear optic on the required signal to narrow full wave half maximum (FWHM) linewidth.
  • Figure 1 illustrates a diagram of components for a method for producing narrow spectral linewidths in accordance of the present invention.
  • Figure 2 illustrates a flowchart for a method for producing narrow spectral linewidths in accordance of the present invention.
  • Figure 3 illustrates a simulation result for a method for producing narrow spectral linewidths in accordance of the present invention.
  • the present invention describes a method of narrowing the full wave half maximum (FWHM) linewidth to a narrowed spectral linewidth.
  • Figure 1 illustrates a diagram of components for a method for producing narrow spectral linewidths in accordance of the present invention.
  • a non-linear optics component (110) is introduced i.e. Ytterbium doped optical fiber (112) and amplifiers operating at the 1 .0-1.1 nm wavelength region for nonlinear wavelength conversion.
  • Ytterbium-doped optical fiber (112) provides several key advantages regarding the amplification of short optical pulses.
  • Detection of analyte using optical technique requires light source (114) such excitation source (broad and incoherent) and an optical detector (1 6) as main components.
  • light source such excitation source (broad and incoherent) and an optical detector (1 6) as main components.
  • Most analyte reacts with light according to a corresponded wavelength and its molecular bonding.
  • Analyte molecular bonding vibrates at region of near infrared. When correct wavelength is determined, the molecular bonding vibrates based on its absorption properties; it is therefore such wavelength is selected to be used to detect such analyte molecular in a sample.
  • LED Light Emitting Diode
  • the non-linear optics component is a Ytterbium (Yb) doped optical fiber.
  • the light excited from LED has a non-linear effect caused by the Ytterbium (Yb) doped optical fiber (112).
  • the Ytterbium (Yb) doped optical fiber (112) at the same time is triggered to produce the effect by an excitation laser (118) via laser pumping.
  • a laser pump is provided to activate the non-linear optic.
  • the excitation laser (118) is determined one particular wavelength.
  • the effect from the Ytterbium (Yb) doped optical fiber (112) causes the linewidth of the LED source that shine into sample becoming narrower.
  • the narrowing effect located at the centre of FWHM of the LED source. Besides narrowing the spectrum, in some cases it produces some sidebands.
  • a control board (120) particularly an electronic control board is provided in the present invention to receive and send signal to and from the non-linear optic component (110), excitation laser source (114) and optical detector (116).
  • the control board receives input and trigger output to these three components in order to ensure correct linewidth and wavelengths to be narrowed.
  • the control board is provided to feed a signal to the laser pump to produce a pump signal to the non-linear optic component during the activation stage and detects a response from the nonlinear optic on the required signal to narrow full wave half maximum (FWHM) linewidth.
  • FWHM full wave half maximum
  • the narrowed light produced enters a sideband suppression device (122) to remove the sidebands, if any.
  • the clear narrowed light is then finally entered to the analyte sample (112).
  • the analyte sample absorbs the intensity of light of its wavelength and detector (116) detects the final intensity for further processing. Based on the detector's intensity reading, the post processing determines what type of analyte and concentration of the sample
  • the collimator is used to provide minimally spread of light when it propagates to the sample. This is also to avoid light dispersion with distance.
  • FIG. 2 illustrates a flowchart for a method for producing narrow spectral linewidths in accordance of the present invention.
  • a method of narrowing the full wave half maximum (FWHM) linewidth to a narrowed spectral linewidth begins with activating a non-linear optic component and producing a signal (210). Then, a full wave half maximum (FWHM) linewidth light source is provided to enter to the activated non-linear optic component (212). During this period, the full wave half maximum (FWHM) linewidth light is absorbed and quenched to a nearer centre wavelength (214). Subsequently, the behavior of the non-linear optic component is determined based on the required signal to narrow the full wave half maximum (FWHM) linewidth.
  • FWHM full wave half maximum
  • an activated non-linear optic component is provided to narrow the full wave half maximum (FWHM) linewidth based on the required signal to a narrowed spectral linewidth. Any sideband appears with the narrowed linewidth is further suppressed (216). This sideband is suppressed by attenuating the input signal relative to it.
  • the narrowed linewidth is then entered the sample for testing (218).
  • the sample contains analyte to be tested absorbs the light passing through it.
  • the molecular bonding within the sample and analyte absorb light according to its wavelength.
  • Light emitted from the sample is detected by a light detector (220) either based on transmittance, reflectance or trans- reflectance mode.
  • FIG. 3 illustrates a simulation result for a method for producing narrow spectral linewidths in accordance of the present invention.
  • the second Spectrum Analyser is monitoring the output. From the graph, it is observed that the original spectrum spread from around 1796.6nm and 1803.4nm before the Yb Doped fiber is applied. The ouput of the spectrum became narrow to around 1800nm after the light passing through the Yb Doped fiber.
  • One of the advantages of the method of the present invention is to detect molecular bonding in analyte via contactless approach optical sensor. Another advantage of the present invention is that each LED has its own broader FWHM spectral linewidth and narrowing the linewidth to its unique and precise wavelength which contributes to more accurate observations and determination of analyte concentration.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

The present invention relates to a method for producing narrow spectral linewidths more particularly by narrowing the full wave half maximum (FWHM) linewidth to a narrowed spectral linewidth. One of the advantages of the method of the present invention is to detect molecular bonding in analyte via contactless approach optical sensor. Another advantage of the present invention is that each LED has its own broader FWHM spectral linewidth and narrowing the linewidth to its unique and precise wavelength which contributes to more accurate observations and determination of analyte concentration.

Description

METHOD FOR PRODUCING NARROW SPECTRAL LINEWIDTHS
FIELD OF THE INVENTION The present invention relates to a method for producing narrow spectral linewidths more particularly by narrowing the full wave half maximum (FWHM) linewidth to a narrowed spectral linewidth.
BACKGROUND OF THE INVENTION
For analyte detection using light, determining absorption properties of its molecular bonding at particular wavelength selected such as glucose, broader spectral linewidth can lead to wrong interpretation of its concentration readings. The results of the detection are at its best accuracy only if the intensity reading is represented the wavelengths where the analyte molecule reacted.
The development of solid state semiconductor devices such as light emitting diodes (LEDs) has opened up the possibility of a new generation of energy efficient lighting solutions. Development of LEDs that emit light which is part of the electromagnetic spectrum has resulted in practical applications due to their long operational lives and high efficiency. In LED application for detection of chemical analyte, it will be based on its center wavelength of its full wave half maximum (FWHM). Most LED spectral linewidth are broader and not exactly at its center wavelength. Instead of detecting the specific wavelength of a desired reaction of analyte detection, the detector detects the total intensity of its FWHM. The conventional technologies using filters and assigned fluid to Bragg grating component reduces the spectral linewidth to its concern wavelength of the analyte.
To date, none of these technologies can produce narrow spectral linewidth to its concern wavelength without using filter of the analyte when deployed. Therefore, there is a need for a method for producing narrow spectral linewidths more particularly by narrowing the full wave half maximum (FWHM) linewidth to a narrowed spectral linewidth in LED application. The present invention further provides a considerable reduction of materials with even greater efficiency and economically during operation. SUMMARY OF THE INVENTION
The present invention provides a method of narrowing the full wave half maximum (FWHM) linewidth to a narrowed spectral linewidth comprising activating a non-linear optic component and producing a signal, providing full wave half maximum (FWHM) linewidth light source enters to the activated non- linear optic component, absorbing and quenching the full wave half maximum (FWHM) linewidth light to a nearer centre wavelength, determining behavior of the non-linear optic component on the required signal to narrow the full wave half maximum (FWHM) linewidth; and providing the activated non-linear optic component to narrow the full wave half maximum (FWHM) linewidth based on the required signal to a narrowed spectral linewidth.
In one of the embodiment of the present invention, the full wave half maximum (FWHM) linewidth is light emitting diode (LED) excitation light source.
In yet another embodiment of the present invention, the non-linear optic is Ytterbium doped optical fiber which narrows the full wave half maximum (FWHM) linewidth to at least the nearest centre wavelength of the light source.
In yet another embodiment of the present invention, a laser pump is provided to activate the non-linear optic.
In another embodiment of the present invention, a control board is provided to feed a signal to the laser pump to produce a pump signal to the non-linear optic component during the activation stage. The control board detects a response from the non-linear optic on the required signal to narrow full wave half maximum (FWHM) linewidth.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. Figure 1 illustrates a diagram of components for a method for producing narrow spectral linewidths in accordance of the present invention.
Figure 2 illustrates a flowchart for a method for producing narrow spectral linewidths in accordance of the present invention.
Figure 3 illustrates a simulation result for a method for producing narrow spectral linewidths in accordance of the present invention.
DETAILED DESCRIPTIONS OF THE INVENTION
The present invention will now be described in detail in connection with specific embodiments with reference to the accompanying drawings.
The present invention describes a method of narrowing the full wave half maximum (FWHM) linewidth to a narrowed spectral linewidth. Figure 1 illustrates a diagram of components for a method for producing narrow spectral linewidths in accordance of the present invention. To achieve the narrow spectral linewidth, a non-linear optics component (110) is introduced i.e. Ytterbium doped optical fiber (112) and amplifiers operating at the 1 .0-1.1 nm wavelength region for nonlinear wavelength conversion. Ytterbium-doped optical fiber (112) provides several key advantages regarding the amplification of short optical pulses. Detection of analyte using optical technique requires light source (114) such excitation source (broad and incoherent) and an optical detector (1 6) as main components. Most analyte reacts with light according to a corresponded wavelength and its molecular bonding. Analyte molecular bonding vibrates at region of near infrared. When correct wavelength is determined, the molecular bonding vibrates based on its absorption properties; it is therefore such wavelength is selected to be used to detect such analyte molecular in a sample.
Light Emitting Diode (LED) is chosen as light source (114), it is based on its centre wavelength. In order to get accurate results, the light detected parameter is used to determine the type of analyte sample or its concentration, the wavelength measured has to be narrowed as to its centre wavelength. During measurement of sample, LED with broader spectral linewidth is provided to enter the non-linear optics component. In present invention, the non-linear optics component is a Ytterbium (Yb) doped optical fiber. The light excited from LED has a non-linear effect caused by the Ytterbium (Yb) doped optical fiber (112). The Ytterbium (Yb) doped optical fiber (112) at the same time is triggered to produce the effect by an excitation laser (118) via laser pumping. In one of the preferred embodiment, a laser pump is provided to activate the non-linear optic. The excitation laser (118) is determined one particular wavelength. The effect from the Ytterbium (Yb) doped optical fiber (112) causes the linewidth of the LED source that shine into sample becoming narrower. The narrowing effect located at the centre of FWHM of the LED source. Besides narrowing the spectrum, in some cases it produces some sidebands. A control board (120) particularly an electronic control board is provided in the present invention to receive and send signal to and from the non-linear optic component (110), excitation laser source (114) and optical detector (116). The control board receives input and trigger output to these three components in order to ensure correct linewidth and wavelengths to be narrowed. The control board is provided to feed a signal to the laser pump to produce a pump signal to the non-linear optic component during the activation stage and detects a response from the nonlinear optic on the required signal to narrow full wave half maximum (FWHM) linewidth.
Subsequently, the narrowed light produced enters a sideband suppression device (122) to remove the sidebands, if any. The clear narrowed light is then finally entered to the analyte sample (112). The analyte sample absorbs the intensity of light of its wavelength and detector (116) detects the final intensity for further processing. Based on the detector's intensity reading, the post processing determines what type of analyte and concentration of the sample The collimator is used to provide minimally spread of light when it propagates to the sample. This is also to avoid light dispersion with distance.
Figure 2 illustrates a flowchart for a method for producing narrow spectral linewidths in accordance of the present invention. A method of narrowing the full wave half maximum (FWHM) linewidth to a narrowed spectral linewidth begins with activating a non-linear optic component and producing a signal (210). Then, a full wave half maximum (FWHM) linewidth light source is provided to enter to the activated non-linear optic component (212). During this period, the full wave half maximum (FWHM) linewidth light is absorbed and quenched to a nearer centre wavelength (214). Subsequently, the behavior of the non-linear optic component is determined based on the required signal to narrow the full wave half maximum (FWHM) linewidth. Finally, an activated non-linear optic component is provided to narrow the full wave half maximum (FWHM) linewidth based on the required signal to a narrowed spectral linewidth. Any sideband appears with the narrowed linewidth is further suppressed (216). This sideband is suppressed by attenuating the input signal relative to it. The narrowed linewidth is then entered the sample for testing (218). The sample contains analyte to be tested absorbs the light passing through it. The molecular bonding within the sample and analyte absorb light according to its wavelength. Light emitted from the sample is detected by a light detector (220) either based on transmittance, reflectance or trans- reflectance mode. The detector is selected based on the wavelength range used as a light excitation source. Figure 3 illustrates a simulation result for a method for producing narrow spectral linewidths in accordance of the present invention. When Yb Doped fiber introduced after the LED with normal FWHM with first Spectrum Analyser monitoring the original spectrum, the second Spectrum Analyser is monitoring the output. From the graph, it is observed that the original spectrum spread from around 1796.6nm and 1803.4nm before the Yb Doped fiber is applied. The ouput of the spectrum became narrow to around 1800nm after the light passing through the Yb Doped fiber.
One of the advantages of the method of the present invention is to detect molecular bonding in analyte via contactless approach optical sensor. Another advantage of the present invention is that each LED has its own broader FWHM spectral linewidth and narrowing the linewidth to its unique and precise wavelength which contributes to more accurate observations and determination of analyte concentration.
The foregoing embodiment and advantages are merely exemplary and are not to be construed as limiting the present invention. The description of the embodiments of the present invention is intended to be illustrative and not to limit the scope of the claims and many alternatives, modifications and variations will be apparent to those skilled in the art.

Claims

A method of narrowing the full wave half maximum (FWHM) linewidth to a narrowed spectral linewidth comprising
activating a non-linear optic component (110) and producing a signal;
providing full wave half maximum (FWHM) linewidth light source enters to the activated non- linear optic component (110);
absorbing and quenching the full wave half maximum (FWHM) linewidth light to a nearer centre wavelength;
determining behavior of the non-linear optic component (110) on the required signal to narrow the full wave half maximum (FWHM) linewidth; and
providing the activated non-linear optic component (1 0) to narrow the full wave half maximum (FWHM) linewidth based on the required signal to a narrowed spectral linewidth.
The method as claimed in Claim 1 wherein further comprises providing the narrowed spectral linewidth to a sideband suppression device (122) to remove the sidebands.
The method as claimed in Claim 1 wherein the full wave half maximum (FWHM) linewidth is light emitting diode (LED) excitation light source.
4. The method as claimed in Claim 1 wherein the non-linear optic is Ytterbium doped optical fiber (112) which narrows the full wave half maximum (FWHM) linewidth to at least the nearest centre wavelength of the light source.
5. The method as claimed in Claim 1 wherein a laser pump is provided to activate the nonlinear optic.
6. The method as claimed in Claim 5 wherein a control board (120) is provided to feed a signal to the laser pump to produce a pump signal to the non-linear optic component
(110) during the activation stage.
7. The method as claimed in Claim 6 wherein the control board (120) detects a response from the non-linear optic on the required signal to narrow full wave half maximum (FWHM) linewidth.
PCT/MY2015/000030 2014-05-16 2015-05-07 Method for producing narrow spectral linewidths Ceased WO2015174819A2 (en)

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MYPI2014001426 2014-05-16
MYPI2014001426 2014-05-16

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JP2518521B2 (en) * 1993-06-30 1996-07-24 日本電気株式会社 Optical modulator and Mach-Zehnder type optical intensity modulator driving method using the same
WO2005022705A2 (en) * 1997-03-21 2005-03-10 Imra America, Inc. High energy optical fiber amplifier for picosecond-nanosecond pulses for advanced material processing applications
JP2001083557A (en) * 1999-09-10 2001-03-30 Nikon Corp Laser device
JPWO2002095486A1 (en) * 2001-05-18 2004-09-09 株式会社ニコン Light source device, light irradiation device, and device manufacturing method
CA2664133C (en) * 2006-08-22 2012-10-23 Bayer Healthcare Llc A method for correcting a spectral image for optical aberrations using software
US9075284B2 (en) * 2010-04-28 2015-07-07 Osaka University Spectral width narrowing method, optical element and light source device
JP5914329B2 (en) * 2010-05-24 2016-05-11 ギガフォトン株式会社 Solid-state laser device and laser system
JP5648969B2 (en) * 2010-06-16 2015-01-07 株式会社ニコン Pulsed light transmission method and laser device using this transmission method

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