LCC – Modulation source for laser linewidth broadening

LCC – Laser Coherence Control

  • Modulation source for ECDLs and DFB lasers
  • Controlled linewidth broadening / coherence reduction
  • Coherence variation over more than three decades
  • Adjustable linewidths up to GHz values
  • For spectroscopy of Doppler-broadened lines

TOPTICA's laser coherence control module LCC is a stand-alone module designed to broaden the spectral profile of external-cavity or distributed feedback (DFB) diode lasers. Via a dedicated current modulation scheme, the linewidth of an ECDL or DFB laser is augmented, while its tuning properties are preserved. This allows the researcher to tailor the coherence length of a his laser to any value between 100 m and a few cm.

Technical Information

Technical Information

ConceptStand-alone modulation source with separate power supply
Maximum power0.6 W (= 28 dBm) at 50 Ω
AttenuationAdjustable via dip switch board, 0 .. -61 dB
Output bandwidth10 .. 200 MHz
Allowed voltage standing wave ratio (VSWR) at output1 .. ∞
Max. attainable linewidth

Approx. 100 MHz for ECDLs

Typ. ~ 2 GHz for DFB lasers

ConnectorSMA
ApplicationsSpectroscopy of Doppler-broadened lines, amplifier seeding (avoiding non-linear effects)

 

For use with TOPTICA’s tunable diode lasers, an AC modulation input is required on the laser head (DL-MOD PCB).

 

Mode spectrum of a DL DFB laser. Blue: 1 MHz linewidth without modulation, red: linewidth broadening to 900 MHz using the LCC.

Options & Related Products

Options & Related Products


Related Products:

Technical Drawings

Technical Drawings

Applications

Applications

 

 

 

Applications of the LCC include

  • Spectroscopy of molecular absorption lines,
  • Spectroscopy of Doppler-broadened atomic absorption lines,
  • Optical pumping of metastable Helium-3 atoms (1083 nm),
  • Seeding of high-power fiber amplifiers, avoiding nonlinear effects.


The LCC complements TOPTICA’s portfolio of modules for laser linewidth manipulation: High-bandwidth regulators like FALC 110 and DigiLock 110 have been shown to achieve sub-Hertz linewidth values, whilst the LCC broadens the spectral profile to Gigahertz levels. The range of laser coherence control thus spans more than nine orders of magnitude (coherence length 130000 km .. 4 cm).


Application Note

Download

Download

Brochure: Laboratory Electronics
toptica_BR_laboratory_electronics.pdf
Brochure: Tunable Diode Lasers (6 MB)
toptica_BR_product_catalog.pdf
Article: 12 Orders of Coherence Control
toptica_AP_1010_coherence_control_2010.pdf