JPS62151827A - Near infrared ray laser device - Google Patents

Abstract

PURPOSE:To generate laser light and guide light by one oscillator and to eliminate the need to adjust their optical axes by generating the 2nd higher harmonic of near infrared laser light by non-linear crystal and using this light as the guide light. CONSTITUTION:The nonlinear crystal 16 and a filter 20, etc., are arranged on the optical path of a near infrared ray laser device. The nonlinear crystal 16 uses KDP (potassium dihydrogenphosphate) crystal which generates the 2nd higher harmonic and the filter 20 passes the 2nd higher harmonic, but reflects laser light totally. In this constitution, while a specific position is irradiated with green visible light of the 2nd higher harmonic, a laser output is controlled through a control circuit 14 with the laser light reflected by the filter 20 in the beginning of use. Then, the filter 20 is put away from the optical path and main irradiation is performed. Consequently, the laser light and guide light are generated by one oscillator and troublesome optical axis adjustments are not required.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a near-infrared laser device, particularly a near-infrared laser that irradiates laser light using a guide light in surgery, processing, etc. using laser light in the near-infrared region. Regarding equipment.

[Prior Art] Near-infrared laser light is used in many fields because it has extremely focused and high energy. For example, in the medical field, it is used in incisional surgery in the surgical field or in the treatment of retinal detachment in the eye. It is used for rapid surgery with extremely little bleeding or for treatment in microscopic areas.

In addition, in the industrial field, near-infrared lasers are used for processing such as cutting and welding of products, and material processing such as crystal growth, and contact processing or fine processing is performed efficiently, and near-infrared lasers are used in various fields. Equipment is used effectively.

This type of near-infrared sheath 11 device guides a laser beam to an irradiation position such as a surgical position using a guide light, and is used for surgery, processing, etc. Visible light other than F light is introduced into the irradiation position of the sea 11 light, and this visible light is used as guide light. Therefore, precise laser irradiation can be performed satisfactorily even in surgeries, processing, etc. that require high accuracy with the laser beam guided by the guide light.

[Problems to be Solved by the Invention] Problems of the Prior Art However, in the conventional near-infrared laser device described above, a laser beam in the visible range is oscillated separately from the near-infrared laser generator in order to reduce the guide light by 1q. Since a laser oscillator is used, and the near-infrared laser light and visible light emitted from two laser light sources must be placed on the same optical axis, it takes a lot of effort to adjust the optical system. There is also a device that uses two laser oscillators? ! 2) There was a problem that it was complicated and large.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a near-infrared radar device that generates both the sea 1f light and the guide light with one laser oscillator and does not require optical axis adjustment. Our goal is to provide the following.

[Means and effects for solving the problem 1+'+ff In order to achieve the object, the present invention guides the laser light to the irradiation position using a visible guide light to accurately irradiate the laser If light. In a near-infrared laser device that performs the It is characterized by being used as a guide light.

The nonlinear crystal has a property of converting several percent of the near-infrared laser light that passes through the crystal into second harmonics,
By passing the near-infrared laser beam through a nonlinear crystal, it is possible to generate a second harmonic on the same optical axis as the near-infrared laser beam, and obtain a guide light that perfectly matches the optical path of the near-infrared laser beam. be able to.

[Example] Preferred embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a near-infrared radar device according to the present invention, in which a laser oscillator 10 that generates near-infrared laser light is provided with a control circuit 14 via a power supply 12, and the control circuit 14 controls a desired output. generates laser light.

A characteristic feature of the present invention is that near-infrared laser light output from one laser oscillator is used to obtain both laser light and guide light, and for this purpose, a part of the near-infrared laser light is A nonlinear crystal 16 for converting the second harmonic into the second harmonic is placed on the output side of the laser oscillator 1o. For example, a KDP (potassium dihydrogen phosphate) crystal is used as the nonlinear crystal 16, and this crystal strongly generates a second-order or higher-order nonlinear effect, that is, particularly a second harmonic. Specifically, if the second harmonic is converted within 10% of the near-infrared laser beam, and the wavelength of the near-infrared laser beam is λ (-1/ω) = 1.064 μm, then The wavelength of the second harmonic is λ - 2/ω) = 0
．． It becomes 532 μm. Therefore, this second harmonic becomes green visible light.

In this way, the laser light and guide light output from the nonlinear crystal 16 are irradiated to the surgical site etc. with their outputs controlled, but in this embodiment, only the guide light is used in step 1), and In order to adjust the output of the laser beam to a desired value during the irradiation, a filter 20 is placed between the quartz glass 18 and the nonlinear crystal 16. However, this filter 20
The guide light, which is the second harmonic, is passed through, but the laser light is totally reflected. Therefore, the intensity of the near-infrared laser beam reflected from the filter 20 is measured by the light receiving element 22, and the output signal from this light receiving element is supplied to the control circuit 14, which irradiates the guide light. During this time, the laser light output can be adjusted to the set value by the control circuit 14.

Next, when irradiating a target object with laser light, rotate the filter 20 away from the optical axis and follow the chain line 2 in the figure.
Since it is moved to the position indicated by 0-, the nonlinear crystal 1
The laser beam outputted from 6 and its second harmonic are supplied to quartz glass 18 .

Therefore, the SIA light transmitted through the quartz glass 18 is irradiated onto the target position for Rede surgery and processing.

Also in this case, some of the infrared laser light and second harmonics reflected from the quartz glass 18 are transmitted to the light receiving element 2.
4, and its output signal is supplied to a control circuit 14, which controls the output of the irradiated laser light.

In this way, a part of the infrared Rade light output from one Rade oscillator 10 is converted into visible light and used as a guide light, and the course of the laser light is changed by the filter 24, so that the guide light The irradiation of the laser beam and the irradiation of the near-infrared radar light and the guide light are selectively performed at 1!7, making it possible to perform laser surgery, laser processing, etc. in a well-procedure manner.

[Effects of the Invention] As explained above, the near-infrared laser beam is transmitted through the nonlinear crystal while at the same time generating its second harmonic is avoided, and this second harmonic is used as the guide light. Both laser light and guide light can be obtained with a single laser oscillator without using a laser oscillator within the visible range to generate the light.

In addition, since the optical axes of the laser beam and the guide light are perfectly aligned without adjustment, it is possible to
Optical devices such as mirrors become unnecessary, and the laser device itself can be downsized.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a preferred embodiment of a near-infrared ray device according to the present invention. 10... See 11 Oscillator 14... Control circuit 16... Nonlinear crystal 18... Quartz glass 20... Filter 22, 24... Light receiving element.

Claims (2)

[Claims] (1) In a near-infrared laser device that accurately irradiates laser light using a guide light that guides the laser light to the irradiation position, a nonlinear system that transmits the near-infrared laser light and simultaneously generates the second harmonic of the near-infrared laser light A near-infrared laser device comprising a crystal and using the second harmonic as a guide light. (2) In the device according to claim (1), the laser beam transmitted through the nonlinear crystal is reflected off the optical axis during irradiation with only the guide light, and its intensity is measured to adjust the output of the laser beam. A near-infrared laser device characterized by: