JP3325961B2 - Dye laser device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dye laser device using a dye laser cell for forming a dye excitation area.

[0002]

2. Description of the Related Art A dye laser device usually uses a dye solution obtained by dissolving a powdery dye in an organic solvent as a laser medium, irradiates the dye solution with excitation light to excite the dye, and oscillates dye laser light. Things.

As a light source of excitation light for exciting a dye,
Argon laser, krypton laser, etc. (continuous oscillation), flash lamp, Nd: YAG laser, ruby laser,
There are a nitrogen laser, a copper vapor laser, an excimer laser, and the like (pulse oscillation). The output characteristics of the dye laser device are mainly determined by a medium used as an excitation light source of the excitation laser device.

Further, there are several tens of types of dyes as a laser medium of the dye laser device, and one type of dye has an oscillation wavelength range of about several tens to one hundred and several tens nm. By sequentially exchanging these dyes, the dye laser light output from the dye laser device can continuously exchange the wavelength range from the ultraviolet region to the near infrared region through the visible region. The dye laser device is expected to be applied to various optical fields such as a basic field, a medical field, a nuclear fuel cycle field, and the like, centering on spectroscopy, by taking advantage of this excellent property of wide wavelength tunability.

By the way, dyes, which are laser media, have a durable life. Therefore, there is a dye laser apparatus which circulates and uses dyes.

[0006] Such a conventional dye laser device is shown in FIG.
As shown in FIG. 3, the dye solution c stored in the dye laser medium tank 31 is supplied into the dye laser cell 34 via the supply circuit 33 by the pumping action of the circulation pump 32. The dye solution c is kept at a required temperature by the temperature control unit 35 provided in the dye laser medium tank 31.

The dye laser cell 34 is irradiated with a laser beam (excitation light) L output from a laser device 36 such as an argon laser or a krypton laser to excite the dye in the supplied dye solution c. The excited dye emits light, and the emitted light is amplified by a reflection mirror (not shown) or the like and output as dye laser light S.

On the other hand, the dye solution c after excitation is supplied to the reflux circuit 3
7, during which dust and dirt are removed by a dust removal filter 38 provided in a return circuit 37, and returned to the dye laser medium tank 31. Thereafter, the dye solution c is thus circulated between the dye laser medium tank 31 and the dye laser cell 34 to be excited.

The dye excitation method includes a lateral excitation type in which a dye laser beam having an optical axis perpendicular to the circulating dye solution flow is obtained, and a dye laser beam having an optical axis parallel to the circulating dye flow. There is a longitudinal excitation type obtained.

Here, examples of a laterally excited dye laser device are shown in FIGS. 14 (a) to 14 (c). FIG. 14A shows that the excitation light L from one direction is introduced into the dye solution c guided by the current plate (plate) 39 formed of a metallic substance and circulated in the flow path 40 in the dye laser cell 34. A part of the channel 40 is irradiated via the lens 41 to excite the dye in the dye solution c. That is, the flow path 40 in the dye laser cell of the dye
Are configured as dye excitation areas.

FIG. 14B shows that the excitation light L is applied to a part of the flow channel 40 (dye excitation area) from two directions, and as shown in FIG. In some cases, excitation light is applied to a part of the flow path 40 (dye excitation area) from directions (six directions in the figure).

[0012]

SUMMARY OF THE INVENTION In a dye laser device,
It is required to improve the quality (wavelength stability, transverse mode uniformity, etc.) of the obtained dye laser beam.

However, among the above-mentioned transversely excited dye laser devices, those shown in FIGS.
Since the direction of the excitation light L applied to the dye excitation area which is a part of the channel 40 is deviated, the intensity distribution of the obtained dye laser light in the transverse mode does not become a uniform Gaussian distribution of the TEM _00. In addition, the intensity distribution in the vicinity of the portion irradiated with the excitation light becomes a non-uniform intensity distribution that is particularly strong.

[0014] In addition, in the one shown in FIG.
It is designed to irradiate the dye excitation area, which is a part of the flow path 40, with excitation light from multiple directions so that the dye is excited evenly even a little. Since excitation is not possible, uniform excitation cannot be expected.

On the other hand, in the vertical excitation, there is a type in which the shape of the dye laser cell is devised so that the dye is uniformly excited even by the excitation light from one direction.

FIGS. 15 and 1 show the structure of this dye laser cell (prism-shaped dicell called a Bethune cell).
6 is shown.

In the case where the Bethune cell 42 is used, as shown in FIG. 15, the excitation light L from one direction is divided into four (L1, L2, L3, L4), and each of the divided excitation lights L1 , L2, L3, and L4 are provided in the guide section 43.
The flow path 40 through which the dye solution c flows is uniformly irradiated (that is, the entire flow path 40 forms a dye excitation area). Therefore, a uniform Gaussian distribution of TEM ₀₀ is obtained as the transverse mode intensity distribution of the obtained dye laser beam S.

However, this Bethune cell 4
The dye laser device using No. 2 is irradiated with excitation light for a long time in the direction in which the dye solution flows because of vertical excitation. Therefore, in the case of a dye laser device of pulse oscillation by excitation of a pulse laser, if the repetition frequency is increased, for example, 1
The dye excited by the pulsed excitation light irradiation is 2
Excitation light is not replaced even during irradiation of the excitation light after the pulse, and the excitation efficiency after the second pulse is low. As a result, the oscillation or amplification efficiency of the entire dye laser device decreases. For the above reasons, at present, a dye laser device using a Bethune cell can only be used up to a repetition frequency of about 100 Hz.

In a conventional dye laser device, a rectifying plate in a dye laser cell, a part of a temperature control circuit, etc.
Since the part in contact with the dye is formed of a metallic substance, impurities such as a metal are mixed in the dye when the dye is repeatedly circulated. At this time, the excited and activated dye causes the metal, which is an impurity, to dissolve into the dye solution as ions.

The ions generated from the metal, which is an impurity,
The dye reacts with the photo-decomposed organic acid to degrade the dye, and with the deterioration of the dye, a burn-in phenomenon may occur in a part of the dye laser cell. For this reason, the dye laser cell needs to be replaced, and the maintenance is difficult.

The present invention has been made in view of the above circumstances, and a high repetition pulse oscillation can be performed using a dye laser cell having a novel shape, and the transverse mode of the obtained dye laser light has a uniform intensity distribution of TEM _00. It is an object of the present invention to provide a dye laser device.

Further, the present invention has been made in view of the above-mentioned circumstances, and among the constituent elements of a dye laser device, a part in contact with a dye is changed from a metal to another non-metallic substance to prevent image sticking. It is an object to provide a dye laser device.

[0023]

According to a first aspect of the present invention, there is provided a dye laser device comprising: a dicel body having a prism-like structure formed by an incident excitation light incident surface and a pair of reflecting surfaces; A dye laser cell, a dye solution holding means for holding a dye solution as a laser medium, and a circulation circuit for circulating the dye solution between the dye laser cell and the dye solution holding means, wherein the dye laser cell In a lateral excitation type dye laser device that irradiates the dye solution flowing in the inside with excitation light to excite the dye, and outputs dye laser light, the dye cell body has a substantially U-shape from the reflection surface top side to the incident surface side. Alternatively, a substantially V-shaped groove is provided along the cell longitudinal direction, and the groove forms a reversing flow path for reversing the flow of the dye solution in a plane perpendicular to the cell longitudinal direction. While composing the dye excitation area, the Daicel body the incident excitation light, the reflecting surface constituting the entrance and pairs, to the dye excitation area, are guided so as to be irradiated from its surroundings.

According to another aspect of the present invention, there is provided a dye laser apparatus comprising: a prism-shaped dye laser cell; a dye solution holding means for holding a dye solution as a laser medium; A circulating circuit that circulates the dye laser cell and the dye solution holding means, and irradiates the dye solution in the dye laser cell with excitation light to output dye laser light. The part of the dye holding means and the circulation circuit that is in contact with the dye solution is formed of a non-metallic substance such as glass, resin, or plastic.

[0025]

In the dye laser cell applied to the dye laser device according to the present invention, the main body of the dicell has excitation light (incident excitation light).
Is formed into a prism shape from an incident surface on which the light is incident, and a pair of reflecting surfaces, and a substantially U-shaped or substantially V-shaped groove is formed in the longitudinal direction of the cell from the top of the reflecting surface of the Daicel main body to the incident surface. It is provided along the direction. This groove is a flow path of the dye solution for inverting the dye solution at a substantially U-shaped or substantially V-shaped portion, and an inverted portion near the substantially U-shaped or substantially V-shaped portion is formed as a dye excitation area. I have.

On the other hand, in the dye laser cell, the incident excitation light incident through the incident surface of the dye laser cell is guided by the incident surface and the pair of reflecting surfaces, and is divided into, for example, a plurality of excitation irradiation lights. The excited irradiation light uniformly irradiates the dye excitation area from the surroundings. In this case, since the dye flow path is formed as an inversion flow path that flows in a direction substantially perpendicular to the incident direction of the incident excitation light in the dye excitation area, the dye is immediately replaced with a new dye after the dye is excited. And the excitation efficiency is increased.

As a preferred embodiment for irradiating the dye excitation area from the periphery, the reflection surface is divided into a required number, for example, two (first reflection surface, second reflection surface). In this case, the incident excitation light, and the excitation irradiation light reflected by the first reflecting surface, for example, in a direction substantially orthogonal to the incident direction,
The dye excitation area is uniformly illuminated from its surroundings by, for example, the excitation irradiation light reflected obliquely backward with respect to the incident direction by the second reflection surface.

In the dye laser apparatus according to the first aspect of the present invention using such a dye laser cell, the dye solution is supplied from the dye solution holding means to the inside of the dye laser cell via a circulation circuit.

The supplied dye solution circulates in the inversion channel while reversing the flow of the dye solution in a plane perpendicular to the cell longitudinal direction. The dye is excited by irradiating the dye solution flowing through the inversion section (dye excitation area) of the inversion channel with excitation light. At this time, since the dye excitation area is uniformly irradiated with the excitation irradiation light from the surrounding area by using the dye laser cell, the dye is uniformly excited, and the dye solution is uniformly excited. (Excitation type). In addition, as described above, the dye subjected to excitation can be immediately replaced with a new dye.

As a result, it is possible to obtain a dye laser beam having a high excitation efficiency and a uniform Gaussian distribution of the transverse mode intensity distribution of the TEM ₀₀ .

Further, in the dye laser device according to the second aspect, of the dye laser cell, the dye holding means, and the circulating circuit as components thereof, the portion in contact with the dye solution is made of a non-metallic material such as glass, resin, plastic or the like. (Or coating with a non-metallic substance) reduces the incorporation of impurities such as metals into the dye solution, thereby eliminating the cause of burning of the dye laser cell.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dye laser device according to the present invention will be described below with reference to FIGS.
First, a dye laser cell applied to the dye laser device according to the present invention will be described.

The dye laser cell 1 is formed in a substantially hexagonal prism shape, and includes an incident surface a of the incident excitation light L and a pair of reflecting surfaces b divided into a first reflecting surface b1 and a second reflecting surface b2. It comprises a prism dicell 2 configured and a seal plate 3 fixed in a liquid-tight manner to the hexagonally opposed surfaces d1 and d2 of the prism dicell 2.

The prism dicell 2 is formed in a so-called tapered shape so that the hexagonal opposing surfaces d1 and d2 become thinner toward the incident surface b (base surface) on which the incident excitation light L is incident. In the prism dicell 2, a substantially U-shaped or V-shaped groove is provided along the cell longitudinal direction from the reflection surface top side to the incident surface side, and the groove is formed on a surface perpendicular to the cell longitudinal direction. A reversing flow path 4 for reversing the flow of the dye solution c is formed therein, and a reversing portion 4a near a substantially U-shaped portion of the reversing flow path 4 constitutes a dye excitation area for exciting the dye.

Incidentally, a hexagonal prism-shaped prism dicell 2
Is formed by cutting a triangular prism-shaped prism dicell 2a. That is, as shown in FIG. 4, the base surface (θ1) has an isosceles triangular facing surface having a substantially 45 degree angle,
This opposing surface penetrates the central portion including the apex portion e of the triangular prism-shaped prism dicell 2a formed in a tapered shape that becomes thicker in the vertex direction through a U-shaped cutout. Perform first stage cutting.

Next, the opposing apex angles f1 and f2 are represented by θ
The second and third stages are cut along the axial direction so that 2 is approximately 63.5 degrees, thereby forming a substantially hexagonal prism-shaped prism dicell 2. In the prism dicell 2 thus formed, the excitation light L irradiated
A pair of surfaces having an incident angle of approximately 45 degrees with respect to the optical axis of
A pair of surfaces which are the reflection surface b1 and whose incident angle is approximately 63.5 degrees with respect to the optical axis of the incident excitation light L to be irradiated is a second surface.
The reflection surface b2.

FIG. 5 is a schematic diagram showing one embodiment of a dye laser device using the dye laser cell 1 having the above-described structure.

The dye laser device shown in FIG. 5 is a lateral excitation type dye laser device, and outputs a dye laser beam perpendicular to the direction of dye circulation. That is, the dye laser device is
A prismatic dye laser cell 1 provided with a flow path forming block 1a for forming a flow path for the dye, a dye laser medium tank (dye solution holding means) 5 holding a dye solution c as a laser medium, and a dye solution c Circulating circuit 6 for circulating between the dye laser cell 1 and the dye laser medium tank 5,
A laser device 7 for irradiating the dye laser cell 1 with a laser beam (excitation light) L for excitation.

The dye laser medium tank 5 is provided with a temperature controller 8 for maintaining the temperature of the dye solution c in the tank 5 at a required temperature.

The circulation circuit 6 includes a supply circuit 6 a for supplying the dye solution c held in the dye laser medium tank 5 to the dye laser cell 1, and a dye solution c supplied for excitation in the dye laser cell 1. A pump 9 serving as a power source for circulating the dye solution c on the supply circuit 6a, and a pump circuit 9 serving as a power source for circulating the dye solution c on the supply circuit 6a. A dust filter 10 for removing dust and the like is provided.

The flow path forming block 1a is divided into three as shown in FIG. 5, and forms an inlet flow path 11 and an outlet flow path 12 for the dye solution c. In addition, the flow path forming block 1 a is joined to the prism dicell 2 by the O-ring 13 while maintaining the liquid-tight state of the inlet flow path 11 and the outlet flow path 12.

Next, the operation will be described.

The dye solution c stored in the dye laser medium tank 5 is pumped by the pump 9 to pass through the supply circuit 6a and the inlet flow path 11 of the flow path forming block 1a. 10. The supplied dye solution c is circulating in the inversion channel while reversing the flow in a plane perpendicular to the cell longitudinal direction.

On the other hand, the dye laser cell 1 is irradiated with a laser beam (incident excitation light) L output from the laser device 7 and being, for example, approximately 15 mm parallel light. This incident excitation light L is incident on the excitation light incident surface a.

The incident excitation light L incident on the excitation light incident surface a
Depends on the cutting shape of the prism dicell 2.
It is apparently divided into excitation irradiation lights L1 to L5 of about 3 mm.
That is, as shown in FIG. 6, the excitation irradiation light L3 for directly irradiating the inversion portion 4a (dye excitation area) of the inversion channel 4 is incident on the first reflection surface b1, and the optical axis is substantially the same as the incident direction. The light is reflected in the direction orthogonal to the excitation light L1 and L5 for irradiating the reversing part 4a (dye excitation area) and the second reflection surface b2, and is reflected obliquely backward with respect to the incident direction. Excitation irradiation light L2 and L4 for irradiating 4a (dye excitation area).

That is, the inversion channel 4 (dye excitation area)
Is uniformly illuminated from the periphery by the irradiation excitation light.

In addition, since the dye channel is formed as an inversion channel that flows in a direction substantially perpendicular to the incident direction of the incident excitation light in the dye excitation area, the excited dye immediately becomes a new dye. Can be replaced by

Accordingly, the dye in the supplied dye solution c is uniformly excited in the inversion section 4a (dye excitation area), and the excited dye emits light. And dye laser light,
The dye solution c is output in a direction perpendicular to the flow (a direction perpendicular to the paper surface).

In the obtained dye laser light, since the dye is uniformly excited, the intensity distribution of the transverse mode is substantially TEM ₀₀
Can be obtained such that a uniform Gaussian distribution is obtained. Further, as described above, since the flow path of the dye is formed as an inversion flow path in which the excited dye can immediately replace a new dye, even in a pulsed dye laser device, the repetition frequency Since there are no restrictions, a high-repetition rate dye laser device can be realized.

In the present embodiment, the dye laser cell is formed by dividing the pair of reflecting surfaces into two so that the excitation light is divided into five, but the present invention is not limited to this. Instead, a pair of reflective surfaces are partitioned into a required number, and the partitioned reflective surfaces form a dye laser cell such that the reflected excitation light is reflected in a required direction, and the dye excitation area is uniformly irradiated. You may.

Next, a second embodiment of the dye laser device according to the present invention is shown in FIGS.

The dye laser device shown in FIG. 7 is a lateral excitation type dye laser device, and has a prismatic dye laser cell 21 formed of quartz glass and a dye laser medium holding a dye solution c as a laser medium. A tank (dye solution holding means) 22 and a circulation circuit 23 for circulating the dye solution c between the dye laser cell 21 and the dye laser medium tank 22
And a pulse laser device 25 for irradiating the dye laser cell 21 with a pulse laser beam L for excitation via a lens 24.

The dye laser medium tank 22 is
And a temperature control unit 26 for maintaining the temperature of the dye solution c in the inside at a required temperature.

The circulation circuit 23 includes a supply circuit 23a for supplying the dye solution c held in the dye laser medium tank 22 to the dye laser cell 21;
And a reflux circuit 23b for refluxing the dye solution c supplied to the dye laser medium tank 22 to the dye laser medium tank 22, and a pump 27 as a power source for circulating the dye solution c on the supply circuit 23a and a reflux circuit 23b. Is provided with a dust filter 28 for removing dust and the like in the dye solution c used for excitation.

The dye laser cell 21 is provided with a rectifying plate (plate) 29 for guiding the flowing dye solution c. The plate 29 is made of quartz glass (a material identical to that of the cell 21) which is a nonmetallic material. ).

Next, the operation will be described.

The dye solution c stored in the dye laser medium tank 22 is pumped by the pump 27
The dye is supplied into the dye laser cell 21 via the supply circuit 23a. The dye solution c is maintained at a required temperature by the temperature control unit 26 provided in the dye laser medium tank 22.

The dye solution c supplied into the dye laser cell 21 flows through the dye laser cell 21 while being guided by the plate 29.

On the other hand, the laser beam (excitation light) L output from the laser device 25 is
4 excites the dye in the supplied dye solution c. The excited dye emits light, and the emitted light is amplified by a reflection mirror (not shown) or the like and output as dye laser light.

On the other hand, the dye solution c after excitation is supplied to the reflux circuit 2
3b, the dust and dirt are removed by a dust removal filter 28 provided in the reflux circuit 23b, and the dust is returned to the dye laser medium tank 22. Hereinafter, the dye solution c is stored in the dye laser medium tank 22 and the dye laser cell 2 in this manner.
It circulates between 1 and is provided for excitation.

Here, in the dye laser device shown in FIG. 7, (1) a plate 29 made of quartz glass, and (2) a plate 29 made of stainless steel (S
An experiment was conducted to compare the image sticking phenomenon occurring in the dye laser cell 1 by operating each of the dye laser cells 1 and 2 formed as described above. Note that an excimer laser device was used as the pulse laser device, and the excitation energy was about 300.
mJ / pulse, the total amount of the dye solution was 1 liter, the concentration of the dye solution was 0.3 g / l, and the dye used was Rhodamine 6G.

As a result of the experiment, in (2), the excitation light was irradiated at 1.5 × 10 ⁶ shots (integrated pulse number), and the excitation light was applied to the inside of the dye laser cell (the side in contact with the dye solution). A state in which the dye was burned black was confirmed.

On the other hand, in the case where the plate 29 was formed from SUS to quartz glass (1), no burning phenomenon was observed even when the excitation light was irradiated with 3 × 10 ⁶ shots.

FIG. 8 shows the result of analyzing the burned-in substance.
10 to FIG. FIG. 8 is a diagram showing the form of the substance burned on the dye laser cell, and FIG. 9 is an enlarged view thereof (the scale is shown at the bottom in the figure. That is, the total length of the scale of FIG. About 3 cm above 8, 9), but actually 150
μm (FIG. 8) and 3.8 μm (FIG. 9)).

Here, a qualitative analysis of the burnt-in material shown in FIGS. 8 and 9 shows that, in addition to the quartz glass component Si and the coating component Au, as shown in FIG.
Components such as r, Fe, Ni, and Cu were included.

On the other hand, the results of qualitative analysis of the plate 29 formed of SUS are shown in FIGS. FIG. 11 shows an analysis result of the surface of the plate 29, and FIG.
Is an analysis result of the back surface of the plate 29. As shown in FIGS. 11 and 12, most of the components of the plate 9 (SUS) were included in the burned-in components.

Therefore, it is estimated that the burned-in component is the metal component (SUS) forming the plate 29.

Table 1 shows the results of analysis of impurities contained in the dye solution c after the excitation light irradiation.

[0069]

[Table 1]

When the plate 9 was made of SUS, the dye stock solution (Rhodamine 6G; Rhodamine 6G (C _{28
H 31 N 2 O 3 Cl)} ) metal element was hardly detectable in has been detected from the dye solution after irradiation (irradiation dye solution is used to dilute the stock solution to 1/4) .

When the plate 29 is made of quartz glass, the amount of detected metal elements is smaller than that in the case where the plate 29 is made of SUS. The reason why the metal element is detected is presumed to be that another portion (such as a part of the temperature control unit 26) in contact with the dye solution is formed of SUS.

From the above results, when a portion such as a rectifying plate (plate), which is in contact with a dye solution, is formed of a metallic substance, the element of the metallic substance dissolves as an impurity in the dye solution, and Causing the burn-in phenomenon,
This results in deterioration of the dye. However, by forming the contact portion of the dye solution with quartz glass, which is a non-metallic substance, the penetration of impurities into the dye solution can be reduced, the sticking of the dye can be suppressed, and the deterioration of the dye can be prevented.

In this embodiment, quartz glass is used as the nonmetallic substance. However, the present invention is not limited to this. For example, similar effects can be obtained by using resin or plastic.

Further, in this embodiment, when at least a part (for example, a plate) of the portion in contact with the dye solution is formed of a metallic substance, the part formed of the metallic substance is replaced with glass, resin, Similar effects can be obtained by coating with a non-metallic substance such as plastic.

[0075]

As described above, according to the dye laser device of the first aspect of the present invention, the incident excitation light incident through the incident surface of the dye laser cell is reflected by the incident surface and the paired reflection light. Guided by a surface, for example, is divided into a plurality of excitation irradiation lights, and the plurality of excitation irradiation lights surrounds a reversal portion (dye excitation area) near a substantially U-shaped or substantially V-shaped portion of the reversal flow path. Irradiation can be uniform. As a result, the dye in the dye solution flowing through the dye excitation area is uniformly excited, and dye laser light is output in a direction perpendicular to the flow of the dye solution. In addition, since the dye channel is formed as an inversion channel that flows in a direction substantially perpendicular to the incident direction of the incident excitation light in the dye excitation area, the dye is immediately replaced by a new dye after the dye is excited. be able to.

In the transverse mode of the dye laser light thus obtained, since the dye is uniformly excited, the TEM
_{Since the} dye has a uniform intensity distribution of ₀₀ and can be replaced with a new dye immediately after the dye is excited,
Even for high repetition pulse oscillation by pulse laser,
It is possible to provide a dye laser device that can be sufficiently used.

Further, according to the dye laser device of the second aspect, of the dye laser cell, the dye holding means, and the circulating circuit as the constituent elements, the portion in contact with the dye solution is made of non-glass, resin, plastic or the like. By forming with a metal substance (or coating with a non-metallic substance), impurities such as metals dissolve into the dye solution can be reduced, and as a result, the cause of burning of the dye laser cell can be eliminated. Therefore, the deterioration of the dye is suppressed, and the sticking of the dye laser cell is prevented, so that the labor for replacing the dye laser cell can be omitted and the maintenance can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a dye laser cell applied to a dye laser device according to the present invention.

FIG. 2 is a front view of the incident excitation light shown in FIG. 1 as viewed from the incident surface side.

FIG. 3 is an enlarged view of a prism dicell partially extracted from the dye laser cell shown in FIG. 2;

FIG. 4 is a plan view of a prism dicell partially extracted from the dye laser cell shown in FIG. 2;

FIG. 5 is a conceptual diagram showing a first embodiment of the dye laser device according to the present invention.

FIG. 6 is a conceptual diagram illustrating the operation of the dye laser cell in the first embodiment.

FIG. 7 is a conceptual diagram showing a second embodiment of the dye laser device according to the present invention.

FIG. 8 is a view showing a burned-in substance.

FIG. 9 is an enlarged view of FIG. 8;

FIG. 10 is a qualitative analysis diagram of a burned-in substance.

FIG. 11 is a qualitative analysis diagram of a plate surface.

FIG. 12 is a qualitative analysis diagram of the back surface of the plate.

FIG. 13 is a conceptual diagram showing a conventional dye laser device.

FIGS. 14A to 14C are conceptual diagrams illustrating a method of exciting a dye laser device.

FIG. 15 is a schematic sectional view of a Bethune cell.

FIG. 16 is a schematic plan view of a Bethune cell.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 dye laser cell 2 prism dicell 3 seal plate 4 inversion channel 4 a inversion section (dye excitation area) 5 dye laser medium tank 6 circulation circuit 7 laser device 8 temperature control section 9 pump 10 dust filter 11 entrance channel 12 exit channel 13 O-ring a Incident surface b Reflective surface b1 First reflective surface b2 Second reflective surface c Dye solution L, L1 to L5 Excitation light

Continuation of front page (56) References JP-A-57-126189 (JP, A) JP-A-2-42779 (JP, A) JP-A-4-28284 (JP, A) JP-A-2-2190 (JP) JP-A-48-93291 (JP, A) JP-A-54-75997 (JP, A) JP-A-4-138438 (JP, A) JP-A-2-126694 (JP, A) 52-94380 (JP, U) Jikatsu Hei 4-769 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01S 3/00-3/30 JICST file (JOIS)

Claims (2)

(57) [Claims] 1. A dye laser cell in which a main body of a dicell is formed in a prism shape from an incident surface of incident excitation light and a pair of reflection surfaces, a dye solution holding means for holding a dye solution as a laser medium, and the dye A circulation circuit that circulates the solution between the dye laser cell and the dye solution holding means, and irradiates the dye solution flowing in the dye laser cell with excitation light to excite the dye, and outputs a dye laser light. In the excitation type dye laser device, a substantially U-shaped or substantially V-shaped groove is provided along the cell longitudinal direction from the reflection surface top side of the above-mentioned Daicel main body to the incident surface side. A reversing flow path for reversing the flow of the dye solution in a vertical plane is formed, and the reversing part of the reversing flow path constitutes a dye excitation area, while the Daicel body transmits the incident excitation light to the incident surface and the incident surface. A dye laser device characterized in that the dye excitation area is guided to irradiate the dye excitation area from its surroundings by a pair of reflective surfaces. 2. A prismatic dye laser cell, a dye solution holding means for holding a dye solution as a laser medium, and a circulation circuit for circulating the dye solution between the dye laser cell and the dye solution holding means. A dye laser device that emits a dye laser beam by irradiating the dye solution in the dye laser cell with excitation light, wherein the dye laser cell, the dye holding unit, and the circulation circuit, where the dye solution is in contact, are glass, A dye laser device formed of a nonmetallic material such as resin and plastic.