US 12,438,325 B2
Method for generating gigahertz bursts of pulses and laser apparatus thereof
Andrejus Michailovas, Vilnius (LT); and Tadas Bartulevičius, Vilnius (LT)
Assigned to UAB ,,EKSPLA″, Vilnius (LT)
Appl. No. 17/763,407
Filed by UAB ,,EKSPLA″, Vilnius (LT)
PCT Filed Sep. 26, 2019, PCT No. PCT/IB2019/058167
§ 371(c)(1), (2) Date Mar. 24, 2022,
PCT Pub. No. WO2021/059003, PCT Pub. Date Apr. 1, 2021.
Prior Publication US 2022/0337017 A1, Oct. 20, 2022
Int. Cl. H01S 3/30 (2006.01); H01S 3/00 (2006.01); H01S 3/067 (2006.01); H01S 3/23 (2006.01); H01S 5/065 (2006.01); H01S 3/10 (2006.01)
CPC H01S 3/0057 (2013.01) [H01S 3/06725 (2013.01); H01S 3/2308 (2013.01); H01S 5/0656 (2013.01); H01S 3/06754 (2013.01); H01S 3/10084 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for generating bursts of laser pulses from a primary pulse train, comprising delaying a part of an input pulse with respect to another part of the input pulse, wherein sets of undelayed and delayed parts of many input pulses form bursts of output pulses,
wherein
a time delay (T2) of the delayed part with respect to the undelayed part of the input pulse is longer than a time period (T1) between said input pulse and the next input pulse;
said bursts of output pulses have an incrementally increasing number of pulses; an intra-burst pulse separation (T3) inside the formed bursts is equal to T3=T2−T1 and corresponds to an ultra-high pulse repetition rate higher than 100 MHz,
wherein
a delay line for delaying parts of input pulses is incorporated into an optical chain with an element with two input ports and two output ports:
the first output port is connected with a first input port via said delay line, the second input port receives input pulses of the primary pulse train,
the second output port delivers output train of bursts;
input pulses and their delayed parts received at the input ports are divided between the first and the second output ports with a certain splitting ratio;
parts of pulses are amplified during propagation in said delay line; and
parts of pulses propagating in the delay line are blocked under control of a drive signal (D2).