Generation of a Purely Single Transverse Mode Vortex Beam from a He-Ne Laser Cavity with a Spot-Defect Mirror

Kano, Ken; Kozawa, Yuichi; Sato, Shunichi

doi:10.1155/2012/359141

Cited by 49 publications

(25 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A resonator supporting higher order modes usually produces a mixture of multiple modes, including the fundamental mode. In order to avoid the resonance of the fundamental Gaussian mode, a typical approach is to place an intracavity element (e.g., an SPP or a mirror) to force the oscillator to resonate on a specific OAM mode [38].…”

Section: 1b Intra-cavity Approachesmentioning

confidence: 99%

Optical communications using orbital angular momentum beams

et al. 2015

View full text Add to dashboard Cite

Orbital angular momentum (OAM), which describes the "phase twist" (helical phase pattern) of light beams, has recently gained interest due to its potential applications in many diverse areas. Particularly promising is the use of OAM for optical communications since: (i) coaxially propagating OAM beams with different azimuthal OAM states are mutually orthogonal, (ii) inter-beam crosstalk can be minimized, and (iii) the beams can be efficiently multiplexed and demultiplexed. As a result, multiple OAM states could be used as different carriers for multiplexing and transmitting multiple data streams, thereby potentially increasing the system capacity. In this paper, we review recent progress in OAM beam generation/detection, multiplexing/demultiplexing, and its potential applications in different scenarios including free-space optical communications, fiber-optic communications, and RF communications. Technical challenges and perspectives of OAM beams are also discussed.

show abstract

Section: 1b Intra-cavity Approachesmentioning

confidence: 99%

Optical communications using orbital angular momentum beams

et al. 2015

View full text Add to dashboard Cite

show abstract

“…These Lagurre-Gaussian modes are vortex modes with topological charge (ℓ) [15,16]. Suppression of the lowest order Gaussian mode can been achieved in a number of ways, including pumping the laser gain medium with an annular pump spot [17,18], using intra-cavity defects [19][20][21][22][23] and thermal lensing [24,25].…”

Section: Direct Generation Methodsmentioning

confidence: 99%

“…The use of an intra-cavity defect to suppress the lowest order oscillating mode (generally TEM 00 ) within a laser cavity has been achieved using a number of different laser systems, including He-Ne lasers [20] and solid-state lasers [19,[20][21][22][23]. The common feature of each of these systems is that an intra-cavity defect is used; such as engineered damage spots on resonator mirrors.…”

Section: Intra-cavity Defect Spotmentioning

confidence: 99%

Direct Generation of Vortex Laser Beams and Their Non-Linear Wavelength Conversion

Lee¹,

Omatsu²

2017

Vortex Dynamics and Optical Vortices

View full text Add to dashboard Cite

Vortex laser beams are a technology that has revolutionised applications in micro-and nano-manipulation, micro-fabrication and super-resolution microscopy, and is now heralding advances in quantum communication. In order to service these, and emergent applications, the ability to generate powerful vortex laser beams with user-controlled spatial and wavefront properties, and importantly wavelength, is required. In this chapter, we discuss methods of generating vortex laser beams using both external beam conversion methods, and directly from a laser resonator. We then examine the wavelength conversion of vortex laser beams through non-linear processes of stimulated Raman scattering (SRS), sum-frequency generation (SFG), second harmonic generation (SHG) and optical parametric oscillation. We reveal that under different types of non-linear wavelength conversion, the spatial and wavefront properties of the vortex modes change, and in some cases, the spatial profile also evolve under propagation. We present a theoretical model which explains these dynamics, through decomposition of the vortex mode into constituent Hermite-Gaussian modes of the laser resonator.

show abstract

“…By altering the potentiometer P 1 and applying an adequate voltage to the inverting input of the operational amplifier (OA 1 ), the current of the laser tube can be adjusted at an optimal value. Hereafter, any unwanted change in the laser current will be neutralized through the negative feedback loop, including the optocouplers OP 1 and OP 2 , the resistor R 7 and the operational amplifier OA 1 . The Darlington transistors DT 1 -DT 4 , biased through the resistors R 1 -R 4 , provide a voltage ladder as a high-voltage transistor.…”

Section: Laser Stabilization Systemmentioning

confidence: 99%

“…The coherence time of the laser is very important for many laser applications such as interferometry, speed measurements, laser gyroscopes, and so on. Among these applications, recently the generation of vector doughnut beams and purely single transverse mode vortex beams [1,2] are also under consideration, for which the periodical change of the intensity and polarization distributions of the He-Ne lasers can significantly affect the final outcomes. Therefore, the thermally stabilized He-Ne lasers play a very important role to improve the experiments' results.…”

Section: Introductionmentioning

confidence: 99%

Frequency stabilization of ambience-isolated internal-mirror He–Ne lasers by thermoelectric-cooling thermal compensation

Shirvani-Mahdavi

Narges

2016

J Theor Appl Phys

View full text Add to dashboard Cite

An approach for frequency stabilization of an ambience-isolated internal-mirror He-Ne laser (632.8 nm) utilizing temperature control of the laser tube with Peltier thermoelectric coolers is demonstrated. Measurements indicate that there are an optimal temperature (23°C) and an optimal discharge current (5.5 mA) of laser tube for which the laser light power is separately maximized. To prevent the effect of fluctuation of discharge current on the laser stability, an adjustable current source is designed and fabricated so that the current is set to be optimal (5.50 ± 0.01 mA). To isolate the laser tube from the environment, the laser metallic box connected to two Peltier thermoelectric coolers is surrounded by two thermal and acoustic insulator shells. The laser has two longitudinal modes very often. Any change in the frequency of longitudinal modes at the optimal temperature is monitored by sampling the difference of longitudinal modes' intensities. Therefore, using a feedback mechanism, the current of thermoelectric coolers is so controlled that the frequency of modes stays constant on the gain profile of the laser. The frequency stability is measured equal to 1.17 9 10 -9 (*27009) for less than 1 min and 2.57 9 10 -9 (*12009) for more than 1 h.

show abstract

Generation of a Purely Single Transverse Mode Vortex Beam from a He-Ne Laser Cavity with a Spot-Defect Mirror

Cited by 49 publications

References 16 publications

Optical communications using orbital angular momentum beams

Optical communications using orbital angular momentum beams

Direct Generation of Vortex Laser Beams and Their Non-Linear Wavelength Conversion

Frequency stabilization of ambience-isolated internal-mirror He–Ne lasers by thermoelectric-cooling thermal compensation

Contact Info

Product

Resources

About