可与固体激光器性能相媲美的陶瓷激光器

激光陶瓷是一种由细小、紧密填充的晶粒构成的马赛克结构。该材料除具有陶瓷的多晶体性质外，采用烧结方法制备的激光陶瓷还展现出非常接近于单晶的透明性和热机械特性。激光陶瓷对激光器性能起关键作用，特别是在光传输损耗、导热率、掺杂物质的吸收和发射特性以及光学各向异性等，这些特性匀类似于单晶激光基质的特性。     

Vertical-external-cavity surface-emitting lasers and quantum dot lasers

The use of cavity to manipulate photon emission of quantum dots (QDs) has been opening unprecedented opportunities for realizing quantum functional nanophotonic devices and quantum information devices....     

固体Raman激光器与OPO激光器比较

综述了近5年来固体Raman激光器和光参量振荡(OPO)激光器的发展情况,并对Raman激光器和OPO激光器在工作原理、晶体材料方面进行了比较。Raman激光器在光束质量、光路稳定方面存在优势,而OPO激光器调谐范围大,输出功率高。最后对固体Raman激光器和OPO激光器发展前景进行了简要介绍。     

Glass lasers

In the eight years since the first publication of glass laser operation, considerable progress has been made in this technology with 5 active laser ions operating at 7 emission wavelengths having been confirmed so far. Laser action has been obtained in time regimes from continuous wave to pulsed operation with pulse widths down to 2.5 × 10^-13second. In addition, glass lasers currently provide the highest energy, the highest peak power, and the highest radiance laser sources. An efficiency of energy conversion to the optical second harmonic at 530 nm exceeding 50 percent has been obtained. Recent developments show promise of equaling gas laser performance in coherence length and average power. Present energy conversion efficiencies of over 8 percent and the development of a fiber laser receiver preamplifier are making glass laser systems applications increasingly attractive. This paper reviews the evolution of glass lasers, describes some recent developments, and discusses a number of applications in this fast-growing field.     

Applied lasers

The laser has been found useful for short-distance communication or for communication across the macrodimensions of space. Two short-distance voice-communication systems are described?one requiring careful boresight alignment and the other involving a megaphone-like broad-beam laser that needs little alignment. A laser range-measuring system has been developed that can make distance checks for aircraft refueling or for measuring the altitude of spacecraft landing on the moon. The principles of ranging can also be applied to selective viewing, maintaining a separation of vehicles moving along a set path, or selectively counting certain-sized objects. The laser also can be used in a simple intrusion alarm since its narrow beam can be reflected over a very long distance with little spreading.     

Tunable lasers

Tunable lasers are a key component for building flexible and streamlined optical networks capable of increasing functionality with lower overall network cost. It is in the nature of technological evolution that many avenues are initially explored with elaborate schemes. Despite the allure of ingenuity, however, the winning solutions are usually the simple ones that leverage an existing technology and market base. The outlined approach of full-band tunable lasers based on DFB technology meet the existing performance specifications and possess a cost structure that will ultimately displace static-wavelength DFBs, making tunability ubiquitous.     

Tunable lasers

Discusses how, aimed at wavelength-division multiplexing, tunable lasers can save money while making networks more flexible     

Glass lasers

After a general discussion of the merits of glass vs. crystals as host materials for laser ions, a summary is given of the various glass lasers. Because of its importance as an efficient, room temperature laser the properties of neodymium are considered in greater detail. This includes the nonlaser properties of Nd³⁺in glass, the spectral and temporal emission characteristics of Nd³⁺lasers, and Nd³⁺laser configurations. Separate sections deal with the other two room temperature lasers which use Yb³⁺or Er³⁺. The problem of thermal of laser cavities is also discussed. Finally, a survey is given of the glasses that are useful as Faraday rotators.     

Heterostructure lasers

The demonstration of CW room temperature operation of the heterostructure laser was the beginning of a new era in semiconductor devices. This era introduced the use of heterojunctions to create electrical as well as optical boundaries. New developments in epitaxial techniques provided the base for heterojunction devices. This work describes the interdisciplinary research effort that lead to the breakthrough which enabled the room temperature operation of semiconductor lasers.     

Semiconductor lasers

This paper is a review of semiconductor laser work. The principles of operation are discussed. The stress is on work since early 1964. The present state-of-the-art in GaAs junction lasers is described.     

Gasdynamic lasers

It is not enough to depend upon diffusivity to dissipate the heat from a gas laser. Under the circumstances, average power outputs are too limited. By generating flow within the gas and deriving the benefits of forced convection, performance is improved. But if flow can be used to improve power outputs, it also can be used to advance a step further and generate the conditions that are necessary for lasing action?thereby creating a gasdynamic laser. This article covers the theory behind such a device and describes an experimental unit that has proved the merit of the concept.     

Short-wavelength lasers

The development of short-wavelength lasers is reviewed. Three pumping mechanisms have been demonstrated which produce lasing at wavelengths from 3 to 100 nm. These mechanisms include electron-collisional excitation, electron-ion recombination, and photo-excitation. Examples of X-ray lasers and future directions of the field are discussed     

微腔半导体激光器泵浦的光孤子源研究

从微腔半导体激光器考虑相位变化的速率方程和光纤非线性薛定谔方程出发，数值模拟了交变电流注入下微腔半导体激光器内腔和光纤外腔中的光振荡过程，研究了光孤子形成的可能性。结果表明，合理选择自发发射因子、有源区体积、相位振幅耦合参数、附加相位参量等内外腔参数，可以实现稳定的孤子脉冲输出。     

Triggerable semiconductor lasers

A triggerable semiconductor laser emits light in very short (0.1 ns) intense (0.1 W) pulses with a few nanosecond periods when biased a fraction of a milliampere above a threshold current. Single uniform lightwave pulses can be triggered by fractional milliampere current pulses up to several nanoseconds in duration. This behavior was first seen in computer simulations of devices with a high electron-trap density (other causes are possible). Devices exhibiting this behavior have been found among the population of AlGaAs stripe lasers made by deep proton bombardment. A simple lightwave pulse regenerator has been built by adding a photodiode with less than unity gain. This circuit emits lightwave pulses with 6 pJ energy, less than 0.2 ns in duration, and with an amplitude that is up to 15 times larger than the input pulse.     

波长(频率)可调谐半导体激光器

波长或频率可调谐的半导体激光器在光通信等实际应用领域中有着重要而广泛的应用。文章立足于实际应用,从谐振腔的结构出发,以调谐机理为研究对象,对可调谐半导体激光器进行了分类研究,并对它们的调谐特性做了总结