Extended temperature tuning of an external cavity diode laser. Influence of grating parameters on the linewidths of externalcavity. Fang abstract in this report, a model of external cavity semiconductor laser is built, and then. Tunable highpower narrowspectrum externalcavity diode.
External cavity laser diodes fibrecoupled laser diodes. Thon submitted to the department of physics on may 12, 2005, in partial fulfillment of the requirements for the degree of bachelor of science in physics abstract atomic ion traps are a promising candidate for scalable quantum information processing. Painter california institute of technology abstract anenhancedtunablelittrowcon. We have developed external cavity diode lasers, where the wavelength selection is assured by a low loss interference. Meng, boris nizamov, pratheepan madasamy i, jason k. Sacher, and frank schael commercially available ganbased laser diodes were antire. An external cavity has been developed for use with commercial diode lasers. External cavity diode lasers for network applications. Modehopfree tuning over 5 ghz of external cavity diode. A laser diode, ld, injection laser diode ild, or diode laser is a semiconductor device similar to a lightemitting diode in which a diode pumped directly with electrical current can create lasing conditions at the diodes junction 3 laser diodes can directly convert electrical energy into light.
Linewidths below 100 khz with external cavity diode lasers. Keywords external cavity lasers, effective reflectance, semiconductor lasers. Selfaligned nondispersive external cavity tunable laser. Commercially available ganbased laser diodes were antireflection coated in our laboratory and operated in an external cavity in a littrow configuration. A resonant cavity supports only modes that meet the resonance condition, n.
Mode stability of external cavity diode lasers cdn. It uses a diffraction grating at grazing incidence for wavelength selection and output coupling. They are used in optical communication and fibre sensor technology. The lateral structure of the emitters is a tapered ridge with a narrow angle cavity length of.
The distance between the vhg and the laser diode facet should be as small as possible. Pdf characterization of external cavity diode laser. Pdf singlefrequency external cavity green diode laser. Bab2o4 bbo crystal placed in an enhancement cavity. As such, a quantitative characterization of extended cavity diode laser phase noise in the ghz domain and evaluation of its impact on quantum optomechanical experiments is highly.
This is the first book on tunable external cavity semiconductor diode lasers, providing an uptodate survey on the physics, technology, and performance of widely applicable coherent radiation sources of tunable external cavity diode lasers. An external cavity diode laser, the vantage adopts the popular littrow design to offer higher power at a variety of wavelengths to meet your experimental needs. External cavity diode laser setup with two interference. The vhg is placed in the diverging beam of the laser diode. External cavity diode lasers offer more stable output frequency and narrow spectral bandwidth than the typical freerunning diode lasers. We demonstrate phase and frequency stabilization of a diode laser at the thermal noise limit of a passive optical cavity. Pdf electronically tunable externalcavity laser diode. Frequency locking of an external cavity diode laser. The system is compact and exploits a cavity design that reduces vibration sensitivity. The active layer consists of a strained gainas quantum well embedded in a large optical cavity. The laser cavity consists of a waveguide terminated on each end by a mirror. Modehopping suppression of external cavity diode laser by mode matching article pdf available in applied optics 534. Narrowline external cavity diode laser micro packaging in.
A narrow angular cone whose direction is normal to the grating vector provides the feedback to the laser cavity. Extremely short external cavity esec laser devices vtt. In this paper, a widely tunable external cavity diode laser ecdl with an ultrahigh side mode suppression ratio smsr was fabricated. Design of redemitting external cavity diode laser module. Next we use interferometry to make a precise measurement of the central wavelength. Pdf design and development of an external cavity diode. Driven by voltage, the doped pntransition allows for recombination of an electron with a hole. We present a design of a singlefrequency green ingan external cavity diode laser ecdl with 40mw output power and 10mhz linewidth. Pdf antireflectioncoated blue gan laser diodes in an. Its frequency noise and intensity noise was comparable or better than the nonplanar ring oscillator npro and fiber laser. Laser structure and principle of operation laser diodes consist of a n diode with an active region where electrons and holes recombine p resulting in light emission.
Design of redemitting external cavity diode laser module for highslope efficiency and narrow bandwidth jiyeon park, a,bhong joo song,a hong man na,b jun ho lee, and ilgu yuna, ayonsei university, department of electrical and electronic engineering, 50 yonseiro, seoul 120749, republic of korea bkorea electronics technology institute, display convergence research center, 25 saenariro. Alexander martin, patrick baus, gerhard birkl download pdf. Antireflectioncoated blue gan laser diodes in an external. Three configurations were constructed to investigate the.
Pdf external cavity diode laser with kilohertz linewidth. Tuning range and output power optimization of an external. External cavity diode laser setup with two interference filters arxiv. The linewidth was measured with a beterodyne technique, and 0. If the laser diode operates on a 3nm gain line, about 10 longitudinal modes, spanning 3. Surface at const t cu block laser, pdown contact and solder layers cavity length, l 1 rth. We experimentally demonstrate tunable single frequency operation at 405 nm and 785 nm. The laser system consists of a commerical diode laser, collimation.
Narrowline external cavity diode laser micro packaging in the nir and mir spectral range 5 with values over 60 db and no beam walk at the output of the laser 9. The instability of the laser frequency is measured by beating with an optical frequency comb which is phaselocked to an ultrastable oven controlled crystal oscillator. Tuning range and output power optimization of an externalcavity. It has been well established that the continuous modehopfree tuning range of a gratingfeedback. Ultrastable rubidiumstabilized externalcavity diode. Antireflectioncoated blue gan laser diodes in an external cavity and dopplerfree indium absorption spectroscopy lars hildebrandt, richard knispel, sandra stry, joachim r.
Narrowbanded ecl lasers are characterized by a very small line width, low noise, and very good wavelength stability. Str03055pm 1 design of external cavity semiconductor lasers to suppress wavelength shift and mode hopping l. Single longitudinal mode blueviolet laser diode for data. It is based on an external cavity configuration with simultaneous feedback and intracavity spatial separation of the lasers. In this bachelors thesis an external cavity diode laser has been frequency locked. Tuning range and output power optimization of an external cavity diode laser at 455 nm mingjun chi, ole bjarlin jensen,and paul michael petersen dtu fotonik, department of photonics engineering, technical university of denmark, frederiksborgvej 399, p. The second harmonic wave of the 418nm output of a gan diode laser was generated in a single. The laser diode block slides in a recess on the plate so that the beam can be centered on the grating or to match the cavity length and grating angle tuning as discussed later. External cavity diode laser setup with two interference lters alexander martin, patrick baus.
In addition, a laser diode contains an optical cavity where stimulated emission takes place. In this device, a change of phase in the light fed back into the. Scholten arc centre of excellence for coherent xray science, school of physics. Tunable highpower narrowspectrum external cavity diode laser based on tapered amplifier at 668 nm. Ft frequencystabilized external cavity diode lasers.
An increase of the output power and the beam quality of the littmanmetcalf laser is achieved by using a high e ciency grating. Pdf an ultrahighsmsr externalcavity diode laser with. Compact tuneable external cavity diode laser ecdl with. External cavity diode laser with kilohertz linewidth by a monolithic folded fabryperot cavity optical feedback. High power 7ghz bandwidth externalcavity diode laser. L long cavity lasers are preferable for high power operation, if high laser efficiency value can be preserved. Linewidths below 100 khz with external cavity diode lasers sebastian d. The ecl is tunable and operates with single mode and broad area multimode laser diodes. Modehopfree tuning over 5 ghz of external cavity diode lasers without antireflection coating sourav dutta, 1, d. Compact tuneable external cavity diode laser ecdl with diffraction limited 500 mw, and their application in bec and crds sandra stry, richard knispel, lars hildebrandt and joachim sacher. Chen 1,2, 1department of physics, purdue university, west lafayette, in 47907, usa 2school of electrical and computer engineering, purdue university, west lafayette, in 47907, usa corresponding author.
A series of experiments are performed to characterize the light emitted from an external cavity diode laser. In the context of mode locking modelocked diode lasers, external cavity diode lasers have various interesting properties. Mode stability is an important performance characteristic of external cavity diode lasers ecdls. External cavity diode lasers are used increasingly as sources of light in applications ranging from industrial photonic systems to basic laboratory research on the interaction of light and atoms. We use arrays of indexguided, tapered laser diodes emitting around 975 nm. Performance of planarwaveguide external cavity laser for. Compact, thermalnoiselimited optical cavity for diode. We present a new concept for an electronically tunable diode laser.
The tunable ecl concept is also experimentally tested with high power broad area laser diodes near 780 nm. External cavity laser diodes ecls are lasers with a very small line width, very good wavelength stability, and very low noise. Pdf mode stability of external cavity diode lasers. These characteristics are achieved by exploiting the. The ecdl was mounted in the littrow configuration, with an. The collimation tube slides into the laser diode block to allow easy variation of the external cavity. The extended cavity diode laser concept was developed by the group of prof. Also, the linewidth is reduced by a factor of more than from 40 mhz to less than 10 khz.
High power 7ghz bandwidth external cavity diode laser array and its use in optically pumping singlet delta oxygen lei s. Pdf modehopping suppression of external cavity diode. This configuration allows a gaalas diode laser to be tuned conveniently anywhere in a range greater than 20 nm. Additional optical elements, such as a saturable absorber for passive mode locking or an optical filter, can be inserted in the laser resonator the longer laser resonator allows for lower pulse repetition rates although still usually above 1 ghz, and also for. Here diode lasers provide an advantage due to their frequency agility and large piezoscan range, compared to, e.
A simple compact optical sensor system consisting of a nearfield external cavity coupled to a semiconductor laser is reported. A 1542nm planarwaveguide external cavity laser pwecl is shown to have a sufficiently low level of noise to be suitable for precision measurement applications. The output of a cw laser is defined by the overlap of the gain bandwidth and these resonant cavity modes. A total tuning range of typically 4 nm and an optical output power of up to 30 mw were observed after optimization of the external cavity. Saturation spectroscopy was used to resolve the subdoppler structure in the rubidium isotope 87rb and the laser frequency was locked against a transition between two hyper ne levels.