CN102201645A - 用于操作二极管激光器的方法 - Google Patents

用于操作二极管激光器的方法 Download PDF

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CN102201645A
CN102201645A CN2011100808471A CN201110080847A CN102201645A CN 102201645 A CN102201645 A CN 102201645A CN 2011100808471 A CN2011100808471 A CN 2011100808471A CN 201110080847 A CN201110080847 A CN 201110080847A CN 102201645 A CN102201645 A CN 102201645A
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biasing
combination drive
threshold value
diode laser
mixing control
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D·V·库科森克夫
S·李
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Corning Inc
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
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    • A61F11/20—Ear surgery
    • A61F11/202—Surgical middle-ear ventilation or drainage, e.g. permanent; Implants therefor
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/0601—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium comprising an absorbing region
    • H01S5/0602—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium comprising an absorbing region which is an umpumped part of the active layer
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/0625—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in multi-section lasers
    • H01S5/06251—Amplitude modulation
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/0625—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in multi-section lasers
    • H01S5/06255—Controlling the frequency of the radiation
    • H01S5/06256—Controlling the frequency of the radiation with DBR-structure

Abstract

提供一种用于操作二极管激光器的方法。根据一种方法，二极管激光器包括波长选择部分、增益部分和饱和吸收器。该方法包括向饱和吸收器施加包含混合控制DC偏置的混合控制信号，以及向增益部分施加包含混合驱动DC偏置和混合驱动AC偏置的混合驱动信号。选择混合信号被并且配置二极管激光器以使得相对较高的混合控制DC偏置对应于二极管激光器的相对较低的输出功率平均值并且相对较低的混合控制DC偏置对应于二极管激光器的相对较高的输出功率平均值。混合驱动DC偏置在二极管激光器的接通阈值与二极管激光器的切断阈值之间，并且混合驱动AC偏置是周期性的。混合驱动AC偏置具有大于接通阈值与切断阈值之差的峰到峰振幅。

Description

用于操作二极管激光器的方法
本申请要求2010年3月24日提交的美国申请No.12/730,482的优先权。
背景技术
本公开涉及操作激光器的方法，尤其涉及用于操作DBR二极管激光器的方法。
发明内容
根据一个实施例，提供一种用于操作二极管激光器的方法。根据该方法，二极管激光器包括波长选择部分、增益部分和饱和吸收器。该方法包括向饱和吸收器施加包含混合控制DC偏置的混合控制信号，以及向增益部分施加包含混合驱动DC偏置和混合驱动AC偏置的混合驱动信号。选择混合信号并且配置二极管激光器以使得相对较高的混合控制DC偏置对应于二极管激光器的相对较低的输出功率平均值并且相对较低的混合控制DC偏置对应于二极管激光器的相对较高的输出功率平均值。混合驱动DC偏置在二极管激光器的接通阈值与二极管激光器的切断阈值之间，并且混合驱动AC偏置是周期性的。混合驱动AC偏置具有大于接通阈值与切断阈值之差的峰到峰振幅。
揭示并要求保护其它实施例。
附图说明
本公开的特定实施例的以下详细描述可以在结合以下附图阅读的情况下被最好地理解，其中使用相似的附图标记表示相似的结构，在附图中：
图1是用于操作DBR二极管激光器的方法实施例的示意图；
图2是二极管激光器的输出功率与施加到二极管激光器增益部分的电流之间的关系以及施加到增益部分的电流随时间的曲线图。
图3A是二极管激光器输出功率随时间的曲线图；
图3B是二极管激光器输出功率随时间的曲线图；
图4是两部分DBR二极管激光器的示意图；
图5是用于操作DBR二极管激光器的方法的实施例的示意图；以及
图6是二极管激光器的输出功率与施加到二极管激光器增益部分的电流之间的关系以及施加到增益部分的电流随时间的曲线图。
具体实施方式
为了描述和定义本公开，应该注意，术语“混合”是以整体方式使用的，是指使用异类元素形成本公开的复合方法。因此，当信号被描述为“混合”时，这表示该信号是用于操作二极管激光器10的方法的元素。此外，应该注意，当描述电子设备的操作或控制时，诸如电流、电压等的电学量可以很容易地互换使用。因此，当电学量在本文中被描述为电流时，这些描述主要是为了清楚，本公开不应该如此受限。
在图1中示出了根据本公开一个实施例的用于操作二极管激光器10的方法。如图1所示的二极管激光器10包括波长选择部分102、增益部分104和饱和吸收器106。根据该方法，混合控制信号110和混合驱动信号120被施加到二极管激光器100。示出为被施加到饱和吸收器106的电流(ISA)的混合控制信号110包括混合控制DC偏置112。类似地，包括混合驱动DC偏置122和混合驱动AC偏置124的混合驱动信号120被施加到增益部分104。选择混合信号110和120并且配置二极管激光器100以使得相对较高的混合控制DC偏置112对应于二极管激光器100的相对较低的输出功率130平均值。同时，相对较低的混合控制DC偏置112对应于二极管激光器100的相对较高的输出功率130平均值。下文中会更加详细地描述混合驱动信号120。
现在参照图2，示出输出功率130(P输出)相关于施加到增益部分的电流(I增益)，以及施加到增益部分的电流(I增益)随时间(t)的变化，可以观察到混合驱动信号120的详细情况。如上文所述，混合驱动信号120包括混合驱动DC偏置122和混合驱动AC偏置124。混合驱动DC偏置122在二极管激光器100的接通阈值132与二极管激光器100的切断阈值134之间。此外，混合驱动AC偏置124是周期性的，其中峰到峰振幅大于接通阈值132与切断阈值134之差。因此，例如，当混合驱动信号120是电流时，安培数随时间在大于接通阈值132的最大值与小于切断阈值134的最小值之间变化。
为了描述和定义本公开，如本文所使用的术语“接通阈值”表示需要被施加到二极管激光器100增益部分104以将二极管激光器100从超发光态转换成激射态的电信号的量。例如，如图2所示，当施加到增益部分的电流(I增益)增大超过接通阈值132时，激光器通过突发输出光功率跳跃136从超发光态突发转化成激射态。仍然参照图2，当施加到增益部分的电流(I增益)减小到低于切断阈值134时，激光器通过突发输出光功率下降138从激射态突发切换到超发光态。
在本公开的一实施例中，混合驱动信号120在混合驱动信号126的负半周期期间到达低于切断阈值134之下的值。而且，混合驱动信号120在混合驱动信号128的正半周期期间到达接通阈值132之上的值。在该方法的其它实施例中，混合驱动信号120包括在接通阈值132和切断阈值134的平均值的约+/-50％之内的混合驱动DC偏置122。在其它实施例中，混合驱动DC偏置122约等于接通阈值132和切断阈值134的平均值。在另外的实施例中，混合驱动AC偏置124是正弦的。然而，虽然某些实施例包括正弦周期信号，但应该理解，本公开预期使用各类周期性信号，诸如方波、三角波、脉冲信号、不规则信号等等。
现在参照图3A和3B，在用于操作二极管激光器10的方法的一实施例中，在混合驱动信号120的每一个周期中，混合驱动信号120在一短暂持续时间(t短)中位于接通阈值132之上，由此形成了无肩的输出光脉冲140。从图2可见，t短对应于小于混合驱动信号120周期的时段。例如，当混合驱动信号120具有约0.5GHz至约2.0GHz范围内的频率时，t短可以在约200ps至50ps范围内。应该注意，在前描述的t短的值主要旨在演示t短小于混合驱动信号120的周期，因此不应该被解读为对本公开的限制。再次参照图3B，当混合驱动信号120向二极管激光器100中注入的载荷子(电子和空穴)的数目超过在第一弛豫振荡峰期间消除的载荷子的数目时，可以形成肩142。例如，当t短或混合驱动信号120的振幅过大时，二极管激光器100发射超过第一弛豫振荡峰，诸如：第二弛豫振荡峰、第三弛豫振荡峰等等。
参照图1和4，描述本公开的附加实施例。在一个实施例中，二极管激光器100(图4)是DBR激光器，包括两部分，诸如但不限于，波长选择部分102和增益部分104。饱和吸收器106(未在图4中示出)可以是波长选择部分102和增益部分104的任何一个或两者的一部分。在另一实施例中，二极管激光器100(图1)是三部分DBR激光器，包括工作为饱和吸收器106的相位部分108。在某些实施例中，饱和吸收器106被设置在波长选择部分102与增益部分104之间。在其它实施例中，二极管激光器100被构造成使得增益部分104被设置在波长选择部分102与饱和吸收器106之间。
再次参照图1，在用于操作二极管激光器10的方法的附加实施例中，混合控制DC偏置112在饱和吸收器阈值116之下。例如，当相位部分108是活性的(具有掺杂)时，通过施加位于饱和吸收器阈值116之下的混合控制DC偏置112(即，在饱和吸收器阈值之下的正电流、零电流或负电流)，相位部分108可以工作为饱和吸收器106。相反，通过施加正的且在饱和吸收器阈值116之上的混合控制DC偏置112，相位部分108可以工作为放大器。
本公开的其它实施例包括通过改变混合控制DC偏置112的振幅来改变二极管激光器100的输出功率130平均值。某些实施例包括改变混合驱动信号120，其中混合驱动DC偏置122的振幅变化与混合驱动AC偏置124的峰到峰振幅变化大致成比例。在诸如(但不限于)扫描激光投影仪的光源的实施例中，根据查找表或者动态地改变混合驱动信号120。
现在参照图5和6，可以看出，在附加实施例中，混合控制信号110包括周期性且具有与混合驱动AC偏置124大致相同频率的混合控制AC偏置114。在其它实施例中，混合控制AC偏置114与混合驱动AC偏置124相一致，使得二极管激光器100的接通阈值132在混合驱动信号128的正半周期期间较低144(被示为I增益相对于时间增大之处的正弦信号部分)，并且激光二极管100的切断阈值134在混合驱动信号126的负半周期期间较高146(被示为I增益在相对于时间减小之处的正弦信号部分)。在该方法的某些实施例中，混合控制AC偏置114与混合驱动AC偏置124同相。例如，偏置114与124之间的相位差约为2nπ，其中n是整数。
在另外的实施例中，如图6所示，混合控制AC偏置114(未示出)具有峰到峰振幅，使得接通阈值132和切断阈值134在彼此的约+/-10％之内。在该方法的附加实施例中，混合控制AC偏置114具有峰到峰振幅，使得接通阈值132和切断阈值134大致相等。
现在再次参照图5和6，一实施例包括改变输出功率130的平均值，其中混合控制AC偏置114具有峰到峰振幅，使得接通阈值132和切断阈值134在彼此的约+/-10％之内。在附加实施例中，混合驱动AC偏置124的峰到峰振幅保持恒定，并且混合驱动DC偏置122约等于接通阈值132或切断阈值134。在其它实施例中，混合驱动AC偏置124的峰到峰振幅和混合控制AC偏置114的峰到峰振幅保持恒定，而改变混合驱动DC偏置122和混合控制DC偏置112以改变输出功率130的平均值。在诸如(但不限于)扫描激光投影仪的激光光源的实施例中，例如通过使用来自监视器光电二极管的电子反馈，根据查找表或动态地改变混合驱动DC偏置和混合控制DC偏置。
为了描述和定义本公开，应该注意，“信号”是指电荷、电磁辐射等的量。此外，术语“施加”、“被施加”以及其它动词形式被用来指代电荷、电磁辐射等的转移。因此，当向激光器的一部分施加信号时，会将诸如电荷从信号源转移到该部分。
应该注意，本文中采用术语“约(大致)”来表示可归因于任何定量比较、值、测量、或其它表示的固有的不确定性。本文还采用术语“约(大致)”来表示一定量表示从规定参考值的变化程度，但不会在此问题上导致本发明主题的基本功能改变。
对本领域技术人员显而易见的是，可以在不背离要求保护主题的精神和范围的情况下对本文所述实施例作出各种修改和变化。因而，本说明书旨在涵盖本文所述各种实施例的修改和变型，只要这种修改和变形落在所附权利要求及其等效技术方案的范围中。
应该注意，所附权利要求的一个或多个采用术语“其中”作为过渡短语。为了定义本发明，应该注意，该术语作为开放性过渡短语引入到权利要求中，用于引入对一系列技术特征的陈述并且应该以与更普遍使用的开放前导术语“包括”相类似的方式来解释。

Claims (20)

1.一种用于操作二极管激光器的方法，其中所述二极管激光器包括波长选择部分、增益部分和饱和吸收器，所述方法包括：
向所述饱和吸收器施加包括混合控制DC偏置的混合控制信号；以及
向所述增益部分施加包括混合驱动DC偏置和混合驱动AC偏置的混合驱动信号，其中选择所述混合信号并且配置所述二极管激光器以使得：
相对较高的混合控制DC偏置对应于所述二极管激光器的相对较低的输出功率平均值；
相对较低的混合控制DC偏置对应于所述二极管激光器的相对较高的输出功率平均值；
所述混合驱动DC偏置在所述二极管激光器的接通阈值与所述二极管激光器的切断阈值之间；
所述混合驱动AC偏置是周期性的；以及
所述混合驱动AC偏置具有大于所述接通阈值与所述切断阈值之差的峰到峰振幅。
2.如权利要求1所述的方法，其特征在于，所述混合驱动信号在所述混合驱动信号的负半周期期间到达在所述切断阈值之下的值，并且所述混合驱动信号在所述混合驱动信号的正半周期期间到达在所述接通阈值之上的值。
3.如权利要求2所述的方法，其特征在于，所述混合驱动DC偏置在所述接通阈值和所述切断阈值的平均值的约+/-50％之内。
4.如权利要求2所述的方法，其特征在于，所述混合驱动信号向所述二极管激光器中注入的载荷子总数从而形成无肩输出光脉冲。
5.如权利要求1所述的方法，其特征在于，所述二极管激光器是包括两部分的DBR激光器。
6.如权利要求1所述的方法，其特征在于，所述二极管激光器是三部分DBR激光器，包括工作为所述饱和吸收器的相位部分。
7.如权利要求1所述的方法，其特征在于，所述混合控制DC偏置在饱和吸收器阈值之下。
8.如权利要求1所述的方法，还包括通过改变所述混合控制DC偏置的振幅来改变所述二极管激光器的输出功率平均值。
9.如权利要求8所述的方法，还包括改变所述混合驱动信号，其中所述混合驱动DC偏置的振幅变化与所述混合驱动AC偏置的峰到峰振幅变化大致成比例。
10.如权利要求9所述的方法，其特征在于，根据查找表或者动态地改变所述混合驱动信号。
11.如权利要求1所述的方法，其特征在于：
所述混合控制信号还包括混合控制AC偏置；以及
所述混合控制AC偏置是周期性的并且具有与所述混合驱动AC偏置大致相同的频率。
12.如权利要求11所述的方法，其特征在于，所述混合控制AC偏置与所述混合驱动AC偏置相对应，使得所述二极管激光器的接通阈值在所述混合驱动信号的正半周期期间较低并且所述激光二极管的切断阈值在所述混合驱动信号的负半周期中较高。
13.如权利要求12所述的方法，其特征在于，所述混合控制AC偏置与所述混合驱动AC偏置同相。
14.如权利要求11所述的方法，其特征在于，所述混合控制AC偏置具有峰到峰振幅，使得所述接通阈值和所述切断阈值在彼此的约+/-10％之内。
15.如权利要求14所述的方法，其特征在于，所述混合控制AC偏置具有峰到峰振幅，使得所述接通阈值和所述切断阈值彼此大致相等。
16.如权利要求11所述的方法，还包括改变平均输出功率，其中所述混合控制AC偏置具有峰到峰振幅使得所述接通阈值和所述切断阈值在彼此的约+/-10％之内。
17.如权利要求16所述的方法，其特征在于：
所述混合驱动AC偏置的峰到峰振幅保持恒定；以及
所述混合驱动DC偏置约等于所述接通阈值或所述切断阈值。
18.如权利要求16所述的方法，其特征在于：
所述混合驱动AC偏置的峰到峰振幅和所述混合控制AC偏置的峰到峰振幅保持恒定；以及
所述混合驱动DC偏置和所述混合控制DC偏置被改变。
19.如权利要求18所述的方法，其特征在于，根据查找表或者动态地改变所述混合驱动DC偏置和所述混合控制DC偏置。
20.一种用于操作二极管激光器的方法，其中所述二极管激光器包括波长选择部分、增益部分和工作为饱和吸收器的相位部分，所述方法包括：
向所述饱和吸收器施加包括混合控制DC偏置或混合控制DC偏置和混合控制AC偏置的混合控制信号；以及
向所述增益部分施加包括混合驱动DC偏置和混合驱动AC偏置的混合驱动信号，其中选择所述混合信号并且配置所述二极管激光器以使得：
相对较高的混合控制DC偏置对应于所述二极管激光器的相对较低的输出功率平均值；
相对较低的混合控制DC偏置对应于所述二极管激光器的相对较高的输出功率平均值；
所述混合控制DC偏置在饱和吸收器阈值之下；
所述混合驱动DC偏置在所述二极管激光器的接通阈值与所述二极管激光器的切断阈值之间；
所述混合驱动AC偏置是周期性的；
所述混合驱动AC偏置具有大于所述接通阈值与所述切断阈值之差的峰到峰振幅；
所述混合驱动信号在所述混合驱动信号的负半周期期间到达所述切断阈值之下的值；以及
所述混合驱动信号在所述混合驱动信号的正半周期期间到达所述接通阈值之上的值。
CN2011100808471A 2010-03-24 2011-03-23 用于操作二极管激光器的方法 Pending CN102201645A (zh)

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Application publication date: 20110928