公开(公告)号：US20110103411A1

公开(公告)日：2011-05-05

申请号：US12917383

申请日：2010-11-01

申请人： C. Kumar N. Patel ,  Ilya Dunayevskiy ,  Manu Prasanna ,  Rowel C. Go ,  Alexei Tsekoun ,  Michael Pushkarsky ,  Richard Maulini

发明人： C. Kumar N. Patel ,  Ilya Dunayevskiy ,  Manu Prasanna ,  Rowel C. Go ,  Alexei Tsekoun ,  Michael Pushkarsky ,  Richard Maulini

IPC分类号： H01S3/10 ,  H01S3/098 ,  H01S3/13

CPC分类号： G01N21/1702 ,  B82Y20/00 ,  H01S5/06255 ,  H01S5/0654 ,  H01S5/1092 ,  H01S5/141 ,  H01S5/3401

摘要： Methods and apparatus for broad tuning of single wavelength quantum cascade lasers and the use of light output from such lasers for highly sensitive detection of trace gases such as nitrogen dioxide, acetylene, and vapors of explosives such as trinitrotoluene (TNT) and triacetone triperoxide (TATP) and TATP's precursors including acetone and hydrogen peroxide. These methods and apparatus are also suitable for high sensitivity, high selectivity detection of other chemical compounds including chemical warfare agents and toxic industrial chemicals. A quantum cascade laser (QCL) system that better achieves single mode, continuous, mode-hop free tuning for use in L-PAS (laser photoacoustic spectroscopy) by independently coordinating gain chip current, diffraction grating angle and external cavity length is described. An all mechanical method that achieves similar performance is also described. Additionally, methods for improving the sensor performance by critical selection of wavelengths are presented.

公开(公告)号：US20080159341A1

公开(公告)日：2008-07-03

申请号：US11821528

申请日：2007-06-22

申请人： C. Kumar N. Patel ,  Ilya Dunayevskiy ,  Manu Prasanna ,  Rowel C. Go ,  Alexei Tsekoun ,  Michael Pushkarsky ,  Richard Maulini

发明人： C. Kumar N. Patel ,  Ilya Dunayevskiy ,  Manu Prasanna ,  Rowel C. Go ,  Alexei Tsekoun ,  Michael Pushkarsky ,  Richard Maulini

IPC分类号： H01S3/10 ,  H01S3/108 ,  G01N21/00 ,  H01S3/104

CPC分类号： G01N21/1702 ,  B82Y20/00 ,  H01S5/06255 ,  H01S5/0654 ,  H01S5/1092 ,  H01S5/141 ,  H01S5/3401

摘要： Methods and apparatus for broad tuning of single wavelength quantum cascade lasers and the use of light output from such lasers for highly sensitive detection of trace gases such as nitrogen dioxide, acetylene, and vapors of explosives such as trinitrotoluene (TNT) and triacetone triperoxide (TATP) and TATP's precursors including acetone and hydrogen peroxide. These methods and apparatus are also suitable for high sensitivity, high selectivity detection of other chemical compounds including chemical warfare agents and toxic industrial chemicals. A quantum cascade laser (QCL) system that better achieves single mode, continuous, mode-hop free tuning for use in L-PAS (laser photoacoustic spectroscopy) by independently coordinating gain chip current, diffraction grating angle and external cavity length is described. An all mechanical method that achieves similar performance is also described. Additionally, methods for improving the sensor performance by critical selection of wavelengths are presented.

摘要翻译： 用于单波长量子级联激光器的广泛调谐的方法和装置以及来自这种激光器的光输出的用途用于高灵敏度检测痕量气体如二氧化氮，乙炔和诸如三硝基甲苯（TNT）和三丙酮三过氧化物（TATP）的爆炸物的蒸气 ）和TATP的前体，包括丙酮和过氧化氢。 这些方法和装置也适用于其他化学化合物（包括化学战剂和有毒工业化学品）的高灵敏度，高选择性检测。 描述了通过独立协调增益芯片电流，衍射光栅角度和外部腔长度，更好地实现用于L-PAS（激光光声光谱）的单模，连续，无跳跃自由调谐的量子级联激光器（QCL）系统。 还描述了实现类似性能的全部机械方法。 另外，提出了通过关键选择波长来提高传感器性能的方法。

公开(公告)号：US20110103412A1

公开(公告)日：2011-05-05

申请号：US12917406

申请日：2010-11-01

申请人： C. Kumar N. Patel ,  Ilya Dunayevskiy ,  Manu Prasanna ,  Rowel C. Go ,  Alexei Tsekoun ,  Michael Pushkarsky ,  Richard Maulini

发明人： C. Kumar N. Patel ,  Ilya Dunayevskiy ,  Manu Prasanna ,  Rowel C. Go ,  Alexei Tsekoun ,  Michael Pushkarsky ,  Richard Maulini

IPC分类号： H01S3/10

CPC分类号： G01N21/1702 ,  B82Y20/00 ,  H01S5/06255 ,  H01S5/0654 ,  H01S5/1092 ,  H01S5/141 ,  H01S5/3401

摘要： Methods and apparatus for broad tuning of single wavelength quantum cascade lasers and the use of light output from such lasers for highly sensitive detection of trace gases such as nitrogen dioxide, acetylene, and vapors of explosives such as trinitrotoluene (TNT) and triacetone triperoxide (TATP) and TATP's precursors including acetone and hydrogen peroxide. These methods and apparatus are also suitable for high sensitivity, high selectivity detection of other chemical compounds including chemical warfare agents and toxic industrial chemicals. A quantum cascade laser (QCL) system that better achieves single mode, continuous, mode-hop free tuning for use in L-PAS (laser photoacoustic spectroscopy) by independently coordinating gain chip current, diffraction grating angle and external cavity length is described. An all mechanical method that achieves similar performance is also described. Additionally, methods for improving the sensor performance by critical selection of wavelengths are presented.

公开(公告)号：US20110102788A1

公开(公告)日：2011-05-05

申请号：US12917399

申请日：2010-11-01

申请人： C. Kumar N. Patel ,  IIya Dunayevskiy ,  Manu Prasanna ,  Rowel C. Go ,  Alexei Tsekoun ,  Michael Pushkarsky ,  Richard Maulini

发明人： C. Kumar N. Patel ,  IIya Dunayevskiy ,  Manu Prasanna ,  Rowel C. Go ,  Alexei Tsekoun ,  Michael Pushkarsky ,  Richard Maulini

IPC分类号： G01J3/30 ,  G01J3/00

CPC分类号： G01N21/1702 ,  B82Y20/00 ,  H01S5/06255 ,  H01S5/0654 ,  H01S5/1092 ,  H01S5/141 ,  H01S5/3401

摘要： Methods and apparatus for broad tuning of single wavelength quantum cascade lasers and the use of light output from such lasers for highly sensitive detection of trace gases such as nitrogen dioxide, acetylene, and vapors of explosives such as trinitrotoluene (TNT) and triacetone triperoxide (TATP) and TATP's precursors including acetone and hydrogen peroxide. These methods and apparatus are also suitable for high sensitivity, high selectivity detection of other chemical compounds including chemical warfare agents and toxic industrial chemicals. A quantum cascade laser (QCL) system that better achieves single mode, continuous, mode-hop free tuning for use in L-PAS (laser photoacoustic spectroscopy) by independently coordinating gain chip current, diffraction grating angle and external cavity length is described. An all mechanical method that achieves similar performance is also described. Additionally, methods for improving the sensor performance by critical selection of wavelengths are presented.

公开(公告)号：US20100046568A1

公开(公告)日：2010-02-25

申请号：US12518565

申请日：2007-11-20

申请人： Richard Maulini ,  Stephane Blaser ,  Jerome Faist

发明人： Richard Maulini ,  Stephane Blaser ,  Jerome Faist

IPC分类号： H01S5/028

CPC分类号： G02B1/115 ,  B82Y20/00 ,  H01S5/028 ,  H01S5/3401

摘要： A quantic cascade laser amplifier (12) having an active zone (20) includes a stack of raw layers of semi-conductor materials formed in an epitaxial manner on a substrate layer (16) of indium phosphide (InP) or gallium arsenide (GaAs) bearing the active zone (20), and a vertical anti-reflection coating (34) that covers an outlet face (28) of the laser radiation made of materials having given refraction indices and a predetermined thickness so that the entire laser radiation can flow through the outlet face. The anti-reflection coating (34) includes a first layer (36) having a first predetermined refraction index (n1) lower than the predetermined refraction index (nD), and at least a second layer (38) having a second refraction index (n2) higher than the predetermined refraction index (nD), characterised in that the first layer (36) of the anti-reflection coating (34) is made of yttrium fluoride (YF3).

摘要翻译： 具有有源区（20）的量子级联激光放大器（12）包括在铟磷化物（InP）或砷化镓（GaAs）的衬底层（16）上以外延形式形成的半导体材料的原始层堆叠， 承载有源区（20）和垂直防反射涂层（34），其覆盖由具有给定折射率和预定厚度的材料制成的激光辐射的出口面（28），使得整个激光辐射可以流过 出口面。 防反射涂层（34）包括具有低于预定折射率（nD）的第一预定折射率（n1）的第一层（36）和至少具有第二折射率（n2）的第二层（38） ），其特征在于防反射涂层（34）的第一层（36）由氟化钇（YF 3）制成。

公开(公告)号：US07944959B2

公开(公告)日：2011-05-17

申请号：US12518565

申请日：2007-11-20

申请人： Richard Maulini ,  Stephane Blaser ,  Jerome Faist

发明人： Richard Maulini ,  Stephane Blaser ,  Jerome Faist

IPC分类号： H01S3/30 ,  H01S5/00

CPC分类号： G02B1/115 ,  B82Y20/00 ,  H01S5/028 ,  H01S5/3401

摘要： A quantum cascade laser amplifier (12) having an active zone (20) includes a stack of raw layers of semi-conductor materials formed in an epitaxial manner on a substrate layer (16) of indium. phosphide (InP) or gallium arsenide (GaAs) bearing the active zone (20), and a vertical anti-reflection coating (34) that covers an outlet face (28) of the laser radiation made of materials having given refraction indices and a predetermined thickness so that the entire laser radiation can flow through the outlet face. The anti-reflection coating (34) includes a first layer (36) having a first predetermined retraction index (n1) lower than the predetermined refraction index (nD), and at least a second layer (38) having a second refraction index (n2) higher than the predetermined refraction index (nD), wherein the first layer (36) of the anti-reflection coating (34) is made of yttrium fluoride (YF3).

摘要翻译： 具有有源区（20）的量子级联激光放大器（12）包括在铟的衬底层（16）上以外延方式形成的半导体材料的原始层叠层。 具有活性区域（20）的磷化物（InP）或砷化镓（GaAs）和覆盖由具有给定折射率的材料制成的激光辐射的出口面（28）的垂直防反射涂层（34） 使得整个激光辐射能够流过出口面。 防反射涂层（34）包括具有低于预定折射率（nD）的第一预定缩回指数（n1）的第一层（36）和至少具有第二折射率（n2）的第二层（38） ），其中抗反射涂层（34）的第一层（36）由氟化钇（YF 3）制成。