二极管象散光束端面泵浦Nd:YAG激光器

研究了用象散二极管激光光束端面泵浦的TEM0m,TEMn0多模Nd:YAG激光器。文中报导了不同泵浦功率下的激光模式情况和稳定性情况,最大CW输出功率320mW,斜效率28%,最高稳定CW输出功率232mW,斜效率20%,为进一步研究二极管泵浦的列阵器件奠定了基础。     

基于角度调谐F-P干涉仪的C波段可调谐激光器的研究

研究了基于法布里一珀罗(F-P)干涉原理的角度调谐的滤波器特性,使用自制的滤波器进行可调谐掺Er^3 光纤激光器实验。当980nm泵浦功率为30mW时获得了稳定的单纵模激光输出,输出功率约。0.65mW,线宽低于0.1m,在35．76nm波长调谐范围内功率变化不超过1dB,边模抑制比(SMSR)大于35dB;泵浦功率为46mW时获得了最大的输出功率,约为1mW。     

High-temperature(T = 80℃) operation of a 2μm InGaSb-AlGaAsSb quantum well laser

正An InGaSb/AIGaAsSb compressively strained quantum well laser emitting at 2μm has been fabricated. An output power of 82.2 mW was obtained in continuous wave(CW) mode at room temperature.The laser can operate at high temperature(T = 80℃),with a maximum output power of 63.7 mW in CW mode.     

平均功率近2 W的被动锁模皮秒掺镱光纤激光器

报道了一个三级主振荡功率放大(MOPA)结构的瓦级皮秒光纤激光器.第一级利用半导体可饱和吸收镜(SESAM)和光纤光栅组成线性腔,构建了一个低功率的被动锁模掺Yb3+光纤激光器,其最大平均输出功率为9.2 mW,作为整个激光器的种子源;第二级采用单模掺镱光纤放大器对种子光进行预放大,得到108 mW平均输出功率;第三级采用带树状耦合器的双包层掺镱光纤放大器进行功率放大,获得了1.9 W平均输出功率.得到的脉冲脉宽36 ps,中心波长1064 nm,重复频率29.6 MHz,峰值功率1.8 kW,相应的单脉冲能量为61 nJ.实验中观察到种子源输出光谱中有一个凹陷,这是由于光纤光栅反射率过高并且带宽较窄引起的.     

High-power optically pumped 1550-nm VECSEL with a bonded silicon heat spreader

We present an optically pumped 1550-nm vertical-external-cavity surface-emitting laser with improved output power and operating temperature using a bonded heat spreader. The laser comprises an InGaAsP-based gain element, with a resonant periodic gain structure on top of a distributed Bragg reflector, and a high reflectivity spherical mirror as the external reflector. Heat transport is enhanced by a Si heat spreader bonded to the InGaAsP surface by liquid capillary bonding. Optical pumping is achieved using a 1250-nm fiber Raman laser. A maximum continuous output power of 250 mW was obtained under multitransverse mode operation at 240 K. Under operation in the fundamental near-Gaussian mode, we obtained a maximum power of 230 mW with a beam quality factor (M/sup 2/) of 1.22. At room temperature, the output power was limited to 12 mW.     

A 0.2 W CW laser with buried twin-ridge substrate structure

An extremely high output power has been obtained with a new structure laser named the buried twin-ridge substrate (BTRS) laser. The very thin active layer formed on a ridged substrate permitted high power output increasing the catastrophic damage level. The buried stripe formed with a blocking layer remarkably improved the current confinement lowering the threshold current. A multilayer coating technique was applied to both facets to increase the front facet output. Fundamental transverse mode is achieved at more than 100 mW in CW with an uncoated laser while the maximum output power attained is as high as 200 mW in CW operation with a multicoated laser.     

LD抽运的掺Yb~(3 )双包层光纤激光器

首次尝试利用981.5nm国产LD抽运掺Yb3 双包层石英光纤,在多个波长获得激光输出。其中在1037nm获得3.84mW的激光输出,出光阈值为3.58mW,激光斜效率为55%,激光空间模式为基横模。     

自锁模掺镱光纤激光器研究

用反射率为 1 5dB掺镱光纤光栅作为反射器的掺镱光纤激光器 ,产生了稳定的纳秒级脉冲序列 ,脉冲宽度小于 5ns。激光器的阈值功率为 1 8mW ,在锁模工作区域内最大输出平均功率为 3mW ,脉冲重复频率为 2 5MHz,能量转换效率为 5 %。研究了产生自锁模的原因和特性     

波长扫描锁模掺Er光纤激光器的实验研究

阐述了波长扫描锁模掺Er光纤激光器的工作机制,并进行了实验研究.用波长980nm的激光二极管作为泵浦源,在可调谐滤波器100 Hz的扫描频率下,得到了重复频率25 MHz,波长扫描范围1 527～1 534 nm的稳定脉冲序列.激光器以锁模运转的阈值泵浦功率为8.7 mW.当入纤泵浦功率为57.6 mW时,得到了平均功率为0.68 mW的脉冲输出.     

二极管泵浦的微型绿光激光器

本文介绍一种二极管泵浦的Nd:YAG+KTP微型绿光激光器,单纵模532μm的绿色激光输出5.6mW,无“绿色噪声”,器件体积为36mm×32mm×26mm.     

基于光纤光栅法布里-珀罗腔的高效窄线宽光纤激光器

报道了采用双光纤光栅(FBG)法布里-珀罗(F-P)腔选模的线形腔结构窄线宽光纤激光器。激光器以高掺杂Er~(3 )光纤为增益介质,利用全光纤型法拉第旋转器(FR)抑制空间烧孔效应,通过两个短光纤光栅法布里-珀罗腔选模,产生了稳定的1534．83 nm单频激光输出。激光器采用两支976 nm单模激光二极管(LD)抽运,两端输出。激光器阈值抽运光功率为12 mW,在总抽运光功率为145 mW时总输出信号光功率为39．5 mW,单端最高输出信号光功率为22 mW。光-光转换效率为27％,斜率效率为29．7％。随着抽运功率的增加,激光器输出功率趋于饱和。采用延迟自外差方法精确测量光纤激光器线宽,实验中使用了15 km单模光纤延迟线,由于测量精度的限制,得到激光器的线宽小于7kHz。这种光纤激光器具有输出功率高、线宽窄、信噪比高的特点,可用于高精度的光纤传感系统。     

CW operation of an intracavity pumped molecular submillimeter-wave laser

The 373-μm line of CH3CN was operated in a CW mode in an arrangement where the submillimeter (SMM)-wave laser is placed inside the resonator of the CO2pump laser. 1 mW of CW output power was obtained; this is five times the power of a comparable SMM-wave laser in the common extracavity arrangement. In a pulsed mode, a peak power of 46 mW was measured.     

675 mW diffraction limited operation and thermal characteristics of laser diode arrays in an external cavity

A compact external cavity configuration consisting of a high power gain guided laser array, a graded index lens and a mode selective mirror was investigated. The laser array was stabilised in a single spatial mode to an output power of 950 mW with 675 mW in a diffraction limited lobe under pulsed operation. The spatial mode properties of the external cavity are also correlated to thermal lasing effects in good agreement with theory.<>     

High-power single longitudinal mode operation of twin-channel substrate mesa guide (TCSM) lasers

Improved TCSM lasers with antireflection coatings have been developed that operate in a stable zero-order mode to output powers of 80 mW CW. The devices operated in a stable single longitudinal mode to powers >65 mW. This is believed to be the highest single-mode power ever reported from an individual diode laser.     

激光二极管抽运Nd∶GdVO_4微片激光器

报道了一种新型激光二极管(LD)端面抽运Nd∶GdVO4微片激光器,测量了抽运输入功率与激光输出功率的关系,激光阈值功率为83 mW,在2 W的抽运功率下得到860 mW的1.064μm基横模连续激光输出,光-光转换效率为43%,最大斜度效率达到47%。     

High-power single-mode 2.0 μm laser diodes

Data are presented on high-power single-mode index-guided laser diodes fabricated from a strained-layer InGaAs-InGaAsP double quantum well heterostructure epitaxial design. The total maximum power and external efficiency achieved are 50 mW and 43%, respectively. The far-field is measured to be 31° by 46° in the parallel and perpendicular directions, yielding an aspect ratio of 1.5 for the single-mode laser diode. The optical output of the laser diode is a multi-longitudinal mode spectrum spanning 1.98-2.00 μm at an output power of 50 mW CW. The characteristic temperature of the laser diode is 48 K     

两个激光二极管端面泵浦的基横模Nd：YAG激光器

用两个功率为１．５Ｗ的连续激光二极管偏振耦合端面泵浦及分别从双端同时泵浦Ｎｄ：ＹＡＧ激光器，ＴＥＭ００模ＹＡＧ激光最大输出功率分别为６８０ｍＷ和４９２ｍＷ，总的光－光转换效率分别为２６．４％和１７．７％。从理论上对二极管单端面及双端面泵浦的ＹＡＧ激光器进行了分析计算。     

A 780 nm high-power and highly reliable laser diode with a longcavity and a thin tapered-thickness active layer

Conventional AlGaAs laser diodes with uniform thickness active layers of various cavity lengths are investigated. It is recognized that the extension of the cavity length is effective in the improvement of the maximum output power, the temperature characteristics, and the operating life in high-temperature conditions. A 780-nm, high-power laser diode having a 350-μm-long cavity with a thin tapered-thickness active layer was fabricated. The optical power density near the mirror facets, the thermal resistance, the current density, and the carrier density were reduced by this structure. The laser emitted over 100 mW of CW (continuous-wave) output power at temperatures up to 80°C. A maximum output power level of 160 mW was achieved at room temperature. The fundamental transverse mode was confirmed at least up to 120 mW     

Improved coupling efficiency of a strained InGaAs-AlGaAs quantum-well laser into a fiber Bragg grating

We describe a highly efficient coupling of up to 78% into a single mode fiber (SMF) by utilizing a low-divergence-angle InGaAs-AlGaAs laser and a new high-NA aspheric lens, resulting in the coupled optical output of over 300 mW with a kink-free performance. The kink-free 300 mW of fiber-coupled power is the largest power reported from a diode laser wavelength stabilized using a fiber Bragg grating. A 3% fiber Bragg grating makes the optical output stabilize at a wavelength of 1.016 /spl mu/m for an optical output power up to 310 mW and without any distinct decrease of the optical output. The coupling tolerance for lateral offsets is improved by utilizing a thermal-diffused expanded-core technique even in the case of using a high-NA coupling aspheric lens. We have also achieved a 300-mW fiber-coupled wavelength-stabilized InGaAs-AlGaAs semiconductor laser butterfly module using a fiber Bragg grating.     

窄线宽LD泵浦双包层光纤激光器

报道了LD泵浦的窄线宽双包层光纤（DCF）激光器，从理论和实验数值模拟了激光输出功率对输出镜反射率，光纤长度和吸收泵浦功率的依赖关系，进而进行了实验，实验中选用光纤布拉格光栅（FBG）作为输入腔镜，利用光纤端面菲涅耳反射作为输出腔镜，得到了窄线宽的单模激光输出。最大输出功率421mW，斜率效率78.2%，激光中心波长1086.92nm，谱线宽度0.16nm。