LaseLock^®

Universelle und kompakte Laser-Stabilisierungselektronik

Beschreibung:

Das LaseLock ist eine universelle und kompakte Laser-Stabilisierungselektronik ("Lock-Box"), mit deren Hilfe durchstimmbare Laser (wie z.B. Diodenlaser, Ti:Saphir- oder Farbstofflaser) frequenzstabilisiert werden können. Als Referenzen dienen hierbei insbesondere optische Resonatoren (Fabry-Perot-Cavities) oder atomare Absorptions- bzw. Fluoreszenzlinien.
Umgekehrt können auch optische Resonatoren mit Hilfe von mechanischen Aktoren (z.B. Piezoaktoren) auf eine vorgegebene Laserfrequenz geregelt werden.

Hierbei finden zwei unterschiedliche Methoden Anwendung:

	Flankenstabilisierung (side-of-fringe stabilization)
	Maximum- (Minimum-) Stabilisierung ("Lock-In"-Technik, top-of-fringe stabilization)

LaseLock vereinigt alle hierfür erforderlichen oder nützlichen Komponenten in einem bequem zu bedienenden kompakten Gerät:

	Eingangsverstärker (mit Differenzverstärker und/oder Normierung)
	Sinus-Generator
	Phasensynchrone Detektion
	zwei PID-Regler und Filter für unterschiedliche Aktoren
	Scangenerator
	Ausgangsverstärker

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Preise (EU-Länder):

Anwendungsbeispiel:

1. Seeding eines OPOs zur Erzeugung von Dauerstrich-Terahertz-Strahlung

"We present an optical parametric oscillator pumped by a single mode Q-switched nanosecond Nd:YVO4 laser for terahertz generation in periodically poled lithium niobate with a new phase matching scheme. This new method leads to an emission of terahertz radiation close to the Cherenkov angle and to a parallel propagation of the pump and signal wave. The emission frequency of this novel source is chosen by the poling period to 1.5 THz. For spectral narrowing the signal wave of the OPO is injection seeded. In the optical spectrum also cascaded processes are observed demonstrating a powerful generation of terahertz waves.

The OPO itself is also seeded by a grating stabilized diode laser tunable from 1064 nm to at least 1076 nm. Therefore this seed laser is in principle useful to build OPOs for THz frequencies up to 3 THz when pumped at 1064 nm. For the purpose of cavity length stabilization we apply the Haensch-Couillaud stabilization scheme and a commercially available locking system."

aus:

D. Molter, M. Theuer, and R. Beigang:
Nanosecond terahertz optical parametric oscillator with a novel quasi phase matching scheme in lithium niobate.
Optics Express, Vol. 17, Issue 8, pp. 6623-6628 (2009) doi:10.1364/OE.17.006623

2. Abstimmbares Heterodyn-Infrarot-Spektrometer

"High-resolution spectroscopy is a versatile tool to study planetary atmospheres. [...] The paper will present a detailed description of the Cologne-based receiver THIS, the only tuneable heterodyne infrared spectrometer for application to astronomy offering access to the 7–17 mm wavelength region at a resolution of up to 3 107 and a bandwidth of 3 GHz.

To optimize the superposition of the signal and the laser and to provide a relative frequency standard a confocal FP ring resonator is used, the so-called diplexer. The diplexer consists of two focusing mirrors (focal length 30 mm) and two highly reflective beam splitters [...] The locking process is performed in two steps: first, a stabilized Helium–Neon (HeNe) laser operating at 632 nm [...] is fed into the diplexer [...] . An error signal is provided by a lock-in amplifier which can then be used to actively control the diplexer resonances via the piezo actuator.
In a second step the transmission of the QCL through the diplexer is monitored via the DC component of the heterodyne detector. A second lock-in/feedback circuit is then used to keep the QCL emission at the maximum of the diplexer transmission curve. Following this procedure the LO can be stabilized in frequency to 1MHz RMS (see Section 2.3). [...] The stabilization feedback loop consists of two LaseLock units manufactured by TEM Messtechnik."

G. Sonnabend, M. Sornig, P. Krötz, D. Stupar, R. Schieder:
Ultra high spectral resolution observations of planetary atmospheres using the Cologne tuneable heterodyne infrared spectrometer.
Journal of Quantitative Spectroscopy & Radiative Transfer 109 (2008) 1016–1029

3. Präzisionsspektroskopie

B Sanguinetti , H O Majeed , M L Jones and B T H Varcoe :
Precision measurements of quantum defects in the nP_3/2 Rydberg states of ⁸⁵Rb.
J. Phys. B: At. Mol. Opt. Phys. Vol. 42 Nr. 16 pp.165004, 2009

L A M Johnson, H O Majeed, B Sanguinetti, Th Becker and B T H Varcoe:
Absolute frequency measurements of ⁸⁵Rb nP_7/2 Rydberg states using purely optical detection.
http://arxiv.org/pdf/1002.3066

4. Durchstimmbarer cw-OPO

P. Haag: Realisierung und elektronische Stabilisierung von diodenlasergepumpten einfach-resonanten kontinuierlich-emittierenden optisch parametrischen Oszillatoren aus periodisch gepoltem Lithiumniobat.
Dissertation, Technische Universität Kaiserslautern, 2009

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