Miniature selfaligned external cavity tunable single. Chung1 1department of electrical engineering, korea advanced institute of science and technology, 291 daehakro yuseonggu, daejeon 305701, south korea. Tunable external cavity diode laser at 650 nm based on a transmission diffraction grating toni laurila, timo joutsenoja, rolf hernberg, and markku kuittinen a tunable external cavity diode laser. A new design for a tunable external cavity diode laser j. Littman metcalf tunable external cavity diode laser, 630nm 2450nm, up to 100mw, patented technology, handsoff operation, large modehop free piezo tuning range, narrow linewidth, free space and fiber coupled versions. Pdf tunable externalcavity diode laser at 650 nm based on. Laser cavity selfaligned external laser cavity modehopfree characteristic mode hops plague most tunable laser designs and are quite bothersome in many user applications. Tunable external cavity diode laser based on integrated waveguide structures.
The phase and amplitude balances inside the lasing cavity would be changed. Their most conspicuous manifestation is the sudden, unpredictable, and nonreproducible wavelength shifts, which make the sweep discontinuous. Zorabedian characteristics of grating external cavity semiconductor laser containing intracavity beam expanders, j. While all laser gain media allow small shifts in output wavelength, only a few types of lasers allow continuous tuning over a significant wavelength range there are many types and categories of tunable lasers. Pdf external cavity wavelength tunable semiconductor lasers. The wavelength separation is realized by a low loss interference filter instead of the common diffraction grating. Pdf external cavity wavelength tunable semiconductor lasers a.
Chuang et al tunable external cavity diode laser j. Tunable external cavity diode lasers world scientific. The configuration of our electronically tunable externalcavity laser diode etecal is shown in fig. Tunable diode lasers in littmanmetcalf cavity design. Tunable highpower narrowspectrum externalcavity diode. An external cavity tunable diode laser employs an external reflector to reflect a portion of output light back into the lasing cavity. The velocity tlb6700 is our premier tunable diode laser system offering both wide and fine wavelength scanning. Laser cavity selfaligned external laser cavity modehopfree characteristic mode hops plague most tunable laser designs and are a major probleme in many applications. Principles of modehop free wavelength tuning sacher laser. The configuration of our electronically tunable external cavity laser diode etecal is shown in fig. Like the dl pro, it is an extended cavity diode laser ecdl. Design and performance of a frequency chirped external cavity diode laser, kevin s. Design and development of an external cavity diode laser for laser. External cavity diode laser new focus tunable external cavity diodes lasers lead the market with high performance, delivering true continuous modehopfree tuning over wide wavelength ranges.
The littmanmetcalf cavity configuration provides exceptional stability. Precision finely tunable external cavity diode laser. We propose the ecl as a lowcost, highperformance alternative to fibre and diode lasers in this wavelength range and demonstrate its capability. The saf laser diode is comprised of a curved ridge waveguide that intersects the facet cleavage plane normally at one facet and at an angle at the other facet. Development of a widely tunable amplified diode laser. A tunable laser is a laser whose wavelength of operation can be altered in a controlled manner. Turner for their assistance with the design and construction of. Pdf external cavity wavelength tunable semiconductor. We have designed and built a robust tunable external cavity diode laser that is easily constructed from commercial components. We present a new concept for an electronically tunable diode laser.
Externalcavity diode lasers ecdl have widespread applications in optical. Oct 01, 2011 we report on the spectral properties of a diode laser with a tunable external cavity mirror, realized as an integrated optics waveguide circuit. Both laser diode and dmd are located in the focal plane of the lenses, making the angular tolerances of the optical components quite forgiving for the entire cavity. The stationary and dynamical characteristics are investigated as well as the chaotic behavior of the modulated external cavity laser diode. Check our arcoated diode stock list for availability. For the present design a rooftop prism was used as external cavity reflector. Pdf littrow configuration tunable external cavity diode. Littrow configurations there are advantages and disadvantages to both the. Selfaligned nondispersive external cavity tunable laser. The external cavity consists of an antireflectioncoated ar commercial 670nm laser diode ld, a collimator, a diffraction grating. A record broadly tunable highpower external cavity inasgaas quantumdot diode laser with a tuning range of 202 nm 1122 nm24 nm is demonstrated. Due to this new design, the laser is characterized by a. Operation principles of tunable externalcavity diode lasers in this chapter first we introduce the basic principles of the gratingtuned external cavity diode lasers ecdl in sec.
Linewidths below 100 khz with external cavity diode lasers. Various laser types were investigated in sxc configurations using both planar and spherical external mirrors. Duarte road, monrovia, ca 91016, usa abstract we have developed a selfaligned external cavity laser with a nondispersive volume holographic grating vhg as the output coupler. Tunable singlefrequency operation of a diode pumped vertical external cavity laser at the cesium d2 line 317 fig. Tunable external cavity diode laser using a micromachined. Schematic layout and photograph of discrete tunable external cavity laser. Continuously tunable single frequency external cavity. Singleangledfacet laser diode for tunable external cavity. Pdf tunable externalcavity diode laser at 650 nm based. An external cavity laser system composed of a semiconductor diode laser 10, a temperature control 30 and injection current control 40 means the diode laser, an external cavity 60 with a wavelength selector and means for controlling the laser temperature 20, laser injection current and the wavelength selector 110 to obtain arbitrary frequencies within the tuning range of the laser. The dl pro hp diode laser features a special resonator design, which allows for higher singlemode output powers from visible laser diodes. The ricci hansch type of external cavity diode laser in littrow design is a tunable fixed wavelength t.
There are many practical uses, from communications to spectroscopy. Littmanmetcalf tunable diode lasers scientific lasers. Precision finely tunable external cavity diode laser the new focus tunable external cavity diode lasers deliver true continuous modehopfree tuning. Tunable highpower externalcavity gan diode laser systems in. The design and demonstration of a dial laser transmitter based on a tunable external cavity diode laser 3638 ecdl is presented in this paper as a possible alternate seed laser source. A sxc forces a multimode diode laser to lase on a single longitudinal mode. The external cavity length and the diode mode have been chosen so that the overall gain peak occurs at. It is based on an external cavity configuration with simultaneous feedback and intracavity spatial separation of the lasers.
The author explains how tunable external cavity diode lasers work, and why they are important. 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. We mainly focus on the laser diode coupled to a short external cavity by developing model equations appropriate to analyze this configuration. While all laser gain media allow small shifts in output wavelength, only a few types of lasers allow continuous tuning over a significant wavelength range. The external cavity consists of an antiref lectioncoated ar commercial 670nm laser diode ld, a collimator, a diffraction grating 2000 grooves. Pdf external cavity tunable lasers have been around for many years and now constitute a large group of semiconductor lasers featuring very unique. Littrow modular tunable external cavity laser, 370nm 1770nm, up to 300mw, patented technology, modular cavity design, easy laser diode exchange, narrow linewidth, up to 30ghz modehop free tuning, free space and fiber coupled versions. This results in the best performance for an external cavity diode laser system in littrow. A maximum output power of 480 mw and a sidemode suppression ratio greater than 45 db are achieved in the central part of the tuning range. Aside from tunability, these applications often require narrow linewidth single mode operation. In this chapter, both blue and green highpower tunable diode laser systems based on gan broadarea diode laser bal in littrow external cavity are. External cavity diode laser ecdl is a tunable diode laser and this laser can be tuned to an atomic transition. Although the wavelength of diode laser can be tuned by changing.
The laser source development group at montana state university msu has extensive experience building highquality ecdls, which was leveraged to develop the. A novel tunable diode laser using volume holographic gratings. Gratingassisting codirectional coupler gaccdbr gratingcoupled sampledreflector gcsr diode laser arrays. Mar 27, 2021 pdf external cavity tunable lasers have been around for many years and now constitute a large group of semiconductor lasers featuring very unique.
Vertical cavity surfaceemitting lasers vcsel other widely tunable monolithic diode lasers. Tunable monolithic semiconductor diode lasers tunable. Integrated micromachined tunable lasers for alloptical. The output power is coupled out via the rear facet of the laser chip for avoiding any beam walk. The 782 nm laser diode is tuned to 780 nm and tested by fluorescing a rubidium vapor sample. Since its introduction, topticas dl pro leads the field of tunable diode lasers, thanks to its narrow linewidth, large modehopfree tuning range and highest vibration and. Tunable singlefrequency operation of a diodepumped. Pdf mode stability of external cavity diode lasers researchgate. Recently, progress has been made in the direction of miniaturizing tunable laser diode systems, as devices have been reported in a miniaturized vhg setup from. In the last years, external cavity diode lasers ecdls have experienced a tremendous improvement. Extendedcavity diode lasers ecdls are laser sources used in many applica. Tunable external cavity diode lasers ecdl are employed in many applications, including coherent optical telecommunications, atomic and molecular laser. Tunable external cavity diode lasers tunable semiconductor.
Characteristics and applications of the short external cavity. External cavity diode lasers offer more stable output frequency and narrow spectral bandwidth. The maximum output power of both laser systems is more than 1. Their most conspicuous manifestation is in the powervswavelength characteristic at a constant diode current, which exhibits significant stairlike glitches. Design and characterization of a littrow configuration external.
Both lasers feature various modulation inputs and may be equipped with various options like fiber coupling, beam shaping etc. Pdf, lowcost external cavity diode laser for cold atom. Widely tunable, narrow linewidth externalcavity gain chip laser for. We deploy a novel technique for the attainment of modehopfree continuous tuning over several tens. The linewidth of external cavity diode lasers ecdls is an increasingly important characteristic for. Introduction wavelength tunable laser is in rapid development to become one of the key components in the fiberoptic networks. Tunable external cavity diode lasers ecdl are employed in many applications, including coherent optical telecommunications, atomic and molecular laser spectroscopy, laser cooling, atomic clocks, environmental sensing, and optical microcavities. The capability of network can be greatly improved by use of tunable laser while the cost drops down. Tunable external cavity diode lasers in littrow and littmanmetcalf configuration littmanmetcalf vs. It is called a pseudo external cavity laser because it oscillates without the external cavity. This thesis describes the use of short external cavity sxc semiconductor diode lasers as single longitudinal mode sm tunable sources. Characterization and development of an extended cavity.
The external cavity is realized with class d antireflection coated diode lasers and with a high efficiency diffraction grating. An external cavity laser system composed of a semiconductor diode laser 10, a temperature control 30 and injection current control 40 means the diode laser, an external cavity 60 with a wavelength selector and means for controlling the laser temperature 20, laser injection current and the wavelength selector 110 to obtain arbitrary frequencies within the tuning range of. Characterization and development of an extended cavity tunable laser diode a thesis presented to the faculty of the department of physics and astronomy. Ecl is tunable and operates with single mode and broad area multimode laser diodes. Turner for their assistance with the design and construction of associated electronics and vibration isolation. The laser is tuned, by changing both the temperature and varying the external cavity length, to a wavelength of 780 nm.
Prior research on the combination of the grating and the fp etalon has been carried out for the tunable external cavity laser diode 14 15 1617. A new design for a tunable external cavity diode laser. We experimentally demonstrate tunable single frequency operation at. The vortex plus tlb6800 is our highest performance precision finely tunable external cavity diode laser. Characteristics and applications of the short external. A pseudo external cavity laser tunable to rubidium fluorescence ryan prenger 5500 final submission purdue university physics department abstract using feedback from a pseudo external cavity and temperature control, a tunable laser diode system is built. Narrow linewidth tunable external cavity diode laser using. This is the first book on tunable external cavity semiconductor diode lasers, providing an uptodate survey on the physics, technology, and performance of. Tunable external cavity diode laser littrow configuration. A tunable 980 nm external cavity laser based upon a singleangledfacet saf semiconductor laser diode is demonstrated that does not require antireflection coatings or additional external mirrors. Cavity diode laser the new focus tunable external cavity diode lasers deliver true continuous modehopfree tuning. A novel tunable diode laser using volume holographic gratings christophe moser, lawrence ho and frank havermeyer ondax, inc.
Broadly tunable highpower inasgaas quantumdot external. An enhanced tunable littrowconfiguration external cavity diode laser ecdl is. A pseudoexternal cavity laser tunable to rubidium fluorescence. It requires only minimal, low tolerance machining, allowing for increased streamlining and ease of construction. Tunable narrowband diode laser with amplifier our new narrowdiode laser is a small footprint and lowpriced external cavity diode laser. Tunable extendedcavity diode laser based on a novel flexure. Pdf mode stability is an important performance characteristic of external cavity diode lasers ecdls. Even though the external cavity is short compared to that of other narrow bandwidth external cavity lasers, the spectral bandwidth of this tunable laser is as small as 25 khz fwhm. The antireflection coating prevets the diode fron self lasing figure 2. Pdf electronically tunable externalcavity laser diode. Continuously tunable single frequency external cavity diode. Nearir lasers are compact, rugged, and fibercoupled dfb lasers can be rapidly tuned over several wavenumbers by changing the injection current or laser temperature external cavity diode lasers can be tuned more than 100 cm1 12 4. Plus, having solid state lasers means that these are usually smaller than gas lasers giving the equivalent output. Selfaligned nondispersive external cavity tunable laser coherent.
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