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Laser output device

A laser output device, laser technology, applied in the direction of lasers, laser components, laser optical equipment, etc., can solve the problems of immediately irradiating pulsed light of other wavelengths, unknown, and degradation of measurement accuracy

Pending Publication Date: 2021-09-28
ADVANTEST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, when the time from irradiating a certain point P of the object to be measured with pulsed light of a certain wavelength to irradiating the point P with pulsed light of another wavelength becomes longer, due to the movement of the object to be measured (such as body motion), the measurement Accuracy Deterioration
[0003] However, no technique is known for irradiating pulsed light of a certain wavelength (one pulse or multiple pulses) immediately after another wavelength of pulsed light (one pulse or multiple pulses)
For example, in Patent Document 1, Patent Document 2, and Patent Document 3, although it is described that laser beams of different wavelengths are combined, they do not irradiate pulsed light of a certain wavelength immediately after irradiating pulsed light of another wavelength.

Method used

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  • Laser output device
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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0048] figure 1 It is a figure which shows the structure of the laser output apparatus 1 of 1st Embodiment. figure 2It is a plan view of the wavelength changing unit 14 of the first embodiment. image 3 It is a timing chart of the first pulse P1, the second pulse (before wavelength conversion) P2a, the second pulse (after wavelength conversion) P2b, and the third pulse P3 in the first embodiment. In addition, in image 3 In FIG. 2 , the thickness of the line representing the pulse and the type of the line (solid line or dotted line) are changed according to the wavelength.

[0049] The laser output device 1 of the first embodiment has: an excitation laser (pulse laser output unit) 10, an optical attenuator (ATT) 11, an acousto-optic modulator (optical path determination unit) (AOM) 12, a convex lens (parallelization unit) ( L1) 13, wavelength changing part (PPLN) 14, achromatic lens (focusing part) (L2) 16, filter (F) 17, optical fiber (MMF) 18, and timing control circuit ...

no. 2 approach

[0090] The laser output device 1 of the second embodiment is different from the laser output device 1 of the first embodiment in that an LN crystal substrate is provided for propagating traveling light.

[0091] Figure 5 It is a figure which shows the structure of the laser output apparatus 1 of 2nd Embodiment. The laser output device 1 of the second embodiment has: excitation laser (pulse laser output unit) 10, optical attenuator (ATT) 1, acousto-optic modulator (optical path determination unit) (AOM) 12, convex lens (parallelization unit) ( L1) 13, wavelength changing part (PPLN) 14a, 14b, achromatic lens (focus part) (L2) 16, filter (F) 17, optical fiber (MMF) 18, and timing control circuit (timing control part) 19. Hereinafter, the same reference numerals are assigned to the same parts as those of the first embodiment, and description thereof will be omitted.

[0092] Excitation laser (pulse laser output part) 10, optical attenuator (ATT) 1, acousto-optic modulator (opt...

no. 3 approach

[0099] The difference between the laser output device 1 of the third embodiment and the laser output device 1 of the first embodiment is that the acousto-optic modulator (AOM) (optical path determination unit) 12 is changed and an acousto-optic deflector (AOD) (optical path determination unit) is used. Department) 120.

[0100] Figure 6 It is a figure which shows the structure of the laser output apparatus 1 of 3rd Embodiment. Figure 7 It is a timing chart of the first pulse P1, the second pulse (before wavelength conversion) P2a, the second pulse (after wavelength conversion) P2b, and the third pulse P3 of the third embodiment. In addition, in Figure 7 In FIG. 2 , the thickness of the line representing the pulse and the type of the line (solid line, dotted line, or one-dot-dash line) are changed according to the wavelength.

[0101] The laser output device 1 of the third embodiment has: an excitation laser (pulse laser output unit) 10, an optical attenuator (ATT) 1, an ...

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PUM

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Abstract

According to the invention, pulsed light of other wavelengths is irradiated immediately after pulsed light of a certain wavelength is irradiated. A laser light output device (1) is provided with an excitation laser (10) that outputs laser light having a predetermined wavelength (Wl) as a first pulse (P1) having a predetermined frequency; an acoustic optical modulator (12) that receives the first pulses (P1), determines an optical path as one of a plurality of optical paths (OP1, OP2) for each first pulse, and outputs the optical paths; a convex lens (13) that parallels the traveling directions of the traveling light that travels in each of the plurality of optical paths (OP1, OP2); a wavelength change part (14) that receives the output (second pulse (P2a)) of the convex lens (13) and outputs the output by changing the output into different wavelengths (W2, W3); an achromatic lens (16) that receives and focuses the output of the wavelength change part (14); and an optical fiber (18) that receives the output of the achromatic lens (16) at the end surface (18E) of the core (18c), and the achromatic lens (16) focuses the output of the wavelength change part (14) on the end surface (18E) of the core (18c).

Description

technical field [0001] The present invention relates to a laser output device that outputs laser light with multiple wavelengths as pulses. Background technique [0002] Conventionally, it is known to perform measurement (for example, measurement of oxygen saturation in blood) using a response (for example, absorption coefficient) obtained by irradiating an object to be measured (for example, a living body) with pulsed light. In addition, it is also known that the response obtained from the object to be measured differs depending on the wavelength of the pulsed light. Therefore, from the viewpoint of improving measurement accuracy, it is desirable to irradiate the object to be measured with pulsed light of various wavelengths. At this time, when the time from irradiating a certain point P of the object to be measured with pulsed light of a certain wavelength to irradiating the point P with pulsed light of another wavelength becomes longer, due to the movement of the object ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/117H01S3/00
CPCH01S3/117H01S3/005G02F1/3548G02F1/3558H01S3/0092H01S3/0071G02F1/33G02B6/4204G01M11/3118G01S7/4802G02B6/4296G02B27/1006G02F1/113G02B6/32G02F1/39
Inventor 樱井孝夫
Owner ADVANTEST CORP