Credo

HIGH REPETITION RATE

The Credo high repetition rate systems build upon the designs of the popular Cobra pulsed dye laser series. German engineered by our partner firm Sirah GmbH for The Credo Advantage precision, stability, and reliability, the Credo dye laser system has a resonator optimized

• Wide tunable wavelength for low energy, high repetition rate pumping. The Credo system can have an optional coverage from 370 nm to 900 nm1 built-in pump laser or optional doubling resulting in a sophisticated and compact • Built-in optional doubler for system-ideal for laser induced (LIF) and combustion studies. wavelength coverage into the DUV • Built-in optional amplifier for pulse The Credo-YHP model is configured with a built-in Spectra-Physics Navigator™ 532-9 energies of up to 3.3 mJ2 pump laser integrated into the laser box, resulting in assured alignment, smaller • Compact all-in-one box operation footprint and portability. with the Credo-YHP model • User-friendly open source LabView® enabled software The Credo systems offer: • Top mount adjusters for easy alignment. The top cover simply flips 1. 370–545 nm requires a 355 nm pump laser. 2. Requires external pump . up and the adjusters can be accessed from both sides of the laser.

• Optimized oscillator design to minimize pump thresholds, including cuvettes with Brewster angle windows, and a high efficiency grating-arm design.

• Newly designed high flow rate cuvettes for efficiently replenishing spent dye in the region. Special care was taken to remove any impediment to flow in order to provide the smoothest, fastest transfer of dye.

• Removable cuvettes for rapid dye changes. No need to flush out and clean the dye circulator system. The entire dye circulator system can be removed in seconds without tools and changed out for another autonomous system already filled with the dye for the next wavelength region of interest.

• With the optional integrated doubler, the Credo dye lasers offer coverage at popular wavelengths such as 283, 308 and 353 nm.

Reliability is inherent in the Credo system design. All of the Credo oscillator components are mounted on a solid block of low thermal expansion stainless steel, mechanically and thermally isolated from the outer laser housing. By removing Applications virtually all mechanical and thermal stress and by using opto-mechanics optimized ­• Laser induced fluorescence for easy and reproducible operation, Credo lasers achieve a wavelength resettability • Combustion and atmospheric studies for the oscillators of <5 pm, a limit set primarily by the laser’s spectral resolution. • Pump probe for chemical interaction research • Laser • CARS Credo

Credo-YHP Optical Layout

Beam Navigator 532-9 Pump Laser Shaping

Telescope Pellin-Broca cylindrical lenses Beam Grating Expander Doubling Compensator Crystal Brewster Dye Cell Tuning Optional Optional Amplifier Frequency Conversion Unit

Credo Dimensions

41.33 1.18 (1050) (30) 43.70 (1110) Side View

12.28 – 13.54 polarization (312) (344) 8.35 – 9.53 (212) (242)

18.23 11.89 9.25 (463) 37 (302) (235) 21.14 (537)

Rear View Dye Laser Output End

Dimensions in inches (mm) Dimensions in inch (mm)

www.spectra-physics.com Credo

Specifications Linewidth Specifications Dispersion Option Tuning Range Linewidth 1800 lines / mm, 90 mm 570–900 nm 0.08 cm-1 @ 595 nm 2400 lines / mm, 90 mm 545–750 nm 0.06 cm-1 @ 570 nm Output Characteristics Credo-YHP Absolute Wavelength Accuracy <30 pm Wavelength Resetability <5 pm Wavelength Stability <2 pm/°C Divergence (typical) 0.5 mrad Beam Size (typical) 0.8 mm (horizontal) x 2 mm (vertical) Polarization >98% (vertical) ASE <0.5% Repetition Rate 10 kHz Efficiency (570 nm)2 >15% SHG Efficiency (285 nm)2 >10% of fundamental Requirements Cooling for Dye Laser 300 W, resonator only Voltage 110–230 V, single phase, 50 Hz / 60 Hz Computer USB Operating System Windows XP / Windows Vista / Windows 7 1. Pulse duration shortest at the lowest repetition rates 2. After 100 kHz, efficiency straight line declines to 1.5% for R6G at 200 kHz

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