EP1889339A2 - Low stress, high thermal conduction laser rod mounting - Google Patents
Low stress, high thermal conduction laser rod mountingInfo
- Publication number
- EP1889339A2 EP1889339A2 EP06748798A EP06748798A EP1889339A2 EP 1889339 A2 EP1889339 A2 EP 1889339A2 EP 06748798 A EP06748798 A EP 06748798A EP 06748798 A EP06748798 A EP 06748798A EP 1889339 A2 EP1889339 A2 EP 1889339A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- mercury
- laser
- amalgam
- laser host
- host medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/042—Arrangements for thermal management for solid state lasers
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C7/00—Alloys based on mercury
-
- 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
- H01S3/02—Constructional details
-
- 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
- H01S3/02—Constructional details
- H01S3/025—Constructional details of solid state lasers, e.g. housings or mountings
-
- 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
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0405—Conductive cooling, e.g. by heat sinks or thermo-electric elements
-
- 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
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/061—Crystal lasers or glass lasers with elliptical or circular cross-section and elongated shape, e.g. rod
-
- 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
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/0612—Non-homogeneous structure
-
- 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
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/0617—Crystal lasers or glass lasers having a varying composition or cross-section in a specific direction
Definitions
- Typical methods of removing heat from a longitudinally laser pumped laser rod involve mounting it into a thermally conductive block made of a solid metal such as copper.
- the best heat transfer occurs when the dimension any gap between the laser host material and the thermally conductive block is minimal, preferably zero.
- the difference in the values of thermal expansion coefficients of the materials involved along with machining and tolerancing errors can cause the materials to contact in an undesirable fashion. This contact can create stress-induced birefringence in the laser host material, lowering the laser performance. Poor or intermittent contact between the two materials can make uniform cooling of the rod difficult and also rapidly increase thermal resistance.
- laser host materials are cubic or nearly cubic in their crystalline structure or are glass or glass-ceramics. Thermal expansion of laser host materials and the stress of the materials caused by a differential in expansion between the contacted laser host material and any mount or supporting structure induces birefringence in such materials. Stress and strain can alter polarization of light traveling through laser host materials creating depolarization effects. If the laser is required to have a polarized output, stress-induced depolarization term can become one of the largest loss components in the laser. High thermal resistance between the laser host material and the heat sink can create significantly larger peak temperatures within the laser rod reducing performance. Good heat removal that approaches the ideal state depends on very good thermal contact between the heat sink and the laser host material. Large thermal drops can take place if voids are present or poor contact is maintained.
- Typical heat sinks comprise high thermal conductivity materials such as copper and aluminum and may exchange the heat through liquid interfaces such as water contact or forced air.
- Thermally induced problems can arise at the interface between the laser host material and the heat sink material, because they are typically unrelated materials with different thermal expansion characteristics. Machining, polishing, or forming the heat sinks so precisely that a good thermal interface can take place mechanically without voids is very difficult.
- a third material between the laser host material and the heat sink to act as an intermediary. The purpose of this material is to make up for machining errors and physical size differences between the components.
- it is very difficult to introduce such materials without creating voids or significantly more complex heat sink structures. Examples of such materials are silicone thermal heat sink compound and Indium alloy foil. Problems related to many of these types of materials are voids, creep, and drying out.
- Mercury readily forms amalgams with such high thermally conductive materials as silver and gold.
- a laser rod is plated with metals such as silver or gold on the circumferential surfaces.
- Both the rod and heat exchanger bore are then placed in contact with elemental mercury.
- An amalgam immediately forms at an interface between the plated metal and mercury.
- a plated laser rod readily slides into the borehole.
- the cohesive nature of the mercury wets the interface creating continuity without voids.
- the laser rod can then be O-ring sealed or sealed by other means to hold it in position.
- the mercury will not readily form an amalgam on such materials as nickel and copper, so it only preferentially attaches to surfaces plated only with amalgamating metals such as gold or silver.
- a mount for suspending a laser medium has a cross section profile.
- the mount is configured to conduct heat away from the laser medium without imparting undue stress.
- the mount includes a laser host medium having a first cross section profile.
- a heat sink defines a bore.
- the bore has a second cross section profile configured to envelop the first cross section profile and further defines a generally uniform interspace between the first cross section profile and second first cross section profile.
- An amalgam of a mercury soluble metal is formed to substantially fill the interspace to support the laser host medium.
- the heat sink is plated to deposit a second mercury soluble foil.
- the heat sink is fabricated of the second mercury soluble metal.
- the mercury is held in an amalgamated solution.
- the invention provides a method for supporting a laser medium within a bore of a heat sink.
- the method includes plating a laser medium to deposit a foil.
- the foil includes a first mercury soluble metal.
- the laser medium is inserted into a bore a heat sink defines.
- the heat sink includes a second mercury soluble metal.
- Mercury is inserted into a gap the foil and the bore define, the mercury dissolving the first mercury soluble metal and the second mercury-soluble to form an amalgam to support the laser medium.
- FIG. IA is a cross-section of an inventive mount before an introduction of mercury
- FIG. IB is a cross-section of an inventive mount after an introduction of mercury;
- FIG. 2A is a side view of a laser host medium;
- FIG. 2B is a side view of a laser host medium with barrier material
- FIG. 2C is a side view of a laser host medium plated with a mercury-soluble foil and having barrier material
- FIG. 2D is a side view of a laser host medium plated with a mercury-soluble foil
- FIG. 3 A is cross-section side view of a heat sink
- FIG. 3B is cross-section side view of a heat sink with a bore surface plated with a mercury soluble foil
- FIG. 3 C is cross-section side view of a heat sink with a bore surface plated with a mercury soluble foil including a plated laser host medium;
- FIG. 3D is cross-section side view of the inventive mount assembly
- FIG. 4 is a flowchart portraying a method for supporting a laser medium.
- a mount for suspending a laser medium has a cross section profile.
- the mount is configured to conduct heat away from the laser medium without imparting undue stress.
- the mount includes a laser host medium having a first cross section profile.
- a heat sink defines a bore.
- the bore has a second cross section profile configured to envelop the first cross section profile and further defines a generally uniform interspace between the first cross section profile and second first cross section profile.
- An amalgam of a mercury soluble metal is formed to substantially fill the interspace to support the laser host medium.
- a mount 10 for suspending a laser host medium 12 has a cross-section profile.
- An embodiment of the inventive mount 10 is shown, including a laser host material 12, a heat sink 21, a first mercury-soluble foil 14, and a second mercury-soluble foil 17.
- the first mercury-soluble foil 14 and the second mercury-soluble foil 17 define an interspace 13 between them with a thickness t.
- a quantity of mercury is introduced to fill the interspace 13 (FIG. IA).
- portions of the first mercury-soluble foil 14 and the second mercury-soluble foil 17 dissolve into the introduced mercury to form a first amalgam 15 (FIG. IB) and a second amalgam 18 (FIG. IB).
- the amalgams 15, 18 support the laser host medium 12 without introducing large stress due to thermal expansion during operation.
- Amalgamation occurs when a mercury-soluble metal such as, for example, silver or gold, is exposed to mercury and as a result of the exposure, an alloy or amalgam is formed.
- the volume of the resulting alloy is generally the same as the added volumes of the elemental mercury and the elemental metal such as silver or gold that was added.
- the resulting amalgam is thicker to accommodate the added mercury.
- Amalgams may either be a very dense viscous liquid or a solid depending upon the physical properties such as the triple point of the resulting amalgam.
- the most common use for amalgams is in dental fillings where an amalgam of silver and mercury is forced into drilled recesses in tooth enamel to entirely fill the drilled recess thereby preventing the introduction of decay producing residue on enamel surfaces defining the recess.
- the laser host medium 12 is generally elongate in shape.
- the present invention is not limited to a cylindrical laser host media.
- the elongate cylinder is used for purposes of non-limiting illustration.
- the elongate cylinder has two ends that are symmetric.
- the laser host medium 12 is coated with a suitable barrier material 16 generally in the area of each of the two ends.
- the barrier material 16 is selected as a barrier to plating to suitably protect portions of a surface of the laser host medium 12, in the illustrative example, in the general location on each of the two ends.
- the coating with barrier material 16 leaves only a central portion of the cylinder exposed, to assure that plating will only occur on remaining central portion of the laser host medium 12.
- the central portion of the laser host medium 12 is selected to allow support along the lateral face of the laser host medium 12.
- a first mercury-soluble foil 14 is deposited on the laser host medium 12 in the areas that have not been coated with the barrier material 16.
- the first mercury-soluble foil 14 is deposited by any of several plating methods available.
- the method to deposit the first mercury-soluble foil 12 is selected to assure any voids between the first mercury-soluble foil 14 and the laser host medium 12 are minimal in number and size.
- a portions of the laser host medium 12 may be plated with a mercury insoluble metal thereby to define a boundary for the later amalgamation.
- a heat sink 21 defines a bore 11 passing through the heat sink 21.
- the defined bore 11 also includes two counter bores 25 generally at ends of the bore 11.
- a tubular heat sink is described, however, other configurations such as half tubes configured to join in a "clamshell" interlocking engagement will also suitably serve the formation of the mount 10. Other configurations may be selected to afford such heat exchange as is selected.
- flow channels are formed to interlock into a surrounding heat sink, the flow channels configured for fluid removal of heat from the heat sink.
- the resulting flow channels assembly is, however, generally tubular in shape and thus similar to the heat sink 21 portrayed in FIGS. 3A, 3B, 3C, and 3D.
- the interior surface of the bore 11 is plated to deposit the second mercury-soluble foil 17 along the whole of the interior surface of the bore 11.
- deposition means are suitably selected to deposit the second mercury-soluble foil 17, in a manner to assure any voids between the second mercury-soluble foil 17 and the heat sink 21 are minimal in number and size.
- the laser host medium 12, coated with the first mercury-soluble foil 14 is inserted into the plated bore 11 of the heat sink 21.
- the interspace 13 is defined with a thickness t with the insertion of the laser host medium 12.
- the laser host medium 12 is placed in the bore 11 in order that the thickness t is uniform around the laser host medium 12.
- the interspace 13 has been filled with mercury that partially to completely dissolved each of the first mercury-soluble foil 14 and the second mercury-soluble foil 17 each to form the first amalgam 15 and the second amalgam 18.
- portions of each of the first mercury-soluble foil 14 and the second mercury-soluble foil 17 dissolve to exhaust the mercury in favor of the formed first amalgam 15 and the formed second amalgam 18, though it is not necessary for successful practice of the invention.
- mercury is provided to dissolve all of the mercury-soluble foil 14 to form advantageously soft amalgams.
- 5- 15% of the other metal dissolved in mercury forms a higher viscosity, yet compliant gel-like substance.
- the resultant gel-like substance has proven to have thermal conduction properties better than mercury alone.
- the presence of mercury after amalgamation in the gel-like material prevents hardening, which might create stress in laser host material 12. If mixing does not take place, then the interface may consist of a harder thin layer of one amalgam type with a high percentage of dissolved metal next to a decreasing hardness compound due to less dissolution of the metal with the mercury.
- O-rings 24 have been inserted in the counter bore 25, sealing the first amalgam 15 and the second amalgam 18.
- pressure or keeper plates 27 are biased against the O-rings 24.
- the illustration exaggerates the length of the unsupported laser host medium 12 that extends past the O-rings 24 beyond the length used in practice for non-limiting illustration purposes only.
- a method 101 for forming amalgams to support a laser host medium 12 includes depositing the elemental or alloyed first mercury-soluble foil 14 on a surface of the laser host medium 12.
- the method 101 suitably exploits a cohesive property of mercury that allows the mercury to flow into the interspace 13 between either the mercury-soluble metal heat sink 21 or plated second mercury-soluble foil deposited in the bore 11 of the heat sink 21 and the first mercury-soluble foil plated on the laser host medium 12.
- the mercury After flowing into the interspace 13, the mercury forms the first amalgam 15 and the second amalgam 18 to couple to an efficient heat sink 21; the resulting mount 10 formed by the first amalgam 15, the second amalgam 18, and the heat sink 21 supports the laser medium 21 while having a very low and symmetric thermal resistance, thereby introducing negligible stress on the laser host medium 12 as the laser host medium 21 heats in operation.
- the method 101 for forming the mount 10 begins at a block 102, where outer surfaces of a supported laser medium 12 are prepared for plating by selectively masking surfaces that in the formed mount 10 will not have contact with the first amalgam 15.
- Such surfaces would include a pumping port (not shown), configured for the admission of a pumping energy, a high reflector port (not shown), and an output port (not shown) of a laser host medium 12 in operation.
- the purpose of the masking is to only expose those portions of the laser host medium 12 that will be in contact with the first amalgam 15 in the assembled mount 10.
- Photoresist is a photosensitive resin that loses its resistance to chemical etching when exposed to radiation. Irradiation allows selective removal of the photoresist. Because of the ability to selectively remove the photoresist, photoresist is used in such processes for the transference of a circuit pattern onto a surface of a semiconductor chip during production of an integrated circuit. Photoresist can be accurately placed on a surface for plating and then can be removed later with such solvents as methanol or acetone.
- selective application of a masking coating by painting a barrier coating on the laser host medium 12 will also suitably mask the laser host medium 12 from plating.
- the barrier material is placed at each of two ends of the laser host medium 12 to allow for formation of a high reflector and an output port.
- the first mercury-soluble foil 14 plated on the surface of the laser host medium 12 will dissolve in the presence of mercury, the first mercury-soluble foil 14 serves as a conduit, drawing mercury to follow the plated foil past seals used to contain the mercury upon later assembly.
- the barrier material in place only on designated portions of the surface of the laser host medium 12, the remaining exposed portions of the surface of the laser host medium 12 may optionally be subjected to processes to suitably pit the surface prior to plating. Small pits on the exposed portions of the surface of the laser host medium 12 allow a more secure bond between the laser host medium 12 and a deposited metal foil plated on the laser host medium 12.
- a bore of a suitable heat sink is prepared for plating.
- the heat sink 21 is selected to define a bore that is suitably larger than the diameter of the laser host medium 12 along with the first mercury-soluble foil 14 such that the laser host medium 12 and the first mercury-soluble foil 14 can just slide through the defined bore 11 of the heat sink 21 upon assembly.
- the heat sink 21 may optionally define as well a counterbore (not shown) to form a shoulder suitable to receive an O-ring seal.
- the bore is cleaned to prevent contamination.
- the designated surfaces of the laser host medium 12 are plated with the first mercury-soluble foil 14.
- Mercury-soluble metals include gold, silver, copper, indium, tin, zinc and a few other elements or alloys that can form suitable amalgams.
- Suitable amalgams can be selected from listings in reference texts as "Binary Alloy Phase Diagrams" ISBN 0-87170-403-X providing phase diagrams for mercury-based alloys with other metals
- Plating is by a process that is suitably selected from a variety of processes including electrolytic plating, vapor deposition, e-beam deposition, other forms of vapor deposition, chemical deposition, and electro-chemical deposition as well as an electroless silvering process as sold by PEACOCK LABSTM of Philadelphia, PA.
- Materials suitable for plating include gold, silver, copper, indium, tin, and zinc as well as other metals that can form suitable amalgams in the presence of mercury.
- One such amalgam may be formed by effectively dissolving 10% by weight of silver into the mercury to create a soft paste with 5 times the thermal conductivity as pure mercury.
- Another heat conductive amalgam is generated by dissolving silver flake (Ferro CorporationTM) into mercury and then painting plated foil surfaces with the resulting amalgam.
- an amalgam of gold may be painted onto the plated surfaces since substantial amounts of either silver or gold can be dissolved into mercury. Since some amalgams solidify and turn very hard, (such as the case of dental fillings) at working temperatures, the component metal or alloy is selected according to the desired composition of the final amalgam in order to keep the product in the range of liquid to soft paste.
- Copper serves as a less suitable amalgam since only 0.006% atomic copper, by weight, can be dissolved into mercury at room temperature.
- tungsten does not form an amalgam, but in its presence copper will form an amalgam even though the solubility of mercury into copper is very low.
- the mercury is supplied in excess to prevent formation of a saturated solution of mercury yielding a softer amalgam.
- Amalgams formed by simple introduction of the mercury are suitable for the inventive purpose. Wetting cohesive properties of mercury, assures that mercury will eliminate voids between the first amalgam 15 and the surface of the laser host medium 12.
- the plating deposits a first mercury-soluble foil of sufficient thickness or depth of plated metal so that the mercury cannot dissolve all of the plated metal before the assembly process is complete. Even at that, empirical evidence shows that foils of even submicron plating thickness are sufficient in depth to allow assembly of the mount.
- Plating as set forth at the block 108 may also be performed by applying a thin application of metal to form a foil such as by vacuum depositing or by any other suitable means that create a foil of the desired metallic thickness without introducing voids.
- the remaining photoresist or barrier material is removed from the supported medium.
- the means of removing the barrier material without degrading the laser host medium 12 is selected based upon the barrier medium used. For instance, photoresist is removed with either methanol or acetone to expose the surface of the laser host medium 12. Where solvent removal is used, the solvent is selected to be inert relative to the laser host medium 12.
- the material of the heat sink is determined to be suitable for direct amalgamation with the mercury. Where a heat sink, is not itself formed of mercury-soluble metals, a second mercury-soluble foil 17 is deposited on the surface of the bore for formation of the second amalgam 18.
- the defined bore of the heat sink is plated to deposit a mercury-soluble foil on the surface of the bore.
- portions of the surface of the bore that will not intentionally contact mercury when assembled may be plated with materials such as nickel that resist amalgamation so that the mercury cannot creep out past the O-ring seal.
- a list of appropriate plating materials is essentially the same as the mercury-soluble materials listed in the discussion of plating the laser host medium 12 at the block 108.
- a process of complementary plating is often advantageous.
- plating a sealing surface immediately contiguous to the deposited mercury soluble foil yields a mercury-inert portion of the surface to further contain the flow of mercury out of the mount 10.
- Appropriate foil materials for the complementary plating are nickel, chrome, platinum, and any other non-amalgamating materials.
- foil deposited plating at the blocks 108 and 117 is such that an interspace 13 of thickness t is defined between the plated foil surface of the medium relative to the plated surface of the bore and in an embodiment of the invention the interspace gap is very small, on the order of 1 mil.
- Wetting properties of mercury allow passage of elemental mercury to dissolve the first mercury-soluble foil 14 and the second mercury soluble foil even with t being approximately equal to 1 mil.
- addition of mercury to dissolve the mercury-soluble foils 14, 17 requires suitable space to accommodate addition of mercury for formation of the first amalgam 15 and the second amalgam 18 that form to fill the interspace gap 13.
- the dimension t of the interspace 13 is not critical to the formation of the amalgam but may be selected to yield a greatest heat transfer coefficient in the assembled mount 10.
- mercury deposited in the interspace 13 dissolves the first mercury-soluble foil 14 plated on the laser host medium 12 to form the first amalgam 15 and the second mercury-soluble foil 17 to form the second amalgam 18.
- Introduction of mercury into the interspace need not be by introducing the mercury into an otherwise assembled mount, the mercury may be introduced, for example, by dipping the host laser medium 12 with its plated first mercury-soluble foil 14 into a vial of mercury, or painting mercury onto the first mercury-soluble foil or by other means.
- mercury is uniformly deposited on the plating and in sufficient quantities to generate a uniform amalgamation across the first mercury-soluble foil 14 and, if present, the second mercury-soluble foil.
- mercury may be deposited on both the first mercury-soluble foil 14 and, if present, the second mercury-soluble foil 17 to create an amalgam on each.
- the process is not such as to require the same amalgam on both the first mercury-soluble foil 14 and, if present, the second mercury-soluble foil 17 as an interaction between the first amalgam 15 and the second amalgam 18 will not change the total volume of amalgam generated within the bore of heat sink 21 upon assembly.
- the supported medium 12 is slid into the defined bore 11 of the heat sink 21.
- Mercury's wetting properties allow it to wet each surface, such that in assembly, no void is created supported as the laser host medium 12 is inserted into the heat sink 11.
- amalgams remain in a thick viscous liquid phase or in a paste-like soft solid, that does not apply undue stress to the host laser material, even over very wide temperature ranges.
- melting points for many of the mercury amalgams range is a small radius around -38 0 C range, which is well below the operational temperature of many laser systems. In the event the laser system should cool to below that temperature due to environmental conditions, the volumetric shrinkage occurring is quite small.
- seals such as O-ring seals 24 are seated between the supported laser host medium 12 and the defined surface of the heat sink 21.
- the seals 24 may be packed behind a pressure plate or keeper plate 27 that compresses the O-ring suitably to assure adequate sealing. It is advantageous to rapidly assembly the mounts and to seal the mounts with the o-ring seals 24 in order that the underlying non-wetting materials are not exposed to ambient gases, trapping such gases and thereby reducing thermal conduction.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Semiconductor Lasers (AREA)
- Lasers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/149,594 US7415052B2 (en) | 2005-04-27 | 2005-06-09 | Low stress, high thermal conduction laser rod mounting |
PCT/US2006/011270 WO2006135468A2 (en) | 2005-06-09 | 2006-03-28 | Low stress, high thermal conduction laser rod mounting |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1889339A2 true EP1889339A2 (en) | 2008-02-20 |
Family
ID=37467492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06748798A Withdrawn EP1889339A2 (en) | 2005-06-09 | 2006-03-28 | Low stress, high thermal conduction laser rod mounting |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1889339A2 (en) |
WO (1) | WO2006135468A2 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3999867A (en) * | 1975-04-02 | 1976-12-28 | Wilks Scientific Corporation | Sampling cell of salt crystals amalgamated to metal spacer |
US4601038A (en) * | 1982-01-18 | 1986-07-15 | Gte Government Systems Corporation | Conduction cooled solid state laser |
US4615951A (en) * | 1984-12-18 | 1986-10-07 | North American Philips Corporation | Metallized rare earth garnet and metal seals to same |
JPH05167142A (en) * | 1991-12-19 | 1993-07-02 | Nippon Steel Corp | Solid state laser equipment |
US20020110166A1 (en) * | 2001-02-14 | 2002-08-15 | Filgas David M. | Method and system for cooling a laser gain medium |
DE10226724B4 (en) * | 2001-06-15 | 2006-06-22 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Laser crystal with a cooling structure, method for producing a laser crystal with a cooling structure and use of such a laser crystal |
-
2006
- 2006-03-28 WO PCT/US2006/011270 patent/WO2006135468A2/en active Application Filing
- 2006-03-28 EP EP06748798A patent/EP1889339A2/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2006135468A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2006135468A3 (en) | 2008-03-20 |
WO2006135468A2 (en) | 2006-12-21 |
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