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Features & Applications

FEATURES

High brightness picosecond pulses at up to 1 kHz pulse repetition rate
Nearly Fourier-transform limited linewidth
Low divergence <2 mrad
Hands-free wavelength tuning
Tuning range from 193 nm to 16000 nm
Remote control via keypad
PC control using USB (RS232 is optional) and LabVIEW™ drivers

APPLICATIONS

Time resolved pump-probe spectroscopy
Laser-induced fluorescence
Infrared spectroscopy
Nonlinear spectroscopy: vibrational-SFG, surface-SH, CARS, Z-scan
Other laser spectroscopy applications

Description

PGx11 series optical parametric devices employ advanced design concepts in order to produce broadly tunable picosecond pulses with nearly Fourier-transform limited linewidth and low divergence. High brightness output beam makes the PGx11 series units an excellent choice for advanced spectroscopy applications.

Optical layout of PGx11 units consists of Synchronously pumped Optical Parametric Oscillator (SOPO) and Optical Parametric Amplifier (OPA). SOPO is pumped by a train of pulses at approx. 87 MHz pulse repetition rate. The output from SOPO consists of a train of pulses with excellent spatial and spectral characteristics, determined by the SOPO cavity parameters.

OPA is pumped by a single pulse temporally overlapped with SOPO output. After amplification at SOPO resonating wavelength, the PGx11 output represents a high intensity single pulse on top of a low-intensity train, while in all other spectral ranges (idler for PG411 and PG711, signal for PG511, also DFG stages) only a single high intensity pulse is present.

Microprocessor based control system provides automatic positioning of relevant components, allowing hands free operation. Nonlinear crystals, diffraction grating and filters are rotated by ultra-precise stepper motors in microstepping mode, with excellent reproducibility.

Precise nonlinear crystal temperature stabilization ensures long-term stability of generated wavelength and output power.

For customer convenience the system can be controlled using a user-friendly remote control pad or through USB interface (RS232 is optional) from a personal computer (PC) using supplied LabView™ drivers.

Available standard models are summarized in a Specifications table below. Please inquire for custom-built versions.

Available Models

Three models designed for pumping by up to the 3rd harmonic of Nd:YAG laser are available.

Model	Features
PG411	Model has a tuning range from 420 to 2300 nm and is optimized for providing highest pulse energy in the visible part of the spectrum. When combined with an optional Second Harmonic Generator (SHG) and Sum Frequency Generator (-DUV), it offers the widest possible tuning range – from 193 to 2300 nm.
PG511	Model has a tuning range from 725 to 2000 nm and highest pulse energy in near-IR spectral range. With an optional Difference Frequency Generator (DFG) the tuning range can be extended into the 2300 – 10000 nm range. PG411 and PG511 models are designed to be pumped by PL2250 series lasers with a 10 Hz pulse repetition rate.
PG711	Model has 1 kHz pulse repetition rate and uses DPSS mode‑locked laser of the PL2210 series for pumping. When pumped with pulses of 90 ps duration, linewidths of less than 1 cm⁻¹ were measured in the spectral range up to 16 µm, which makes this device an excellent choice for time-resolved or nonlinear infrared spectroscopy.

Specifications

Model	PG411	PG411‑SH	PG411‑SH‑DUV	PG511-DFG	PG711	PG711-DFG
OPA SPECIFICATIONS ¹⁾
Output wavelength tuning range
SH, DUV	–	210–420 nm	193–420 nm	–
Signal	420–709 nm			725–1000 nm	1550–2020 nm
Idler	710–2300 nm			1140–2000 nm	2250–3350 nm
DFG	–			2300–10000 nm	–	3350–16000 nm
Output pulse energy ²⁾
SH, DUV	–	100 µJ ³⁾	50 µJ ³⁾	–
Signal	700 µJ				500 µJ
Idler ⁴⁾	250 µJ				100 µJ
DFG	–					10 µJ ⁵⁾
Pulse repetition rate	10 Hz			10 Hz	1000 Hz
Linewidth	< 2 cm^-1 ⁶⁾			<2 cm^-1	< 0.5 cm^-1
Typical pulse duration ⁷⁾	15 ps			20 ps	70 ps
Scanning step
SH, DUV	–	0.01 nm		–
Signal	0.02 nm
Idler	0.1 nm
DFG	–					1 nm
Pulse contrast ⁸⁾	500 : 1				10⁶ : 1
Typical beam diameter ⁹⁾	~ 4 mm				~ 3 mm
Beam divergence ¹⁰⁾	< 2 mrad
Beam polarization ¹⁰⁾
SH, DUV	–	vertical		–
Signal	horizontal			vertical	horizontal
Idler	vertical			horizontal	vertical
DFG	–			horizontal	–	horizontal
PUMP LASER REQUIREMENTS
Recommended pump source	PL2251A + APL2100-TRAIN-H411			PL2251A + APL2100-TRAIN-H511	PL2210B-TR
Min. pump energy or power ¹¹⁾
at 1064 nm	–		2 mJ	(10 mJ)	5W (2.5 mJ)
at 532 nm	–			5 mJ (8 mJ)	–
at 355 nm	5 mJ (10 mJ)			–
Pulse duration ¹²⁾	30 ps				90 ps
Bream polarization at pump wavelength	vertical			horizontal
Beam size ¹³⁾	7 mm				2.5 mm
Beam divergence	< 0.5 mrad
Beam profile	homogeneous, without hot spots
PHYSICAL CHARACTERISTICS
Size (W x L x H)	456 × 1026 × 244 mm	456 × 1226 × 244 mm			456 × 1026 × 244 mm	456 × 1226 × 244 mm
OPERATING REQUIREMENTS
Room temperature	15 – 30 °C
Room temperature stability	± 2 °C
Power requirements	100 – 240 V single phase, 47 – 63 Hz
Power consumption	< 300 W

Due to continuous improvement, all specifications are subject to change without notice. Parameters marked typical are not specifications. They are indications of typical performance and will vary with each unit we manufacture. Unless stated otherwise, all specifications are measured at 450 nm for PG411 units, 800 nm for PG511 units, and 1620 nm for PG711 units.
Pulse energies are specified at selected wavelengths. See typical tuning curves for pulse energies at other wavelengths.
Measured at 280 nm for SH and 200 nm for DUV.
Measured at 1000 nm for PG411 units, 1620 nm for PG511, and 3000 nm for PG711 units.
Measured at 10000 nm.
<2 cm^-1 in signal (420 – 709 nm ), <3 cm^-1 for DUV and SH, <4 cm^-1 in idler (710 – 2300 nm).
Estimated FWHM assuming pump pulse duration 30 ps at 1064 nm for PG411 and PG511 units, and 90 ps at 1064 nm for PG711 units.
Ratio of intensity of single pulse with respect to residual pulse train. In SH or DFG ranges pulse contrast is better than 10⁶ : 1.
Beam diameter is measured at 1/e² level and can vary depending on the pump pulse energy.
Full angle measured at FWHM level.
The first number represents pulse train energy or power, while the value in brackets represents single pulse energy.
At FWHM level. Inquire for other available pulse duration options.
Beam diameter measured at 1/e² level.