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    • 1. 发明申请
    • Laser burst boosting method and apparatus
    • 激光脉冲升压方法和装置
    • US20060018350A1
    • 2006-01-26
    • US10896641
    • 2004-07-20
    • Frank AdamsMark ArboreWerner Wiechmann
    • Frank AdamsMark ArboreWerner Wiechmann
    • H01S3/04
    • H01S3/109H01S3/08072H01S3/094076H01S3/0941H01S3/1024H01S3/1028H01S5/06216H01S5/0622
    • Methods and apparatus for managing thermal loads on a laser gain medium and for boosting the output power of a diode pumped laser are disclosed. The short-term average pumping power to the gain medium is increased, to provide a burst of pumping energy to the laser gain medium. A subsequent short-term reduction in the average pumping power then allows the gain medium to cool to a desired state steady level. The average pumping power is then increased to maintain this steady state level until the next burst is desired. For example, a pulse of current may be applied to a laser diode at a first current level I1 for a first time interval Δt1, where I1 exceeds a nominal current value Inom by an amount ΔI1. The current to the laser diode is reduced to a second current level I2 for a second time interval Δt2, where Inom exceeds I2 by an amount ΔI2. To balance the thermal load on the diode an integral of ΔI1 over the time Δt1 is approximately equal in magnitude to an integral of ΔI2 over the time Δt2. After applying the pulse of current at the first current level I1, and before or after reducing the current to the second level I2, the nominal current is applied to the laser diode for a third time interval Δt3.
    • 公开了用于管理激光增益介质上的热负荷并用于提高二极管泵浦激光器的输出功率的方法和装置。 对增益介质的短期平均泵送功率增加,以向激光增益介质提供脉冲泵浦能量。 随后的平均泵浦功率的短期减少然后允许增益介质冷却到期望的状态稳定水平。 然后增加平均泵浦功率以保持该稳定状态水平,直到需要下一个爆发。 例如,电流脉冲可以在第一时间间隔Deltat 1 <1> 1处以第一电流电平I 1 1施加到激光二极管,其中I 1 < / SUB>超过额定电流值I> nom 一个数量ΔI1 <1。 在第二时间间隔Deltat2 <2>中,到激光二极管的电流减小到第二电流电平I 2 2,其中I>超过I < SUB> 2 数量ΔI2 2。 为了平衡二极管上的热负载,在时间上的ΔI1&lt; 1&lt; 1&lt; 1&lt; 1&lt; 1&lt; 1&lt; 1&lt; 1&lt; 1&gt;之间的积分大致等于DeltaI 2& 当时Deltat 2 。 在将电流施加到第一电流I I 1之后,并且在将电流减小到第二电平I 2 2之前或之后,将标称电流施加到激光器 二极管第三时间间隔Deltat 3
    • 6. 发明授权
    • Laser pump control for output power stabilization
    • 激光泵控制输出功率稳定
    • US5226051A
    • 1993-07-06
    • US710288
    • 1991-06-04
    • Melvin ChanHenry G. PlaessmanFrank AdamsWilliam M. Grossman
    • Melvin ChanHenry G. PlaessmanFrank AdamsWilliam M. Grossman
    • H01S3/0941H01S3/11H01S3/131H01S5/042
    • H01S3/115H01S3/0941H01S3/117H01S3/1312H01S5/042
    • Method and apparatus for stabilization of pulse energies produced by a continuously pumped, Q-switched, solid-state or gas laser, through control of the optical power delivered by an optical pump to the laser, in order to limit the energy emitted in any single laser pulse as a result of Q-switching. The laser pump is driven at full strength for a selected initial refresh time t.sub.r. If a Q-switch trigger signal is received by the laser before the elapsed time .DELTA.t has reached the refresh time t.sub.r, the laser emits a pulse with the reduced energy stored in the laser at that time. If the elapsed time reaches or exceeds the refresh time t.sub.r, the optical pump power subsequently delivered to the laser is reduced to a lower level, which may be time-dependent, that is sufficient to maintain the net energy stored in the laser at a predetermined value so that the energy in a subsequently emitted laser pulse does not exceed a selected limit. Numerous techniques for controlling the optical pump power delivered are disclosed.
    • 通过控制由光泵向激光器传递的光功率,通过连续泵浦,Q开关,固态或气体激光器产生的脉冲能量的稳定化方法和装置,以限制在任何单个 激光脉冲作为Q开关的结果。 激光泵以全强度驱动以选择初始刷新时间tr。 如果在经过时间DELTA t达到刷新时间tr之前由激光器接收到Q开关触发信号,那么激光器在那时发射存储在激光器中的能量减少的脉冲。 如果经过的时间达到或超过刷新时间tr,则随后输送到激光器的光泵浦功率被降低到较低的水平,其可能是时间依赖性的,其足以将存储在激光器中的净能量保持在预定的 使得随后发射的激光脉冲中的能量不超过选定的极限。 公开了用于控制递送的光泵功率的许多技术。
    • 9. 发明授权
    • Method for operating Q-switched lasers with intracavity frequency conversion
    • 用于操作具有腔内频率转换的Q开关激光器的方法
    • US06654391B2
    • 2003-11-25
    • US09823908
    • 2001-03-30
    • Frank Adams
    • Frank Adams
    • H01S310
    • H01S3/109H01S3/0809H01S3/1068H01S3/117H01S3/1305H01S3/1306
    • An intracavity frequency converted, Q-switched laser and method for operating such laser to obtain high output power in secondary pulses at a converted frequency. The secondary pulses are generated by a intracavity frequency conversion element from primary pulses at the fundamental wavelength. In accordance with the invention, after the primary and secondary pulses are generated the Q-switch is turned back on before the gain is fully depleted in the generation of the primary pulse. In particular, the Q-switch is turned back on such that a certain amount of energy of the primary pulse is retained in the laser, but late enough so that a majority of the secondary pulse is out-coupled from the laser. The Q-switched laser is well-suited for use at pulse repetition rates larger than 1/&tgr;, where &tgr; is an upper state lifetime (fluorescence lifetime) of the laser. Specifically, the laser can be operated at repetition rates of 10 kHz and higher, e.g., 30 kHz and higher to obtain significant increases in output power of the secondary pulses. Furthermore, the method and laser of the invention are compatible with various types of frequency conversion elements and processes including second harmonic generation, third harmonic generation, fourth harmonic generation, difference frequency generation, sum frequency generation, parametric amplification and parametric generation.
    • 腔内频率转换的Q开关激光器和用于操作这种激光器的方法,以在转换频率的二次脉冲中获得高输出功率。 二次脉冲由基波长的主脉冲的腔内频率转换元件产生。 根据本发明,在产生初级和次级脉冲之后,在增益在初级脉冲的产生中完全耗尽之前Q开关被重新导通。 特别地,Q开关被重新导通,使得初级脉冲的一定量的能量被保留在激光器中,但足够晚以致大部分次级脉冲从激光器外耦合。 Q开关激光器非常适合用于大于1 / tau的脉冲重复率,其中tau是激光器的上部状态寿命(荧光寿命)。 具体地,激光器可以以10kHz和更高,例如30kHz及更高​​的重复频率操作,以获得二次脉冲的输出功率的显着增加。 此外,本发明的方法和激光器与各种类型的变频元件兼容,包括二次谐波发生,三次谐波发生,四次谐波产生,差频产生,和频产生,参数放大和参数产生。