公开(公告)号：EP0715774A1

公开(公告)日：1996-06-12

申请号：EP94931738.0

申请日：1994-08-22

申请人： LASER POWER CORPORATION

发明人： HARGIS, David, E. ,  NELTE, Sven, E.

IPC分类号： G02F1 ,  H01S3

CPC分类号： H01S3/0627 ,  H01S3/0405 ,  H01S3/0602 ,  H01S3/0604 ,  H01S3/0612 ,  H01S3/0615 ,  H01S3/07 ,  H01S3/0809 ,  H01S3/09415 ,  H01S3/109 ,  H01S3/1611 ,  H01S3/1671 ,  H01S2302/00 ,  H01S2303/00

摘要： A monolithic diode pumped solid-state laser (11) comprising as the laser host neodymium-doped yttrium orthovanadate (Nd:YVO4) (12, 52) or neodymium-doped gadolinium orthovanadate (Nd:GdVO4) (57, 67) operating on the 4F3/2 → 4I9/2 (∩914 nm or ∩912 nm respectively) transition, to which a suitable nonlinear optic material (16), such as potassium niobate (KNbO3) or beta barium borate (BBO), is bonded. The nonlinear crystal gives rise to intracavity frequency doubling to ∩457 or ∩456 nm. The microlaser is a composite cavity formed form a gain medium crystal and a nonlinear frequency doubling material which together have four spaced parallel dielectrically coated faces (14, 17, 18, 15) and which is positioned in close proximity to a diode laser pump source (13) for phase-matched harmonic generation of blue light along an axis of propagation which lies substantially perpendicular to the two faces of the composite cavity. By employing specific doping concentration-length products of lasant material and pumping the gain medium which has a specific crystalline orientation the desired efficient blue microlaser is achieved. Alternative embodiments combine the Nd:YVO4 and Nd:GdVO4 elements to enhance certain output characteristics of the laser.

摘要翻译： 一种单片二极管泵浦固态激光器（11），包括作为激光器主体的钕掺杂原钒酸钇（Nd：YVO 4）（12,52）或钕掺杂钒酸钆（Nd：GdVO 4）（57,67） 4F3 / 2→4I9 / 2（分别为914nm或912nm）跃迁，将合适的非线性光学材料（16），例如铌酸钾（KNbO3）或硼酸钡（BBO）粘合到其上。 非线性晶体可使腔内倍频达到∩457或∩456nm。 微激光器是由增益介质晶体和非线性倍频材料形成的复合腔体，它们一起具有四个间隔开的平行介电涂覆面（14,17,18,15），并且其定位成非常靠近二极管激光泵浦源（ 用于沿着基本上垂直于复合腔的两个面的传播轴的蓝光的相位匹配谐波产生。 通过采用特定掺杂浓度长度的稀土材料产品并泵送具有特定晶体取向的增益介质，实现了所需的高效蓝色微激光器。 备选实施例组合Nd：YVO 4和Nd：GdVO 4元件以增强激光器的某些输出特性。

公开(公告)号：EP0958519A1

公开(公告)日：1999-11-24

申请号：EP98901842.0

申请日：1998-01-21

申请人： LASER POWER CORPORATION

发明人： HARGIS, David, E.

IPC分类号： G02B6

CPC分类号： G02B6/4249 ,  G02B6/04 ,  G02B6/3812 ,  G02B6/4216 ,  H01S5/4012

摘要： An optical fiber coupling assembly for substantially preserving polarization of transmitted optical radiation, including at least one multimode optical fiber (100) situated in a housing (105) that includes means for distributing pressure on the optical fiber and reducing stress on the multimode optical fiber. In one embodiment, the housing has a first (110) and a second side (120), and includes a channel (430) having a first end opening on the first side and a second end within the housing. A cavity (420) connected to the second end of the channel is formed within the housing. An aperture (410) formed in the housing connects the cavity to the second side. The channel, cavity, and aperture together provide a passageway for the optical fibers from the first side to the second side of the housing. In the preferred embodiment, the aperture bundles a plurality of fibers together in an approximately circular cross section. A laser such as a laser diode or laser diode array (500) provides substantially polarized optical radiation that is coupled into a first end of the optical fibers. The optical radiation transmitted through the housing is outputted from the second side having substantially preserved polarization from the bundled second ends to provide a collective output beam having a substantially single polarization. The collective output beam is useful for pumping a solid state laser (510). The polarization preservation between the first and second ends may be greater than 70 %, and in some embodiments greater than 90 %.

公开(公告)号：EP0943167A1

公开(公告)日：1999-09-22

申请号：EP97951542.0

申请日：1997-11-26

申请人： LASER POWER CORPORATION

发明人： HARGIS, David, E. ,  NELTE, Sven, E.

IPC分类号： H01S3

CPC分类号： H01S3/042 ,  G02F2001/3503 ,  H01S3/0405 ,  H01S3/0602 ,  H01S3/0612 ,  H01S3/0627 ,  H01S3/0815 ,  H01S3/0816 ,  H01S3/082 ,  H01S3/09415 ,  H01S3/109 ,  H01S3/1611 ,  H01S3/1671 ,  H01S3/1673 ,  H01S2302/00 ,  H01S2303/00

摘要： An intracavity frequency-converted laser having an intracavity reflector situated to reflect converted radiation at a nonzero angle with respect to the optical axis. The laser includes an optical cavity (40) that defines an optical axis, a gain medium (46) for providing a fundamental laser emission, a pump source (60) for pumping the gain medium, and a nonlinear material (62) for frequency converting the fundamental laser emission to provide first and second converted beams that propagate in opposite directions within the optical cavity. An angled reflector (70) that reflects optical radiation at the converted wavelength, but is transmissive at the fundamental wavelength is situated within the optical cavity to reflect one of the converted beams along a path angled with respect to the optical axis. Reflecting the converted radiation before it propagates through the gain medium avoids absorption losses. Furthermore, interference between the reflected beam and other converted beam is avoided due to the angle of reflection.

公开(公告)号：EP0715774B1

公开(公告)日：2000-05-17

申请号：EP94931738.2

申请日：1994-08-22

申请人： LASER POWER CORPORATION

发明人： HARGIS, David, E. ,  NELTE, Sven, E.

IPC分类号： H01S3/109 ,  H01S3/06 ,  H01S3/16

CPC分类号： H01S3/0627 ,  H01S3/0405 ,  H01S3/0602 ,  H01S3/0604 ,  H01S3/0612 ,  H01S3/0615 ,  H01S3/07 ,  H01S3/0809 ,  H01S3/09415 ,  H01S3/109 ,  H01S3/1611 ,  H01S3/1671 ,  H01S2302/00 ,  H01S2303/00

摘要： A monolithic diode pumped solid-state laser (11) comprising as the laser host neodymium-doped yttrium orthovanadate (Nd:YVO4) (12, 52) or neodymium-doped gadolinium orthovanadate (Nd:GdVO4) (57, 67) operating on the 4F3/2 → 4I9/2 (∩914 nm or ∩912 nm respectively) transition, to which a suitable nonlinear optic material (16), such as potassium niobate (KNbO3) or beta barium borate (BBO), is bonded. The nonlinear crystal gives rise to intracavity frequency doubling to ∩457 or ∩456 nm. The microlaser is a composite cavity formed form a gain medium crystal and a nonlinear frequency doubling material which together have four spaced parallel dielectrically coated faces (14, 17, 18, 15) and which is positioned in close proximity to a diode laser pump source (13) for phase-matched harmonic generation of blue light along an axis of propagation which lies substantially perpendicular to the two faces of the composite cavity. By employing specific doping concentration-length products of lasant material and pumping the gain medium which has a specific crystalline orientation the desired efficient blue microlaser is achieved. Alternative embodiments combine the Nd:YVO4 and Nd:GdVO4 elements to enhance certain output characteristics of the laser.

公开(公告)号：EP0953220A1

公开(公告)日：1999-11-03

申请号：EP97953214.0

申请日：1997-12-12

申请人： LASER POWER CORPORATION

发明人： HARGIS, David, E. ,  NELTE, Sven, E.

IPC分类号： H01S3

CPC分类号： H01S3/0627 ,  G02F2001/3503 ,  H01S3/025 ,  H01S3/0401 ,  H01S3/0405 ,  H01S3/042 ,  H01S3/0602 ,  H01S3/0604 ,  H01S3/0612 ,  H01S3/0815 ,  H01S3/0816 ,  H01S3/082 ,  H01S3/09415 ,  H01S3/109 ,  H01S3/1611 ,  H01S3/1671 ,  H01S3/1673 ,  H01S2302/00 ,  H01S2303/00

摘要： A longitudinally-cooled laser element assembly comprises an optically transparent heat sink (OTH) (110, 120) coupled to a laser element (100) and a heat sink (130, 140). An etalon structure including a first flat surface and a second, substantially parallel flat surface is formed in the laser element and/or the OTH. In some embodiments, a balanced etalon is provided by forming a reflector on the second flat surface (107) of the etalon that has a reflectivity approximately equal to the Fresnel loss at the interface between the OTH and the laser element. In some embodiments the laser element assembly includes a second OTH (120) coupled to the laser element at a second interface, thereby defining a second Fresnel loss. Preferably, the second OTH has an index of refraction substantially equal to the index of refraction of the first OTH, so that said first and second Fresnel losses are approximately equal and a balanced etalon is formed. In some embodiments the laser element comprises a solid-state gain medium. In other embodiments the laser element comprises a nonlinear frequency conversion crystal. An intracavity frequency-converted laser is described in which OTHs are used to cool both the gain medium and the nonlinear material.

公开(公告)号：EP0722646A1

公开(公告)日：1996-07-24

申请号：EP94930004.0

申请日：1994-09-30

申请人： LASER POWER CORPORATION

发明人： HARGIS, David, E. ,  FLINT, Graham ,  ASSA, Shlomo

IPC分类号： G02B26 ,  G02B27 ,  G02F1 ,  G03B21 ,  H01S5 ,  H04N9

CPC分类号： H04N9/3132

摘要： An image projection system employing microlaser and/or diode laser arrays (11). Each laser in each array is individually addressable. The system includes three linear laser arrays, one red (12), one green (13), and one blue (14), each individually addressable laser being powered and modulated in accordance with the input image signal (21). When microlaser arrays, which are energized by laser diode pumps, are used, the laser diode pumps are formed in equivalent arrays (15, 16, 17). The laser output beams are combined in a dichroic prism (31) and reflected off a rotating multifaceted scanning mirror (22) which effects two dimensional scanning as it rotates. The image beam reflected from the scanner passes through an imaging lens (24), a speckle eliminator (25) and then onto the projection screen (27). The invention also includes the method of generating and scanning the image beam, as well as the novel speckle eliminator and the microlaser array configured for optimally close spacing to achieve the desired result. In one embodiment, the laser diode pumps are directly modulated by the video signal, while in another embodiment the microlaser outputs are modulated utilizing a spatial light modulator array.