Diode lasers from Toptica Photonics have linewidth

GreenMode and RedMode diode lasers offer output of 515 nm at 25 mW, 638 nm at 30 mW, and 685 nm at 25 mW. They use coherence-advanced regulation mode stabilization for continuous mode-hop-free operation. They have linewidth <5 MHz, coherence length >25 m, and long-term wavelength stability <0.5 pm/h.Toptica Photonics
Munich, Germanywww.toptica.comMore Products ----- PRESS RELEASE TOPTICA introduces new wavelengths with CHARM, an active coherence stabilization scheme TOPTICA Photonics has expanded its successful BlueMode diode laser family product portfolio. The new GreenMode and RedMode models convey the original concept – high power and high coherence from a single diode – across the visible spectrum. What’s more, all models are now available in TOPTICA’s proprietary CHARM (CoHerence-Advanced Regulation Mode) technology, a “world’s first” technique for active coherence control. TOPTICA´s BlueMode has rapidly gained acceptance in demanding laser-based inspection and metrology tasks. Researchers and engineers benefit from the combination of high power (up to 50 mW at 405 nm) and single-frequency laser operation, which is unmatched by any other direct diode-based source. The established BlueMode wavelengths (405, 445 and 488 nm) are now complemented by the new GreenMode (515 nm, 25 mW) and RedMode (638 nm, 30 mW and 685 nm, 25 mW) models. Blue/green wavelengths are well-suited for Raman spectroscopy and quantum cryptography; red wavelengths are a common choice in interferometry. Applications requiring multiple laser lines will benefit with this option of running two lasers simultaneously with the same set of driver electronics. Even though the first-generation BlueMode lasers already outperformed the competition in terms of mode stability, a change in ambient conditions (temperature, air pressure or humidity levels) could still lead to occasional mode instabilities and incoherent, “multi-mode” emission intervals. TOPTICA devised a new CHARM stabilization scheme to handle these challenges. CHARM employs an FPGA-based regulator to ensure continuous single-frequency operation, thus providing excellent long-term laser wavelength and output power stability. Mode-hops and resulting “step changes” of the laser’s power or frequency have thus become a hassle of the past. CHARM stabilization is available for all BlueMode / GreenMode / RedMode wavelengths with a computer-controlled laser system that uses a few simple software commands. All of these lasers in this family feature an integrated isolator for optical feedback protection and can be equipped with TOPTICA´s proprietary Fiberdock for highly-efficient fiber coupling (typically > 60% into a single-mode fiber).

Come to our booth to see TOPTICA’s live laser demonstration with CHARM stabilization at BiOS / Photonics West, San Francisco, at booth (8)817.

Key Features
-Up to 50 mW output power
-Linewidth < 5 MHz, coherence length > 25 m
-Continuous mode-hop-free operation with CHARM stabilization
-Available wavelengths: 405 nm, 445 nm, 488 nm, 515 nm, 638 nm, 685 nm
-Excellent long-term wavelength stability (< 0.5 pm/h)
-Optional single-mode fiber coupling with highest efficiency (typical 60%)

Applications
-Interferometry and holography
-Precision metrology
-Raman spectroscopy
-Quantum cryptography
-Photonic down-conversion

Wavelength stability (upper three traces) and fringe visibility contrast (bottom trace) of three BlueMode / RedMode lasers, with CHARM coherence stabilization. All of the lasers remain highly coherent, without any mode-hops or multi-mode emission intervals.

TOPTICA Photonics AG develops, manufactures, services and distributes technology-leading diode and fiber lasers and laser systems for scientific and industrial applications. Sales and service are offered worldwide through TOPTICA Germany and its subsidiary TOPTICA USA, as well as all through 14 distributors. A key point of the company philosophy is the close cooperation between development and research to meet our customers’ demanding requirements for sophisticated customized system solutions and their subsequent commercialization.

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