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1. WO1999033151 - LASER PUMP CAVITY WITH IMPROVED THERMAL LENSING CONTROL, COOLING, AND FRACTURE STRENGTH AND METHOD

Publication Number WO/1999/033151
Publication Date 01.07.1999
International Application No. PCT/US1998/026003
International Filing Date 08.12.1998
IPC
H01S 3/042 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
02Constructional details
04Cooling arrangements
042for solid state lasers
H01S 3/06 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
H01S 3/08 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
08Construction or shape of optical resonators or components thereof
H01S 3/094 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
09Processes or apparatus for excitation, e.g. pumping
091using optical pumping
094by coherent light
H01S 3/0941 2006.1
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
09Processes or apparatus for excitation, e.g. pumping
091using optical pumping
094by coherent light
0941of a semiconductor laser, e.g. of a laser diode
CPC
H01S 3/042
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
02Constructional details
04Arrangements for thermal management
042for solid state lasers
H01S 3/0606
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
0602Crystal lasers or glass lasers
0606with polygonal cross-section, e.g. slab, prism
H01S 3/0612
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
0602Crystal lasers or glass lasers
0612Non-homogeneous structure
H01S 3/08072
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
08Construction or shape of optical resonators or components thereof
08072Thermal lensing or thermally induced birefringence; Compensation thereof
H01S 3/08095
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
08Construction or shape of optical resonators or components thereof
08095Zig-zag travelling beam through the active medium
H01S 3/094
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
09Processes or apparatus for excitation, e.g. pumping
091using optical pumping
094by coherent light
Applicants
  • RAYTHEON COMPANY [US]/[US]
Inventors
  • BYREN, Robert, W.
  • SUMIDA, David, S.
  • BRUESSELBACH, Hans, W.
Agents
  • RAUFER, Colin, M.
Priority Data
08/994,42319.12.1997US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) LASER PUMP CAVITY WITH IMPROVED THERMAL LENSING CONTROL, COOLING, AND FRACTURE STRENGTH AND METHOD
(FR) CAVITE DE POMPAGE LASER AVEC REGULATION DE L'EFFET DE LENTILLE THERMIQUE, REFROIDISSEMENT ET RESISTANCE A LA RUPTURE AMELIORES, ET PROCEDE ASSOCIE
Abstract
(EN) A laser pump cavity apparatus (10) with integral concentrator provides improved thermal lensing control, cooling and fracture strength. The concentrator is formed around a doped solid-state laser medium by diffusion bonding, using a material different than the doped laser medium and with a substantially lower index of refraction, higher thermal conductivity and higher stress fracture strength than the doped laser crystal. The concentrator has a top cladding layer (46) with a cylindrical focusing surface (18) and a bottom cladding layer (48) with a cylindrical focusing surface (18) and may have edge cladding layers (50). Cold plates (24), each of which also has one cylindrical surface (22 and 45), are placed in thermal contact with the cylindrical surfaces of the top (46) and bottom (48) cladding layers. The cylindrical surfaces (46 and 48) preferably have hyperbolic or quasi-hyperbolic shaped. The laser pump cavity apparatus (10) is preferably pumped with several laser diode arrays (26) in directions transverse to a laser beam axis (12). The pumplight is injected from the laser diode arrays (26) through the edge cladding layers (50) in directions toward line foci (20) of the cylindrical surfaces (46 and 48). The concentrator top (46) and bottom (48) cladding material is preferably sapphire and the doped solid-state laser medium is preferably Yb:YAG. The edge cladding layers (50) are preferably thermally insulating to maintain a one-dimensional heat flow condition with the doped laser medium, by forming them of a material that has lower thermal conductivity than the material used for the top (46) and bottom (48) cladding layers. The edge cladding layers (50) are preferably made of undoped YAG material.
(FR) Dispositif cavité de pompage laser comportant un concentrateur monobloc qui permet d'améliorer la régulation de l'effet de lentille thermique, le refroidissement et la résistance à la rupture. Le concentrateur est formé autour d'un milieu laser à semi-conducteur dopé par liaison par diffusion au moyen d'un matériau différent du milieu du laser dopé et ayant, par rapport au cristal laser dopé, un indice de réfraction sensiblement plus bas et une conductivité thermique et une résistance à la rupture plus élevées. Le concentrateur comporte une couche de métallisation supérieure (46) présentant une surface de focalisation cylindrique (18) et une couche de métallisation inférieure (48) présentant une surface de focalisation cylindrique (18). Il peut également comporter des couches de métallisation latérales (50). Des plaques de refroidissement (24), dont chacune présente également une surface cylindrique (22, 45), sont en contact thermique avec les surfaces cylindriques des couches de métallisation supérieure (46) et inférieure (48). Les surfaces cylindriques (46, 48) ont de préférence une forme hyperbolique ou quasi hyperbolique. Le dispositif cavité de pompage laser (10) est de préférence pompé par plusieurs réseaux de diodes laser (26) dans des directions transversales par rapport à l'axe (12) du faisceau laser. La lumière de pompage est injectée depuis les réseaux de diodes (26) et traverse les couches de métallisation latérales (50) en direction des foyers linéaires (20) des surfaces cylindriques (46, 48). De préférence, le matériau de métallisation de la couche supérieure (46) et de la couche inférieure (48) du concentrateur est du saphir et le milieu laser à semi-conducteur dopé est Yb:YAG. Les couches de métallisation latérales (50) sont de préférence thermiquement isolantes, de façon à maintenir un flux thermique unidimensionnel avec le milieu laser. A cet effet, elles sont constituées d'un matériau ayant une conductivité thermique plus basse que le matériau utilisé pour les couches de métallisation supérieure (46) et inférieure (48). Les couches de métallisation latérales (50) sont de préférence constituées d'un matériau YAG non dopé.
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